Question

我试图在一个segue之后更新一个UITextView的文本属性，这是在一个表视图被点击之后发生的。

这是我的代码

MasterViewController.m

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{

if ([[segue identifier] isEqualToString:@"4 Choices"]) {
    NSLog(@"prepareForSegue is called");
    NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
    NSManagedObject *selectedObject = [[self fetchedResultsController] objectAtIndexPath:indexPath];
    NSString *questionContent = [[selectedObject valueForKey:@"questionContent"]description];
    self.questionContent = questionContent;
    [segue.destinationViewController setTextViewWith:self.questionContent];
}
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"didSelectRowAtIndexPath is called");
NSManagedObject *selectedObject = [[self fetchedResultsController] objectAtIndexPath:indexPath];
NSNumber *questionID = [selectedObject valueForKey:@"qID"];
int i = [questionID intValue];
if (i == 1) {
    [self performSegueWithIdentifier:@"4 Choices" sender:self];
}
else
{
    [self performSegueWithIdentifier:@"5 Choices" sender:self];
}
}

DetailViewController.m

-(void)setTextViewWith:(NSString *)aText
{
self.questionText = aText;
NSLog(@"setTextViewWith is called");

}

- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.questionView setText:self.questionText];
NSLog(@"viewWillAppear is called");
}

编辑1：更改代码以在'viewWillAppear'处设置文本编辑2：添加'didSelectRowAtIndexPath'

注意：segue是从MasterViewController指向DetailViewController（而不是来自 tableViewCell）

感谢您的帮助：）

Answer 1

可能无法在prepareForSegue点加载文本视图。我刚刚开始使用故事板，并且发现我必须在目标视图控制器上设置字符串属性，然后在viewDidLoad或viewWillAppear中更新UI组件。

在segue之后，UITextView不会更新文本

1 个答案: