我有一个故事板,里面插入了一个滚动条,因为要显示的内容太多而无法一次性显示。 滚动条包含:
表视图的行有两种。第一种(由控制器regularRegistrationCellVC定义)包含文本字段和标签。 当我在任何生成的单元格中单击任何文本字段时,会出现键盘并隐藏文本字段。此外,无法向上滚动视图内容以查看键盘下方的内容。 因此,按照apple的指令,我将此代码添加到包含滚动条的控制器:
注册键盘通知
- (void)registerForKeyboardNotifications
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWasShown:)
name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillBeHidden:)
name:UIKeyboardWillHideNotification object:nil];
}
发送UIKeyboardDidShowNotification时调用
- (void)keyboardWasShown:(NSNotification*)aNotification
{
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
scrollPanel.contentInset = contentInsets;
scrollPanel.scrollIndicatorInsets = contentInsets;
// If active text field is hidden by keyboard, scroll it so it's visible
// Your application might not need or want this behavior.
CGRect aRect = self.view.frame;
aRect.size.height -= kbSize.height;
if (!CGRectContainsPoint(aRect, activeField.frame.origin) ) {
CGPoint scrollPoint = CGPointMake(0.0, activeField.frame.origin.y-kbSize.height);
[scrollPanel setContentOffset:scrollPoint animated:YES];
}
}
键盘消失时调用
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
scrollPanel.contentInset = contentInsets;
scrollPanel.scrollIndicatorInsets = contentInsets;
}
管理开始编辑的事件
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
activeField = textField;
NSLog(@"inizio digitazione\n");
}
管理结束编辑事件
- (void)textFieldDidEndEditing:(UITextField *)textField
{
activeField = nil;
}
其中 activeField 是我的控制器的全局变量。
然后,我修改了创建第一种单元格的代码部分,这样每个第一类新单元都将我的视图控制器作为委托:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
if (indexPath.section == 0) {
static NSString *CellIdentifier = @"regularRegistrationCell";
regularRegistrationCellVC *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[regularRegistrationCellVC alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.regularFieldName.text = [self.orientationItems objectAtIndex:indexPath.row];
cell.regularTextField.delegate = self;
return cell;
}
else{
static NSString *CellIdentifier = @"orientationRegistrationCell";
orientationRegistrationCellVC *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[orientationRegistrationCellVC alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.fieldLabel.text = [self.orientationItems objectAtIndex:[orientationItems count]-1];
NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults];
NSString *val = nil;
if (standardUserDefaults)
val = [standardUserDefaults objectForKey:@"orientation"];
if (val == nil)
cell.orientationLabel.text = @"Eterosessuale";
else
cell.orientationLabel.text = val;
return cell;
}
}
最后,我宣布我的视图控制器(包括滚动条及其内容)实现 的 UITextFieldDelegate 即可。 使用NSLog打印,我发现每次点击文本字段时,管理事件的功能肯定会被执行。
你能说出我在哪里错了吗?
感谢您的帮助