Ios setTitle和setBackgroundImage不适用于UIView中嵌套的UIButton

我有一些这样的代码：

- (void)updateUI {
    for (UIButton *cardButton in self.oneDimensionalArrayContainingCardButtons) {
        int cardButtonIndex = [self.oneDimensionalArrayContainingCardButtons indexOfObject:cardButton];

        Card *card = [self.game cardAtIndex:cardButtonIndex];
        [cardButton setTitle:[self titleForCard:card] forState:UIControlStateNormal];
        [cardButton setBackgroundImage:[self backgroundImageForCard:card] forState:UIControlStateNormal];
        cardButton.enabled = !card.isMatched;
        self.scoreLabel.text = [NSString stringWithFormat:@"Score: %d", self.game.score];
    }
}


- (NSString *)titleForCard:(Card *)card
{
    NSString *ret =  card.isChosen ? card.contents : @"";
    NSLog(ret);
    return ret;
}

- (UIImage *)backgroundImageForCard:(Card *)card   {
    return [UIImage imageNamed:card.isChosen ? @"cardback" : @"cardfront"];
}

以及一个如下所示的UI：

- (void)updateUI {
    for (UIButton *cardButton in self.oneDimensionalArrayContainingCardButtons) {
        int cardButtonIndex = [self.oneDimensionalArrayContainingCardButtons indexOfObject:cardButton];

        Card *card = [self.game cardAtIndex:cardButtonIndex];
        [cardButton setTitle:[self titleForCard:card] forState:UIControlStateNormal];
        [cardButton setBackgroundImage:[self backgroundImageForCard:card] forState:UIControlStateNormal];
        cardButton.enabled = !card.isMatched;
        self.scoreLabel.text = [NSString stringWithFormat:@"Score: %d", self.game.score];
    }
}


- (NSString *)titleForCard:(Card *)card
{
    NSString *ret =  card.isChosen ? card.contents : @"";
    NSLog(ret);
    return ret;
}

- (UIImage *)backgroundImageForCard:(Card *)card   {
    return [UIImage imageNamed:card.isChosen ? @"cardback" : @"cardfront"];
}

当我点击下面的a卡时，我会将点击的卡设置为选中并更新UI。通过查看日志，我可以看到内容被设置为注销为

ret

，这意味着我正在将一个非空NSString传递到

cardButton setTitle

问题是，背景图像没有改变，标题似乎没有设置

cardButton.enabled

属性似乎已按预期设置

---

知道会发生什么吗？

什么是“卡”？它是从UIButton扩展而来的自定义按钮吗？在这种情况下，问题可能在于卡片，而不是传递给它的字符串。

设置标题颜色或将背景色红色/橙色添加到cardButton.titelLabel，以便您知道按钮的标题表是否隐藏在某处。如果它没有显示标题标签，那么您应该检查标题标签的框架。

卡是一个模型类，扩展了NSObject