如何在ios 6和ios 7中设置选项卡项的图像

Question

如何在ios 6和ios 7中设置选项卡项的图像。我的选项卡仅在ios 7中运行，因为ios 6中没有运行imageWithRenderingMode方法。如何设置在ios 6和7中运行的选项卡栏项。谢谢。这是我的密码。

 UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController;
 UITabBar *tabBar = tabBarController.tabBar;
 UITabBarItem *tabBarItem1 = [tabBar.items objectAtIndex:0];
 UITabBarItem *tabBarItem2 = [tabBar.items objectAtIndex:1];
 UITabBarItem *tabBarItem3 = [tabBar.items objectAtIndex:2];
 UITabBarItem *tabBarItem4 = [tabBar.items objectAtIndex:3];

 tabBarItem1.title = @"Phim mới";
 tabBarItem2.title = @"Xem phim";
 tabBarItem3.title = @"GS Xoay";
 tabBarItem4.title = @"Về chúng tôi";

 [tabBarItem1 setImage:[[UIImage imageNamed:@"ic1.jpg"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];

 [tabBarItem2 setImage:[[UIImage imageNamed:@"ic2.jpg"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];

 [tabBarItem3 setImage:[[UIImage imageNamed:@"ic3.jpg"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];

 [tabBarItem4 setImage:[[UIImage imageNamed:@"ic4.jpg"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
 return YES;

Answer 1

您需要检查该方法在运行时是否存在：

UIImage *image1 = [UIImage imageNamed:@"ic1.jpg"];
if ([image1 respondsToSelector:@selector(imageWithRenderingMode:)]) {
    [tabBarItem1 setImage:[image1 imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    [tabBarItem2 setImage:[[UIImage imageNamed:@"ic2.jpg"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
    [tabBarItem3 setImage:[[UIImage imageNamed:@"ic3.jpg"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
    [tabBarItem4 setImage:[[UIImage imageNamed:@"ic4.jpg"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
} else {
    [tabBarItem1 setImage:image1];
    [tabBarItem2 setImage:[UIImage imageNamed:@"ic2.jpg"]];
    [tabBarItem3 setImage:[UIImage imageNamed:@"ic3.jpg"]];
    [tabBarItem4 setImage:[UIImage imageNamed:@"ic4.jpg"]];
}

我建议您阅读文档中的"SDK兼容性指南“。