分类：Objective-C - 飞羽的博客

图片加载方式(Objc)

飞羽

Objective-C

发布于：2017年2月24日

路径解析

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    UIImage *image = [UIImage imageNamed:@""];
       //  使用`imageNamed:`初始化的时候，会先检查缓存中是否存在要加载的照片，如不存在，图片首先会被缓存起来，然后才返回要加载的图片对象；如果存在，直接返回要加载的照片对象。
    
    NSString *path = [[NSBundle mainBundle]pathForResource:@"1.png" ofType:nil];
    NSLog(@"%@",path);
    UIImage *image2 = [UIImage imageWithContentsOfFile:path];
    //  使用`imageWithContentsOfFile:`创建图片的时候，是直接从磁盘上加载。当收到内存警告时，图片对象会被释放，下一次绘图的时候，需要重新加载。
    
    NSData *data;
    UIImage *image3 = [UIImage imageWithData:data];
    //  data 是照片数据，一般是请求返回的，然后通过`imageWithData:`创建图片。
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
@end

沙盒路径(Objc)

飞羽

Objective-C

发布于：2017年2月23日

沙盒路径

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
//    数据是写在Library->Preferences下
    NSUserDefaults *defaults1 = [NSUserDefaults standardUserDefaults];
    NSLog(@"%p",defaults1);
    NSUserDefaults *defaults2 = [NSUserDefaults standardUserDefaults];
    NSLog(@"%p",defaults2);
    
    NSUserDefaults *defaults3 = [[NSUserDefaults alloc]init];
    NSLog(@"%p",defaults3);
    
    NSArray *tempArray = @[@"1",@"2"];
    [defaults1 setObject:tempArray forKey:@"array"];
    
//  1、获取程序的Home目录
//    NSString *homeDirectory = NSHomeDirectory();
//    NSLog(@"path:%@", homeDirectory);
    
//    2、获取document目录
//    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//    NSString *documentPath = [documentPaths objectAtIndex:0];
//    NSLog(@"path:%@", documentPath);
    
//    3、获取Cache目录    
//    NSArray *CachePaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
//    NSString *CachePath = [CachePaths objectAtIndex:0];
//    NSLog(@"%@", CachePath);
    
//    4、获取Library目录
//    NSArray *LibraryPaths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
//    NSString *LibraryPath = [LibraryPaths objectAtIndex:0];
//    NSLog(@"%@", LibraryPath);
    
//    5、获取Tmp目录
//    NSString *tmpDir = NSTemporaryDirectory();
//    NSLog(@"%@", tmpDir);
    
//    6、写入文件
//    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//    NSString *docDir = [paths objectAtIndex:0];
//    NSLog(@"%@",docDir);
//    if (!docDir) {
//        NSLog(@"Documents 目录未找到");
//    }
//    NSArray *contentArray = [[NSArray alloc] initWithObjects:@"内容",@"content",nil];
//    NSString *filePath = [docDir stringByAppendingPathComponent:@"testFile.txt"];
//    [contentArray writeToFile:filePath atomically:YES];
    
    
//    7、读取文件
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docDir = [paths objectAtIndex:0];
    NSString *filePath = [docDir stringByAppendingPathComponent:@"testFile.txt"];
    NSLog(@"%@",filePath);
    NSArray *array = [[NSArray alloc]initWithContentsOfFile:filePath];
    NSLog(@"%@", array);
    
    
//    8、判断一个文件是否存在,传入全路径(fileExistsAtPath)
//    // 创建文件管理器
//    NSFileManager * fileManager = [NSFileManager defaultManager];
//    
//    NSString * documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
//    NSString * filePath = [documents stringByAppendingPathComponent:@"test"];
//    
//    // 判断一个文件是否存在,传入全路径
//    if ([fileManager fileExistsAtPath:filePath]) {
//        NSLog(@"it is exit");
//    }
    
