iOS app-open system settings URL

iOS---Invoke the function in the system "settings" (GO)

After installation, the first time you run the software, the system will prompt the user whether to allow the software to obtain the current location, if the user does not allow, then the runtime system will not be prompted to set up, this is inconvenient, there is a solution is to give the user an option to bring up the iphone "Settings" location service option, manually set by the user , call the system "settings" to locate the service-related code as follows:

-(Ibaction) btnsetting: (ID) sender{
Nsurl*url=[nsurl urlwithstring:@ "Prefs:root=location_services"];
[[UIApplication sharedapplication] openurl:url];
}

There are other commands for invoking system settings:
Www.2cto.com

[Font=]
About-prefs:root=general&path=about
Accessibility-prefs:root=general&path=accessibility
Airplane Mode On-prefs:root=airplane_mode
Auto-lock-prefs:root=general&path=autolock
Brightness-prefs:root=brightness
Bluetooth-prefs:root=general&path=bluetooth
Date & Time-prefs:root=general&path=date_and_time
Facetime-prefs:root=facetime
General-prefs:root=general
Keyboard-prefs:root=general&path=keyboard
Icloud-prefs:root=castle
ICloud Storage & Backup-prefs:root=castle&path=storage_and_backup
International-prefs:root=general&path=international
Location Services-prefs:root=location_services
Music-prefs:root=music
Music Equalizer-prefs:root=music&path=eq
Music Volume Limit-prefs:root=music&path=volumelimit
Network-prefs:root=general&path=network
Nike + ipod-prefs:root=nike_plus_ipod
Notes-prefs:root=notes
notification-prefs:root=notifications_id
Phone-prefs:root=phone
Photos-prefs:root=photos
Profile-prefs:root=general&path=managedconfigurationlist
Reset-prefs:root=general&path=reset
Safari-prefs:root=safari
Siri-prefs:root=general&path=assistant
Sounds-prefs:root=sounds
Software Update-prefs:root=general&path=software_update_link
Store-prefs:root=store
Twitter-prefs:root=twitter
Usage-prefs:root=general&path=usage
Vpn-prefs:root=general&path=network/vpn
Wallpaper-prefs:root=wallpaper
Wi-fi-prefs:root=wifi

iOS app-open system settings URL