[英]Scroll Group tableView when keyboard appears
我正在嘗試創建一個視圖,用戶可以在其中輸入他的信息(姓名,電子郵件,個人簡歷...)。
為此,我使用具有5個部分(0..4)的組表視圖,每個表都有一個內部具有UITextField
的單元格(第4部分中具有UITextView
的單元格除外)。
當用戶點擊其中一個textFields / textView時,將出現鍵盤,並且該單元格(具有選定的textField / textView)滾動到鍵盤上方的位置。
我的問題是在第4部分的textView中,當鍵盤出現時,它會以某種方式自動滾動顯示的單元格,但並不完全在正確的位置(文本視圖的一半隱藏在鍵盤后面)。
當我嘗試自己滾動時(在鍵盤完成動畫設置之后),我收到了textView的丑陋反彈。
它似乎是導致丑陋彈跳的原因,因為當鍵盤出現+我的滾動時,textView自動滾動。 此行為(自動滾動)僅針對textView發生,例如,如果我使用textField而不是第4節中的textView,它不會自動滾動。
所以問題是:如何將textView平滑滾動到正確的位置?
這是我的代碼:
#pragma mark - UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 5;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil];
switch (indexPath.section) {
case 0:
[cell.contentView addSubview:self.textField1];
break;
case 1:
[cell.contentView addSubview:self.textField2];
break;
case 2:
[cell.contentView addSubview:self.textField3];
break;
case 3:
[cell.contentView addSubview:self.textField4];
break;
case 4:
// this is the text view
[cell.contentView addSubview:self.textView];
break;
default:
break;
}
cell.selectionStyle = UITableViewCellSelectionStyleNone;
return cell;
}
#pragma mark - UITextFieldDelegate
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
self.activeResponder = textField;
return YES;
}
#pragma mark - UITextViewDelegate
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView {
self.activeResponder = textView;
return YES;
}
- (void)keyboardWillShow:(NSNotification*)notification {
NSLog(@"keyboard show");
CGFloat animationDuration = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
CGRect keyboardFrame = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGRect tableViewFrame = self.tableView.frame;
tableViewFrame.size.height -= keyboardFrame.size.height;
[UIView animateWithDuration:animationDuration delay:0.0 options:UIViewAnimationOptionBeginFromCurrentState animations:^{
self.tableView.frame = tableViewFrame;
} completion:^(BOOL finished) {
[self scrollToActiveResponder];
}];
}
- (void)keyboardWillHide:(NSNotification*)notification {
NSLog(@"keyboard hide");
CGFloat animationDuration = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
CGRect keyboardFrame = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGRect tableViewFrame = self.tableView.frame;
tableViewFrame.size.height += keyboardFrame.size.height;
[UIView animateWithDuration:animationDuration delay:0.0 options:UIViewAnimationOptionBeginFromCurrentState animations:^{
self.tableView.frame = tableViewFrame;
} completion:^(BOOL finished) {
}];
}
- (NSIndexPath *)indexPathForActiveResponder {
NSIndexPath *indexPath = nil;
if (self.activeResponder == self.textField1) {
indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
}
else if (self.activeResponder == self.textField2) {
indexPath = [NSIndexPath indexPathForRow:0 inSection:1];
}
else if (self.activeResponder == self.textField3) {
indexPath = [NSIndexPath indexPathForRow:0 inSection:2];
}
else if (self.activeResponder == self.textField4) {
indexPath = [NSIndexPath indexPathForRow:0 inSection:3];
}
else if (self.activeResponder == self.textView) {
indexPath = [NSIndexPath indexPathForRow:0 inSection:4];
}
return indexPath;
}
- (void)scrollToActiveResponder {
NSIndexPath *activeResponderIndexPath = [self indexPathForActiveResponder];
if (activeResponderIndexPath) {
[self.tableView scrollToRowAtIndexPath:activeResponderIndexPath atScrollPosition:UITableViewScrollPositionNone animated:YES];
}
}
我會嘗試這樣的事情:
。H
@interface YourViewController : UIViewController <UITextViewDelegate>
.m
//Set delegate to your textView
textView.delegate = self
#pragma mark - TextView Delegate
//TextView Became First Responder
- (void)textViewDidBeginEditing:(UITextView *)textView{
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:4];
// Other way to get the IndexPath
//NSIndexPath *indexPath = [self.tableView indexPathForCell:(UITableViewCell *)[[textView superview] superview]];
CGRect frame = [self.tableView rectForRowAtIndexPath:indexPath];
//It only works for Portrait iPhone
CGFloat keyboardHeight = 216.0f;
CGPoint offset = CGPointMake(0, self.view.frame.size.height - keyboardHeight - frame.size.height - frame.origin.y);
[self.tableView setContentOffset:offset animated:YES];
}
我沒有測試它,但是這就是我嘗試解決這個問題的方法。 您可以在此處找到有關如何計算鍵盤大小的更多信息:( http://www.idev101.com/code/User_Interface/keyboard.html )
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