    
//    9、在Documents里创建目录
//    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//    NSString *documentsDirectory = [paths objectAtIndex:0];
//    NSLog(@"documentsDirectory%@",documentsDirectory);
//    NSFileManager *fileManager = [NSFileManager defaultManager];
//    NSString *testDirectory = [documentsDirectory stringByAppendingPathComponent:@"test"];
//    // 创建目录
//    [fileManager createDirectoryAtPath:testDirectory withIntermediateDirectories:YES attributes:nil error:nil];
    
    
//    10、在目录下创建文件
//    NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test00.txt"];
//    NSString *testPath2 = [testDirectory stringByAppendingPathComponent:@"test22.txt"];
//    NSString *testPath3 = [testDirectory stringByAppendingPathComponent:@"test33.txt"];
//    NSString *string = @"写入内容，write String";
//    [fileManager createFileAtPath:testPath contents:[string  dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];
//    [fileManager createFileAtPath:testPath2 contents:[string  dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];
//    [fileManager createFileAtPath:testPath3 contents:[string  dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];
    
    
//    11、获取目录列里所有文件名
//    两种方法获取：subpathsOfDirectoryAtPath 和subpathsAtPath
//    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//    NSString *documentsDirectory = [paths objectAtIndex:0];
//    NSLog(@"documentsDirectory%@",documentsDirectory);
//    NSFileManager *fileManage = [NSFileManager defaultManager];
//    NSString *myDirectory = [documentsDirectory stringByAppendingPathComponent:@"test"];
//    NSArray *file = [fileManage subpathsOfDirectoryAtPath: myDirectory error:nil];
//    NSLog(@"%@",file);
//    NSArray *files = [fileManage subpathsAtPath: myDirectory ];
//    NSLog(@"%@",files);
    
    
//    12、fileManager使用操作当前目录    
//    //创建文件管理器
//    NSFileManager *fileManager = [NSFileManager defaultManager];
//    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//    NSString *documentsDirectory = [paths objectAtIndex:0];
//    //更改到待操作的目录下
//    [fileManager changeCurrentDirectoryPath:[documentsDirectory stringByExpandingTildeInPath]];
//    //创建文件fileName文件名称，contents文件的内容，如果开始没有内容可以设置为nil，attributes文件的属性，初始为nil
//    NSString * fileName = @"testFileNSFileManager.txt";
//    NSArray *array = [[NSArray alloc] initWithObjects:@"hello world",@"hello world1", @"hello world2",nil];
//    [fileManager createFileAtPath:fileName contents:array attributes:nil];  
    
//    13、删除文件    
//    [fileManager removeItemAtPath:fileName error:nil];
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

UIAlertController(Objc)

飞羽

Objective-C

发布于：2017年2月23日

UIAlertController


#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    for (int i = 0 ; i < 2; i ++) {
        UIButton *button =[UIButton buttonWithType:UIButtonTypeCustom];
        button.frame = CGRectMake(120 + i * 120, 120, 100, 50);
        button.backgroundColor = [UIColor lightGrayColor];
        if (i == 0) {
            [button setTitle:@"alertView" forState:UIControlStateNormal];
        }else{
            [button setTitle:@"actionSheet" forState:UIControlStateNormal];
        }
        button.tag = 10 + i ;
        [button addTarget:self action:@selector(onClick:) forControlEvents:UIControlEventTouchUpInside];
        
        [self.view addSubview:button];
    }
    
}
-(void)onClick:(UIButton*)button{
    
    if (button.tag == 10) {
        NSLog(@"alertView");
        [self alertView];
    }else{
        NSLog(@"actionSheet");
        [self actionSheet];
    }
}
-(void)actionSheet{
//    初始化UIAlertCOntroller
//    Title:标题
//    message:信息
//    Style:样式
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"message" preferredStyle:UIAlertControllerStyleActionSheet];
    
//    初始化UIAlertAction
    UIAlertAction *cancelBtn = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *  action) {
        NSLog(@"取消");
    }];
    
    UIAlertAction *firstBtn = [UIAlertAction actionWithTitle:@"first" style:UIAlertActionStyleDefault handler:^(UIAlertAction * action) {
        NSLog(@"取消");
    }];
    
