Here is instructions how to open specific system settings page from your iOS application. It works from iOS version 8. I create small demo project which you can check, it's available on GitHub.

Project setup

• First set bundle URL type to allow handle prefs URL scheme by your application
• In XCode open project settings: Targets - ApplicationTarget - Info - URL Types
• Or add CFBundleURLTypes key to application's info.plist

<key>CFBundleURLTypes</key>
<array>
    <dict>
        <key>CFBundleTypeRole</key>
        <string>Editor</string>
        <key>CFBundleURLSchemes</key>
        <array>
            <string>prefs</string>
        </array>
    </dict>
</array>

• Now you can use UIApplication.sharedApplication().openURL(url) to open desired setting page

let app = UIApplication.sharedApplication()
let url = NSURL(string: "prefs:root=General&path=About")!
 
if app.canOpenURL(url) {
    app.openURL(url)
}

• For available URLs check Links section below
• You can use URL string UIApplicationOpenSettingsURLString to open current application settings if application has any

Links

• URL Schemes
• StackOverflow with URL scheme definition
• Another StackOverflow