创建一个可移动的视图，让视图随着鼠标的移动而移动

1.首先自己定义视图,继承自UIView

MoveView.h

@interface MoveView :UIView

@property(nonatomic,assign)CGPoint beginPoint;

//记录点击的最初位置

@end

MoveView.m

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

{

    UITouch *touch=[touches anyObject];

    //记录下触摸的最初位置。相对于自身

    _beginPoint=[touch locationInView:self];

}

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

{

    UITouch *touch=[touches anyObject];

//记录移动到的位置,此时此时相对于父视图

    CGPoint endPoint=[touch locationInView:self.superview];

    [self setFrame:CGRectMake(endPoint.x-_beginPoint.x

                              , endPoint.y-_beginPoint.y,self.frame.size.width,self.frame.size.height)];

}

2.查UIView的Api可知，UIView继承自UIResponder,在UIResponder中有以下四个方法

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;//触摸開始

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;//触摸移动

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;//触摸结束

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event;//触摸取消（主要用于突发事件，此次触摸失效，比如来电话了，电话界面弹出。用户此次触摸被取消）

能够依据这几个方法对一些触摸事件进行处理。