iPhone - 无法将 int 放入 UIButton

Posted 2023-03-21

【中文标题】iPhone - 无法将 int 放入 UIButton

【英文标题】：iPhone - cannot get int put into UIButton

【发布时间】：2011-05-14 10:18:26

【问题描述】：

我假设这只是因为我很累..但由于某种原因，我无法让我的 UIBUTTONS 填满生成的数字。除答案外，数字是随机生成的。我相信这很简单。谢谢！

- (void)determineQ 
    first = arc4random() % 1000;
    second = arc4random() % 1000;
    wrong1 = arc4random() % 1000;
    wrong2 = arc4random() % 1000;
    wrong3 = arc4random() % 1000;
    while (first < second) 
        first = arc4random() % 1000;
    
    [question setText:[NSString stringWithFormat:@"%d - %d = ?", first, second]];
    answer = first - second;
    NSLog(@"%d - %d = %d", first, second, answer);
    correctLetter = arc4random() % 100;
    if (correctLetter <= 25) 
        [ans2 setTitle:[NSString stringWithFormat:@"%d", answer] forState:UIControlEventAllEvents];
        [ans2 setTitle:[NSString stringWithFormat:@"%d", wrong1] forState:UIControlEventAllEvents];
        [ans3 setTitle:[NSString stringWithFormat:@"%d", wrong2] forState:UIControlEventAllEvents];
        [ans4 setTitle:[NSString stringWithFormat:@"%d", wrong3] forState:UIControlEventAllEvents];
        NSLog(@"The answer is A");
     else if (correctLetter <= 50) 
        [ans1 setTitle:[NSString stringWithFormat:@"%d", wrong1] forState:UIControlEventAllEvents];
        [ans2 setTitle:[NSString stringWithFormat:@"%d", answer] forState:UIControlEventAllEvents];
        [ans3 setTitle:[NSString stringWithFormat:@"%d", wrong2] forState:UIControlEventAllEvents];
        [ans4 setTitle:[NSString stringWithFormat:@"%d", wrong3] forState:UIControlEventAllEvents];
        NSLog(@"The answer is B");
     else if (correctLetter <= 75) 
        [ans1 setTitle:[NSString stringWithFormat:@"%d", wrong1] forState:UIControlEventAllEvents];
        [ans2 setTitle:[NSString stringWithFormat:@"%d", wrong2] forState:UIControlEventAllEvents];
        [ans3 setTitle:[NSString stringWithFormat:@"%d", answer] forState:UIControlEventAllEvents];
        [ans4 setTitle:[NSString stringWithFormat:@"%d", wrong3] forState:UIControlEventAllEvents];
        NSLog(@"The answer is C");
     else if (correctLetter <= 100) 
        [ans1 setTitle:[NSString stringWithFormat:@"%d", wrong1] forState:UIControlEventAllEvents];
        [ans2 setTitle:[NSString stringWithFormat:@"%d", wrong2] forState:UIControlEventAllEvents];
        [ans3 setTitle:[NSString stringWithFormat:@"%d", wrong3] forState:UIControlEventAllEvents];
        [ans4 setTitle:[NSString stringWithFormat:@"%d", answer] forState:UIControlEventAllEvents];
        NSLog(@"The answer is D");
    

编辑：对不起，我不小心放了 UILabel，我的意思是 UIButtons。

【问题讨论】：

你得到什么错误？ first 和 second 不是浮点数，因此应该是 [question setText:[NSString stringWithFormat:@"%.0f - %.0f = ?", first, second]];

first 和 second 实际上是整数。

【参考方案1】：

Arcrandom 生成 float 或 double，尝试将每个转换为 int，如下所示：

 [ans2 setTitle:[NSString stringWithFormat:@"%d", ((int)answer)] forState:UIControlEventAllEvents];

【参考方案2】：

如果您使用的是UILabel。使用setText 而不是setTitle，

    [ans2 settext:[NSString stringWithFormat:@"%d", answer]];

或

ans2.text = [NSString stringWithFormat:@"%d", answer];

【讨论】：

我的意思是 UIButtons，不小心放了 UILabels :/

@Muller ：好的，请在发布问题时小心。

【参考方案3】：

我想通了，我不应该一直在forState中等待一个Control Event，应该是这个

    [ans2 setTitle:[NSString stringWithFormat:@"%d", answer] forState:UIControlStateNormal];