我有一个UIViewController，其中包含一个带有自定义单元格的UITableView，该单元格内部是UILabels、几个不可编辑的UITextView 和一个可编辑的UITextView。现在，当我点击靠近桌子底部或底部的UITextView 之一时，UITextView 被键盘覆盖。我试过http://cocoawithlove.com/2008/10/sliding-uitextfields-around-to-avoid.html，它适用于文本字段/文本视图，但不适用于带有自定义单元格的表格。任何帮助或建议如何解决这个问题？
【问题讨论】：
标签： iphone objective-c ios uitableview uitextview
当您的表格视图包含像UITextField 或UITextView 这样的数据输入字段并且表格视图的长度足以覆盖屏幕时，您将无法访问被键盘隐藏的数据输入字段。
为了克服这个问题，有两种解决方案：
最简单且推荐的方法是使用UITableViewController 而不是UIViewController，这会自动确保键盘不会隐藏可编辑字段（如果可能，请使用此方法以避免 UI 调整不便)
如果您使用UIViewController 和UITableView 作为其子视图。你可以通过观察UIKeyboardWillShowNotification和UIKeyboardWillHideNotification来滚动你的UI框架
- (void)registerForKeyboardNotifications
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification object:nil]; //Posted immediately prior to the display of the keyboard
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification object:nil]; //Posted immediately prior to the dismissal of the keyboard.
}
- (void)keyboardWillShow:(NSNotification *)aNotification
{
CGRect keyboardBounds = [[[aNotification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationBeginsFromCurrentState:YES];
self.tableView.contentInset = UIEdgeInsetsMake(0, 0, keyboardBounds.size.height, 0); //when keyboard is up, that time just bring your text filed above the keyboard
self.tableView.scrollIndicatorInsets = UIEdgeInsetsMake(0, 0, keyboardBounds.size.height, 0);
[self.tableView scrollToRowAtIndexPath:[self findIndexPathToScroll]
atScrollPosition:UITableViewScrollPositionTop
animated:YES]; //findIndexPathToScroll implementation not shown
[UIView commitAnimations];
}
- (void)keyboardWillHide:(NSNotification *)aNotification
{
[UIView beginAnimations:nil context:nil];
[UIView setAnimationBeginsFromCurrentState:YES];
self.tableView.contentInset = UIEdgeInsetsZero; //Once keyboard is hidden then bring back your table into your original position.
self.tableView.scrollIndicatorInsets = UIEdgeInsetsZero;
[UIView commitAnimations];
}
registerForKeyboardNotifications - 在加载 UITableView 时调用此方法，即：viewDidLoad
findIndexPathToScroll - （未显示实现）它是您的业务逻辑来准备 IndexPath 应该滚动表视图的位置
removeObserver 'UIKeyboardWillShowNotification' 和 'UIKeyboardWillHideNotification' 都在 dealloc 和 viewDidUnload
【讨论】：
I fixed the issue. Please see my solution below:
1. First declare a global varibale called "activeFileld"
@property(nonatomic,strong)id activeFiled;
2. Create a method called "registerForKeyboardNotifications"
- (void)registerForKeyboardNotifications
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification object:nil]; //Posted immediately prior to the display of the keyboard
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification object:nil]; //Posted immediately prior to the dismissal of the keyboard.
}
3. Called the above method in viewWillAppear:
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
//Register kryboard Notification
[self registerForKeyboardNotifications];
}
4. Call the Delegate method for UitextFieldd Or UitextView
- (void)textFieldDidBeginEditing:(UITextField *)sender {
self.activeField = sender;
}
- (void)textFieldDidEndEditing:(UITextField *)sender{
self.activeField = nil;
}
- (void)textViewDidBeginEditing:(UITextView *)textView
{
// save the text view that is being edited
_notes = textView.text;
}
- (void)textViewDidEndEditing:(UITextView *)textView
{
// release the selected text view as we don't need it anymore
_activeField = nil;
}
5.
