在 UINavigationController 中自定义 UITabBarItem答案

【问题标题】：Customize UITabBarItem in UINavigationController在 UINavigationController 中自定义 UITabBarItem
【发布时间】：2014-05-13 14:37:05
【问题描述】：

如何更改 UITabBarItem 的背景颜色？我需要这样的东西：

（钱包下的颜色）

【问题讨论】：

标签： ios uinavigationcontroller uitabbaritem

【解决方案1】：

添加图片

    UITabBarController *tabController = (UITabBarController *)self.window.rootViewController;

    //tab1
    UIImage *selectedImage = [UIImage imageNamed:@"home-tab-selected"];
    UIImage *unselectedImage = [UIImage imageNamed:@"home2-tab"];
    MyTabBar *tabBar = (MyTabBar *)tabController.tabBar;
    UITabBarItem *item1 = [tabBar.items objectAtIndex:0];
    [item1 setFinishedSelectedImage:selectedImage withFinishedUnselectedImage:unselectedImage];

    //tab2
    selectedImage = [UIImage imageNamed:@"customers-tab-selected"];
    unselectedImage = [UIImage imageNamed:@"customers-tab"];
    UITabBarItem *item2 = [tabBar.items objectAtIndex:1];
    [item2 setFinishedSelectedImage:selectedImage withFinishedUnselectedImage:unselectedImage];

    //tab3
    selectedImage = [UIImage imageNamed:@"maps-tab-selected"];
    unselectedImage = [UIImage imageNamed:@"maps-tab"];
    UITabBarItem *item3 = [tabBar.items objectAtIndex:2];
    [item3 setFinishedSelectedImage:selectedImage withFinishedUnselectedImage:unselectedImage];

    //tab4
    selectedImage = [UIImage imageNamed:@"reports-tab-selected"];
    unselectedImage = [UIImage imageNamed:@"reports-tab"];
    UITabBarItem *item4 = [tabBar.items objectAtIndex:3];
    [item4 setFinishedSelectedImage:selectedImage withFinishedUnselectedImage:unselectedImage];

    //tab5
    selectedImage = [UIImage imageNamed:@"orders-tab-selected"];
    unselectedImage = [UIImage imageNamed:@"orders-tab"];
    UITabBarItem *item5 = [tabBar.items objectAtIndex:4];
    [item5 setFinishedSelectedImage:selectedImage withFinishedUnselectedImage:unselectedImage];


    if ([tabBar respondsToSelector:@selector(setBackgroundImage:)])
    {
        // ios 5 code here
        [tabBar setBackgroundImage:[UIImage imageNamed:@"tab-bg"]];

    }

【讨论】：

【解决方案2】：

看看UITabbarItem的外观代理，特别是-selectedImage(doc)方法。请注意，在 iOS7 中，大多数图像都呈现为模板（我不知道在标签栏项目中），因此您应该指定它们的呈现模式。
类似的东西：

[[UIImage imageNamed:@"wallet"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

这些方法在 iOS7 上是安全的，如果您需要在较低的目标上部署，最好检查它们是否可用，否则您的应用会崩溃。

【讨论】：