我想随机化我的测验问题，但它似乎不适用于viewDidLoad
我在 id 处应用断点totalQuestions = nil;并运行它。调试器告诉我
[totalQuestions = (id) 0x00c82733] [0](id)
下面的代码中是否有任何错误？
QuizViewController.m
int totalQuestions = 0, qCount=1, myScore=0;
// Implement viewDidLoad to do additional setup after loading the view.
-(void)viewDidLoad {
qCount = 1; myScore = 0;
totalQuestions = [appDelegate.qns count];
quizLbl.text =quizLblV;
headerLbl.text =headerLblV;
[qBtn setTitle:qBtnV forState:UIControlStateNormal];
[qBtnB setTitle:qBtnBV forState:UIControlStateNormal];
[qBtnC setTitle:qBtnCV forState:UIControlStateNormal];
[qBtnD setTitle:qBtnDV forState:UIControlStateNormal];
appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
id totalQuestions = nil;
if ([appDelegate.qns count] > 0){
int randomIndex = arc4random()%[appDelegate.qns count];
totalQuestions = [appDelegate.qns objectAtIndex:randomIndex];
}
}
-(IBAction)buttonWasClicked:(id)sender{
UIButton *resultebutton= (UIButton*)sender;
if (qCount < totalQuestions) {
id prevQuestion = [appDelegate.qns objectAtIndex:qCount-1];
NSString * correctAns = [prevQuestion labelAns];
if ([correctAns isEqualToString:resultebutton.titleLabel.text])
myScore += 1;
// NSLog(@"The button title is %@ ", correctAns);
// NSLog(@"The button title is %@ ", resultebutton.titleLabel.text);
NSString *finishingStatement = [[NSString alloc] initWithFormat:@"%i out of %i correct!", myScore, totalQuestions];
theScore.text = finishingStatement;
id nextQuestion = [appDelegate.qns objectAtIndex:qCount];
quizLbl.text = [nextQuestion labelQn];
headerLbl.text = [nextQuestion labelHeader];
[qBtn setTitle:[nextQuestion labelBtn] forState:UIControlStateNormal];
[qBtnB setTitle:[nextQuestion labelBtnB] forState:UIControlStateNormal];
[qBtnC setTitle:[nextQuestion labelBtnC] forState:UIControlStateNormal];
[qBtnD setTitle:[nextQuestion labelBtnD] forState:UIControlStateNormal];
qCount++;
}
else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Results" message: [[NSString alloc] initWithFormat:@"You have answer %i questions correctly!", myScore]
delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
// alert.cancelButtonIndex = -1;
[alert show];
}
}
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0){
QuizTableViewController *quizTable = [self.storyboard instantiateViewControllerWithIdentifier:@"quizTable"];
UINavigationController *quizController = [[UINavigationController alloc] initWithRootViewController:quizTable];
[quizController setModalPresentationStyle:UIModalPresentationFormSheet];
[quizController setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
[self presentViewController:quizController animated:YES completion:nil];
}
}