如何在选定的 UITabBar 项目上叠加？

Posted 2023-02-23

【中文标题】如何在选定的 UITabBar 项目上叠加？

【英文标题】：how to have a overlay on top of a select UITabBar item?

【发布时间】：2011-11-06 15:15:36

【问题描述】：

有人知道如何在所选项目的顶部添加额外的叠加层吗？

后台在应用委托中完成。

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"navbar_bgrd.png"]];

if ([[[UIDevice currentDevice] systemVersion] floatValue] > 4.9) 
    //ios 5
    [self.tabBarController.tabBar insertSubview:imageView atIndex:1];

else 
    //iOS 4.whatever and below
    [self.tabBarController.tabBar insertSubview:imageView atIndex:0];

选中

未选中

【参考方案1】：

IOS 5 修复，UIappearance 功能

 //set the background of tab bar
    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"navbar_bgrd.png"]];

    if ([[[UIDevice currentDevice] systemVersion] floatValue] > 4.9) 
        //iOS 5
        //[self.tabBarController.tabBar insertSubview:imageView atIndex:1];

        [[UITabBar appearance] setBackgroundImage:[UIImage imageNamed:@"navbar_bgrd.png"]];
        [[UITabBar appearance] setSelectionIndicatorImage:
         [UIImage imageNamed:@"navbaractive.png"]];

        [[UITabBarItem appearance] setTitleTextAttributes:
         [NSDictionary dictionaryWithObjectsAndKeys:
          [UIColor colorWithRed:75.0/255.0 green:75.0/255.0 blue:75.0/255.0 alpha:1.0], UITextAttributeTextColor, 
          [UIColor clearColor], UITextAttributeTextShadowColor, 
          [NSValue valueWithUIOffset:UIOffsetMake(0, 1)], UITextAttributeTextShadowOffset, 
          nil] forState:UIControlStateNormal];

        [[UITabBarItem appearance] setTitleTextAttributes:
         [NSDictionary dictionaryWithObjectsAndKeys:
          [UIColor whiteColor], UITextAttributeTextColor, 
          [UIColor clearColor], UITextAttributeTextShadowColor, 
          [NSValue valueWithUIOffset:UIOffsetMake(0, 1)], UITextAttributeTextShadowOffset, 
          nil] forState:UIControlStateSelected];