ios - 检查是数组中的字符串

Question

我有多个数组，我想检查从一个数组中随机选择的字符串是否在另一个数组中，如果是，则显示图像

我在 h 文件和 m 文件中全局设置了 plistarray1 和 plistarray2

最后一段代码是我无法根据从 plistarray 生成的随机字符串来显示图像的问题。

NSUserDefaults *defaults =[NSUserDefaults standardUserDefaults];






NSString *path = [[NSBundle mainBundle] pathForResource:
                  @"data" ofType:@"plist"];







if ([[defaults objectForKey:@"truthonoff"] isEqualToString:@"YES"] && [[defaults objectForKey:@"dareonoff"] isEqualToString:@"YES"]  ) {

        self.text.text =@"Are you ready for this?";
    [Animations fadeIn:self.text andAnimationDuration:1.0 andWait:YES];





        NSDictionary *plistDict1 = [[NSDictionary alloc] initWithContentsOfFile:path];
        NSArray * plistArray1 = plistDict1[@"truth"];



        NSDictionary *plistDict2 = [[NSDictionary alloc] initWithContentsOfFile:path];
        NSArray *plistArray2 = plistDict2[@"dare"];

        self.plistArray = [[plistArray1 arrayByAddingObjectsFromArray:plistArray2] mutableCopy];

    }

    else if ([[defaults objectForKey:@"truthonoff"] isEqualToString:@"YES"] ) {

        self.text.text =@"I hope you are feeling brave!";
        [Animations fadeIn:self.text andAnimationDuration:1.0 andWait:YES];




        NSDictionary *plistDict3 = [[NSDictionary alloc] initWithContentsOfFile:path];

        NSArray *plistArray3 = plistDict3[@"truth"] ;

        self.plistArray = [plistArray3 mutableCopy];


        NSLog(@"%@", plistArray);


    }

    else if ([[defaults objectForKey:@"dareonoff"] isEqualToString:@"YES"] ) {

        self.text.text =@"This could be interesting!";
        [Animations fadeIn:self.text andAnimationDuration:1.0 andWait:YES];



        NSDictionary *plistDict4 = [[NSDictionary alloc] initWithContentsOfFile:path];

        NSMutableArray *plistArray4 = plistDict4[@"dare"];

        self.plistArray = [plistArray4 mutableCopy];


        NSLog(@"%@", plistArray);


    }
    else {
        self.text.text =@"Please turn on Truth or Dare";
        [Animations fadeIn:self.text andAnimationDuration:1.0 andWait:YES];



    }



        ////display random quote from array

    int randV = arc4random() % self.plistArray.count;
        NSLog(@"%@", plistArray);


        self.text.text = self.plistArray[randV];
        [self.plistArray removeObjectAtIndex:randV];
        [Animations fadeIn:self.text andAnimationDuration:1.0 andWait:YES];

        //display truth or dare image
        if ([plistArray containsObject:plistArray1]) {
            // selectedString is from the truth array
            self.truthimage.hidden = NO;


        }

Answer 1

您的代码检查 plistArray 是否包含 plistArray1 对象，它不包含(最初，它包含 plistArray1 中的每个对象，但是而不是 plistArray1 对象本身)。

您的代码应该检查文本是否存在，如下所示:

// Obtain the random quote that you plan to display
NSString* toDisplay = self.plistArray[randV];
// Display the quote
self.text.text = toDisplay;
// Remove that quote from the plistArray
[self.plistArray removeObjectAtIndex:randV];
[Animations fadeIn:self.text andAnimationDuration:1.0 andWait:YES];
// Now's the fix: check plistArray1 for the toDisplay object
if ([plistArray1 containsObject:toDisplay]) {
    // selectedString is from the truth array
    self.truthimage.hidden = NO;
}

如果您将 plistArray1 替换为一个集合，则可以使此代码更高效，这将允许您检查摊销常数而不是线性时间的包含。

编辑:(作为对这条评论的回应:“plistArray1 被带回为 nil”)

这是因为除了具有同名的实例变量外，您还在方法中将 plistArray1 声明为局部变量。替换这一行

NSArray * plistArray1 = plistDict1[@"truth"];

有了这个

plistArray1 = plistDict1[@"truth"];

解决问题。