    
    
    [alertController addAction:cancelBtn];
    [alertController addAction:firstBtn];
    [self presentViewController:alertController animated:YES completion:nil];
    
}
-(void)alertView{
//    初始化UIAlertController
//    Title:标题
//    message:信息
//    Style:样式
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"message" preferredStyle:UIAlertControllerStyleAlert];
//    UIAlertControllerStyleActionSheet
//    UIAlertControllerStyleAlert
    
//    初始化按钮
//    Title：标题
//    style：样式
//    UIAlertController 上面只能有一个取消样式的按钮，否则会崩溃
    UIAlertAction *cancelBtn = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *  action) {
        NSLog(@"取消");
    }];
//    UIAlertActionStyleDefault = 0,普通按钮
//    UIAlertActionStyleCancel,取消按钮
//    UIAlertActionStyleDestructive重置、销毁

//    添加文本输入框
    [alertController addTextFieldWithConfigurationHandler:^(UITextField *  textField) {
        textField.placeholder = @"请输入";
    }];
    
    [alertController addTextFieldWithConfigurationHandler:^(UITextField * textField) {
        textField.placeholder = @"第二个文本输入框";
    }];
    
    UIAlertAction *resetBtn = [UIAlertAction actionWithTitle:@"reset" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *  action) {
        
        UITextField *textField1 = alertController.textFields[0];
        NSLog(@"%@",textField1.text);
        
        UITextField *textField2 = alertController.textFields[1];
        NSLog(@"%@",textField2.text);
    }];
    
    
//    添加动作
    [alertController addAction:cancelBtn];
    [alertController addAction:resetBtn];
    
    
//    模态
    [self presentViewController:alertController animated:YES completion:nil];
}
@end

UIActivityIndicatorView(Objc)

飞羽

Objective-C

发布于：2017年2月22日

UIActivityIndicatorView

#import "myButton.h"

@implementation myButton

+(UIButton *)buttonWithFrame:(CGRect)frame BGColor:(UIColor *)color Title:(NSString *)title NormalImage:(UIImage *)normalImage Tag:(int)tag Method:(SEL)method Object:(id)object{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = frame;
    button.backgroundColor = color;
    [button setTitle:title forState:UIControlStateNormal];
    button.tag = tag;
    [button setBackgroundImage:normalImage forState:UIControlStateNormal];
    [button addTarget:object action:method forControlEvents:UIControlEventTouchUpInside];
    return button;
}

@end


#import "ViewController.h"
#import "myButton.h"
@interface ViewController ()
{
    UIActivityIndicatorView *act;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    
    [self createBtn];
    [self createActivityIndicatorView];
}
-(void)onClick:(UIButton*)button{
    if (act.isAnimating == YES) {
        [act stopAnimating];
    }else if(act.isAnimating == NO){
        [act startAnimating];
    }
    
}
-(void)createActivityIndicatorView{
    
//    UIActivityIndicatorViewStyleWhiteLarge,大白
//    UIActivityIndicatorViewStyleWhite,白色
//    UIActivityIndicatorViewStyleGray 灰色
//    初始化并设置样式
    act = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    act.frame = CGRectMake(100, 300, 50, 50);
//    设置中心点为屏幕中心点
    act.center = self.view.center;
    [self.view addSubview:act];
    
    act.backgroundColor = [UIColor redColor];
    
//    设置变大4倍
    act.transform = CGAffineTransformMakeScale(4, 4);
    
    act.tag = 10;
//    停止时是否隐藏，默认是YES
    act.hidesWhenStopped = YES;
}
-(void)createBtn{
    UIButton *startBtn = [myButton buttonWithFrame:CGRectMake(100, 100, 50, 50) BGColor:[UIColor lightGrayColor] Title:@"开始" NormalImage:nil Tag:10 Method:@selector(onClick:) Object:self];
    
    [self.view addSubview:startBtn];
    
