从应用程序委托获取当前视图控制器 [英] Get the current view controller from the app delegate
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问题描述
推荐答案
p>这是我用来查找用户最有可能交互的当前视图控制器:
This is what I use for finding the current view controller that the user is most likely interacting with:
UIViewController + Utils.h / p>
UIViewController+Utils.h
#import <UIKit/UIKit.h>
@interface UIViewController (Utils)
+(UIViewController*) currentViewController;
@end
UIViewController + Utils.m
#import "UIViewController+Utils.h"
@implementation UIViewController (Utils)
+(UIViewController*) findBestViewController:(UIViewController*)vc {
if (vc.presentedViewController) {
// Return presented view controller
return [UIViewController findBestViewController:vc.presentedViewController];
} else if ([vc isKindOfClass:[UISplitViewController class]]) {
// Return right hand side
UISplitViewController* svc = (UISplitViewController*) vc;
if (svc.viewControllers.count > 0)
return [UIViewController findBestViewController:svc.viewControllers.lastObject];
else
return vc;
} else if ([vc isKindOfClass:[UINavigationController class]]) {
// Return top view
UINavigationController* svc = (UINavigationController*) vc;
if (svc.viewControllers.count > 0)
return [UIViewController findBestViewController:svc.topViewController];
else
return vc;
} else if ([vc isKindOfClass:[UITabBarController class]]) {
// Return visible view
UITabBarController* svc = (UITabBarController*) vc;
if (svc.viewControllers.count > 0)
return [UIViewController findBestViewController:svc.selectedViewController];
else
return vc;
} else {
// Unknown view controller type, return last child view controller
return vc;
}
}
+(UIViewController*) currentViewController {
// Find best view controller
UIViewController* viewController = [UIApplication sharedApplication].keyWindow.rootViewController;
return [UIViewController findBestViewController:viewController];
}
@end
我需要在应用程序的任何地方使用当前的视图控制器,只需使用:
Then whenever I need the current view controller from anywhere in the app simply use:
[UIViewController currentViewController]
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