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转载自: http://www.cnblogs.com/angzn/p/3696901.html
1、自定义Back按钮
iOS中很多时候我们都会自定义返回按钮，也是一件easy的事，类似如下：
// 返回按钮 1 - (void)showNavBackButton 2 { 3 UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom]; 4 [backButton addTarget:self action:@selector(backButtonAction:) 5 forControlEvents:UIControlEventTouchUpInside]; 6 [backButton setBackgroundImage:[UIImage imageNamed:@"00_back_button"] 7 forState:UIControlStateNormal]; 8 [backButton setTitle:kLoc(@"Back") forState:UIControlStateNormal]; 9 [backButton setTitleEdgeInsets:UIEdgeInsetsMake(0, 5, 1, 0)];10 backButton.titleLabel.font = kMediumFont(12);11 backButton.frame = CGRectMake(0, 0, 51, 31);12 self.navigationItem.leftBarButtonItem13 = [[UIBarButtonItem alloc] initWithCustomView:backButton];14 } 但是，这样在iOS7下Pop interactive gesture就不好使了。
这里 有一个解决方法。
但是，测试发现在栈中推入一个controller后，快速向左平滑，将会引起崩溃。
查看崩溃日志，发现如下信息：
| 1 | nested pop animation can result in corrupted navigation bar |
2、解决Pop interactive gesture问题
优化的解决方案是简单的让NavigationController自己成为响应的接受者，最好用一个UINavigationController的子类。
1)在过渡的时候禁用interactivePopGestureRecognizer
2)当新的视图控制器加载完成后再启用，建议使用UINavigationController的子类操作
// 自定义NavigationController 1 @interface DCBaseNavigationController () 2 < 3 UINavigationControllerDelegate, 4 UIGestureRecognizerDelegate 5 > 6 @end 7 8 @implementation DCBaseNavigationController 9 10 - (void)dealloc11 {12 self.interactivePopGestureRecognizer.delegate = nil;13 self.delegate = nil;14 15 [super dealloc];16 }17 18 #pragma mark - View lifecycle19 20 - (void)viewDidLoad21 {22 [super viewDidLoad];23 // Do any additional setup after loading the view.24 25 if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]) {26 self.interactivePopGestureRecognizer.delegate = self;27 self.delegate = self;28 }29 }30 31 - (void)didReceiveMemoryWarning32 {33 [super didReceiveMemoryWarning];34 // Dispose of any resources that can be recreated.35 }36 37 #pragma mark - Override38 39 - (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated40 {41 // Hijack the push method to disable the gesture42 if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]) {43 self.interactivePopGestureRecognizer.enabled = NO;44 }45 46 [super pushViewController:viewController animated:animated];47 }48 49 #pragma mark - UINavigationControllerDelegate50 51 - (void)navigationController:(UINavigationController *)navigationController52 didShowViewController:(UIViewController *)viewController53 animated:(BOOL)animate54 {55 if ([navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {56 navigationController.interactivePopGestureRecognizer.enabled = YES;57 }58 }59 60 @end
3、Pop interactive gesture冲突，造成页面假死问题
我遇到的情况是，Push/Pop页面时，没有立即得到想要的效果，页面没有显出出来，NavigationController的didShowViewController:回调方法也没有调用。
页面布局情况是这样的：视图A，有一个Pan手势；视图B是TabBarController，其ViewControllers都是NavigationController。视图B是视图A的子视图。
后来找到原因是：navigationController的interactive pop手势与视图A的pan手势冲突。
具体原因是：rootViewController加载时，调用了didShowViewController:，设置interactivePopGestureRecognizer可用，其实我们并不需要在root的时候也触发这个手势。所以稍加优化如下：
// 优化 1 - (void)navigationController:(UINavigationController *)navigationController 2 didShowViewController:(UIViewController *)viewController 3 animated:(BOOL)animate 4 { 5 if ([navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) { 6 //if ([[navigationController.viewControllers firstObject] isEqual:viewController]) { 7 if ([navigationController.viewControllers count] == 1) { 8 // Disable the interactive pop gesture in the rootViewController of navigationController 9 navigationController.interactivePopGestureRecognizer.enabled = NO;10 } else {11 // Enable the interactive pop gesture12 navigationController.interactivePopGestureRecognizer.enabled = YES;13 }14 }15 } 当前显示的是root时，设置interactivePopGestureRecognizer不可用，非root时设置interactivePopGestureRecognizer可用。
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