项目总结五：iOS给项目在后台添加模糊效果

项目在开发过程中，由于安全问题，需要让项目在后台时候添加模糊处理。并且在前台的时候把模糊处理关掉。

后台处理

- (UIViewController*)getCurrentVC

{UIViewController*result =nil;

if(self.window.windowLevel!=UIWindowLevelNormal)

{

NSArray*windows = [[UIApplicationsharedApplication]windows];

for(UIWindow* tmpWininwindows)

{

if(tmpWin.windowLevel==UIWindowLevelNormal)

{

self.window= tmpWin;

break;

}}}

UIView*frontView = [[self.windowsubviews]lastObject];

idnextResponder = [frontViewnextResponder];

if([nextResponderisKindOfClass:[UIViewControllerclass]]){

result = nextResponder;}

//else{

//result = self.window.rootViewController;

//}

returnresult;}

//截取当前视图为图片

- (UIImage*)snapshot:(UIView*)view

{

UIGraphicsBeginImageContextWithOptions(view.bounds.size,YES,0);

[viewdrawViewHierarchyInRect:view.boundsafterScreenUpdates:YES];

UIImage*image =UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

returnimage;

}

- (void)applicationWillResignActive:(UIApplication*)application

{

//盖上view

//进入后台盖上view，实现模糊效果

UIView* view = [[UIViewalloc]initWithFrame:[UIScreenmainScreen].bounds];

UIImageView*imageV = [[UIImageViewalloc]initWithFrame:[UIScreenmainScreen].bounds];

//获取当前视图控制器

UIViewController*vc = [selfgetCurrentVC];

//截取当前视图为图片

imageV.image= [selfsnapshot:vc.view];

//添加毛玻璃效果

UIBlurEffect*blur = [UIBlurEffecteffectWithStyle:UIBlurEffectStyleExtraLight];

UIVisualEffectView*effectview = [[UIVisualEffectViewalloc]initWithEffect:blur];

effectview.frame= [UIScreenmainScreen].bounds;

effectview.alpha=0.9f;

[imageVaddSubview:effectview];

view.tag=1111;

[viewaddSubview:imageV];

[self.windowaddSubview:view];

}

前台处理:

- (void)applicationDidBecomeActive:(UIApplication*)application {

debugLog(@"app did become active.\n");

//移除

NSArray* array = [[UIApplicationsharedApplication]keyWindow].subviews;

for(idviewinarray)

{

if([viewisKindOfClass:[UIViewclass]])

{

UIView* myView = view;

if(myView.tag==1111)

{

[myViewremoveFromSuperview];

}}}}