拨打电话

NSString *callPhone = [NSString stringWithFormat:@"telprompt://%@", @"110"];    

CGFloat version = [[[UIDevice currentDevice]systemVersion]floatValue];    

if (version >= 10.0) {         /// 大于等于10.0系统使用此openURL方法        

        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:callPhone] options:@{} completionHandler:nil];    

} else {

        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:callPhone]];    

}