ios - 在 'window' 类型的对象上找不到属性 'CustomTabBar'

Question

我想做的是在我的 iOS 应用程序中自定义 UITabBarItem 的文本和图像。我想我会通过使用 CustomTabBar 类子类化 UITabBarController 来做到这一点。

当我尝试使用以下代码执行此操作时，我收到一条错误消息:在“CustomTabBar”类型的对象上找不到属性“window”。如何正确地子类化 UITabBarController 以便我可以自定义文本和图像？

CustomTabBar.h:

#import <UIKit/UIKit.h>
#import <Parse/Parse.h>
#import <Parse/PFCloud.h>

@interface CustomTabBar : UITabBarController

@end

CustomTabBar.m:

#import "CustomTabBar.h"

@interface CustomTabBar ()

@end

@implementation CustomTabBar

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    // Assign tab bar item with titles
    UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController;
    UITabBar *tabBar = tabBarController.tabBar;
    UITabBarItem *tabBarItem1 = [tabBar.items objectAtIndex:0];
    UITabBarItem *tabBarItem2 = [tabBar.items objectAtIndex:1];

    tabBarItem1.title = @"Search";
    tabBarItem2.title = @"MatchCenter";
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Answer 1

您发布的代码在您的标签栏 Controller 子类中，因此标签栏 Controller 只是“ self ”。

- (void)viewDidLoad {
    [super viewDidLoad];

    UITabBar *tabBar = self.tabBar;
    UITabBarItem *tabBarItem1 = [tabBar.items objectAtIndex:0];
    UITabBarItem *tabBarItem2 = [tabBar.items objectAtIndex:1];

    tabBarItem1.title = @"Search";
    tabBarItem2.title = @"MatchCenter";
}