获取UIViewController的几个方法

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从UIWindow获取：

@implementation UIWindow (EZ_helper)- (UIViewController*) ez_topMostController{    UIViewController *topController = [self rootViewController];        //  Getting topMost ViewController    while ([topController presentedViewController])topController = [topController presentedViewController];        //  Returning topMost ViewController    return topController;}- (UIViewController*)ez_currentViewController;{    UIViewController *currentViewController = [self ez_topMostController];        while ([currentViewController isKindOfClass:[UINavigationController class]] && [(UINavigationController*)currentViewController topViewController])        currentViewController = [(UINavigationController*)currentViewController topViewController];        return currentViewController;}@end

从UIView获取：

@implementation UIView (EZ_Find)- (UIViewController *)ez_viewController{        UIResponder *responder = self;    while ((responder = [responder nextResponder])){        if ([responder isKindOfClass: [UIViewController class]]){            return (UIViewController *)responder;        }    }    return nil;}@end

从UIViewController获取：

@implementation UIViewController (EZ_Helper)- (UIViewController*) ez_topMostController{    UIViewController *topController = self ;        //  Getting topMost ViewController    while ([self presentedViewController])topController = [topController presentedViewController];        //  Returning topMost ViewController    return topController;}- (UIViewController*)ez_currentViewController;{    UIViewController *currentViewController = [self ez_topMostController];        while ([currentViewController isKindOfClass:[UINavigationController class]] && [(UINavigationController*)currentViewController topViewController])    currentViewController = [(UINavigationController*)currentViewController topViewController];        return currentViewController;}end

获取当前view的UIViewController

@implementation UIViewController (EZ_Helper)+ (UIViewController *)ez_currentViewControllerFromcurrentView{    UIViewController *result = nil;    // 1. get current window    UIWindow * window = [[UIApplication sharedApplication] keyWindow];    if (window.windowLevel != UIWindowLevelNormal) {        NSArray *windows = [[UIApplication sharedApplication] windows];        for(UIWindow * tmpWin in windows) {            if (tmpWin.windowLevel == UIWindowLevelNormal) {                window = tmpWin;                break;            }        }    }    // 2. get current View Controller    UIView *frontView = [[window subviews] objectAtIndex:0];    id nextResponder = [frontView nextResponder];    if ([nextResponder isKindOfClass:[UIViewController class]]) {        result = nextResponder;    } else {        result = window.rootViewController;    }    return result;}end

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