本文提供了两种方法来获取iOS应用中当前显示在最顶层的ViewController。这两种方法递归地检查导航控制器、标签栏控制器及被展示的视图控制器，直至找到实际显示的内容视图控制器。
方法一
- (UIViewController *)topViewController {
UIViewController *resultVC;
resultVC = [self _topViewController:[[UIApplication sharedApplication].keyWindow rootViewController]];
while (resultVC.presentedViewController) {
resultVC = [self _topViewController:resultVC.presentedViewController];
}
return resultVC;
}
- (UIViewController *)_topViewController:(UIViewController *)vc {
if ([vc isKindOfClass:[UINavigationController class]]) {
return [self _topViewController:[(UINavigationController *)vc topViewController]];
} else if ([vc isKindOfClass:[UITabBarController class]]) {
return [self _topViewController:[(UITabBarController *)vc selectedViewController]];
} else {
return vc;
}
return nil;
}
方法二
-(UIViewController *)getTopViewController:(UIViewController *)viewController {
if ([viewController isKindOfClass:[UITabBarController class]]) {
return [self getTopViewController:[(UITabBarController *)viewController selectedViewController]];
} else if ([viewController isKindOfClass:[UINavigationController class]]) {
return [self getTopViewController:[(UINavigationController *)viewController topViewController]];
} else if (viewController.presentedViewController) {
return [self getTopViewController:viewController.presentedViewController];
} else {
return viewController;
}
}
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