获取当前视图控制器

.h 中暴露接口

#import

import

UIViewController * currentVC();

.m 中实现

#import "HelpMethodManager.h"
 
 
UIViewController * findBestVC(UIViewController *vc) {
 if (vc.presentedViewController) {
 return findBestVC(vc.presentedViewController);
 } else if ([vc isKindOfClass:[UISplitViewController class]]) {
 UISplitViewController *sp = (UISplitViewController *)vc;
 return sp.viewControllers.count > 0 ? findBestVC(sp.viewControllers.lastObject) : vc;
 } else if ([vc isKindOfClass:[UINavigationController class]]) {
 UINavigationController *na = (UINavigationController *)vc;
 return na.viewControllers.count > 0 ? findBestVC(na.topViewController) : vc;
 } else if ([vc isKindOfClass:[UITabBarController class]]) {
 UITabBarController *ta = (UITabBarController *)vc;
 return ta.viewControllers.count > 0 ? findBestVC(ta.selectedViewController) : vc;
 }
 return vc;
 }
 UIViewController * currentVC() {
 UIViewController *rootVC = [UIApplication sharedApplication].keyWindow.rootViewController;
 return findBestVC(rootVC);
 }

如果页面跳转，currentVC() 的值也将改变，他永远获取当前页面的控制器。