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我看到了一些关于此的帖子，但似乎都没有回答我的问题......

我的视图底部有一个菜单，限制在底部布局指南中，这样当广告加载时使用

self.candisplaybannerads = true;

菜单也向上移动。在 iOS7 中，这种过渡是平滑的，并且菜单随着横幅向上滑动而向上滑动。但在 iOS8 中，菜单会弹出到新位置，然后横幅会平滑地向上滑动。有没有其他人经历过这个或知道如何解决它。谢谢

示例项目：https://github.com/jbestor/adTest（在示例项目中，iOS7 或 iOS8 都没有平滑地向上滑动）。

按钮菜单的约束：

//button1
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:_button1 attribute:NSLayoutAttributeTrailing
                                                      relatedBy:NSLayoutRelationEqual toItem:self.view
                                                      attribute:NSLayoutAttributeTrailing multiplier:1.0 constant:0.0]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:_button1 attribute:NSLayoutAttributeBottom
                                                      relatedBy:NSLayoutRelationEqual toItem:self.bottomLayoutGuide
                                                      attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:_button1 attribute:NSLayoutAttributeWidth
                                                      relatedBy:NSLayoutRelationEqual toItem:nil
                                                      attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:50]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:_button1 attribute:NSLayoutAttributeHeight
                                                      relatedBy:NSLayoutRelationEqual toItem:nil
                                                      attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:50]];

//button2
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:_button2 attribute:NSLayoutAttributeLeading
                                                      relatedBy:NSLayoutRelationEqual toItem:self.view
                                                      attribute:NSLayoutAttributeLeading multiplier:1.0 constant:0.0]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:_button2 attribute:NSLayoutAttributeBottom
                                                      relatedBy:NSLayoutRelationEqual toItem:self.bottomLayoutGuide
                                                      attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:_button2 attribute:NSLayoutAttributeWidth
                                                      relatedBy:NSLayoutRelationEqual toItem:nil
                                                      attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:50]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:_button2 attribute:NSLayoutAttributeHeight
                                                      relatedBy:NSLayoutRelationEqual toItem:nil
                                                      attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:50]];

//button3
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:_button3 attribute:NSLayoutAttributeLeading
                                                      relatedBy:NSLayoutRelationEqual toItem:self.view
                                                      attribute:NSLayoutAttributeLeading multiplier:1.0 constant:0.0]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:_button3 attribute:NSLayoutAttributeBottom
                                                      relatedBy:NSLayoutRelationEqual toItem:self.bottomLayoutGuide
                                                      attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:_button3 attribute:NSLayoutAttributeWidth
                                                      relatedBy:NSLayoutRelationEqual toItem:nil
                                                      attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:self.view.frame.size.width]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:_button3 attribute:NSLayoutAttributeHeight
                                                      relatedBy:NSLayoutRelationEqual toItem:nil
                                                      attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:50]];
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