ios --- 调用系统"设置"里的功能

//一键打开移动蜂窝网络设置：

NSURL*url=[NSURL URLWithString:@"prefs:root=MOBILE_DATA_SETTINGS_ID"]; 

蜂窝网络：prefs:root=MOBILE_DATA_SETTINGS_ID

http://my.oschina.net/u/2344008/blog/465693

安装后第一次运行软件时，系统会弹出提示用户是否允许软件获取当前位置，如果用户不允许的话，之后运行时系统不会在弹出提示设置，这点很不方便，有个解决办法是给用户一个选项，调出iphone中“设置”定位服务选项，由用户手动设置，调用系统“设置”中定位服务相关代码如下：

-(IBAction)btnSetting:(id)sender{ 
    NSURL*url=[NSURL URLWithString:@"prefs:root=LOCATION_SERVICES"]; 
    [[UIApplication sharedApplication] openURL:url]; 
} 

还有其他调用系统设置的命令：
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用openurl方式打开设置页面

iOS5的SDK现在可以直接打开setting页面了，以往的SDK则不可以。

补充一点，下面的方法是undocument的，所以可能会被reject.

如果你想打开Location Services的setting页面，代码如下：

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=LOCATION_SERVICES"]];

如果想打开Twitter的设置：
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=TWITTER"]];

如果想打开蓝牙的设置：
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=General&path=Bluetooth"]];

当然你还可以打开应用的设置：
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=Apps&path=Your+App+Display+Name"]];