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ios字典裏面有字典,如何判斷是否有key

認為可以這麽判斷:-(id)handleNullObjectForKey:(NSString *)key {

id object = [self objectForKey:key];

if ([object isKindOfClass:[NSNull class]]) {

return nil;

}

return object;

}

或者是 if ([[dic allKeys] containsObject:key])