Question

我有3个VC。一个显示问题和答案的A.一旦水平清除，当错误地选择问题C时显示B. 我有一个问题从A-B＆amp; A-C。这是我的代码

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

@interface AViewController ()
@end

现在这里是实现代码

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

//这里A发送有关哪个问题被错误回答的B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];

}
}

上面这个区域是我遇到问题的地方

当电平被清除时，C VC显示

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发现难以区分segue并且正在尝试发送关于当前问题的C数据，当我想要做的就是当A完成显示所有问题并且没有数据正在显示时像A一样转向B. B＆amp; C也是A的子类。任何帮助都将受到赞赏

Answer 1

在prepareForSegue方法中，检查segue标识符UIStoryboardSegue.identifier是否与转换到B - VC相匹配。

因为调用performSegueWithIdentifier:@"levelPassed"也会遇到此方法，并且您没有B - VC，因此没有currentQuestion。

区分两个视图控制器

1 个答案: