Question

我有一个按钮，其标题是我从服务器

获得的响应中选择的

获得的答复如下：

[  
 {"Id":"2","Name":"Alex"},  
 {"Id":"5","Name":"AMark"},  
 {"Id":"1","Name":"Karta"},  
 {"Id":"7","Name":"Juan"},  
 {"Id":"6","Name":"Honky"},  
 {"Id":"3","Name":"Nirauk"},  
 {"Id":"4","Name":"Chinua"}  
]

设置按钮标题的代码如下：

_ButtonArray =[[NSArray alloc]initWithObjects:self.b1,self.b2,self.b3,self.b4,self.b5,self.b6, nil];

-(void)getList:(NSData *)response
{
    NSArray* Array = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingAllowFragments error:nil];

    NSLog(@"%@", Array);
    for (UIButton *button  in _ButtonArray) {
        NSLog(@"the tag of button is %ld",(long)button.tag);
        for (NSDictionary* dict in Array)
        {
            if ([[dict objectForKey:@"Id"] intValue] == button.tag)
            {
                [button setTitle:[dict objectForKey:@"Name"] forState:UIControlStateNormal];
                NSLog(@"the Id is %@",[dict objectForKey:@"Id"]);
            }
        }
    }
}

但它崩溃并给出了这个例外：

“因未捕获的异常而终止应用程序'NSInvalidArgumentException'，原因：' - [__ NSCFString objectForKey：]：无法识别的选择器发送到实例0x7b24a7f0”

我无法理解我哪里出错了。请提出错误建议。

NSLog的结果：

(
        {
        Id = 2;
        Name = Alex;
    },
        {
        Id = 5;
        Name = AMark;
    },
        {
        Id = 1;
        Name = Karta;
    },
        {
        Id = 7;
        Name = Juan;
    },
        {
        Id = 6;
        Name = Honky;
    },
        {
        Id = 3;
        Name = "Nirauk";
    },
        {
        Id = 4;
        Name = "Chinua";
    }
)

Answer 1

您能否再次确认您的回复格式？是你有上面提到的dict数组，或者它可能有Dict =＆gt; Array =＆gt; Dict例如
{ [ {...} ] }

修改：

我执行了你的代码：
函数工作正常，我认为问题在于将响应字符串转换为NSData

NSString *responseString = @"[{"Id":"5","Name":"AMark"}, {"Id":"1","Name":"Karta"}]"; //您的回复字符串

NSData *data = [responseString dataUsingEncoding:NSUTF8StringEncoding];

[self getList:data]; //你的函数调用

这段代码没有崩溃。

因未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：' - [__ NSCFString objectForKey：]：

1 个答案: