ios - 区分两个 View Controller

Question

我有 3 个 VC。显示问题和答案的 A。当问题被错误选择时，会显示 B；一旦级别明确，就会显示 C。我遇到了从 A-B 和 A-C 的问题。这是我的代码

#import "AViewController.h"
#import "BViewController.h"
#import "CViewController.h"

@interface AViewController ()
@end

下面是实现代码

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
BViewController *incorrect = [segue destinationViewController];
incorrect.currentQuestion = self.currentQuestion;}

//这里 A 正在向 B 发送有关哪个问题回答错误的信息，即当前问题

- (void)viewDidLoad
{
[super viewDidLoad];
rootArray = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Addition1" ofType:@"plist"]];
currentQuestion = -1;
[self showNextQuestion];

}

 -(void) showNextQuestion{
currentQuestion++;
if (currentQuestion <= 3) {

    int numItems = [rootArray count];
    NSMutableArray *question = [NSMutableArray arrayWithCapacity:numItems];
    NSMutableArray *A = [NSMutableArray arrayWithCapacity:numItems];
    NSMutableArray *B = [NSMutableArray arrayWithCapacity:numItems];
    NSMutableArray *C = [NSMutableArray arrayWithCapacity:numItems];
    NSMutableArray *addimage = [NSMutableArray arrayWithCapacity:numItems];
    NSMutableArray *Answer = [NSMutableArray arrayWithCapacity:numItems];


    for (NSDictionary *itemData in rootArray) {
        [question addObject:[itemData objectForKey:@"question"]];
        [A addObject:[itemData objectForKey:@"A"]];
        [B addObject:[itemData objectForKey:@"B"]];
        [C addObject:[itemData objectForKey:@"C"]];
        [addimage addObject:[itemData objectForKey:@"ImageUse"]];
        [Answer addObject:[itemData objectForKey:@"ANS"]];

    }
    self.questionasked.text = question[currentQuestion];
    self.answer1.text = A[currentQuestion];
    self.answer2.text = B[currentQuestion];
    self.answer3.text = C[currentQuestion];
    additionImage.image = [UIImage imageNamed:addimage[currentQuestion]];
    self.correctAns = Answer[currentQuestion];}
else{
    NSLog(@"End of Array ");
    [self performSegueWithIdentifier:@"levelpassed" sender:nil];

}
}

上面的这个区域是我遇到问题的地方

当级别被清除时，C VC 会显示此错误

[CViewController setCurrentQuestion:]: unrecognized selector sent to instance 0x71cae70
2013-03-30 21:17:31.264 thefyp[14311:c07] *** Terminating app due to uncaught exception         'NSInvalidArgumentException', reason: '-[CViewController setCurrentQuestion:]: unrecognized selector sent to instance 0x71cae70'

我知道问题是 A 发现很难区分 segue，并尝试发送有关当前问题的 C 数据，而我想做的只是在 A 完成显示所有问题且没有数据时显示 C就像 A 继续转移到 B 时一样转移。B 和 C 也是 A 的子类。任何帮助将不胜感激

Answer 1

在prepareForSegue方法检查segue标识符UIStoryboardSegue.identifier它是否与您的 B 的过渡相匹配-VC。

因为调用performSegueWithIdentifier:@"levelPassed"也会遇到这个方法，并且你没有 B -VC，因此没有currentQuestion .