在iOS 7中更改后退按钮会禁用滑动以返回导航

时间：2013-09-27 15:31:02

标签： ios uinavigationcontroller ios7 uibarbuttonitem uiviewanimation

我有一个iOS 7应用程序，我在这里设置一个自定义后退按钮：

    UIImage *backButtonImage = [UIImage imageNamed:@"back-button"];
    UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];

    [backButton setImage:backButtonImage forState:UIControlStateNormal];
    backButton.frame = CGRectMake(0, 0, 20, 20);

    [backButton addTarget:self
                   action:@selector(popViewController)
         forControlEvents:UIControlEventTouchUpInside];

    UIBarButtonItem *backBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
    viewController.navigationItem.leftBarButtonItem = backBarButtonItem;

但这会禁用iOS 7“从左向右滑动”手势以导航到之前的控制器。有谁知道如何设置自定义按钮并仍然启用此手势？

编辑： 我尝试设置viewController.navigationItem.backBarButtonItem，但这似乎没有显示我的自定义图像。

14 个答案:

答案 0 :(得分：77)

重要： 这是一个黑客。我建议你看一下answer。

在为我分配leftBarButtonItem之后调用以下行：

self.navigationController.interactivePopGestureRecognizer.delegate = self;

修改 如果在init方法中调用，则不起作用。它应该在viewDidLoad或类似方法中调用。

答案 1 :(得分：56)

如果可能的话，使用UINavigationBar的backIndicatorImage和backIndicatorTransitionMaskImage属性。在UIAppearanceProxy上设置这些可以轻松修改整个应用程序的行为。皱纹是你只能在ios 7上设置它们，但这样才能解决，因为你无论如何都只能在ios 7上使用pop手势。您的正常ios 6样式可以保持不变。

UINavigationBar* appearanceNavigationBar = [UINavigationBar appearance];
//the appearanceProxy returns NO, so ask the class directly
if ([[UINavigationBar class] instancesRespondToSelector:@selector(setBackIndicatorImage:)])
{
    appearanceNavigationBar.backIndicatorImage = [UIImage imageNamed:@"back"];
    appearanceNavigationBar.backIndicatorTransitionMaskImage = [UIImage imageNamed:@"back"];
    //sets back button color
    appearanceNavigationBar.tintColor = [UIColor whiteColor];
}else{
    //do ios 6 customization
}

尝试操纵interactivePopGestureRecognizer的委托会导致很多问题。

答案 2 :(得分：29)

我看到了这个解决方案http://keighl.com/post/ios7-interactive-pop-gesture-custom-back-button/，它是UINavigationController的子类。它是一个更好的解决方案，因为它处理在控制器到位之前滑动的情况 - 这会导致崩溃。

除此之外，我注意到如果你在根视图控制器上进行滑动（在按下一个后再返回），UI变得没有响应（在上面的回答中也是同样的问题）。

因此，子类UINavigationController中的代码应该如下所示：

@implementation NavigationController

- (void)viewDidLoad {
    [super viewDidLoad];
    __weak NavigationController *weakSelf = self;

    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
        self.interactivePopGestureRecognizer.delegate = weakSelf;
        self.delegate = weakSelf;
    }
}

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
    // Hijack the push method to disable the gesture
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
        self.interactivePopGestureRecognizer.enabled = NO;
    }
    [super pushViewController:viewController animated:animated];
}

#pragma mark - UINavigationControllerDelegate

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animate {
    // Enable the gesture again once the new controller is shown
    self.interactivePopGestureRecognizer.enabled = ([self respondsToSelector:@selector(interactivePopGestureRecognizer)] && [self.viewControllers count] > 1);
}

@end

答案 3 :(得分：19)

我用

[[UINavigationBar appearance] setBackIndicatorImage:[UIImage imageNamed:@"nav_back.png"]];
[[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:[UIImage imageNamed:@"nav_back.png"]];

[UIBarButtonItem.appearance setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -64) forBarMetrics:UIBarMetricsDefault];

答案 4 :(得分：6)

我还隐藏了后退按钮，将其替换为自定义leftBarItem。
在推送操作为我工作后删除interactivePopGestureRecognizer委托：

[self.navigationController pushViewController:vcToPush animated:YES];

// Enabling iOS 7 screen-edge-pan-gesture for pop action
if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
    self.navigationController.interactivePopGestureRecognizer.delegate = nil;
}

