Xamarin IOS：在共享窗口中更改色调颜色

Question

我正在使用此代码在 Xamarin IOS 中进行共享：

public void Share(string title, string content)
    {
        if (UIApplication.SharedApplication.KeyWindow == null || UIApplication.SharedApplication.KeyWindow.RootViewController == null)
            return;

        if (string.IsNullOrEmpty(title) || string.IsNullOrEmpty(content))
            return;

        var rootController = UIApplication.SharedApplication.KeyWindow.RootViewController;
        var imageToShare = UIImage.FromBundle("icon_120.png");
        var itemsToShare = new NSObject[] { new NSString(content), imageToShare };
        var shareStatusController = new UIActivityViewController(itemsToShare, null)
        {
            Title = title
        };
        //shareStatusController.NavigationController.NavigationBar.TintColor = UIColor.Black;
        //rootController.NavigationController.NavigationBar.TintColor = UIColor.Black;
        //shareStatusController.NavigationBar.TintColor = UIColor.FromRGB(0, 122, 255);

        rootController.PresentViewController(shareStatusController, true, null);
        Mvx.Resolve<IAnalyticsService>().LogEvent("Share button clicked.");
    }

当我选择邮件时，我被重定向到这里http://take.ms/3KE4F。但是取消和发送按钮的颜色是白色的（在 NavigationBar 中）。如何更改此按钮的文本颜色？

我找到了文章 Cannot set text color of Send and Cancel buttons in the mail composer when presented from the UIActivityViewController in iOS7。但不知道如何使用 Xamarin 应用它。

感谢您的帮助。

Answer 1

试试这个：

public void Share(string title, string content)
{
    if (UIApplication.SharedApplication.KeyWindow == null || UIApplication.SharedApplication.KeyWindow.RootViewController == null)
        return;

    if (string.IsNullOrEmpty(title) || string.IsNullOrEmpty(content))
        return;
    //Share Barbutton tint
    UIBarButtonItem.AppearanceWhenContainedIn (new [] {typeof(UINavigationBar)}).TintColor = UIColor.Cyan;

    var rootController = UIApplication.SharedApplication.KeyWindow.RootViewController;
    var imageToShare = UIImage.FromBundle("icon_120.png");
    var itemsToShare = new NSObject[] { new NSString(content), imageToShare };
    var shareStatusController = new UIActivityViewController(itemsToShare, null)
    {
        Title = title
    };

    shareStatusController.CompletionHandler += (NSString arg1, bool arg2) => {
            // Set it back to old theme theme
            UIBarButtonItem.AppearanceWhenContainedIn (new [] {typeof(UINavigationBar)}).TintColor = UIColor.White;
    };

    rootController.PresentViewController(shareStatusController, true, null);
    Mvx.Resolve<IAnalyticsService>().LogEvent("Share button clicked.");
}

您基本上在呈现控制器之前设置按钮色调，然后将其设置回完成处理程序。