得到当前活动的controller

UIWindow+PazLabs.h (header file)

#import <UIKit/UIKit.h>



@interface UIWindow (PazLabs)



- (UIViewController *) visibleViewController;



@end

　　

UIWindow+PazLabs.m (implementation file)

#import "UIWindow+PazLabs.h"



@implementation UIWindow (PazLabs)



- (UIViewController *)visibleViewController {



    UIViewController *rootViewController = self.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;



        }



    }



}



@end