openURL方法

UIApplication *app = [UIApplication sharedApplication];

// 打电话
[app openURL:[NSURL URLWithString:@"tel://10086"]];

//发短信
[app openURL:[NSURL URLWithString:@"sms://10086"]];

//发邮件
[app openURL:[NSURL URLWithString:@"mailto://12345@qq.com"]];

//打开一个网页资源
[app openURL:[NSURL URLWithString:@"http://ios.itcast.cn"]];