• 在觸摸開始時(shí),調(diào)用 這個(gè)方法

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"touchesBegan");
    
    //手指在屏幕上每一次觸摸都會(huì)產(chǎn)生一個(gè)觸摸事件
    //這些事件會(huì)保存這個(gè)NSSet 類型的 touches里
    //我們可以取出這個(gè)事件
    UITouch * touch = [touches anyObject];
    [UIView animateWithDuration:0.3 animations:^{
        imageView.center = [touch locationInView:self.window];
    }];
    
    
    NSLog(@"window:%@",touch.window);
    NSLog(@"view:%@",touch.view);
    NSLog(@"phase:%id",touch.phase);
}

• 手指離開屏幕時(shí),觸發(fā)這個(gè)方法

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"touchesEnded");
    //可以在這里不使用任何一個(gè)事件,只去寫我們自己的方法

    [UIView animateWithDuration:0.3 animations:^{
        imageView.center = CGPointMake(160, 300);
    }];
    
}

• 手指在屏幕上移動(dòng)時(shí),觸發(fā)這個(gè)方法

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    //那么,手指只要在屏幕有偏移那么就調(diào)用一次這個(gè)方法
    NSLog(@"touchesMove");
    UITouch * touch = [touches anyObject];
    NSLog(@"view:%@",touch.view);
    if (touch.view == imageView && touch.phase == UITouchPhaseMoved) {
        imageView.center = [touch locationInView:self.window];
 }

• 觸摸被打斷時(shí)調(diào)用的方法

-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    //程序運(yùn)行過程中,進(jìn)來電話,短信,推送等優(yōu)先級(jí)比較高的事件
}