ios - 此类与键的键值编码不兼容

我收到以下错误。 restaurantData.itemArray 包含 ProductData 对象的数组，我正在尝试使用 id 对其进行过滤，如下所示。我想知道我在实现中做错了什么。

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ valueForUndefinedKey:]: this class is not key value coding-compliant for the key id.'

+ (NSString *)menuItemForItemIdNSString *)itemId
{
    ProductData *restaurantData = [ProductData restaurantDataInstance];

    NSString *item = @"";

    NSPredicate *predicate = [NSPredicate predicateWithFormat"(%K == %@)", kItemId, itemId];
    // the error is thrown in the following line
    NSArray *filteredArray = [restaurantData.itemArray filteredArrayUsingPredicate:predicate];
    if ([filteredArray count] > 0)
        item = [(NSDictionary *)[filteredArray objectAtIndex:0] objectForKey:kItem];

    return item;
}

---

如果需要，这是我的 ProductData 类。

ProductData.m

#import "roductData.h"

#define kTitleKey        @"pName"
#define kPriceKey        @"price"
#define kIdKey           @"id"

@implementation ProductData
@synthesize pId, pImage, pPrice, pName, itemArray;

+(ProductData*) restaurantDataInstance {
    static ProductData *restaurantDataInstance;
    @synchronized(self) {
        if(!restaurantDataInstance){
            restaurantDataInstance = [[ProductData alloc] init];
        }
    }
    return restaurantDataInstance;
}

- (id)init
{
    if (self = [super init]) {
        if (!itemArray || !itemArray.count){
            itemArray = [NSMutableArray arrayWithCapacity:10];
        }
    }
    return self;
}

-(id)initWithDictionaryNSDictionary *)aDict{
    self = [self init];
    if (self){
        self.pId = [aDict objectForKey"id"];
        self.pPrice = [aDict objectForKey"price"];
        self.pName = [aDict objectForKey"name"];
    }
    return self;
}

---

Best Answer-推荐答案

您的 ProductData 没有名为 id 的属性，从您的示例代码中我可以看到它具有 pId

下面的行尝试访问名为 id 的属性，该属性不存在。

NSPredicate *predicate = [NSPredicate predicateWithFormat"(%K == %@)", kItemId, itemId];

关于ios - 此类与键的键值编码不兼容，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43688342/