ios Tabbar在didSelectViewController上選擇了索引集圖像

Question

我正在通過編程方式創建一個選項卡欄，選項卡欄正常工作問題是我不知道如何設置所選索引，所選選項卡欄設置為藍色，設置藍色圖像selected，使用了didSelectViewController委托方法，但我不知道如何設置圖像這是使用方法，但我不知道如何設置圖像和顏色

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController

這是我的代碼

-(IBAction)clicka:(id)sender
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    AViewController *viewController1 = [[AViewController alloc] initWithNibName:@"AViewController" bundle:nil];





    BViewController *viewController2 = [[BViewController alloc] initWithNibName:@"BViewController" bundle:nil];



    CViewController *viewController3 = [[CViewController alloc]initWithNibName:@"CViewController" bundle:nil];



    DViewController *viewController4 = [[DViewController alloc]initWithNibName:@"DViewController" bundle:nil];



    [self.navigationController pushViewController:viewController1 animated:YES];



    self.tabBarController = [[UITabBarController alloc] init];



    self.tabBarController.delegate=self;

    self.tabBarController.viewControllers = @[viewController1,viewController2,viewController3,viewController4];



    UINavigationController *navigationController = [[UINavigationController alloc]initWithRootViewController:self.tabBarController];

    UIImageView   *img = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,320,100)];

    img.image=[UIImage imageNamed:@"yellow-bg.png"];

    [self.tabBarController.tabBar addSubview:img];





    UIImageView *imghome=[[UIImageView alloc]initWithFrame:CGRectMake(30.0,5,25,25)];

    imghome.image=[UIImage imageNamed:@"splash-logo.png"];

    [img addSubview:imghome];



    UIImageView *imghome1=[[UIImageView alloc]initWithFrame:CGRectMake(100.0,5,25,25)];

    imghome1.image=[UIImage imageNamed:@"chat-icon.png"];

    [img addSubview:imghome1];



    UIImageView *imghome2=[[UIImageView alloc]initWithFrame:CGRectMake(180.0,5,25,25)];

    imghome2.image=[UIImage imageNamed:@"p-icon.png"];

    [img addSubview:imghome2];

    UIImageView *imghome3=[[UIImageView alloc]initWithFrame:CGRectMake(260.0,5,25,25)];

    imghome3.image=[UIImage imageNamed:@"addddd.png"];

    [img addSubview:imghome3];

    self.window.rootViewController = navigationController;
    [self.window makeKeyAndVisible];


}
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
    NSUInteger selectedIndex = self.tabBarController.selectedIndex;
NSLog(@"%lu",(unsigned long)selectedIndex);
}

請幫我

Answer 1

您可以在UIImage.h中找到渲染模式

- (UIImage *)imageWithRenderingMode:(UIImageRenderingMode)renderingMode

默認情況下，如果將圖像作為tabbarItem附加到選項卡，則更改模式為UIImageRenderingModeAlwaysTemplate，因此為藍色。

設置為tabbaritem之前，應更改圖像渲染模式。

UIImage * originalImage = [UIImage imageNamed:@"chat-icon.png"];
UIImage * selectedBlueImage = [originalImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

選擇選項卡時，將selectedBlueImage設置為imageView。 像：imageview.highlightedImage = selectedBlueImage

Answer 2

我不確定我是否正確理解了您的問題，但是如果要在每個View Controller的每個TabBar部分中分別設置圖像，則可以從每個View Controller類（例如在AViewController.m內部）進行覆蓋：

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {
        //self.tabBarItem.title = @"Title";
        self.tabBarItem.image = [UIImage imageNamed:@"image-name"];
    }

    return self;
}