斯威夫特 您可以使用以下功能打开蓝牙页面设置App

func openSettingsApp(){
    if let settings = NSURL(string: "prefs:root=Bluetooth") {
        UIApplication.sharedApplication().openURL(settings)
    }
}

同样，这不会打开应用程序的设置。这将打开蓝牙设置应用程序，因为这是深度链接到蓝牙。

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")
})

iOS 10更新

苹果将该方法更改为在主线程上打开async。但是，从现在开始，只能在本机设置中打开应用程序设置。

[[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil];

iOS 9更新

现在可以直接进入子设置菜单。但是，需要创建URL方案。有两种方法:

XCode -你会在目标，信息，URL方案中找到它。然后，输入prefs。 直接添加到*-Info.plist。增加如下内容: <键> CFBundleURLTypes关键> < / < >数组 < dict > <键> CFBundleTypeRole关键> < / <字符串>编辑字符串> < / <键> CFBundleURLSchemes关键> < / < >数组 <字符串>首选项> < /字符串 > < /数组 < / dict > > < /数组

然后代码:

斯威夫特

UIApplication.sharedApplication () .openURL (NSURL(弦:“首选项:根=一般路径=键盘”)!)

objective - c

[eapplication sharedApplication] openURL:[NSURL优先字符串:

您可以使用下面的代码。

[[UIApplication sharedApplication]openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];

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")
}

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")
             }
        }
}