在Content中添加ToolbarItem 中默认都是显示在右边 ，现在需要第二个显示在左边，需要添加Custom Renderer 来实现
[assembly: ExportRendererAttribute(typeof(ContentPage), typeof(CustomContentPageRenderer))]
namespace AlertControllerDemo.iOS.Renderer
{
public class CustomContentPageRenderer : PageRenderer
{
public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
// Did this, because Xamarin.Forms couldn't set HasBackButton correct.
// ViewController.ParentViewController.NavigationItem.SetHidesBackButton(!((ChangePasswordScreen)this.Element).HasBackButton, false);
if (NavigationController == null)
return;
var navigationItem = NavigationController.TopViewController.NavigationItem;
var leftNativeButtons = (navigationItem.LeftBarButtonItems ?? new UIBarButtonItem[] { }).ToList();
var rightNativeButtons = (navigationItem.RightBarButtonItems ?? new UIBarButtonItem[] { }).ToList();
if (rightNativeButtons.Count > 1)
{
var nativeItem = rightNativeButtons.Last();
rightNativeButtons.Remove(nativeItem);
leftNativeButtons.Add(nativeItem);
}
navigationItem.RightBarButtonItems = rightNativeButtons.ToArray();
navigationItem.LeftBarButtonItems = leftNativeButtons.ToArray();
}
}
}
效果：
