你可以在iOS 5.0及更高版本上使用这个:这个不再有效。

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs://"]];

添加到接受的答案:(来自苹果开发者文档)当你打开这个字符串(openSettingsURLString)构建的URL时，系统启动设置应用程序，并显示应用程序的自定义设置(如果有的话)。如果你想打开应用的设置，创建你自己的settings。bundle。

斯威夫特3:

guard let url = URL(string: UIApplicationOpenSettingsURLString) else {return}
if #available(iOS 10.0, *) {
  UIApplication.shared.open(url, options: [:], completionHandler: nil)
} else {
  // Fallback on earlier versions
  UIApplication.shared.openURL(url)
}

把这个加到你的课上，

 public class func showSettingsAlert(title:String,message:String,onVC viewController:UIViewController,onCancel:(()->())?){
            YourClass.show2ButtonsAlert(onVC: viewController, title: title, message: message, button1Title: "Settings", button2Title: "Cancel", onButton1Click: {
                if let settingsURL = NSURL(string: UIApplicationOpenSettingsURLString){
                    UIApplication.sharedApplication().openURL(settingsURL)
                }
                }, onButton2Click: {
                    onCancel?()
            })
        }

 public class func show2ButtonsAlert(onVC viewController:UIViewController,title:String,message:String,button1Title:String,button2Title:String,onButton1Click:(()->())?,onButton2Click:(()->())?){
            dispatch_async(dispatch_get_main_queue()) {
                let alert : UIAlertController = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)

                alert.addAction(UIAlertAction(title: button1Title, style:.Default, handler: { (action:UIAlertAction) in
                    onButton1Click?()
                }))

                alert.addAction(UIAlertAction(title: button2Title, style:.Default, handler: { (action:UIAlertAction) in
                    onButton2Click?()
                }))

                viewController.presentViewController(alert, animated: true, completion: nil)
            }
        }

像这样调用，

YourClass.showSettingsAlert("App would like to access camera", message: "App would like to access camera desc", onVC: fromViewController, onCancel: {
  print("canceled")
})

由于openURL(_::)在iOS 10.0之后已被弃用，请使用open(_:options:completionHandler:)代替。

if let settingsUrl = URL(string: UIApplication.openSettingsURLString)  {
        UIApplication.shared.open(settingsUrl, options: [:]) { completed in
             if !completed {
                 print("Failed opening")
             }
        }
}

斯威夫特4

我更喜欢以更安全的方式打开设置，

if let settingUrl = URL(string:UIApplicationOpenSettingsURLString) {

    UIApplication.shared.open(settingUrl)
}
else {
    print("Setting URL invalid")
}