    UIButton *endBtn = [myButton buttonWithFrame:CGRectMake(180, 100, 50, 50) BGColor:[UIColor lightGrayColor] Title:@"停止" NormalImage:nil Tag:11 Method:@selector(onClick:) Object:self];
    [self.view addSubview:endBtn];
    
    [self.view setBackgroundColor:[UIColor yellowColor]];
}
@end

路径解析(Objc)

飞羽

Objective-C

发布于：2017年2月18日

路径解析

#import "FyQuestion.h"

@implementation FyQuestion

// 判断是绝对路径: 以 /开头的就是绝对路径
//   -->./ios/day1/
//  -->/oc/day
- (BOOL)isAbsolutePath:(NSString *)path {
    //直接利用判断开头的这样的方法 harPrefix
    return [path hasPrefix:@"/"];
}

// 取得路径path最后的部分 /home/xuanmac ---> xuanmac, /home/xuanmac/1.txt--->1.txt
- (NSString *)lastPathComponent:(NSString *)path {
    //第一步，判断是否末尾存在/
    int flag = 0;
    NSString * subStr = nil;
    if ([path hasSuffix:@"/"]) {
        //截取字符方法，subStringToIndex
        subStr = [path substringToIndex:[path length] - 1];
        flag = 1;
    }
    
    //利用查找字符串方法，option 是倒序查找
    //查找方法，返回的是一个范围
    NSRange range = {0,0};
    if (flag) {
        //NSBackwardsSearch 倒序查找的指令
        range = [subStr rangeOfString:@"/" options:NSBackwardsSearch];
        //substringFromIndex 从指定位置到字符串结尾，包括指定位置
        return [subStr substringFromIndex:range.location + 1];
    } else {
        range = [path rangeOfString:@"/" options:NSBackwardsSearch];
        return [path substringFromIndex:range.location + 1];
    }
}

// 删除路径path最后的部分 /home/xuanmac/ ---> /home, /home/xuanmac/1.txt--->/home/xuanmac
- (NSString *)stringByDeletingLastPathComponent:(NSString *)path {
    
    NSString * subStr =  nil;
    //判断path末尾是不是以/结尾
    if ([path hasSuffix:@"/"]) {
        subStr = [path substringToIndex:path.length - 1];
    } else {
        subStr = path;
    }
    
    //倒序查找
    NSRange range = [subStr rangeOfString:@"/" options:NSBackwardsSearch];
    
    NSString * str = [subStr substringToIndex:range.location];
    
    return [NSString stringWithString:str];
    
}
// 在路径上追加路径/home/xuanmac/ 和 demo/abc-->/home/xuanmac/demo/abc
- (NSString *)stringByAppendingPathComponent:(NSString *)path withPath:(NSString *)subPath {
    NSMutableString * mStr = [NSMutableString stringWithString:path];
    //判断是否是以/结尾
    if ([mStr hasSuffix:@"/"]) {
        if ([subPath hasPrefix:@"/"]) {
            [mStr appendString:[subPath substringFromIndex:1]];
        } else {
            [mStr appendString:subPath];
        }
        
    } else {
        if ([subPath hasPrefix:@"/"]) {
            [mStr appendFormat:@"/%@",[subPath substringFromIndex:1]];
        } else {
            [mStr appendFormat:@"/%@",subPath];
        }
    }
    
    return [NSString stringWithString:mStr];
}

// 取得文件的扩展名/home/xuanmac/1.txt --> txt
- (NSString *)pathExtension:(NSString *)path {
#if 1
    //pathExtension 获取路径拓展名
    NSString * str = path.pathExtension;
    return [NSString stringWithString:str];
#else
    NSRange range = [path rangeOfString:@"." options:NSBackwardsSearch];
    NSString * str = [path substringFromIndex:range.location + 1];
    return [NSString stringWithString:str];
#endif
}

// 删除文件扩展名/home/xuanmac/1.txt --> /home/xuanmac/1
- (NSString *)stringByDeletingPathExtension:(NSString *)path {
    NSRange range = [path rangeOfString:@"." options:NSBackwardsSearch];
    
