触摸UITouches

 

// 一个完整的触摸过程:touchesBegan -> touchesMoved -> touchesEnded

 

/**

 *  触摸开始(手指刚碰到view)

 */

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

//    event.type

    

    // 随机取一个对象

//    UITouch *touch = [touches anyObject];

//

//    NSLog(@"touchesBegan--%d", touches.count);

    

//    NSLog(@"%d", touch.tapCount);

}

 

/**

 *  触摸ing(手指在view上面挪来挪去)

 */

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

{

    UITouch *touch = [touches anyObject];

    

    // 当前触摸点

    CGPoint current = [touch locationInView:self];

    // 上一个触摸点

    CGPoint previous = [touch previousLocationInView:self];

    

    // 修改当前view的位置(中点)

    CGPoint center = self.center;

    center.x += current.x - previous.x;

    center.y += current.y - previous.y;

    self.center = center;

}

 

/**

 *  触摸结束(手指离开view)

 */

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event

{

//    UITouch *touch = [touches anyObject];

//    NSLog(@"touchesEnded--%d", touches.count);

}