UIButton移动与事件点击

如果要要button能够移动，有两种办法
一：这种办法能移动，但暂时我还不能让它移动，addTarget方法也没用。

方法失效：

[btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];

能移动：

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    
    UITouch *touch = [touches anyObject];
    
    //当前的point
    CGPoint currentP = [touch locationInView:self];
    
    //以前的point
    CGPoint preP = [touch previousLocationInView:self];
    
    //x轴偏移的量
    CGFloat offsetX = currentP.x - preP.x;
    
    //Y轴偏移的量
    CGFloat offsetY = currentP.y - preP.y;
    
    self.transform = CGAffineTransformTranslate(self.transform, offsetX, offsetY);
    
}

二：这种办法能移动，也能点击

UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
[btn addGestureRecognizer:pan];

点击事件有用：

[btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];

移动：

- (void)pan:(UIPanGestureRecognizer *)recognizer{
    
    
    CGPoint translation = [recognizer translationInView:[self superview]];
    CGPoint newCenter = CGPointMake(recognizer.view.center.x+ translation.x,
                                    recognizer.view.center.y + translation.y);//    限制屏幕范围：
    newCenter.y = MAX(recognizer.view.frame.size.height/2, newCenter.y);
    newCenter.y = MIN([self superview].frame.size.height - recognizer.view.frame.size.height/2,  newCenter.y);
    newCenter.x = MAX(recognizer.view.frame.size.width/2, newCenter.x);
    newCenter.x = MIN([self superview].frame.size.width - recognizer.view.frame.size.width/2,newCenter.x);
    recognizer.view.center = newCenter;
    [recognizer setTranslation:CGPointZero inView:[self superview]];
}