ios7标签栏控制器的问题

Question

嗨，我正在将我的应用程序从 ios 6.1 迁移到 7，该应用程序包含一个标签栏控制器，在 ios6 上运行良好，但是当我在 ios 7 上运行它时，5 个标签栏项目中有 4 个不显示所选图像，它的很奇怪，因为一个显示正确，而其他显示不正确，正在使用情节提要，无法使用“imageWithRenderingMode：”，因为我仍在 xcode 4.6 上执行此操作，所以我想仅在 xcode 4.6 中对其进行纠正并成为可以在ios7上运行，tabbarcontroller的代码给出，如有错误请见谅..

- (void)customizeTabbarBackgroundImages:(UITabBarController *)tabbarController
{
    //background of tabbar
    [tabbarController.tabBar setBackgroundImage:[UIImage imageNamed:@"tabbarBackground.png"]];

    //background for selected item
    [[tabbarController tabBar] setSelectionIndicatorImage:[UIImage imageNamed:@"tabbar-selection-background.png"]];

    //keep the item at index 2 as selected item
    tabbarController.selectedIndex = 2;
}


- (void)customizeTabbarItemImages:(UITabBarController *)tabbarController
{
    {
        //Index - Favourites
        [[tabbarController.tabBar.items objectAtIndex:0] setFinishedSelectedImage:[UIImage imageNamed:@"tabbar-favourites-icon-down.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"tabbar-favourites-icon.png"]];

        //Index - Search
        [[tabbarController.tabBar.items objectAtIndex:1] setFinishedSelectedImage:[UIImage imageNamed:@"tabbar-search-icon-down.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"tabbar-search-icon.png"]];

        //Index - Icon
        [[tabbarController.tabBar.items objectAtIndex:2] setFinishedSelectedImage:[UIImage imageNamed:@"tabbar-random-button"]withFinishedUnselectedImage:[UIImage imageNamed:@"tabbar-random-button"]];

        //Index - Profile
        [[tabbarController.tabBar.items objectAtIndex:3] setFinishedSelectedImage:[UIImage imageNamed:@"tabbar-profile-icon-down.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"tabbar-profile-icon.png"]];

        //Index - Settings
        [[tabbarController.tabBar.items objectAtIndex:4] setFinishedSelectedImage:[UIImage imageNamed:@"tabbar-settings-icon-down.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"tabbar-settings-icon.png"]];
    }
}

Answer 1

您想要使用 imageWithRenderingMode 是正确的。只需执行以下操作即可将 UIImage 调整为与两个 ios 版本兼容：

UIImage *tabImage = [UIImage imageNamed:@"tabBar.png"];

if ([UIImage instancesRespondToSelector:@selector(imageWithRenderingMode:)]) {
    tabImage = [segmentImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
}