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。