1.我们在非视图类中想要随时展示一个view时,需要将被展示的view加到当前view的子视图,或用当前view presentViewController,或pushViewContrller,这些操作都需要获取当前正在显示的ViewController。
[objc] view plain copy
- //获取当前屏幕显示的viewcontroller
- - (UIViewController *)getCurrentVC
- {
- UIViewController *result = nil;
- UIWindow * window = [[UIApplication sharedApplication] keyWindow];
- if (window.windowLevel != UIWindowLevelNormal)
- {
- NSArray *windows = [[UIApplication sharedApplication] windows];
- for(UIWindow * tmpWin in windows)
- {
- if (tmpWin.windowLevel == UIWindowLevelNormal)
- {
- window = tmpWin;
- break;
- }
- }
- }
- UIView *frontView = [[window subviews] objectAtIndex:0];
- id nextResponder = [frontView nextResponder];
- if ([nextResponder isKindOfClass:[UIViewController class]])
- result = nextResponder;
- else
- result = window.rootViewController;
- return result;
- }
2.获取当前屏幕中present出来的viewcontroller。
[objc] view plain copy
- - (UIViewController *)getPresentedViewController
- {
- UIViewController *appRootVC = [UIApplication sharedApplication].keyWindow.rootViewController;
- UIViewController *topVC = appRootVC;
- if (topVC.presentedViewController) {
- topVC = topVC.presentedViewController;
- }
- return topVC;
- }
时间: 2024-10-10 18:08:35