facebook pop

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"+" style:UIBarButtonItemStyleDone target:self action:@selector(showPop)];

- (void)showPop{

    if (_isOpened) {
        [self hidePop];
        return;
    }
    _isOpened = YES;

    POPSpringAnimation *positionAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPViewFrame];
    positionAnimation.fromValue = [NSValue valueWithCGRect:_hidePosition];
    positionAnimation.toValue = [NSValue valueWithCGRect:_showPosition];
    positionAnimation.springBounciness = 15.0f;
    positionAnimation.springSpeed = 20.0f;
    [_popView pop_addAnimation:positionAnimation forKey:@"frameAnimation"];
}

- (void)hidePop{

    POPBasicAnimation *positionAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPViewFrame];
    positionAnimation.fromValue = [NSValue valueWithCGRect:_showPosition];
    positionAnimation.toValue = [NSValue valueWithCGRect:_hidePosition];
    //key一样就会用后面的动画覆盖之前的
    [_popView pop_addAnimation:positionAnimation forKey:@"frameAnimation"];

    _isOpened = NO;
}

  
  

   
   代码实现了一个边角弹出菜单效果
  
  

原文链接  https://github.com/jxd001/POPdemo/blob/master/README.md