1.

ex_one.gif

2.添加在当前控制器页面上 只在当前VC的view中显示可左右上下滑动 全局的话加在window上 直接上代码

- (UIButton *)factBtn{
    if (!_factBtn) {
        _factBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        _factBtn.frame = CGRectMake(kSWidth-65, 0.7*kSHeight, 40,40);
        [_factBtn setImage:[UIImage imageNamed:@"baoliao"] forState:UIControlStateNormal];
        [_factBtn addTarget:self action:@selector(factBtnClick:) forControlEvents:UIControlEventTouchUpInside];
        UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc]
                                                        initWithTarget:self
                                                        action:@selector(handlePan:)];
        
        [_factBtn addGestureRecognizer:panGestureRecognizer];
    }
    return _factBtn;
}


- (void) handlePan:(UIPanGestureRecognizer*) recognizer

{
    
    CGPoint translation = [recognizer translationInView:self.view];
    CGFloat centerX=recognizer.view.center.x+ translation.x;
    CGFloat thecenter=0;
    recognizer.view.center=CGPointMake(centerX,
                                       recognizer.view.center.y+ translation.y);
    [recognizer setTranslation:CGPointZero inView:self.view];
    if(recognizer.state==UIGestureRecognizerStateEnded|| recognizer.state==UIGestureRecognizerStateCancelled) {
        if(centerX>kSWidth/2) {
            thecenter=kSWidth-40/2;
        }else{
            thecenter=40/2;
        }
             // contentOff_Y button允许拖动的Y值 根据需求调整(button没有Y值限制时删除下面两个判断即可) 
            //  Height_TabBar: tabbar高度  Height_NavBar: navbar 高度
        CGFloat contentOff_Y = recognizer.view.center.y;
        if (contentOff_Y > kSHeight-Height_TabBar-40) {
            contentOff_Y = kSHeight-Height_TabBar-20;
        }
        if (contentOff_Y < Height_NavBar) {
            contentOff_Y = Height_NavBar+20;
        }
        
        [UIView animateWithDuration:0.3 animations:^{
            recognizer.view.center=CGPointMake(thecenter,
                                               contentOff_Y+ translation.y);
            
        }];
    }
}