app 进入后台进行模糊处理
金融类app防止信息在后台中被一些恶意截屏软件进行截屏,对进入后台的app做模糊处理
- (void)applicationWillResignActive:(UIApplication *)application {
//进入后台盖上view,实现模糊效果
UIView* view = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
UIImageView *imageV = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds];
//获取当前视图控制器
UIViewController *vc = [self getCurrentVC];
//截取当前视图为图片
imageV.image = [self snapshot:vc.view];
//添加毛玻璃效果
UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
UIVisualEffectView *effectview = [[UIVisualEffectView alloc] initWithEffect:blur];
effectview.frame = [UIScreen mainScreen].bounds;
[imageV addSubview:effectview];
view.tag = 1111;
[view addSubview:imageV];
[self.window addSubview:view];
}
//获取当前控制器
- (UIViewController *)getCurrentVC {
UIWindow *window = [[UIApplication sharedApplication].windows firstObject];
if (!window) {
return nil;
}
UIView *tempView;
for (UIView *subview in window.subviews) {
if ([[subview.classForCoder description] isEqualToString:@"UILayoutContainerView"]) {
tempView = subview;
break;
}
}
if (!tempView) {
tempView = [window.subviews lastObject];
}
id nextResponder = [tempView nextResponder];
while (![nextResponder isKindOfClass:[UIViewController class]] || [nextResponder isKindOfClass:[UINavigationController class]] || [nextResponder isKindOfClass:[UITabBarController class]]) {
tempView = [tempView.subviews firstObject];
if (!tempView) {
return nil;
}
nextResponder = [tempView nextResponder];
}
return (UIViewController *)nextResponder;
}
//截取当前视图为图片
- (UIImage *)snapshot:(UIView *)view
{
UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0);
[view drawViewHierarchyInRect:view.bounds afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
同时在app进入前台中需要把模糊界面去除
- (void)applicationDidBecomeActive:(UIApplication *)application {
UIView *view = (UIView *)[self.window viewWithTag:1111];
[view removeFromSuperview];
}