    NSString * str = [path substringToIndex:range.location];
    return [NSString stringWithString:str];
}
// 去除里面多余的 /路径  Duplicate重复 Slash表示斜线
// path = @"///home//xuanmac/ios/oc/day1/"; 返回@"/home/xuanmac/ios/oc/day1"
- (NSString *) removeDuplicateSlash:(NSString *)path {
#if 1
    //看到//我们就要处理掉一个，知道在path没有// NSNotFound
    //path 转换成可变字符串
    NSMutableString * mStr = [NSMutableString stringWithString:path];
    
    while (1) {
        NSRange range = [mStr rangeOfString:@"//"];
        //判断是否还存在，如果不存在@"//",跳出循环
        if (NSNotFound == range.location) {
            break;
        }
        //每次都删除//当中的一个
        [mStr deleteCharactersInRange:NSMakeRange(range.location, 1)];
    }
    
    //处理完//之后，我们要处理路径末尾的/
    if([mStr hasSuffix:@"/"])
    {
        [mStr deleteCharactersInRange:NSMakeRange(mStr.length - 1, 1)];
    }
    
    return [NSString stringWithString:mStr];
#else 
    NSArray * array = [path componentsSeparatedByString:@"/"];
    NSMutableArray * mArray = [NSMutableArray arrayWithArray:array];
    [mArray removeObject:@""];
    
    return [mArray componentsJoinedByString:@"/"];//?????
#endif
}
//-获取路径中的所有目录名---->/home/xuanmac/ios/oc --->home  xuanmac  ios   oc
- (NSArray *)pathComponents:(NSString*)path {
    return [path componentsSeparatedByString:@"/"];
}

+ (void)test {
    FyQuestion * test = [[FyQuestion alloc] init];
    NSLog(@"第一题");
    NSLog(@"%hhd",[test isAbsolutePath:@"./ios/day1/"]);
    NSLog(@"%hhd",[test isAbsolutePath:@"/ios/day1/"]);
    
    NSLog(@"第二题");
    NSString * str1 = [test lastPathComponent:@"/ios/day1/"];
    NSLog(@"%@",str1);
    NSString * str2 = [test lastPathComponent:@"/ios/day1/1.txt"];
    NSLog(@"%@",str2);
    
    NSLog(@"第三题");
    NSString * str3 = [test stringByDeletingLastPathComponent:@"/ios/day1/"];
    NSLog(@"%@",str3);
    NSString * str4 = [test stringByDeletingLastPathComponent:@"/ios/day1/1.txt"];
    NSLog(@"%@",str4);
    
    NSLog(@"第四题");
    NSString * str5 = [test stringByAppendingPathComponent:@"/ios/day1/" withPath:@"1.txt"];
    NSLog(@"%@",str5);
    NSString * str6 = [test stringByAppendingPathComponent:@"/ios/day1" withPath:@"/test/1.txt"];
    NSLog(@"%@",str6);
    
    NSLog(@"第五题");
    NSLog(@"%@",[test pathExtension:@"/test/1.txt"]);
    
    NSLog(@"第六题");
    NSLog(@"%@",[test stringByDeletingPathExtension:@"/test/1.txt"]);
    NSLog(@"第七题");
    NSLog(@"%@",[test removeDuplicateSlash:@"/////////fdjkasj//fdhk///fdjsalfkjs///"]);
    NSLog(@"第八题");
    
    NSLog(@"第备用题");
}


@end

UITextFieldDelegate

飞羽

Objective-C

发布于：2017年2月13日

#import "RootViewController.h"

@interface RootViewController ()<UITextFieldDelegate>

@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self createTextField];
}
//创建UITextField
-(void)createTextField{
//    初始化UITextField
    UITextField *textField = [[UITextField alloc]initWithFrame:CGRectMake(100, 400, 180, 50)];
//    设置背景色
    textField.backgroundColor = [UIColor yellowColor];
//    设置边框样式
    textField.borderStyle = UITextBorderStyleRoundedRect;
    
    
//    一键清除butotn
    textField.clearButtonMode = UITextFieldViewModeWhileEditing;
    
    textField.delegate = self;
    
