如何在启动时设置标签栏标题或AppDelegates
。我有5个Tab Bar Item
,其中4个嵌入在Navigation Controller
中,1个没有,只有tab bar item
。请参阅下面的图片
#import "AppDelegate.h"
@interface ProfileChgLang (){
AppDelegate *appDelegate;
NSString *sLanguage;
}
- (IBAction)btnChinese:(id)sender {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:@"CN" forKey:@"txtLanguage"];
[(AppDelegate*)[UIApplication sharedApplication].delegate setupTabBar];
//UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
//==== Is the following correct? =====
UITabBarController * tabBarController = (UITabBarController*)[[[UIApplication sharedApplication] keyWindow] rootViewController];
[self presentViewController:tabBarController animated:YES completion:nil];
}
//====================================
- (void)setupTabBar {
//===Should be this
UITabBarController * tabBarController = (UITabBarController*)[self.window rootViewController];
//===Or this
UITabBarController * tabBarController = (UITabBarController*)[[[UIApplication sharedApplication] keyWindow] rootViewController];
if(tabBarController != nil) {
((UIViewController*)[tabBarController.viewControllers objectAtIndex:1]).tabBarItem.title = @"Your desired Title";
}
答案 0 :(得分:2)
任何UIViewController
都有此属性tabBarItem
,因为它是UIViewController
的扩展名,所以您只需要获取viewController并设置他的tabBarItem.title
property =“your desiredTitle”< / p>
Objective-C代码
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[self setupTabBar];
// Override point for customization after application launch.
return YES;
}
- (void)setupTabBar {
UITabBarController * tabBarController = (UITabBarController*)[self.window rootViewController];
if(tabBarController != nil) {
((UIViewController*)[tabBarController.viewControllers objectAtIndex:3]).tabBarItem.title = @"YourDesiredTitle";
}
}
Swift Code
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
//Whatever you have here
self.setupTabBar()
return true
}
func setupTabBar() {
if let tabBarController = self.window?.rootViewController as? UITabBarController {
if let navigationsControllers = tabBarController.viewControllers as? [UIViewController] {
navigationsControllers[3].tabBarItem.title = "YourTitle"
}
}
}
如果您想从代码中的任何位置调用此方法,则必须