iphone调用系统电话、浏览器、地图、邮件等

转自:http://helloios.diandian.com/post/2011-10-31/6387190

openURL的使用方法：[[UIApplication sharedApplication] openURL:[NSURL URLWithString:appString]];

其中系统的appString有：
1.Map http://maps.google.com/maps?q=Shanghai 
2.Email mailto://myname@google.com 
3.Tel tel://10086 
4.Msg sms://10086 

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。

//打开地图

- (IBAction)openMaps {
NSString*addressText = @"beijing"; //@"1Infinite Loop, Cupertino, CA 95014"; 
addressText =[addressText stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]; 
NSString*urlText = [NSString stringWithFormat:@"http://maps.google.com/maps?q=%@",addressText]; 
NSLog(@"urlText=============== %@", urlText); 
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlText]];
}

//打开mail

- (IBAction)openEmail { 

[[UIApplication sharedApplication]openURL:[NSURL URLWithString:@"mailto://devprograms@apple.com"]];

 }

//拨打电话 

- (IBAction)openPhone {

 [[UIApplication sharedApplication] openURL:[NSURLURLWithString:@"tel://8004664411"]]; 

}

//打开短信

- (IBAction)openSms { 

[[UIApplication sharedApplication] openURL:[NSURLURLWithString:@"sms://466453"]];

}

//打开浏览器

-(IBAction)openBrowser { 

[[UIApplication sharedApplication] openURL:[NSURLURLWithString:@"http://itunesconnect.apple.com"]]; 

}