iphone调用系统电话、浏览器、地图、邮件等

from：http://blog.csdn.net/hufeng825/article/details/7217404

openURL的使用方法：
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       [[UIApplication sharedApplication] openURL:[NSURL URLWithString:appString]];  
其中系统的appString有：
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1.Map    http://maps.google.com/maps?q=Shanghai  
2.Email  mailto://[e-mail]  
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。
- (IBAction)openMaps {
    //打开地图 
   NSString*addressText = @"beijing";
    //@"1Infinite Loop, Cupertino, CA 95014"; 
   addressText =[addressTextstringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]; 
   NSString*urlText = [NSStringstringWithFormat:@"http://maps.google.com/maps?q=%@",addressText]; 
   NSLog(@"urlText=============== %@", urlText);
   [[UIApplicationsharedApplication] openURL:[NSURL URLWithString:urlText]];
}

- (IBAction)openEmail {
     //打开mail // Fire off an email to apple support
      [[UIApplication sharedApplication]openURL:[NSURL   URLWithString:@"mailto://[e-mail]"]];
 } 
 
- (IBAction)openPhone {
  
    //拨打电话
    // CallGoogle 411
    

    NSString *phone =@"4006509988";

   NSURL *url = [NSURLURLWithString:[NSStringstringWithFormat:@"tel:%@", phone]];

   //[[UIApplication sharedApplication] openURL:url];//普通方式

    //拨打前有提示，拨打完后自动回到应用中

    UIWebView *callPhoneWebVw = [[UIWebViewalloc] init];  

    NSURLRequest *request = [NSURLRequest requestWithURL:url];  

    [callPhoneWebVw loadRequest:request];

 } 
 
- (IBAction)openSms {
    //打开短信
     // Text toGoogle SMS
    [[UIApplication sharedApplication] openURL:[NSURLURLWithString:@"sms://466453"]];
}

-(IBAction)openBrowser {
    //打开浏览器
    // Lanuch any iPhone developers fav site
     [[UIApplication sharedApplication] openURL:[NSURLURLWithString:@"http://itunesconnect.apple.com"]];
 }