导航栏上的自定义后退按钮

Question

在我的应用程序中有很多UIViewControllers 和UINavigationControllers。 UINavigationBar 上必须有一个“返回”按钮和一个“主页”UIButton。所有这些都可以正常工作。

但是我的一些UIViewControllers名字很长，有时候留的地方太小了。我正在尝试用自定义的“后退”替换“后退”按钮的原始标签（它显示上一个视图的标题），但无论我尝试了什么都没有用：

// Title didn't change
[self.navigationItem.backBarButtonItem setTitle:@"Back"];

// Action didn't set, no response from button ( button didn't do anything )
[self.navigationItem.leftBarButtonItem
   setAction:self.navigationItem.backBarButtonItem.action];

而且我需要“后退”按钮的样式类似于这个问题：Draw custom Back button on iPhone Navigation Bar

Answer 1

试试下面的。它肯定会起作用：

- (void)viewDidLoad {
    [super viewDidLoad];

    UIImage *buttonImage = [UIImage imageNamed:@"back.png"];
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setImage:buttonImage forState:UIControlStateNormal];
    button.frame = CGRectMake(0, 0, buttonImage.size.width, buttonImage.size.height);
    [button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];

    UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:button];
    self.navigationItem.leftBarButtonItem = customBarItem;
    [customBarItem release];
}

- (void)back {
    [self.navigationController popViewControllerAnimated:YES];
}

确保您的资源文件夹中有一个导航栏后退按钮大小的按钮图像，名称为back.png。

如果需要任何其他帮助，请随时联系。

Answer 2

目标： 将 UINavigationBar 上的所有后退按钮自定义为白色图标

步骤： 1.在AppDelete的“didFinishLaunchingWithOptions”方法中：

UIImage *backBtnIcon = [UIImage imageNamed:@"navBackBtn"];

if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")) {
    [UINavigationBar appearance].tintColor = [UIColor whiteColor];
    [UINavigationBar appearance].backIndicatorImage = backBtnIcon;
    [UINavigationBar appearance].backIndicatorTransitionMaskImage = backBtnIcon;
}else{

    UIImage *backButtonImage = [backBtnIcon resizableImageWithCapInsets:UIEdgeInsetsMake(0, backBtnIcon.size.width - 1, 0, 0)];
    [[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage  forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

    [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -backButtonImage.size.height*2) forBarMetrics:UIBarMetricsDefault];
}

2.在普通超级ViewController类的“viewDidLoad”方法中：

 if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")) {
        UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@""
                                                                     style:UIBarButtonItemStylePlain
                                                                    target:nil
                                                                    action:nil];
        [self.navigationItem setBackBarButtonItem:backItem];
    }else{
        //do nothing
    }

Answer 3

试试这个

UIBarButtonItem *backBarBtnItem = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:self action:@selector(popViewController)];
[self.navigationItem setBackBarButtonItem:backBarBtnItem];

- (void)popViewController
{
    [self.navigationController popViewControllerAnimated:YES];
}

Answer 4

如果你像我一样到处这样做，你最好将 Anil 的解决方案作为一个类别来实现：

@interface UIViewController (CustomBackButton)

- (void) setCustomBackButton;
- (void) back;

@end

@implementation UIViewController (CustomBackButton)

- (void) setCustomBackButton
{
    UIImage *buttonImage = [UIImage imageNamed:@"back.png"];
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setImage:buttonImage forState:UIControlStateNormal];
    button.frame = CGRectMake(0, 0, buttonImage.size.width, buttonImage.size.height);
    [button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:button];
    self.navigationItem.leftBarButtonItem = customBarItem;
}

- (void) back
{
    [self.navigationController popViewControllerAnimated:YES];
}

@end

Answer 5

更简单：

UIBarButtonItem *barBtnItem = 
  [[UIBarButtonItem alloc]initWithTitle:@"Indietro"
                                  style:UIBarButtonItemStyleBordered
                                 target:self
                                 action:@selector(pop)];
[barBtnItem setTintColor:[UIColor whiteColor]];
self.navigationItem.leftBarButtonItem = barBtnItem;

Answer 6

假设您有两个控制器 - Controller1 和 Controller2。 Controller2 从 Controller1 推送。所以在将Controller2从Controller1推到navigationController之前

Controller2 *controller2 = [[[Controller2 alloc]  init]autorelease];
self.navigationItem.hidesBackButton = YES;   

现在，在Controller2的viewDidLoad:方法中，添加如下sn-p

UIBarButtonItem *backBarButtonItem =[[[UIBarButtonItem alloc]initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:self action:@selector(goBackToAllPets:)]autorelease];
self.navigationItem.leftBarButtonItem = backBarButtonItem;

并且在 backButtonClicked 方法中，您可以执行您想要的检查。