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好了，所以，我想创建一个自定义标签栏。我读过一百篇教程，并下载了一半的示例代码项目，这个问题似乎仍然存在于所有这些项目中。
我真的不想要一个自定义背景，我真正想要的按钮占据整个区域，所以没有背景显示。为什么当使用大小为49像素（视网膜为98像素）的图像作为背景和按钮...标签栏本身被放大并且苹果增加的丑陋光芒是可见的？
这是我使用的代码（在这里发现栈）：
UIImage *selectedImage0 = [UIImage imageNamed:@"transactions_tab_btn_active"];
UIImage *unselectedImage0 = [UIImage imageNamed:@"transactions_tab_btn"];
UIImage *selectedImage1 = [UIImage imageNamed:@"bills_tab_btn_active"];
UIImage *unselectedImage1 = [UIImage imageNamed:@"bills_tab_btn"];
UIImage *selectedImage2 = [UIImage imageNamed:@"messages_tab_btn_active"];
UIImage *unselectedImage2 = [UIImage imageNamed:@"messages_tab_btn"];
UIImage *selectedImage3 = [UIImage imageNamed:@"reports_tab_btn_active"];
UIImage *unselectedImage3 = [UIImage imageNamed:@"reports_tab_btn"];
UITabBar *tabBar = self.tabBarController.tabBar;
UITabBarItem *item0 = [tabBar.items objectAtIndex:0];
UITabBarItem *item1 = [tabBar.items objectAtIndex:1];
UITabBarItem *item2 = [tabBar.items objectAtIndex:2];
UITabBarItem *item3 = [tabBar.items objectAtIndex:3];
UIImageView *tabBarImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tab_bar"]];
if ([[[UIDevice currentDevice] systemVersion] floatValue] < 5) {
[tabBar insertSubview:tabBarImageView atIndex:0];
}else{
[tabBar insertSubview:tabBarImageView atIndex:1];
}
[item0 setFinishedSelectedImage:selectedImage0 withFinishedUnselectedImage:unselectedImage0];
[item1 setFinishedSelectedImage:selectedImage1 withFinishedUnselectedImage:unselectedImage1];
[item2 setFinishedSelectedImage:selectedImage2 withFinishedUnselectedImage:unselectedImage2];
[item3 setFinishedSelectedImage:selectedImage3 withFinishedUnselectedImage:unselectedImage3];
同样，我可以删除背景图片，因为它是对我没有用的，但是没有它，默认的黑色背景的标签酒吧是可见的。两者都不好。请帮助。