#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

#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

#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

#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

#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

#import "RootViewController.h"
#import "SecondViewController.h"
@interface RootViewController ()<SecondViewControllerDelegate>

@end
@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    [self createButton];
}
-(void)createButton{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(100, 100, 100, 100);
    button.backgroundColor = [UIColor lightGrayColor];
    [button setTitle:@"下一页" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(onClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
}
-(void)onClick{
    SecondViewController *secondVc = [[SecondViewController alloc]init];
    secondVc.delegate = self;
    [self.navigationController pushViewController:secondVc animated:YES];
}

-(void)changeColor:(UIColor *)color{
    [self.view setBackgroundColor:color];
}

@end

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self createButton];
    
    [self.view setBackgroundColor:[UIColor lightGrayColor]];
}
-(void)createButton{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(100, 100, 100, 100);
    button.backgroundColor = [UIColor lightGrayColor];
    [button setTitle:@"上一页" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(onClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
}
-(void)onClick{
    if (self.delegate && [self.delegate respondsToSelector:@selector(changeColor:)]) {
        [self.delegate changeColor:[UIColor yellowColor]];
    }
    [self.navigationController popViewControllerAnimated:YES];
}
@end