Question

I just wanted to ask how it is possible to use a variable as selector. My code looks like this:

NSString *stunde = [lesson objectForKey:@"stunde"]; // value is t1s1, then t1s2 then t1s3 etc.
t1s1.text=subject;

这毫无问题。但由于我必须循环浏览40个标签，这样做会很棒：

NSString *stunde = [lesson objectForKey:@"stunde"];
        **stunde**.text=subject;

如何使用从for循环中的json字符串中获得的值来动态地与标签对话。

结果应该如下所示：

NSString *stunde = [lesson objectForKey:@"stunde"];
        t1s1.text=@"English";

NSString *stunde = [lesson objectForKey:@"stunde"];
        t1s2.text=@"German"; 

NSString *stunde = [lesson objectForKey:@"stunde"];
        t1s3.text=@"Business Studies";

等

我希望你能帮助我，知道我的意思

提前感谢

更新：

我刚开始这样工作（硬编码）：

labels[0] = t1s1;
    labels[1] = t1s2;
    labels[2] = t1s3;
    for (NSDictionary *lessons in list)
    {
        int TotalLessons = [list count];

        NSString *fach = [lessons objectForKey:@"fach"];
        UILabel *stunde = [lessons objectForKey:@"stunde"];
        //labels[counter]=stunde;

        labels[counter].text=fach;


        counter=counter+1;
        if(counter>=TotalLessons){
            break;
        }



    }

but as there will be 40-50 labels I would like to add the label_names dynamically to the array: like this:

UILabel *stunde = [lessons objectForKey:@"stunde"];
labels[counter]=stunde;

值“stunde”将被定义为UILabel，然后添加到数组中。但为什么应用程序崩溃了？怎么了？：(

谢谢

Answer 1

您应该首先初始化一个字典，如下所示：

NSDictionary *Labels = [[NSDictionary alloc] initWithObjectsAndKeys:
    LabelObject1, @"LabelObjectName1",
    LabelObject2, @"LabelObjectName2",
    LabelObject3, @"LabelObjectName3",
    ...
    LabelObjectN, @"LabelObjectNameN",
    nil];

则可以通过以下方式访问每个标签：

NSString *stunde = [lesson objectForKey:@"stunde"];
((UILabel *)[Labels objectForKey:stunde]).text = @"Some text";

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