arc4random测验崩溃

Question

我对这一切都是新手。我已经浏览了论坛，但似乎找不到答案。我做了一个简单的测验，有20个问题(形成一个txt文件)

尝试让arc4random()代码随机选择问题。它可以工作，但在不同的时间崩溃的应用程序。有人能给我一些建议吗？谢谢。下面是我的一些代码：

代码：

// Go to the next question
int i;
int j;
NSInteger row = 0;

i = 20; i > 1;
{
j = arc4random()%i;

questionNumber = j + 1;

if(questionNumber == 1)
{
    row = questionNumber - 1;
}
else
{
    row = ((questionNumber - 1) * 6);
}}

// Set the question string, and set the buttons the the answers
NSString *selected = [theQuiz objectAtIndex:row];
NSString *activeQuestion = [[NSString alloc] initWithFormat:@"%@", selected];
[answer1 setTitle:[theQuiz objectAtIndex:row+1] forState:UIControlStateNormal];
[answer2 setTitle:[theQuiz objectAtIndex:row+2] forState:UIControlStateNormal];
[answer3 setTitle:[theQuiz objectAtIndex:row+3] forState:UIControlStateNormal];
[answer4 setTitle:[theQuiz objectAtIndex:row+4] forState:UIControlStateNormal];
rightAnswer = [[theQuiz objectAtIndex:row+5] intValue];


// Set theQuestion label to the active question
theQuestion.text = activeQuestion;

// Start the timer for the countdown
timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(countDown) userInfo:nil repeats:YES];

[selected release];
[activeQuestion release];

}

Answer 1

您可能不应该释放选定对象，因为objectAtIndex会返回自动释放的对象。