UI_拖动View

方法一

在touchesMoved中

     // 获取到触摸的手指
     UITouch *touch = [touches anyObject]; // 获取集合中对象
     // 获取開始时的触摸点
     CGPoint previousPoint = [touch previousLocationInView:self];
     // 获取当前的触摸点
     CGPoint latePoint = [touch locationInView:self];
     // 获取当前点的位移量
     CGFloat dx = latePoint.x - previousPoint.x;
     CGFloat dy = latePoint.y - previousPoint.y;
     // 获取当前视图的center
     CGPoint center = self.center;
     // 依据位移量改动center的值
     center.x += dx;
     center.y += dy;
     // 把新的center赋给当前视图
     self.center = center;

方法二

#pragma mark - 重写方法
#pragma mark 触摸開始
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    self.startPoint = [touch locationInView:self];

    NSLog(@"%s",__FUNCTION__);
}

#pragma mark - 触摸移动
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"%s",__FUNCTION__);

    // 实现touchview随手势移动

    UITouch *touch = [touches anyObject];
    self.endPoint = [touch locationInView:self];
    CGFloat x = _endPoint.x - _startPoint.x;
    CGFloat y = _endPoint.y - _startPoint.y;

    CGPoint center = self.center;

    center.x += x;
    center.y += y;
    self.center = center;
}