字典每次都得到分配

我有兩個意見。在第一課中，我有自定義單元格的表格，在那裏重複使用單元格三次。我想用另一個類的選定文本更新每行的表格單元格文本。我已經實現從另一個類獲取文本值並進行更新。用於存儲使用NSDictionary的每個行值。這樣我可以獲取字典值並在我的cellforrowatindexpath中更新以更新單元格文本值。我的代碼，字典每次都得到分配

A類 - 目標C：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 
    static NSString *cellIdentifier = @"challengeTableCell"; 
    cell = (EnrollmentChallengeTableViewCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier]; 
    if (cell == nil) { 
    cell = [[EnrollmentChallengeTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier]; 
} 

cell.answerTextfield.delegate = self; 

if (indexPath.row == 0) { 
    cell.questionTitleLabel.text = @"Challenge Question 1"; 
    cell.questionLabel.tag = 100; 
    cell.questionLabel.textColor = [UIColor blackColor]; 
    NSString *user1 = [myDict objectForKey:@"firstQuestion"]; 
    NSLog(@"firstquestion: %@",user1); 
} 
else if (indexPath.row == 1) { 
    cell.questionTitleLabel.text = @"Challenge Question 2"; 
    cell.questionLabel.tag = 101; 
    NSString *user2 = [myDict objectForKey:@"secondQuestion"]; 
    NSLog(@"secondQuestion: %@",user2); 

} 
else { 
    cell.questionTitleLabel.text = @"Challenge Question 3"; 
    cell.questionLabel.tag = 102; 
    NSString *user3 = [myDict objectForKey:@"thirdQuestion"]; 
    NSLog(@"thirdQuestion: %@",user3); 
} 

if (cell.questionLabel.tag == 100 || cell.questionLabel.tag == 101 || cell.questionLabel.tag == 102) { 
    UITapGestureRecognizer* gesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(selectQuestion:)]; 
    [cell.questionLabel setUserInteractionEnabled:YES]; 
    [cell.questionLabel addGestureRecognizer:gesture]; 
} 

    return cell; 
} 

-(void)selectQuestion:(UITapGestureRecognizer *) sender 
{ 
    CGPoint touchLocation = [sender locationOfTouch:0 inView:challengeQuestionsTable]; 
    newIndexPath = [challengeQuestionsTable indexPathForRowAtPoint:touchLocation]; 
    selectQuestionVC = [EnrollmentSelectQuestionViewController instantiate]; 
    selectQuestionVC.questionDelegate = self; 
    [self presentViewController:selectQuestionVC animated:YES completion:nil]; 
} 

#pragma mark - Table Selection Delegate 

-(void)valueChanged:(NSString *)questionString { 
    //[challengeQuestionsTable reloadRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationNone]; 
    passedValue = questionString; 
    NSLog(@"questionvalue: %@",passedValue); 
    NSLog(@"mydict: %lu",(unsigned long)[myDict count]); 
    cell = [challengeQuestionsTable cellForRowAtIndexPath:newIndexPath]; 
    NSLog(@"you have selected index: %ld", (long)newIndexPath.row); 
    [[NSUserDefaults standardUserDefaults] setInteger:newIndexPath.row forKey:@"SelectedIndex"]; 
    [[NSUserDefaults standardUserDefaults] synchronize]; 

    // NSInteger numberOfRows = [challengeQuestionsTable numberOfRowsInSection:[indexPath section]]; 
    NSLog(@"indexpath row: %ld",newIndexPath.row); 

    if (newIndexPath.row == 0) { 
     [myDict setValue:passedValue forKey:@"firstQuestion"]; 
    } else if (newIndexPath.row == 1) { 
     [myDict setValue:passedValue forKey:@"secondQuestion"]; 
    } else { 
     [myDict setValue:passedValue forKey:@"thirdQuestion"]; 
    } 

    NSLog(@"mydict: %@",myDict); 
    NSLog(@"1st: %@",[myDict objectForKey:@"firstQuestion"]); 
    NSLog(@"2nd: %@",[myDict objectForKey:@"secondQuestion"]); 
    NSLog(@"3rd: %@",[myDict objectForKey:@"thirdQuestion"]); 
}

B類 - SWIFT：

var questionDelegate: SelectedQuestionDelegate? 

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { 
    tableView.deselectRow(at: indexPath, animated: true) 
    print("selected index :",indexPath.row) 

    let selectedCell = tableView.cellForRow(at: indexPath) 
    print("did select and the text is \(selectedCell?.textLabel?.text)") 
    let storyboard = UIStoryboard(name: "EnrollmentChallengeQuestions", bundle: nil) 
    challengeVC = storyboard.instantiateViewController(withIdentifier: "ChallengeQuestions") as! EnrollmentChallengeQuestionsViewController 
    challengeVC.passedValue = selectedCell?.textLabel?.text 
    print("text label value: ", challengeVC.passedValue) 
    questionDelegate?.valueChanged(challengeVC.passedValue) 
    self.present(challengeVC, animated: true , completion: nil) 
}

在這裏，在ValueChanged功能，我的字典在時刻僅保持一個值。我想要把第一行的第一個問題，第二行的第二個問題和第三個問題同時進行。我的字典每次都會刷新。還試圖分配我的字典在viewdidload & viewwillappear。所有方法從另一個類來的時候再次被調用。如何解決這個問題？

來源

2017-10-17 user579911

什麼是你的兩個控制器之間的導航？你的兩個控制器中的哪一個持有答案，哪一個包含答案？爲什麼你將Swift和Objective C混合？ – Ocunidee

我認爲你需要使用dismiss(animated: true, completion: nil)而不是self.present(challengeVC, animated: true , completion: nil)。

目前，當你選擇一個問題，你目前的challengeVC，再這樣了viewDidLoad和viewWillAppear方法被再次調用，所以你的字典再次被分配

來源

2017-10-17 08:32:33 3stud1ant3

字典每次都得到分配

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