iOS自定义标签栏项目比标签栏更高

Question

好的，我正在尝试创建一个自定义标签栏。我已经阅读了一百个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，我真正希望按钮占据整个区域，以便没有任何背景显示。为什么当使用尺寸为49px（Retina为98px）的图像作为背景和按钮时...标签栏本身是按比例放大的，而Apple添加的丑陋发光是可见的？

这是我使用的代码（在Stack上找到）：

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，我可以删除那个背景图片，因为它对我没用，但没有它，标签栏的默认黑色背景是可见的。两个都不好。 Help.Please。

Answer 1

好吧，我可以帮助你发光。要隐藏它，只需创建一个透明图像并使用它。

UIImage* image = [UIImage imageNamed:@"transparent.png"];
[[UITabBar appearance] setSelectionIndicatorImage:image];