我发现一些敏感类的 app （比如金融类），都会在切换 app 的界面里把自己显示模糊，好像支付宝也是这样，他们是怎么实现这个的呢？ 
iOS 开发实用技术导航 NSHipster 中文版 http://nshipster.cn/ cocos2d 开源 2D 游戏引擎 http://www.cocos2d-iphone.org/ CocoaPods http://cocoapods.org/ Google Analytics for Mobile 统计解决方案 http://code.google.com/mobile/analytics/ WWDC https://developer.apple.com/wwdc/ Design Guides and Resources https://developer.apple.com/design/ Transcripts of WWDC sessions http://asciiwwdc.com Cocoa with Love http://cocoawithlove.com/ Cocoa Dev Central http://cocoadevcentral.com/ NSHipster http://nshipster.com/ Style Guides Google Objective-C Style Guide NYTimes Objective-C Style Guide Useful Tools and Services Charles Web Debugging Proxy Smore
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 | 1 chipmuck May 11, 2017  1 在 AppDelegate 里面的 ```-applicationDidEnterBackground:``` 生命周期方法中创建一个 ```UIVisualEffectView``` 对象，并把它添加于 ```self.window``` 上。 |
 | 4 jackisnotspirate May 11, 2017 via iPhone |
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