弹出菜单效果

- (void)showPopoverAtPoint:(CGPoint)point inView:(UIView *)view withContentView:(UIView *)cView

{

 //self为弹出内容cView的superview  

  self.boxFrame = cView.frame;

    self.contentView = cView;

    UIWindow *window = [UIApplication sharedApplication].keyWindow;

    if(!window) {

        window = [[UIApplication sharedApplication].windows objectAtIndex:0];

    }

    UIView *topView = window;//[[window subviews] objectAtIndex:0];

    

    CGPoint topPoint = [topView convertPoint:point fromView:view];

    CGRect topViewBounds = topView.bounds;

    _contentView.frame = _boxFrame;

    _contentView.hidden = NO;

    [self addSubview:_contentView];

    

    self.layer.anchorPoint = CGPointMake(topPoint.x / topViewBounds.size.width, topPoint.y / topViewBounds.size.height);

    self.frame = topViewBounds;

    [self setNeedsDisplay];

    

    [topView addSubview:self];

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)];

    [self addGestureRecognizer:tap];

    self.userInteractionEnabled = YES;

    

  //第一步,透明+缩小

    self.alpha = 0.f;

    self.transform = CGAffineTransformMakeScale(0.1f, 0.1f);

    

    [UIView animateWithDuration:0.5f delay:0.f options:UIViewAnimationOptionCurveEaseInOut animations:^{

         //不透明,并且放大到比原来大小稍大

    self.alpha = 1.f;

        self.transform = CGAffineTransformMakeScale(1.05f, 1.05f);

    } completion:^(BOOL finished) {

        [UIView animateWithDuration:0.08f delay:0.f options:UIViewAnimationOptionCurveEaseInOut animations:^{

    //恢复大小到原大小

            self.transform = CGAffineTransformIdentity;

        } completion:nil];

    }];

}

原文地址:https://www.cnblogs.com/ldc529/p/3831009.html