答案 5 :(得分：6)

navigationController.interactivePopGestureRecognizer.delegate = (id<UIGestureRecognizerDelegate>)self;

这是来自http://stuartkhall.com/posts/ios-7-development-tips-tricks-hacks，但它会导致一些错误：

  1. 从屏幕左边缘扫入时，将另一个viewController推入navigationController;
  2. 或者，当从navigationController弹出topViewController时，从屏幕的左边缘轻扫;

    3. e.g。当navigationController的rootViewController显示时，从屏幕的左边缘滑入，然后点击一些东西（QUICKLY）将另一个ViewController推入navigationController，然后

    • rootViewController不响应任何触摸事件;
    • 不会显示anotherViewController;
    • 再次从屏幕边缘滑动，将显示anotherViewController;
    • 点击自定义后退按钮弹出anotherViewController，崩溃！

    因此，您必须在UIGestureRecognizerDelegate中实施self.navigationController.interactivePopGestureRecognizer.delegate方法，如下所示：

    - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
    if (gestureRecognizer == navigationController.interactivePopGestureRecognizer) {
        return !navigationController.<#TODO: isPushAnimating#> && [navigationController.viewControllers count] > 1;
    }
    return YES;
}

答案 6 :(得分：6)

这是Nick H247's answer

的swift3版本 
class NavigationController: UINavigationController {
  override func viewDidLoad() {
    super.viewDidLoad()
    if responds(to: #selector(getter: interactivePopGestureRecognizer)) {
      interactivePopGestureRecognizer?.delegate = self
      delegate = self
    }
  }

  override func pushViewController(_ viewController: UIViewController, animated: Bool) {
    if responds(to: #selector(getter: interactivePopGestureRecognizer)) {
      interactivePopGestureRecognizer?.isEnabled = false
    }
    super.pushViewController(viewController, animated: animated)
  }
}

extension NavigationController: UINavigationControllerDelegate {
  func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) {
    interactivePopGestureRecognizer?.isEnabled = (responds(to: #selector(getter: interactivePopGestureRecognizer)) && viewControllers.count > 1)
  }
}

extension NavigationController: UIGestureRecognizerDelegate {}

答案 7 :(得分：3)

尝试self.navigationController. interactivePopGestureRecognizer .enabled = YES;

答案 8 :(得分：1)

我没有写这篇文章，但以下博客帮助了很多，并通过自定义导航按钮解决了我的问题：

http://keighl.com/post/ios7-interactive-pop-gesture-custom-back-button/

总之，他实现了一个使用pop手势委托的自定义UINavigationController。非常干净和便携！

代码：

@interface CBNavigationController : UINavigationController <UINavigationControllerDelegate, UIGestureRecognizerDelegate>
@end

@implementation CBNavigationController

- (void)viewDidLoad
{
  __weak CBNavigationController *weakSelf = self;

  if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
  {
    self.interactivePopGestureRecognizer.delegate = weakSelf;
    self.delegate = weakSelf;
  }
}

// Hijack the push method to disable the gesture

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
  if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
    self.interactivePopGestureRecognizer.enabled = NO;

  [super pushViewController:viewController animated:animated];
}

#pragma mark UINavigationControllerDelegate

- (void)navigationController:(UINavigationController *)navigationController
       didShowViewController:(UIViewController *)viewController
                    animated:(BOOL)animate
{
  // Enable the gesture again once the new controller is shown

  if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
    self.interactivePopGestureRecognizer.enabled = YES;
}

编辑。当用户尝试在根视图控制器上向左滑动时，添加了对问题的修复：

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {

    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)] &&
        self.topViewController == [self.viewControllers firstObject] &&
        gestureRecognizer == self.interactivePopGestureRecognizer) {

        return NO;
    }

    return YES;
}

答案 9 :(得分：1)

RootView 

override func viewDidAppear(_ animated: Bool) {
    self.navigationController?.interactivePopGestureRecognizer?.isEnabled = false
}

ChildView 

override func viewDidLoad() {
    self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true
    self.navigationController?.interactivePopGestureRecognizer?.delegate = self
} 

extension ChildViewController: UIGestureRecognizerDelegate {}

答案 10 :(得分：1)

使用此逻辑可保持启用或禁用滑动手势。

- (void)navigationController:(UINavigationController *)navigationController
       didShowViewController:(UIViewController *)viewController
                    animated:(BOOL)animate
{
    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)])
    {
        if (self.navigationController.viewControllers.count > 1)
        {
            self.navigationController.interactivePopGestureRecognizer.enabled = YES;
        }
        else
        {
            self.navigationController.interactivePopGestureRecognizer.enabled = NO;
        }
    }
}

