我有个问题。目前,我正在完善我的应用程序并对其进行调试等。发生了一些奇怪的事情。它是这样工作的:用户输入数据并进入TableView,并显示数据。简单。但是,一旦他切换到另一个视图然后又回到TableView,数据就消失了!奇怪的是它以前没有发生过。 (我重编了一些代码行,也许我在不知不觉中更改了某些内容)。我有点儿困惑,但这很奇怪,因为它以前有用。我认为问题出在buttonTag行:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// cell.image = selectedImage;
cell.textLabel.font = [UIFont fontWithName:@"Georgia" size:14.0];
if (buttonTag == 9001) {
cell.textLabel.text = [NSString stringWithFormat:@"%@ %@ %@, %@.", [self.userData objectAtIndex:0], [self.userData objectAtIndex:1], [self.userData objectAtIndex:2], [self.userData objectAtIndex:3]];
}
if (buttonTag == 9002) {
cell.textLabel.text = [NSString stringWithFormat:@"%@ %@ %@, %@.", [self.userData objectAtIndex:0], [self.userData objectAtIndex:1], [self.userData objectAtIndex:2], [self.userData objectAtIndex:3]];
}
if (buttonTag == 9003) {
cell.textLabel.text = [NSString stringWithFormat:@"%@ %@ %@,%@.", [self.userData objectAtIndex:0], [self.userData objectAtIndex:1], [self.userData objectAtIndex:2], [self.userData objectAtIndex:3]];
}
return cell;
}
因为他只是在按下特定按钮时才显示数据。如果您在不按其中一个按钮的情况下切换到TableView(例如从选项卡栏中),则不会显示任何内容。现在的问题是:如何告诉TableView从最后按下的按钮维护数据? (我在想NSUserDefaults?)
这是另一个ViewController,您可以从其中获取TableView:
- (IBAction)savePressed:(id)sender
{
if (buttonTag == 9001) {
button.tag = 9001;
NSUserDefaults *savetext = [NSUserDefaults standardUserDefaults];
[savetext setObject:Antwort.text forKey:@"hallo"];
[savetext setObject:Antwort2.text forKey:@"hallo2"];
[savetext setObject:Antwort3.text forKey:@"hallo3"];
UIButton *buttonPressed = (UIButton *)sender;
TV *second =[[TV alloc] initWithNibName:nil bundle:nil];
second.buttonTag = buttonPressed.tag;
[self.navigationController pushViewController:second animated:YES];
}
if (buttonTag == 9002) {
button.tag = 9002;
NSUserDefaults *savetext = [NSUserDefaults standardUserDefaults];
[savetext setObject:Antwort.text forKey:@"hallo"];
[savetext setObject:Antwort2.text forKey:@"hallo2"];
[savetext setObject:Antwort3.text forKey:@"hallo3"];
UIButton *buttonPressed = (UIButton *)sender;
TV *second =[[TV alloc] initWithNibName:nil bundle:nil];
second.buttonTag = buttonPressed.tag;
[self.navigationController pushViewController:second animated:YES];
}
if (buttonTag == 9003) {
button.tag = 9003;
NSUserDefaults *savetext = [NSUserDefaults standardUserDefaults];
[savetext setObject:Antwort.text forKey:@"hallo"];
[savetext setObject:Antwort2.text forKey:@"hallo2"];
[savetext setObject:Antwort3.text forKey:@"hallo3"];
UIButton *buttonPressed = (UIButton *)sender;
TV *second =[[TV alloc] initWithNibName:nil bundle:nil];
second.buttonTag = buttonPressed.tag;
[self.navigationController pushViewController:second animated:YES];
}
}
最佳答案
如果已读取数据并将其保存在NSUSerDefaults中,请尝试
[savetext synchronize]
然后再推向新的观点。
关于ios - 更改 View 后,TableView不显示数据,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/8837206/