IOS请求H5页面、要求自定义agent判断是电脑、安卓还是iPhone登录

//自定制的userAgent
- (void)createMyAgent{
    
    NSString *userAgent = [[[UIWebView alloc]init]stringByEvaluatingJavaScriptFromString:@"navigator.userAgent"];

    NSString *customUserAgent = [userAgent stringByAppendingFormat:@" wangqidai/phone"];
    
    [[NSUserDefaults standardUserDefaults] registerDefaults:@{@"UserAgent":customUserAgent}];

}