如何自定义UITabBar-选择选项卡时如何更改所选选项卡的图像

如何解决如何自定义UITabBar-选择选项卡时如何更改所选选项卡的图像

|| 选择选项卡栏时如何更改图像。帮帮我，谢谢。     

解决方法

        您可以在此处找到有关如何创建自定义标签栏的信息 http://www.rumexit.co.uk/2010/07/how-to-customise-the-tab-bar-uitabbar-in-an-iphone-application-part-1-of-2/ 您可以按照以下代码设置图像和为UIControlStateNormal和UIControlStateSelected选择的图像

UIImage *btnImage = [UIImage imageNamed:@\"Button_Normal.png\"];
UIImage *btnImageSelected = [UIImage imageNamed:@\"Bouton_Selected.png\"];

self.bouton_tab = [UIButton buttonWithType:UIButtonTypeCustom]; //Setup the button
bouton_tab.frame = CGRectMake(xStart,TABYSTART,TABITEMWIDTH,TABITEMHEIGHT); // Set the frame (size and position) of the button)
[bouton_tab setBackgroundImage:btnImage forState:UIControlStateNormal]; // Set the image for the normal state of the button
[bouton_tab setBackgroundImage:btnImageSelected forState:UIControlStateSelected]; // Set the image for the selected state of the button
[bouton_tab setTag:0]; // Assign the button a \"tag\" so when our \"click\" event is called we know which button was pressed.
[bouton_tab setSelected:true]; // Set this button as selected (we will select the others to false as we only want Tab 1 to be selected initially

希望对您有帮助：)     ,        您可以使用UITabBarControllerDelegate方法

-(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
   if(tabBarController.selectedIndex==0)
   {
      [viewController.tabBarItem setImage:[UIImage imageNamed:@\"home.png\"]];
   }
}

在appDelegate.m文件中使用此代码 并在appDelegate.h文件中添加协议     ,        您可以制作一个自定义标签栏：  1.创建标签栏视图控制器  2.在此VC中放入以下方法：

-(void) addCenterButtonWithImage:(UIImage*)buttonImage highlightImage:(UIImage*)highlightImage
{
    self.button = [UIButton buttonWithType:UIButtonTypeCustom];
    self.button.autoresizingMask = UIViewAutoresizingFlexibleRightMargin |    UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin;
    self.button.frame = CGRectMake(0.0,0.0,buttonImage.size.width,buttonImage.size.height);
    [self.button setBackgroundImage:buttonImage forState:UIControlStateNormal];
    [self.button setBackgroundImage:highlightImage forState:UIControlStateHighlighted];

    self.button.center = self.tabBar.center;

    [self.view addSubview: self.button];

}

在标签栏控制器

viewDidLoad

中以这种方式调用此方法：

- (void)viewDidLoad
{
    [self addCenterButtonWithImage:[UIImage imageNamed:@\"bemobile.png\"] highlightImage:[UIImage imageNamed:@\"bemobileSelected.png\"]];

    [super viewDidLoad];
}

在

highlightImage

中，您传递在选择该选项卡栏项目时将显示的图像的位置     ,        我认为您需要尝试这一方法，希望对您有所帮助， 我已经更改了所选的tabbatitem图片，例如- 在Tabbar Controller委托方法中

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

{
    if([tabBarController selectedIndex] == 0)
    {
        [viewController.tabBarItem setFinishedSelectedImage:[UIImage imageNamed:@\"selected.png\"]withFinishedUnselectedImage:[UIImage imageNamed:@\"unselect.png\"]];
    }    
}

通过此操作，您可以更改图像。 或者，您可以直接在视图控制器中使用init（或ViewWillAppear）方法，例如

        [viewController.tabBarItem setFinishedSelectedImage:[UIImage imageNamed:@\"selected.png\"]withFinishedUnselectedImage:[UIImage imageNamed:@\"unselect.png\"]];