//    添加到视图
    [self.view addSubview:textField];
}
#pragma mark - delegate

//点击return键，执行的方法
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
    NSLog(@"点击了return");
//    注销第一响应
    [textField resignFirstResponder];
    return YES;
}

//是否能进入编辑
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
    NSLog(@"将要开始编辑");
//    YES:可以进入编辑
//    NO:不能进入编辑
    return YES;
}
//当上面的方法返回YES的时候，才会调用此代理方法
-(void)textFieldDidBeginEditing:(UITextField *)textField{
    NSLog(@"已经开始编辑");
}
//将要结束编辑
-(BOOL)textFieldShouldEndEditing:(UITextField *)textField{
    NSLog(@"将要结束编辑");
    //    YES:可以结束编辑
    //    NO:不能结束编辑
    return YES;
}
//当上面的方法返回YES的时候，才会调用此代理方法
//已经结束编辑
-(void)textFieldDidEndEditing:(UITextField *)textField{
    NSLog(@"已经结束编辑");
}

//点击clearButton时调用的方法
-(BOOL)textFieldShouldClear:(UITextField *)textField{
//    当textField.text值是1的时候，不允许删除
    if ([textField.text isEqualToString:@"1"]) {
        return NO;
    }
//    YES:允许删除
//    NO:不允许删除
    return YES;
}

//获得每一次输入的字符
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    
//    NSLog(@"string = %@",string);
    
//    根据每次输入的字符，组成一个字符串
    NSMutableString *mutableString = [[NSMutableString alloc]initWithString:textField.text];
    [mutableString insertString:string atIndex:range.location];
    NSLog(@"%@",mutableString);
    
    return YES;
}
@end

View切换层级

飞羽

Objective-C

发布于：2017年2月12日

View切换层级

#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self createSubViews];
    
}

-(void)createSubViews{

    UILabel *redLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 10, 100, 100)];
    redLabel.backgroundColor = [UIColor redColor];
    redLabel.text = @"红色";
    [self.view addSubview:redLabel];
    
    UILabel *greenLabel = [[UILabel alloc]initWithFrame:CGRectMake(50, 50, 100, 100)];
    greenLabel.backgroundColor = [UIColor greenColor];
    greenLabel.text = @"绿色";
    [self.view addSubview:greenLabel];
    
    UILabel *blueLabel = [[UILabel alloc]initWithFrame:CGRectMake(80, 80, 100, 100)];
    blueLabel.backgroundColor = [UIColor blueColor];
    blueLabel.text = @"蓝色";
    [self.view addSubview:blueLabel];
    
//    把子视图提到最前面
//    [self.view bringSubviewToFront:redLabel];
    
//    把子视图放到最底层
//    [self.view sendSubviewToBack:blueLabel];
    
//    把某一个子视图放到第0层
//    [self.view insertSubview:blueLabel atIndex:0];
    
//    把blueLabel 放到greenLabel 下面
//    [self.view insertSubview:blueLabel belowSubview:greenLabel];
    
//    把blueLabel放置到redLabel 上面
//    [self.view insertSubview:redLabel aboveSubview:blueLabel];
    
    NSLog(@"subViews = %@",self.view.subviews);

}

@end

键盘状态监听(Objc)

飞羽

Objective-C

发布于：2017年2月10日

键盘状态监听

#import "RootViewController.h"

@interface RootViewController ()<UITextFieldDelegate>

@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIView *myView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];
    myView.backgroundColor = [UIColor blackColor];
    [self.view addSubview:myView];
    
    
    [self.view setBackgroundColor:[UIColor redColor]];
    
    [self createTextField];
}
-(void)createTextField{
//    初始化UITextField并设置frame
    UITextField *textField = [[UITextField alloc]initWithFrame:CGRectMake(100, 400, 100, 50)];
//    设置背景色
    textField.backgroundColor = [UIColor yellowColor];
    
    textField.delegate = self;
    
//    添加到视图
    [self.view addSubview:textField];
    
