iOS触摸事件

触摸开始

// 当手指开始触摸view
// NSArray,字典，NSSet(无序)
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"%ld", touches.count);
    NSLog(@"%s",__func__);
}

触摸移动的时候调用

// 当手指在view上移动的时候
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    
    UITouch *touch = [touches anyObject];
    
    // 获取当前点
    CGPoint currentPoint = [touch locationInView:self];
   
    // 获取上一个点
    CGPoint previousPoint = [touch previousLocationInView:self];
    
    // 获取 X 轴的偏移量
    CGFloat x = currentPoint.x - previousPoint.x;
    
    // 获取 Y 轴的偏移量
    CGFloat y = currentPoint.y - previousPoint.y;
    
    // 修改 view 的位置
    self.transform = CGAffineTransformTranslate(self.transform, x, y);
    
}

触摸事件被打断的时候

// 当触摸事件被打断的时候调用(电话打入)
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    
}