ios - 标签栏图标显示不正确

Question

在我的应用程序中有一个带有四个选项卡的标签栏。我将标签栏图标资源 (50x50) 添加到 Images.xcassets 中。但是我发现其中一个icosn显示不正确，如下图:

- (void)customTabBarItems{
    self.tabBar.superview.backgroundColor = [UIColor whiteColor];

    NSArray *items = self.tabBar.items;
    NSArray *normalImgs = @[@"tab_home_normal",@"tab_message_normal",@"tab_order_normal",@"tab_userCenter_normal"];
    NSArray *selectedImgs = @[@"tab_home_selected",@"tab_message_selected",@"tab_order_selected",@"tab_userCenter_selected"];

    for (NSInteger i = 0; i < items.count; i++) {
        UITabBarItem *item = [items objectAtIndex:i];
        NSString *title = titleArr[i];
        UIImage *normalImg = [UIImage imageNamed:normalImgs[i]];
        UIImage *selectImg = [UIImage imageNamed:selectedImgs[i]];
        item.title = title;
        if (isIOS7Later) {
            item.image = normalImg;
            item.selectedImage = selectImg;
        }
        else{
            [item setFinishedSelectedImage:selectImg withFinishedUnselectedImage:normalImg];
        }
    }
}

//set tint color 

- (void)_customAppearance
{
    if (isIOS7Later)
    {
        [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent animated:NO];
    }

    UIColor * color = [UIColor whiteColor];
    NSDictionary * dict = [NSDictionary dictionaryWithObject:color forKey:UITextAttributeTextColor];
    [[UINavigationBar appearance] setTitleTextAttributes:dict];

    if (isIOS7Later)
    {
        [[UITabBar appearance] setTintColor:BGCOLOR(21.0, 170.0, 255.0, 1.0)];
    }
    else
    {
        NSDictionary *textAttributesNormal = @{UITextAttributeTextColor: BGCOLOR(179, 179, 179, 1)};
        NSDictionary *textAttributesSelected = @{UITextAttributeTextColor:BGCOLOR(0, 154, 255, 1)};
        [[UITabBar appearance] setBackgroundImage:[UIImage imageNamed:@"tab_select_image"]];
        [[UITabBarItem appearance] setTitleTextAttributes:textAttributesNormal forState:UIControlStateNormal];
        [[UITabBarItem appearance] setTitleTextAttributes:textAttributesSelected forState:UIControlStateSelected];
        [[UITabBar appearance] setSelectedImageTintColor:[UIColor whiteColor]];
        [[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:@"tab_select_image"]];
    }

    [SVProgressHUD setForegroundColor:BGCOLOR(0, 135.0, 231, 1)];
    [SVProgressHUD setDefaultMaskType:SVProgressHUDMaskTypeBlack];
}

//Images.xcassets

当我把第一个图标换成另一个时，好像没问题，但我想用这个:

Answer 1

问题似乎出在色调上。 Tint color 改变图像可见像素的颜色，所以它通常用于改变具有透明度的图像的颜色。好像你的图像没有透明背景，所以色调颜色使它全蓝。请检查您的图像来源。如果您的图像很好，另一种可能的解决方案 - 在设置图像之前使用图像渲染模式:

UIImage *toSet = [yourImage  imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];