openURL能帮助你运行Maps，SMS，Browser,Phone甚至其他的应用程序。这是Iphone开发中我经常需要用到的一段代码，它仅仅只有一行而已。
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://8004664411"]];
这个程序通过基础的协议支持拨打电话的功能
译者附：
-(IBAction)openMaps {//打开地图
// Where is Apple on the map anyway?
NSString* addressText = @”1 Infinite Loop, Cupertino, CA 95014″;
addressText = [addressText stringByAddingPercentEscapesUsingEncoding: NSASCIIStringEncoding];
NSString* urlText = [NSString stringWithFormat:@"http://maps.google.com/maps?q=%@", addressText];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlText]];
}
//打开地图直接搜索中文位置需要特殊编码，例子如下：
- (IBAction)gotoHospitalMapAction: (id)sednder
{
NSLog(@"gotoHospitalMapAction");
NSString *strHospitalAddress = @"南京市水西门大街文体西路9号";
NSString *strHospitalMap = @"http://maps.google.com/maps?q=";
NSURL *searchMap = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@", strHospitalMap,
[strHospitalAddress stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]];
[[UIApplication sharedApplication] openURL:searchMap];
}
-(IBAction)openEmail {//打开mail
// Fire off an email to apple support
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto://devprograms@apple.com"]];
}
-(IBAction)openPhone {//拨打电话
// Call Google 411
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://8004664411"]];
}
-(IBAction)openSms {//打开短信
// Text to Google SMS
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"sms://466453"]];
}
-(IBAction)openBrowser {//打开浏览器
// Lanuch any iPhone developers fav site
[[UIApplication sharedApplication] openURL[NSURL :URLWithString:@"http://itunesconnect.apple.com"]];
}