在iOS7之前如果需要隐藏StatusBar，比较简单，直接在AppDelegate.cs中使用如下代码就可以进行隐藏：

UIApplication.SharedApplication.StatusBarHidden = true;

但这段代码在iOS7中却无法实现StatusBar隐藏，而是将StatusBar透明显示。经过在Xamarin网站查询向导，具体方法是为UIViewController增加一个重写方法，

public override bool PrefersStatusBarHidden ()
{
    return true;
}

这样就可以进行隐藏了，完成后效果如下图所示：

在实际代码编写的时候为了方便起见，可以建立一个ViewController的类，继承UIViewController类，增加 StatusBarHidder的方法，以后再新增UIViewController的时候都继承ViewController即可。具体代码如下：

using System;
using System.Drawing;

using MonoTouch.CoreFoundation;
using MonoTouch.UIKit;
using MonoTouch.Foundation;

namespace Com.imStudio.iOSLibrarys
{
    [Register("ViewController")]
    public class ViewController : UIViewController
    {
        public Boolean StatusBarHidder { get; set; }

        public ViewController()
        {
        }

        public override void DidReceiveMemoryWarning()
        {
            // Releases the view if it doesn't have a superview.
            base.DidReceiveMemoryWarning();

            // Release any cached data, images, etc that aren't in use.
        }

        public override bool PrefersStatusBarHidden()
        {
            return this.StatusBarHidder;
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            // Perform any additional setup after loading the view
        }
    }
}

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By博客园宋海鹏