UINavigationController 中有visibleViewController和topViewController
visibleViewController 當(dāng)前顯示的控制器
topViewController 是某個(gè)導(dǎo)航棧的棧頂視圖
visibleViewController跟導(dǎo)航棧沒有關(guān)系，只是當(dāng)前顯示的控制器，也就是說任意一個(gè)導(dǎo)航的visibleViewController所返回的值應(yīng)該是一樣的,
topViewController 是某個(gè)導(dǎo)航棧的棧頂視圖盟猖，和導(dǎo)航控制器相關(guān)
換句話說如果在僅有一個(gè)導(dǎo)航棧上驾中，visibleViewController和topViewController應(yīng)該是沒有區(qū)別的。
方法一 : 獲取當(dāng)前顯示的控制器 UIWindow (Visible)
- (UIViewController *)visibleViewController {
UIViewController *rootViewController =[[[[UIApplication sharedApplication] delegate] window] rootViewController];
return [UIWindow getVisibleViewControllerFrom:rootViewController];
}
+ (UIViewController *)getVisibleViewControllerFrom:(UIViewController *)vc {
if ([vc isKindOfClass:[UINavigationController class]]) {
return [UIWindow getVisibleViewControllerFrom:[((UINavigationController *) vc) visibleViewController]];
} else if ([vc isKindOfClass:[UITabBarController class]]) {
return [UIWindow getVisibleViewControllerFrom:[((UITabBarController *) vc) selectedViewController]];
} else {
if (vc.presentedViewController) {
return [UIWindow getVisibleViewControllerFrom:vc.presentedViewController];
} else {
return vc;
}
}
}
方法二 :
- (UIViewController*)topViewControllerWithRootViewController:(UIViewController*)rootViewController {
if ([rootViewController isKindOfClass:[UITabBarController class]]) {
UITabBarController* tabBarController = (UITabBarController*)rootViewController;
return [self topViewControllerWithRootViewController:tabBarController.selectedViewController];
} else if ([rootViewController isKindOfClass:[UINavigationController class]]) {
UINavigationController* navigationController = (UINavigationController*)rootViewController;
return [self topViewControllerWithRootViewController:navigationController.visibleViewController];
} else if (rootViewController.presentedViewController) {
UIViewController* presentedViewController = rootViewController.presentedViewController;
return [self topViewControllerWithRootViewController:presentedViewController];
} else {
return rootViewController;
}
}
