UI一揽子计划 4 （Touch 、摇一摇、响应者链)

一、touch

- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event //开始触摸，就只被执行一次

{

 //  NSLog(@"开始触摸.");
   /**
     *  2015-08-26 10:32:10.933 LessonUITouch[1650:58351]
     <UITouch: 0x7fac30f8f230>
     phase: Began tap count: 1
     window: <UIWindow: 0x7fac30f905b0;
        frame = (0 0; 375 667);
        gestureRecognizers = <NSArray: 0x7fac30f91800>;
        layer = <UIWindowLayer: 0x7fac30f90540>
     >
     view: <TouchView: 0x7fac30f948a0;
        frame = (100 100; 100 100);
        layer = <CALayer: 0x7fac30f8f040>
     >
    

--<<<<<<<<<<------------------下面的信息相对重要-------->>>>>>>>>>>-

    
     location in window: {121.5, 158.5}     // 当前光标在window上的位置
     previous location in window: {121.5, 158.5}  //拖拽前上一个点的位置 相对于window
     location in view: {21.5, 58.5}  //当前光标在touchView上的位置
     previous location in view: {21.5, 58.5} //拖拽前上一个点的位置 相对于touchView
     */
   //保存了触摸时候手指的信息
   UITouch*touch = [touchesanyObject];
  // NSLog(@"%@", touch);
   //取出一个点
   CGPointp1 = [touchlocationInView:self];
   self.startPoint= p1;
 //  CGPoint p2 = [touch previousLocationInView:self];
  // NSLog(@"%@", NSStringFromCGPoint(p2));
 //  NSLog(@"%@", NSStringFromCGPoint(p1));
   self.backgroundColor= [UIColorcolorWithRed:arc4random()%256/255.0green:arc4random()%256/255.0blue:arc4random()%256/255.0alpha:1.000];
   
}

- (void)touchesCancelled:(NSSet*)touches withEvent:(UIEvent*)event
{
   NSLog(@"扫兴，抚摸中断了...");
}
- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event
{
   UITouch*touch = [touchesanyObject];
   CGPointending = [touchlocationInView:self];
   CGFloatdx = ending.x-self.startPoint.x;
   if(dx >10) {
       NSLog(@"右滑");
    }elseif(dx < -10) {
       NSLog(@"左滑");
    }
   NSLog(@"%f", dx);
   NSLog(@"摸够了...");
}
- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
  // NSLog(@"抚摸中...");
   UITouch*touch = [touchesanyObject];
   CGPointp1 = [touchlocationInView:self];
   CGPointp2 = [touchpreviousLocationInView:self];
   //计算偏移的距离
   CGFloatdx = p1.x- p2.x;
   CGFloatdy = p1.y- p2.y;
   //原来中心点的坐标加上偏移量就得到了新的位置
 //  CGPoint p3 = {self.center.x + dx, self.center.y + dy};
 //   NSLog(@"%@", NSStringFromCGPoint(p2));
 //   NSLog(@"%@", NSStringFromCGPoint(p1));
 //self.center = p3;
  // self.backgroundColor = [UIColor colorWithRed:arc4random()%256/255.0 green:arc4random()%256/255.0 blue:arc4random()%256/255.0 alpha:1.000];

 }

二、摇一摇

加载视图 加载的是自带的self.view

- (void)loadView
{
    [superloadView];//如果要重写这个方法，就必须要写这个方法。如果没有这个方法我们就不能使用它因为它是一个空的视图
}
- (void)viewDidLoad {
    [superviewDidLoad];
   self.view.backgroundColor= [UIColorcolorWithRed:0.315green:0.867blue:1.000alpha:1.000];
 
   // Do any additional setup after loading the view.
}

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent*)event
{
   NSLog(@"开始摇");
}
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent*)event
{
  // SecondViewController *sec = [[SecondViewController alloc]init];
   WeChatLoginViewController*weChat = [[WeChatLoginViewControlleralloc]init];
    [selfpresentViewController:weChatanimated:YEScompletion:nil];
    [weChatrelease];
   
   NSLog(@"摇完了");
}
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent*)event
{
   NSLog(@"取消");

}

三、响应者链

 /**
     * 响应者链
       响应者链分为两个过程(查找与响应)
            1.查找过程
               先找到是哪个应用程序->找是哪个window ->哪个控制器(页面) -> self.view  ->所有的子视图 找到为止
    
            2.响应过程
               如何才能处理事件？
                   能捕捉到点击事件，即实现了touchBegan等方法
                   看所有子视图能不能处理  -> self.view ->所在控制器->所在window ->所属应用程序
                   如果没有视图处理这个事件，那么这个点击事件就被遗弃
     */
   //阻断了查询的过程，不让进行查询的过程，都不会走到响应的步骤。
   //直译：用户交互影响授权 系统默认是NO（阻断查询过程（把交互关闭））/  YES(不阻断查询过程(把交互打开))
   self.window.userInteractionEnabled=YES;
   WeChatLoginViewController*rootVC = [[WeChatLoginViewControlleralloc]init];
   self.window.rootViewController= rootVC;

    [rootVC release];

1. 姚贝娜的照片。

     UIImageView *imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"123.jpg" ]];
     imageView.frame = CGRectMake(0, 0, 375, 667);
     [self.window addSubview:imageView];
     [imageView release];
     UIButton *button1 = [UIButton buttonWithType:(UIButtonTypeCustom)];
     [button1 addTarget:self action:@selector(action:) forControlEvents:(UIControlEventTouchUpInside)];
     [button1 setTitle:@"点我" forState:(UIControlStateNormal)];
     [button1 setTitle:@"点我" forState:(UIControlStateHighlighted)];
     [button1 setTitleColor:[UIColor redColor] forState:(UIControlStateHighlighted)];
     button1.frame = CGRectMake(70, 180, 200, 200);
     [imageView addSubview:button1];
     imageView.userInteractionEnabled = YES;