1.拨打电话：
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://68979"]]; //直接拨打 [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"telprompt://68979"]]; //弹出确订提示
2.调用Safari打开网址:
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://www.baidu.com"]];
3.发送邮件：
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto://[email protected]"]];
4.发送短信：
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"sms://68979"]];
5.打开Appstore:
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"itms-apps://itunes.apple.com/us/app/id%@", AppID]]];
IOS 8开始支持跳转到应用的设置页：
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
IOS5.1以后已经不支持如下方式的跳转：
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=WIFI"]];
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
INTERNET_TETHERING Internet_tethering — prefs:root= INTERNET_TETHERING
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