如何在iOS 5中刪除UITabbaritem的漸變/投影

Question

使用iOS 5，有UI外觀，是否可以輕松刪除漸變？

我這樣做是為了自定義我的tabbar，可以做些什么來刪除漸變？

謝謝閱讀

-(void)UIAppearances
{
    //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];   


        //nav bar
        [[UINavigationBar appearance] setTitleTextAttributes: 
         [NSDictionary dictionaryWithObjectsAndKeys:  
          [UIFont fontWithName:@"Rokkitt" size:28.0],
          UITextAttributeFont,
          nil]];
    }
    else {
        //iOS 4.whatever and below
        [self.tabBarController.tabBar insertSubview:imageView atIndex:0];

    }   

    [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackOpaque animated:NO];

}

Answer 1

UITabBar可以拍攝圖像並使用其Alpha通道（不透明度）來構建選定/未選定的圖像，或者將兩個處理過的圖像按原樣使用。

您必須使用setFinishedSelectedImage:withFinishedUnselectedImage:將您自己的圖像提供給UITabBarItem setFinishedSelectedImage:withFinishedUnselectedImage: . 除了使用UITabBar的selectedImageTintColor外觀屬性更改漸變的顏色之外，沒有其他方法可以影響它對圖像的處理。