c# - 如何在 ios 中以编程方式打开设置

Question

我正在搜索 How to open settings programmatically 的 Xamarin 实现

Vito-ziv为 objective-c 回答了它 - 在 Xamarin Studio 的 C# for iOS 中执行此操作的正确方法是什么？

Answer 1

对于当前设备，这仅在 ios8 中可用(在撰写本文时 ios9 不可用)(在 ios5 之前显然是可能的 - 请参阅 this blog post 中的 Adrian Stevens at Xamarin - 向他大声疾呼以获取此答案的灵感)

要在 ios8 中做到这一点，我是这样做的:

var settingsString = UIKit.UIApplication.OpenSettingsUrlString;
            var url = new NSUrl (settingsString);
            UIApplication.SharedApplication.OpenUrl (url);

上面的代码是通过 UIAlertView 点击中的委托(delegate)类从点击事件中调用的。

因为我也支持 ios7，为了处理 ios7 设备，我这样做了，在决定是否呈现 View Controller 时调用 HandleLocationAuthorisation 方法 - ios8 及更高版本的用户可以选择直接转到设置，而ios7 用户必须手动去那里。

下面的这个例子正在检查定位服务，但只要稍加改动就可以很容易地更改为检查其他类型的设置。

public bool HandleLocationAuthorisation () 
{

    if (CLLocationManager.Status == CLAuthorizationStatus.AuthorizedAlways) {
        return true;
    } else {
        UIAlertView uiAlert;  


        //iOS 8 and above can redirect to settings from within the app
        if (UIDevice.CurrentDevice.CheckSystemVersion(8,0)) {
            uiAlert = new UIAlertView 
                ("Location Services Required", 
                    "",
                    null,
                    "Return To App","Open Settings");

            uiAlert.Delegate = new OpenSettingsFromUiAlertViewDelegate();
            uiAlert.Message = "Authorisation to use your location is required to use this feature of the app.";

        //ios7 and below has to go there manually
        } else {
            uiAlert = new UIAlertView 
                ("Location Services Required", 
                    "Authorisation to use your location is required to use this feature of the app. To use this feature please go to the settings app and enable location services",
                    null,
                    "Ok");
        }
        uiAlert.Show ();
        return false;
    }

}

为了完整起见，这里是上面引用的事件委托(delegate)的代码:

public class OpenSettingsFromUiAlertViewDelegate : UIAlertViewDelegate {

public override void Clicked (UIAlertView alertview, nint buttonIndex)
{

    if (buttonIndex == 1) {
        var settingsString = UIKit.UIApplication.OpenSettingsUrlString;
        var url = new NSUrl (settingsString);
        UIApplication.SharedApplication.OpenUrl (url);
    }
  }
}