- (void)keyboardWillShow:(NSNotification *)notification
{
if([_activeField isKindOfClass:[UITextField class]]) {
NSDictionary* info = [notification userInfo];
NSLog(@"Dictionary %@",info);
CGRect kbRect = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
kbRect = [self.view convertRect:kbRect fromView:nil];
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbRect.size.height, 0.0);
self.tableView.contentInset = contentInsets;
self.tableView.scrollIndicatorInsets = contentInsets;
CGRect aRect = self.view.frame;
aRect.size.height -= kbRect.size.height;
UITextField *textField = (UITextField*)_activeField;
if (!CGRectContainsPoint(aRect, textField.frame.origin) ) {
[self.tableView scrollRectToVisible:textField.frame animated:YES];
}
}else if([_activeField isKindOfClass:[UITextView class]]) {
NSDictionary* info = [notification userInfo];
NSLog(@"Dictionary %@",info);
CGRect kbRect = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
kbRect = [self.view convertRect:kbRect fromView:nil];
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbRect.size.height, 0.0);
self.tableView.contentInset = contentInsets;
self.tableView.scrollIndicatorInsets = contentInsets;
CGRect aRect = self.view.frame;
aRect.size.height += kbRect.size.height;
UITextView *activeTextView = (UITextView*)_activeField;
if (!CGRectContainsPoint(aRect, textField.superview.superview.frame.origin) ) {
[self.tableView scrollRectToVisible:activeTextView.superview.superview.frame animated:YES];
}
}
}
// Called when the UIKeyboardWillHideNotification is received
- (void)keyboardWillHide:(NSNotification *)aNotification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
self.tableView.contentInset = contentInsets;
self.tableView.scrollIndicatorInsets = contentInsets;
}
【讨论】：
两种解决方案：
首选：使用 UITableViewController 而不是 UIViewController，因为它会自动确保您的键盘不会隐藏可编辑字段。
Hacky：How to make a UITextField move up when keyboard is present?
【讨论】：
一个简单的解决方案。实现heightForFooter 方法，让它返回一个值（比如说）100，当你选择UITableView 中的a 单元格时，它们会简单地向上滑动该高度，并且键盘不会覆盖视图。
【讨论】：
我一直为此使用双重解决方案。
为此，我注册了键盘显示/隐藏事件，并在它们被调用时采取相应的行动。
- (void)keyboardWillShow:(NSNotification *)note {
[self updateForKeyboardShowHide:note appearing:YES];
}
- (void)keyboardWillHide:(NSNotification *)note {
[self updateForKeyboardShowHide:note appearing:NO];
}
- (void)updateForKeyboardShowHide:(NSNotification *)note appearing:(BOOL)isAppearing {
// ignore notifications if our view isn't attached to the window
if (self.view.window == nil)
return;
CGFloat directionalModifier = isAppearing?-1:1;
CGRect keyboardBounds = [[note.userInfo valueForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
CGFloat animationDuration = [[note.userInfo valueForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
// figure out table re-size based on keyboard
CGFloat keyboardHeight;
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
if (UIInterfaceOrientationIsPortrait(orientation))
keyboardHeight = keyboardBounds.size.height;
else
keyboardHeight = keyboardBounds.size.width;
[UIView animateWithDuration:animationDuration animations:^{
// resize table
CGRect newFrame = table.frame;
newFrame.size.height += [self calculateKeyboardOffsetWithHeight:keyboardHeight] * directionalModifier;
table.frame = newFrame;
} completion:^(BOOL finished){
// scroll to selected cell
if (isAppearing) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:textFieldInEdit.tag inSection:0];
[table scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
}
}];
}
- (CGFloat)calulateKeyboardOffsetWithHeight:(CGFloat)keyboardHeight {
// This depends on the size and position of your table.
// If your table happen to go all the way to the bottom of
// the screen, you'll needs to adjust it's size by the whole keyboard height.
// You might as well ditch this method and inline the value.
return keyboardHeight;
// My table did not go to the bottom of the screen and the position was
// change dynamically so and there was long boring calculation I needed to
// do to figure out how much my table needed to shrink/grow.
}
【讨论】：