Предикат NSPredicateWithFormat вызывает исключение

Question

Может кто-нибудь помочь мне с моим кодом ниже. Это выглядит правильно для меня, но последнее утверждение вызывает исключение. Все, что я пытаюсь сделать, это создать NSPredicate для использования с NSFetchRequest.
Переменная «Массив» ниже имеет следующие четыре объекта в соответствии с отладчиком:

Array   =   (__NSArrayI *)  0x6b930e0   4 objects
0   =   (__NSCFConstantString *)    0x4067c String1
1   =   (__NSCFConstantString *)    0x408ac String2
2   =   (__NSCFConstantString *)    0x408bc String3
3   =   (__NSCFConstantString *)    0x408cc String4


// Defines from header file  
#define ATT_NODE_LEVEL      @"nodeLevel"
#define NODE_LVL2           4

-(BOOL)initLVL2{  
    NSString *cond = [[NSString alloc] initWithFormat:@"parent.fullName"];

    /*   CAUSES AN EXCEPTION    */  
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"(%K == &@) && (%K == %@)", ATT_NODE_LEVEL, [NSNumber numberWithInt:NODE_LVL2], cond, [Array objectAtIndex:0]]; 
...
}

Выход отладчика:

objc[6076]: EXCEPTIONS: throwing 0x6e3ddf0 (object 0x6e3fb30, a NSException)
objc[6076]: EXCEPTIONS: searching through frame [ip=0xee0dc0 sp=0xbfffcfc0] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: unwinding through frame [ip=0xee0dc0 sp=0xbfffcfc0] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: handling exception 0x6e3ddd0 at 0xee0dc9
objc[6076]: EXCEPTIONS: rethrowing current exception
objc[6076]: EXCEPTIONS: searching through frame [ip=0xee0ddf sp=0xbfffcfc0] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: searching through frame [ip=0xee0bde sp=0xbfffd000] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: unwinding through frame [ip=0xee0ddf sp=0xbfffcfc0] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: finishing handler
objc[6076]: EXCEPTIONS: unwinding through frame [ip=0xee0df3 sp=0xbfffcfc0] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: unwinding through frame [ip=0xee0bde sp=0xbfffd000] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: handling exception 0x6e3ddd0 at 0xee0c29
objc[6076]: EXCEPTIONS: rethrowing current exception
objc[6076]: EXCEPTIONS: searching through frame [ip=0xee0c16 sp=0xbfffd000] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: searching through frame [ip=0x1496db3 sp=0xbfffea00] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: unwinding through frame [ip=0xee0c16 sp=0xbfffd000] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: finishing handler
objc[6076]: EXCEPTIONS: unwinding through frame [ip=0xee0c40 sp=0xbfffd000] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: unwinding through frame [ip=0x1496db3 sp=0xbfffea00] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: handling exception 0x6e3ddd0 at 0x1496e46
objc[6076]: EXCEPTIONS: rethrowing current exception
objc[6076]: EXCEPTIONS: searching through frame [ip=0x1496e0f sp=0xbfffea00] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: unwinding through frame [ip=0x1496e0f sp=0xbfffea00] for exception 0x6e3ddd0
objc[6076]: EXCEPTIONS: finishing handler
objc[6076]: EXCEPTIONS: unwinding through frame [ip=0x1496e38 sp=0xbfffea00] for exception 0x6e3ddd0

Answer 1

Ваша строка формата предиката имеет токен & @ для номера NSNumber.Измените его на% @.