    
    //    键盘状态改变的时候，会发出以下通知
    //    UIKeyboardWillShowNotification; 键盘即将显示
    //    UIKeyboardDidShowNotification; 键盘显示完毕
    //    UIKeyboardWillHideNotification; 键盘即将消失
    //    UIKeyboardDidHideNotification;键盘消失完毕
    //    UIKeyboardWillChangeFrameNotification 键盘即将改变frame
    //    UIKeyboardDidChangeFrameNotification 键盘已经改变frame
    
//    获取通知中心
    NSNotificationCenter*center =  [NSNotificationCenter defaultCenter];
   
//  监听键盘弹出通知
    [center addObserver:self selector:@selector(KeyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
//    监听键盘收起通知
    [center addObserver:self selector:@selector(KeyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    
//    成为第一响应者
//    [textField becomeFirstResponder];
}

//键盘将要消失时
-(void)KeyboardWillHide:(NSNotification*)noti{
    NSLog(@"%@",noti.userInfo);
//    UIKeyboardAnimationDurationUserInfoKey = "0.25";
//    UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {375, 258}}";
//    UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 409}, {375, 258}}";
//    UIKeyboardFrameEndUserInfoKey = "NSRect: {{0,667}, {375, 258}}";
    
    
    self.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
}
//键盘将要出现
-(void)KeyboardWillShow:(NSNotification*)noti{
    NSLog(@"%@",noti.userInfo);
//    UIKeyboardAnimationDurationUserInfoKey = "0.25";
//    UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {375, 258}}";
//    UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 667}, {375, 258}}";
//    UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 409}, {375, 258}}";
//    UIKeyboardIsLocalUserInfoKey = 1;
    
    CGRect rect =  [noti.userInfo[UIKeyboardFrameEndUserInfoKey]CGRectValue];
    NSLog(@"rect = %@",NSStringFromCGRect(rect));
    
    
    self.view.frame  = CGRectMake(0, -rect.size.height, self.view.frame.size.width, self.view.frame.size.height);
}

#pragma mark - textField delegate
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
//    取消第一响应者
    [textField resignFirstResponder];
    return YES;
}
@end

手机晃动事件(Objc)

飞羽

Objective-C

发布于：2017年1月29日

手机晃动事件

#define screenWidth self.view.frame.size.width
#define screenHeight self.view.frame.size.height


#import "ViewController.h"

@interface ViewController ()
{
    UIImageView *_topImageView;
    UIImageView *_bottomImageView;
    UIImageView *_showImageView;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self createImageViews];
}
//检测到手机晃动
-(void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{
//    显示中间的图片
    [self showImageView];
    NSLog(@"晃动开始");
}
//晃动结束
-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{
//    隐藏中间的图片
    [self hideImageView];
    NSLog(@"晃动结束");
}

-(void)hideImageView{
    [UIView animateWithDuration:2 animations:^{
      //        设置返回原始位置
        _topImageView.frame = CGRectMake(0, 0, screenWidth, screenHeight/2);
        _bottomImageView.frame = CGRectMake(0, screenHeight/2, screenWidth, screenHeight/2);
    }];
}
-(void)showImageView{
//    使用动画为了更美观
    [UIView animateWithDuration:1 animations:^{
        
        _topImageView.frame = CGRectMake(0, -100, screenWidth, screenHeight/2);
        _bottomImageView.frame = CGRectMake(0, screenHeight/2 + 100, screenWidth, screenHeight/2);
    }];
}
#pragma mark 创建UI
-(void)createImageViews{
    
    _showImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 150, 150)];
    _showImageView.center = self.view.center;
    _showImageView.image = [UIImage imageNamed:@"ShakeHideImg_women"];
    [self.view addSubview:_showImageView];
    
    
    _topImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height/2)];
    _topImageView.image = [UIImage imageNamed:@"Shake_Logo_Up"];
    [self.view addSubview:_topImageView];
    
    _bottomImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height/2, self.view.frame.size.width, self.view.frame.size.height/2)];
    _bottomImageView.image = [UIImage imageNamed:@"Shake_Logo_Down"];
    [self.view addSubview:_bottomImageView];
}


