iOS Xcode 6报错：setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key v

模型里永不了KVC

添加2个方法

//找未找到的Key
- (id) valueForUndefinedKey:(NSString *)key
{
    NSLog(@"Undefined Key: %@",key);
    return nil;
}
//设置未找到的Key
- (void)setValue:(id)value forUndefinedKey:(NSString *)key
{
    NSLog(@"Undefined Key: %@",key);
}//找未找到的Key
- (id) value