答案 11 :(得分：0)

我遇到了类似的问题，我将当前视图控制器指定为交互式弹出手势的委托，但会在推送的任何视图或导航堆栈中视图下方的视图中中断手势。我解决这个问题的方法是在-viewDidAppear中设置委托，然后在-viewWillDisappear中将其设置为nil。这使我的其他观点能够正常运作。

答案 12 :(得分：0)

想象一下，我们正在使用Apple的默认主/详细项目模板，其中master是一个表视图控制器，点击它将显示详细视图控制器。

我们想要自定义详细视图控制器中显示的后退按钮。这是自定义后退按钮的image，image color，text，文本颜色和font的方法。

要全局更改图像，图像颜色，文本颜色或字体，请在创建任何视图控制器之前将以下内容放在名为的位置（例如application:didFinishLaunchingWithOptions:是一个好地方）。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    UINavigationBar* navigationBarAppearance = [UINavigationBar appearance];

    // change the back button, using default tint color
    navigationBarAppearance.backIndicatorImage = [UIImage imageNamed:@"back"];
    navigationBarAppearance.backIndicatorTransitionMaskImage = [UIImage imageNamed:@"back"];

    // change the back button, using the color inside the original image
    navigationBarAppearance.backIndicatorImage = [[UIImage imageNamed:@"back"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    navigationBarAppearance.backIndicatorTransitionMaskImage = [UIImage imageNamed:@"back"];

    // change the tint color of everything in a navigation bar
    navigationBarAppearance.tintColor = [UIColor greenColor];

    // change the font in all toolbar buttons
    NSDictionary *barButtonTitleTextAttributes =
    @{
      NSFontAttributeName: [UIFont fontWithName:@"HelveticaNeue-Light" size:12.0],
      NSForegroundColorAttributeName: [UIColor purpleColor]
      };

    [[UIBarButtonItem appearance] setTitleTextAttributes:barButtonTitleTextAttributes forState:UIControlStateNormal];

    return YES;
}

注意，您可以使用appearanceWhenContainedIn:更好地控制哪些视图控制器受这些更改的影响，但请记住，您无法传递[DetailViewController class]，因为它包含在UINavigationController中，而不是你的DetailViewController。这意味着如果您想要更多地控制受影响的内容，则需要继承UINavigationController。

要自定义特定后退按钮项的文本或字体/颜色，必须在 MasterViewController （而不是DetailViewController！）中执行此操作。这似乎不直观，因为按钮出现在DetailViewController上。但是，一旦您了解自定义它的方法是通过在navigationItem上设置属性，它就会变得更有意义。

- (void)viewDidLoad { // MASTER view controller
    [super viewDidLoad];

    UIBarButtonItem *buttonItem = [[UIBarButtonItem alloc] initWithTitle:@"Testing"
                                                                   style:UIBarButtonItemStylePlain
                                                                  target:nil
                                                                  action:nil];
    NSDictionary *barButtonTitleTextAttributes =
    @{
      NSFontAttributeName: [UIFont fontWithName:@"HelveticaNeue-Light" size:12.0],
      NSForegroundColorAttributeName: [UIColor purpleColor]
      };
    [buttonItem setTitleTextAttributes:barButtonTitleTextAttributes forState:UIControlStateNormal];
    self.navigationItem.backBarButtonItem = buttonItem;
}

注意：在设置self.navigationItem.backBarButtonItem之后尝试设置titleTextAttributes似乎不起作用，因此必须在将值赋给此属性之前设置它们。

答案 13 :(得分：0)

创建一个'TTNavigationViewController'类，它是'UINavigationController'的子类，并在storyboard / class中创建此类的现有导航控制器，类中的示例代码 - 

    class TTNavigationViewController: UINavigationController, UIGestureRecognizerDelegate {

override func viewDidLoad() {
    super.viewDidLoad()
    self.setNavigationBarHidden(true, animated: false)

    // enable slide-back
    if self.responds(to: #selector(getter: UINavigationController.interactivePopGestureRecognizer)) {
        self.interactivePopGestureRecognizer?.isEnabled = true
        self.interactivePopGestureRecognizer?.delegate  = self
    }
}

func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}}
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