//【文件管理类 NSFileManager】
		NSError * error = nil;//0
        //ARC NSError __autorelease * error = nil;
        //1.查看指定目录里面的文件(浅度遍历)
        //第一个参数，要查看的文件夹路径
        //第二个参数，错误信息
        NSArray * fileContentsArray = [fm contentsOfDirectoryAtPath:PATH error:&error];
        //操作文件，一定要有错误信息的判断，如果文件操作失败，没有做处理，后面的程序100%挂掉
        if (error) {
            //perror 打印错误信息
            perror("contentsOfDirectoryAtPath");
        }
		//2.查看所有在这个文件夹下的文件(深度遍历)
        //第一个参数，要查看的文件夹路径
        //第二个参数，错误信息
        NSArray * allFileContentsArray = [fm subpathsOfDirectoryAtPath:PATH 					error:&error];

		//第一个参数:要创建文件夹的路径 这个路径是带有要创建的文件夹名的
        //第二个参数:BOOL类型，控制，是否创建中间文件夹
        //If YES, this method creates any non-existent parent directories as part of 		creating the directory in path. If NO, this method fails if any of the 				intermediate parent directories does not exist. This method also fails if any 		of the intermediate path elements corresponds to a file and not a directory.
        //如果要创建的文件夹，含有中间路径，那么YES，表示如果没有这个中间路径，我们就连带中间路径一起创		建，如果存在，不用管它
        //第三个参数:属性，创建文件夹的属性 默认属性nil
        //第四个参数:错误信息
        //返回值BOOL 判断创建是否成功
        [fm createDirectoryAtPath:dstPath withIntermediateDirectories:YES 					attributes:nil error:&error];
 		//创建一个普通文件
        //第一个参数:路径,这个路径是带有所要创建的文件名
        //第二个参数:文件的内容，NSData 是OC当中二进制文件格式
        //第三个参数:属性，默认nil
        //利用他的返回值做出错判断
        //NSString  转 NSData
        NSString * str = @"今天赵雨铭同学，要给大家讲电子图书类!!!";
        NSData * data = [str dataUsingEncoding:NSUTF8StringEncoding];
        BOOL ret = [fm createFileAtPath:[PATH 												stringByAppendingPathComponent:@"1.txt"]contents:data attributes:nil];

		//删除文件夹 和 普通文件 是一个方法
        //删除是不可逆的~~~
        //第一个参数:路径是带有要删除的文件信息的
        //第二个参数:错误信息
        [fm removeItemAtPath:PATH error:&error];

		//copy文件
        //第一个参数:要复制的原路径，带有文件名 或者 文件夹名
        //第二个参数:目标路径  必须加上要复制过去的文件名,这个文件名可以重命名
        //第三个参数:error信息
        [fm copyItemAtPath:[PATH stringByAppendingPathComponent:@"MID/test"]toPath:			[PATH stringByAppendingPathComponent:@"test"] error:&error];


	 	//移动文件
        //第一个参数:要移动源文件路径
        //第二个参数:目标路径，也要带上文件名
        //第三个参数:error
        [fm moveItemAtPath:[PATH stringByAppendingPathComponent:@"1副本.txt"] toPath:		[PATH stringByAppendingPathComponent:@"1.txt"] error:&error];

		//判断文件是否存在
        //返回值BOOL YES 表示该文件存在，NO 表示该文件不存在
        BOOL ret = [fm fileExistsAtPath:[PATH 												stringByAppendingPathComponent:@"12.txt"]];
        if (ret) {
            NSLog(@"This file exist!");
        } else {
            NSLog(@"This file No exist!");
        }
        
        //判断这个文件是不是文件夹
        //返回值BOOL YES 表示这个路径的文件存在 NO 不存在
        //isDirectory 传入参数是一个BOOL *  YES 表示是一个文件夹，如果NO 表示是一个普通文件
        //- (BOOL)fileExistsAtPath:(NSString *)path isDirectory:(BOOL *)isDirectory;
        BOOL isDirectory = NO;
        ret = [fm fileExistsAtPath:[PATH stringByAppendingPathComponent:@"MIDd"] 			isDirectory:&isDirectory];
        
        if (ret) {
            if (isDirectory) {
                NSLog(@"This is a directory!");
            } else {
                NSLog(@"This is normal file!");
            }
        } else {
            NSLog(@"No such file or directory!");
        }
        
        //获取文件的属性
        NSDictionary * dic = [fm attributesOfItemAtPath:PATH error:&error];
        NSLog(@"%@",dic);
//      {
//        NSFileCreationDate = "2015-12-30 01:40:30 +0000";
//        NSFileExtensionHidden = 0;
//        NSFileGroupOwnerAccountID = 20;
//        NSFileGroupOwnerAccountName = staff;
//        NSFileModificationDate = "2015-12-30 03:27:14 +0000";
//        NSFileOwnerAccountID = 501;
//        NSFileOwnerAccountName = LXL;
//        NSFilePosixPermissions = 493;
//        NSFileReferenceCount = 12;
//        NSFileSize = 408;
//        NSFileSystemFileNumber = 3450634;
//        NSFileSystemNumber = 16777220;
//        NSFileType = NSFileTypeDirectory;
//      }