@end

OC画图

飞羽

Objective-C

发布于：2017年1月27日

OC画图

#import "Customview.h"

@implementation Customview
{
    NSMutableArray *lineArray;
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self setBackgroundColor:[UIColor whiteColor]];
        
        UIButton *button=[UIButton buttonWithType:UIButtonTypeRoundedRect];
        [button setTitle:@"撤销" forState:UIControlStateNormal];
        [button addTarget:self action:@selector(doButton:) forControlEvents:UIControlEventTouchDown];
        button.frame=CGRectMake(110, 380, 100, 40);
        [button setBackgroundColor:[UIColor redColor]];
        [self addSubview:button];
        
        UIButton *button2=[UIButton buttonWithType:UIButtonTypeRoundedRect];
        [button2 setTitle:@"橡皮擦" forState:UIControlStateNormal];
        [button2 addTarget:self action:@selector(doButton:) forControlEvents:UIControlEventTouchDown];
        button2.frame=CGRectMake(110, 430, 100, 40);
        [button2 setBackgroundColor:[UIColor redColor]];
      
        [self addSubview:button2];

        //实例化数组（用来存放移动点的数组）
        lineArray =[[NSMutableArray alloc]init];
    }
    return self;
}

-(void)doButton:(id)button
{
    [lineArray removeLastObject];
    [self setNeedsDisplay];
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    //创建触摸事件对象
    UITouch *touch = [touches anyObject];
    //拿到初始点
    CGPoint firstPoint = [touch locationInView:self];
    //转换成value对象
    NSValue *value = [NSValue valueWithCGPoint:firstPoint];
    //创建存放每个点的内层数组（一条线）
    NSMutableArray *pointArray = [[NSMutableArray alloc]init];
    [pointArray addObject:value];
    //把每一笔画对应 的数组放入外层数组
    [lineArray addObject:pointArray];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
      //拿到移动 时的每一个点
    CGPoint currentPoint = [touch locationInView:self];
    //拿到最后笔画对应的数组
    NSMutableArray *pointAaary = [lineArray lastObject];
    NSValue *value = [NSValue valueWithCGPoint:currentPoint];
    //把移动 的每一个点放入对应的数组
    [pointAaary addObject:value];
    //让视图重绘（调用该方法后self的drawrect方法会被调用）
    [self setNeedsDisplay];

}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    
}
//iOS的绘图操作是在UIView类的drawRect方法中完成的，所以如果我们要想在一个UIView中绘图，需要写一个扩展UIView 的类，并重写drawRect方法，在这里进行绘图操作，程序会自动调用此方法进行绘图。
- (void)drawRect:(CGRect)rect
{
    //拿到当前绘图上下文环境
    CGContextRef currentText = UIGraphicsGetCurrentContext();
    //设置画笔线条的宽度
    CGContextSetLineWidth(currentText, 2);
    //将画笔设置为红色
    CGColorRef cf = [UIColor redColor].CGColor;
    CGContextSetStrokeColorWithColor(currentText, cf);
    
    for (int i = 0; i < [lineArray count]; i++) {
        //拿到每一个笔画对应的数组
       NSMutableArray *pArray = [lineArray objectAtIndex:i];
        for (int j = 0; j < [pArray count]-1; j++) {
            
            NSValue *previousValue = [pArray objectAtIndex:j];
            NSValue *currentValue = [pArray objectAtIndex:j+1];
            
            CGPoint previousPoint = [previousValue CGPointValue];
            CGPoint currentValuePoint = [currentValue CGPointValue];
            //设置画笔的起点
            CGContextMoveToPoint(currentText, previousPoint.x, previousPoint.y);
            //设置两点确定一条直线的另一点
            CGContextAddLineToPoint(currentText, currentValuePoint.x, currentValuePoint.y);
        }
        //提交描绘的轨迹，这才是真正画线的地方
        CGContextStrokePath(currentText);
    }
    
    
}
@end