手动编程 NSLayoutConstraint

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项目中有个admob view是后期加上的 没写在storyboard里  所以new出来后需要手动加上NSLayoutConstraint

 

加的时候怎么也调不好后来发现是少了一句

 

[bannerView setTranslatesAutoresizingMaskIntoConstraints: NO];

 

加上这句程序运行就一切符合自己期待了

 

 

    [bannerView setTranslatesAutoresizingMaskIntoConstraints: NO];
    NSLayoutConstraint *centerX = [bannerView.centerXAnchor constraintEqualToAnchor: self.view.centerXAnchor];
    NSLayoutConstraint *bottom = [bannerView.bottomAnchor constraintEqualToAnchor: self.bottomview.topAnchor];
    
   [NSLayoutConstraint activateConstraints: @[centerX, bottom]];