switch语句中的固定数字（随机）

Question

我是Xcode的新手，我真的陷入了困境。

我有一个UIProgressView，它填满了UISwipeGestureRecognizer。我也有一个switch语句。现在我想只有7种方法（从242开始）而progressTrue是假的。如果progressTrue为true，那么UIProgressView在1.0上，它应该随机选择新的7个案例。有可能吗？

感谢您的帮助！

-(void)vorgangDev {

int number = arc4random() % 242;

switch (number)  {

    case 0:
        question.text = @"Anlieferung/anliefern";
        answer.text = @"delivery, supply/deliver, supply";
        answer.hidden = YES;
        break;
    case 1:
        question.text = @"Artikel";
        answer.text = @"article, item";
        answer.hidden = YES;
        break;
    case 2:
        question.text = @"Artikelanzahl";
        answer.text = @"number of articles/ ~items";
        answer.hidden = YES;
        break;

//And so on...

}

我在这里打电话给vorgangDev。

if (progressTrue.progress == 1.0) {
    // The UIProgressView is full
    // if this is true do the question. 

    CABasicAnimation* fade = [CABasicAnimation animationWithKeyPath:@"backgroundColor"];
    fade.fromValue = (id)[UIColor blackColor].CGColor;
    fade.toValue = (id)[UIColor colorWithRed:50/255.0f green:109/255.0f blue:43/255.0f     alpha:1.0f].CGColor;
    [fade setDuration:1];
    [self.view.layer addAnimation:fade forKey:@"fadeAnimation"];

    progressTrue.progress = 0.0;
    [self vorgangDev];