当应用进入后台，或从iOS多任务中心选择APP时，为APP覆盖上毛玻璃层，保护用户隐私

Show blur layer when your app is in iOS multitask center

• 将ImageBlur文件夹拖入你的项目中

  Drag ImageBlurFolder to your project.

• 在Appdelegate.h文件中#import "BlurBackground.h"

  Add #import "BlurBackground.h"to Appdelegate.h.

• 在applicationWillResignActive方法中,调用addBluredBackground:(UIWindow *)window即可添加毛玻璃层

  Call addBluredBackground:(UIWindow *)window method in applicationWillResignActive to show blur layer.

• 在applicationDidBecomeActive方法中,调用removeBluredBackground即可移除毛玻璃层

  Call removeBluredBackground method in applicationDidBecomeActive` to remove blur layer.

具体细节参考Demo

For more details,view the Demo code.