变量不是CFString

Question

我从JSON中得到了值，它给出了异常变量不是CFString。下面是我从中获取data http://www.krsconnect.no/community/api.html?method=categories&appid=620&mainonly=true的链接

NSString *test = aBook.catId；

Book类

@interface Book : NSObject {


NSString *catId;


NSString *name;

}

@property(nonatomic,retain)NSString*catId;

@property(nonatomic,retain) NSString *name;

 @end





    #import "Book.h"


    @implementation Book


    @synthesize catId,name;


  -(id)init{

  self=[super init];

    }

   - (id)initWithDictionary:(NSDictionary*) dict {


self.catId = [dict valueForKey:@"categoryId"];
self.name =  [dict valueForKey:@"name"];




      return self;



      }

   - (void)dealloc {
   [catId release];
   [name release];
   [super dealloc];
   }


   @end

Answer 1

它可能是一个整数。使用这个。

   NSString* test = [NSString stringWithFormat:@"%d",aBook.catId];

Answer 2

我想这个问题应该对你有帮助。

Replace multiple characters in a string in Objective-C?

CFStringRef aCFString = (CFStringRef)aNSString;

完美而透明地工作。同样：

NSString *aNSString = (NSString *)aCFString;