	
【文件句柄类 NSFileHandle】
        //创建一个读取文件的句柄
        NSFileHandle * fhForRead = [NSFileHandle fileHandleForReadingAtPath:PATH];
		//创建一个用于写入文件的句柄
        NSFileHandle * fhForWrite = [NSFileHandle fileHandleForWritingAtPath:PATH];
		//创建一个读写句柄
        NSFileHandle * fhForUpdating = [NSFileHandle fileHandleForUpdatingAtPath:PATH];
		
		//读取数据，读取的数据是一个二进制数据
        //这个读取文件的方式是要把文件全部读取到内存中去
        //在iOS程序中，都是采用这样的读取文件方式
        NSData * data = [fhForRead readDataToEndOfFile]; //EOF
		//读取指定长度的文件，字节数
		[fhForUpdating readDataOfLength:9];

		//写入数据是一个覆盖写
        [fhForWrite writeData:dataForWrite];
		//文件指示器到文件的末尾
        [fhForWrite seekToEndOfFile];
        //文件指示器，到文件的指定位置，这个位置是一个字节数
        [fhForWrite seekToFileOffset:<#(unsigned long long)#>]
		//把文件截短成100
        [fhForUpdating truncateFileAtOffset:10];


//【plist文件】 Property List
//在plist文件当中，只能保存一下几种数据NSString NSDate NSData NSNumber NSArray NSDictionary
//plist是一个可视化轻量级文件，通常是保存一下数据量不是太大的文件，QQ登陆信息
//XML文本
//数据对象NSArray NSDictionary

				//1.创建一个plist文件
        //第一个参数:代表要创建plist的路径，包括plist文件名
        //第二个参数:表示是否要原子操作
        [dict1 writeToFile:[PATH stringByAppendingPathComponent:@"dict.plist"] atomically:NO];
        
        [array writeToFile:[PATH stringByAppendingPathComponent:@"array.plist"] atomically:NO];


[file] - > [new] - >[file] - > [OS X] - > [Property List]

//2.读取plist
  NSArray * plistArray = [[NSArray alloc] initWithContentsOfFile:PATH];
 NSURL * url = [[NSURL alloc] initWithString:URL];
        NSDictionary * dict = [[NSDictionary alloc] initWithContentsOfURL:url];

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    //初始化window，并设置fram
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    //[UIScreen mainScreen].bounds] 获取当前屏幕的大小
    
    //设置背景颜色
    [self.window setBackgroundColor:[UIColor purpleColor]];
    
    //Xcode 7.0 之后，必须有rootViewController
    //Xcode 7.0 之前，可以不设置rootViewController
    RootViewController * rootVC = [[RootViewController alloc]init];
    self.window.rootViewController = rootVC;
    //设置window为 keyWindow 并显示
    [self.window makeKeyAndVisible];
    

    return YES;
}
@implementation RootViewController
//视图已经加载
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    //[self createUILabel];
    //[self  createNewLabel];
  //UILabel * label =(UILabel *)[self.view viewWithTag:9];
   // label.text = @"123";
    
}

-(void)createUILabel{
    
    //红50绿100蓝30
    //alpha 透明度，默认是1.0，取值范围0~1.0
    //利用RGB生成一个颜色
    //UIColor *color = [UIColor colorWithRed:50/255.0 green:100/255.0 blue:30/255.0 alpha:0.8];
    
    //设置self.view的背景色
    self.view.backgroundColor = [UIColor whiteColor];
    //CGRect rect = CGRectMake(50, 50, 100, 100);
    
    //初始化UILbel 并设置fram
    //重新设置fram，会把之前设置的fram覆盖
    UILabel * label = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];
    
    //设置label的背景色
    label.backgroundColor = [UIColor lightGrayColor];
    label.text = @"NSLineBreakByTruncatingTail,	    NSLineBreakByTruncatingMiddleNSLineBreakByTruncatingTail,NSLineBreakByTruncating ,MiddleNSLineBreakByTruncatingTail.NSLineBreakByTruncatingMiddleNSLineBreakByTruncatingTail,NSLineBreakByTruncatingMiddle";
    
    //设置字体的类型和大小
    label.font = [UIFont systemFontOfSize:20];
    
    //设置粗体
    label.font = [UIFont boldSystemFontOfSize:20];
    
    //设置斜体（不支持中文）
    label.font = [UIFont italicSystemFontOfSize:20];
    
    //获取所有字体
    NSLog(@"%@",[UIFont familyNames]);
   
