////  UINavigationController+POP.h//  YouXianMing////  Created by YouXianMing on 14-9-20.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import <UIKit/UIKit.h>@interface UINavigationController (POP)- (NSArray *)popToViewControllerClass:(Class)viewControllerClass animated:(BOOL)animated;@end

////  UINavigationController+POP.m//  YouXianMing////  Created by YouXianMing on 14-9-20.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "UINavigationController+POP.h"@implementation UINavigationController (POP)- (NSArray *)popToViewControllerClass:(Class)viewControllerClass animated:(BOOL)animated{    UIViewController *controller = nil;

    for (UIViewController *oneController in self.viewControllers) {

        if ([oneController isMemberOfClass:viewControllerClass]) {

            controller = oneController;

            break;

        }

    }

if (controller == nil) {        NSLog(@"%s:%s:%d 要pop的控制器指针为空", __FILE__, __func__, __LINE__);        return nil;    }        return [self popToViewController:controller                            animated:animated];}@end

////  RootViewController.m//  YouXianMing////  Created by YouXianMing on 14-9-20.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "RootViewController.h"#import "SecondViewController.h"@interface RootViewController ()@end@implementation RootViewController- (void)viewDidLoad{    [super viewDidLoad];        // 设置导航栏样式以及标题以及view的背景色    [self titleTextAttributes:[self createTitleTextAttributes:[UIColor redColor]]];    self.title = @"First ViewController";    self.view.backgroundColor = [UIColor whiteColor];        // 添加手势    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self                                                                          action:@selector(tapEvent)];    [self.view addGestureRecognizer:tap];}- (void)tapEvent{    [self.navigationController pushViewController:[SecondViewController new]                                         animated:YES];}- (NCTitleAttribute *)createTitleTextAttributes:(UIColor *)color{    NCTitleAttribute *titleAttribute = [NCTitleAttribute new];    titleAttribute.titleFont         = [UIFont fontWithName:@"HelveticaNeue-Thin" size:20.f];    titleAttribute.titleColor        = color;        return titleAttribute;}@end

////  SecondViewController.m//  YouXianMing////  Created by YouXianMing on 14-9-20.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "SecondViewController.h"#import "ThirdViewController.h"@interface SecondViewController ()@end@implementation SecondViewController- (void)viewDidLoad{    [super viewDidLoad];        // 设置导航栏样式以及标题    [self titleTextAttributes:[self createTitleTextAttributes:[UIColor redColor]]];    self.title = @"Second ViewController";    self.view.backgroundColor = [UIColor redColor];        // 添加手势    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self                                                                          action:@selector(tapEvent)];    [self.view addGestureRecognizer:tap];}- (void)tapEvent{    [self.navigationController pushViewController:[ThirdViewController new]                                         animated:YES];}- (NCTitleAttribute *)createTitleTextAttributes:(UIColor *)color{    NCTitleAttribute *titleAttribute = [NCTitleAttribute new];    titleAttribute.titleFont         = [UIFont fontWithName:@"HelveticaNeue-Thin" size:20.f];    titleAttribute.titleColor        = color;        return titleAttribute;}@end

////  ThirdViewController.m//  YouXianMing////  Created by YouXianMing on 14-9-20.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "ThirdViewController.h"#import "RootViewController.h"@interface ThirdViewController ()@end@implementation ThirdViewController- (void)viewDidLoad{    [super viewDidLoad];        // 设置导航栏样式以及标题    [self titleTextAttributes:[self createTitleTextAttributes:[UIColor redColor]]];    self.title = @"Third ViewController";    self.view.backgroundColor = [UIColor cyanColor];        // 添加手势    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self                                                                          action:@selector(tapEvent)];    [self.view addGestureRecognizer:tap];}- (void)tapEvent{    [self.navigationController popToViewControllerClass:[RootViewController class]                                               animated:YES];}- (NCTitleAttribute *)createTitleTextAttributes:(UIColor *)color{    NCTitleAttribute *titleAttribute = [NCTitleAttribute new];    titleAttribute.titleFont         = [UIFont fontWithName:@"HelveticaNeue-Thin" size:20.f];    titleAttribute.titleColor        = color;        return titleAttribute;}@end