Objective c 在对象上比较索引

我是C目标的新手，我一直在努力。 我搜索了一些问题，但似乎没有一个能回答我的具体需求，希望你们能帮助我！：）

我正在制作一个包含2个组件的选择器视图；一个是全美国，一个是首都

现在，当按下一个按钮时，我需要一个“if-else语句”来检查两个数组的索引是否匹配，以及它是否创建了一个操作。 谁能帮我弄一下开张的条件吗？现在它给了我“预期表达式”错误

if (_stateList objectAtIndex:[]== _capitalList objectAtIndex[]) {

    // Defining State & capitalnames by row
    NSInteger stateRow = [self.picker selectedRowInComponent:StatesList];
    NSInteger capitalRow = [self.picker selectedRowInComponent:CapitalsList];

    // Defining the Selected states and selected capital in the row
    NSString *selectedState = self.stateList[stateRow];
    NSString *selectedCapital = self.capitalList[capitalRow];

    // Giving a title to the alert message
    NSString *title = [[NSString alloc] initWithFormat:@"You selected %@ and %@", selectedState, selectedCapital];

    // Alert Message
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:title message:@"Thats right, +1 for you!" preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction *action = [UIAlertAction actionWithTitle:@"Great!" style:UIAlertActionStyleDefault handler:nil];

    [alert addAction:action];
    [self presentViewController:alert animated:YES completion:nil];

    // Updating the scores
    _rightScore++;
    _rightAnswer.text = [NSString stringWithFormat:@"%i", _rightScore];
    _scoreTotal = _rightScore - _wrongScore;
    _scoreLabel.text = [NSString stringWithFormat:@"Score: %i", _scoreTotal];


} else {

    // Defining State & capitalnames by row
    NSInteger stateRow = [self.picker selectedRowInComponent:StatesList];
    NSInteger capitalRow = [self.picker selectedRowInComponent:CapitalsList];

    // Defining the Selected states and selected capital in the row
    NSString *selectedState = self.stateList[stateRow];
    NSString *selectedCapital = self.capitalList[capitalRow];

    // Giving a title to the alert message
    NSString *title = [[NSString alloc] initWithFormat:@"You have selected %@ and %@", selectedState, selectedCapital];

    // Alert Message
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:title message:@"Thats not correct, -1 for you." preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction *action = [UIAlertAction actionWithTitle:@"Let me try again!" style:UIAlertActionStyleDefault handler:nil];

    [alert addAction:action];
    [self presentViewController:alert animated:YES completion:nil];

    // Updating the scores
    _wrongScore++;
    _wrongAnswer.text = [NSString stringWithFormat:@"%i", _wrongScore];
    _scoreTotal = _rightScore - _wrongScore;
    _scoreLabel.text = [NSString stringWithFormat:@"Score: %i", _scoreTotal];


}

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您正在将所选行分配给两个变量

stateRow

和

capitalRow

。您似乎想做的是比较这两个变量，看看它们是否具有相同的值，例如，

if（stateRow==capitalRow）{…}else{…}

---

HTH

如果要比较索引

i

中的对象，应使用

[[[u stateList objectAtIndex:i]isEqual:[[u capitalList objectAtIndex:i]]

。如果要比较整个数组，可以执行

[\u stateList isEqualToArray:\u capitalList]

。这就成功了！非常感谢，现在我可以继续前进了！：）我使用了茨诺里的答案：[[u stateList objectAtIndex:I]isEqual:[[u capitalList objectAtIndex:I]]它工作得很好，谢谢你的输入！