    //设置字体，大小
    label.font = [UIFont fontWithName:@"Thonburi" size:20];
    
    //自适应宽度
    //label.adjustsFontSizeToFitWidth = YES;
    //内容对其方式
    label.textAlignment = NSTextAlignmentLeft;
    
    //label.textAlignment = NSTextAlignmentRight;
    //label.textAlignment = NSTextAlignmentCenter;
    
    //限制设置行数，如果文字不够，能显示多少行就显示多少行。
    //如果行高不够，能显示多少行就显示多少行。
    //默认值是0，表示行数最大
    label.numberOfLines = 0;
    
    label.lineBreakMode = NSLineBreakByTruncatingMiddle;
//    NSLineBreakByWordWrapping = 0,  根据单词截断
//    NSLineBreakByCharWrapping,      根据字符截断
//    NSLineBreakByClipping,          简单截断
//    NSLineBreakByTruncatingHead,    省略号在前
//    NSLineBreakByTruncatingTail,    省略号在后
//    NSLineBreakByTruncatingMiddle   省略号在中
    
    label.shadowColor = [UIColor blueColor];
    label.shadowOffset = CGSizeMake(3, 3);
    //设置透明度
    label.alpha = 0.8;
    //标识
    label.tag = 10;
    
    [self.view addSubview:label];
    
}

#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];

//    [self createUIImageView];
    [self UIImageViewAnimation];
}

-(void)UIImageViewAnimation{
    UIImageView *bgView = [[UIImageView alloc]initWithFrame:self.view.bounds];
    bgView.image = [UIImage imageNamed:@"back2.jpg"];
    [self.view addSubview:bgView];
    
    UIImageView *birdView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 121, 96)];
    birdView.image = [UIImage imageNamed:@"DOVE 1"];
    
    NSMutableArray *mArray = [NSMutableArray array];
    for (int i = 1 ; i <19; i ++) {
        NSString *PicName = [NSString stringWithFormat:@"DOVE %d",i];
        UIImage *image = [UIImage imageNamed:PicName];
        [mArray addObject:image];
    }
    
    birdView.animationImages = mArray;
    birdView.animationDuration = 1;
    birdView.animationRepeatCount = 2;
    [birdView startAnimating];
    
    [self.view addSubview:birdView];
    
}

//创建UIImageView
-(void)createUIImageView{
    /*
    UIImageView *imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"back2.jpg"]];
    [self.view addSubview:imageView];
     */
    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(50, 50, 200, 200)];
    imageView.backgroundColor = [UIColor lightGrayColor];
    imageView.image = [UIImage imageNamed:@"back2.jpg"];
    imageView.contentMode = UIViewContentModeScaleAspectFill;
//    UIViewContentModeScaleToFill
//    UIViewContentModeScaleAspectFit
//    UIViewContentModeScaleAspectFill
    [self.view addSubview:imageView];
    

    
//UIImage在初始化图片时，能获得图片的size
    UIImage *image = [UIImage imageNamed:@"back2.jpg"];
    NSLog(@"%f----%f",image.size.width,image.size.height);
}

@end

#import "ViewController.h"

@interface ViewController ()<UIAlertViewDelegate>
{
    int number;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    
}
//点击屏幕就会触发此方法
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    number = arc4random()%2;
    NSLog(@"number = %d",number);
    if (number == 0) {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"提示" message:@"赶快还钱" delegate:self cancelButtonTitle:@"还钱" otherButtonTitles:@"不还",@"就不还", nil];
        [alert show];
    }
    if (number == 1) {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"提示" message:@"还钱" delegate:self cancelButtonTitle:@"还钱" otherButtonTitles:@"不还",@"就不还", nil];
        
        
        alert.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput;
        
        [alert show];
        
//        UIAlertViewStyleDefault = 0,
//        UIAlertViewStyleSecureTextInput,
//        UIAlertViewStylePlainTextInput,
//        UIAlertViewStyleLoginAndPasswordInput
    }
}
#pragma mark -
#pragma mark delegate
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (number == 0) {
        switch (buttonIndex) {
            case 0:
                NSLog(@"%ld",buttonIndex);
                break;
            case 1:
                NSLog(@"%ld",buttonIndex);
                break;
            case 2:
                NSLog(@"%ld",buttonIndex);
                break;
                
            default:
                break;
        }

    }else{

        switch (buttonIndex) {
            case 0:
                NSLog(@"%ld",buttonIndex);        NSLog(@"%@",[[alertView textFieldAtIndex:0]text]);
                NSLog(@"%@",[[alertView textFieldAtIndex:1]text]);
                break;
            case 1:
                NSLog(@"%ld",buttonIndex);
                break;
            case 2:
                NSLog(@"%ld",buttonIndex);
                break;
                
            default:
                break;
        }
    }
    
    
}
@end

#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

#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

#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

#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