小编mib*_*rop的帖子

我正在使用JSON框架编写iPhone本机应用程序.

我的应用程序正在使用JSON访问Web服务.我们发送的JSON数据有嵌套对象,下面是提供的数据示例:

{
    "model": {
        "JSONRESPONSE": {
            "authenticationFlag": true,
            "sessionId": "3C4AA754D77BFBE33E0D66EBE306B8CA",
            "statusMessage": "Successful Login.",
            "locId": 1,
            "userName": "Joe Schmoe"
        }
    }
}

我使用objectForKey和valueForKey NSDictionary方法解析时遇到问题.我不断收到invalidArgumentException运行时错误.

例如,我想查询"authenticationFlag"元素的响应数据.

谢谢,迈克西雅图

以下是Objective-C代码,我试图在两个NSString值之间进行比较,但是它会引发运行时错误.这是代码:

NSDictionary *innerContent=[JSONResponseDict valueForKey:@"JSONRESPONSE"];
NSString *authFlag = [innerContent valueForKey:@"authenticationFlag"];

NSLog(@"authFlag = %@",authFlag);

UIAlertView *alert = [[UIAlertView alloc]
                      initWithTitle:nil
                      message: [NSString stringWithFormat:@"authenticationFlag = %@",authFlag]
                      delegate:self
                      cancelButtonTitle:@"OK"
                      otherButtonTitles:nil];
[alert show];
[alert release];

// This block is problematic
if ( [authFlag isEqualToString:@"1"]){
    NSLog(@"Logged in");
    self.view = homeView;
} else {
    NSLog(@"Not logged in");
}

请注意,NSString authFlag已经过测试,确实具有有效的字符串值.authFlag的值为"1"或"0"(它来自使用json-framework对JSON调用的响应).

这是运行时错误:

[Session started at 2009-03-29 19:21:00 -0700.]
2009-03-29 19:21:11.186 taggle[4144:20b] userEmail=user@domain.com&password=opensesame
2009-03-29 19:21:11.653 taggle[4144:20b] authFlag = 1
2009-03-29 19:21:11.655 taggle[4144:20b] *** -[NSCFBoolean isEqualToString:]:       unrecognized selector sent to …