键盘避免tableview与textviews

Question

我有一个表格视图在每个单元格中的文字视图。如何滚动tableview，以便输入到单元格textview中的文本始终可见？这与带有文本字段的tableview不同，因为如果输入新行，textfield不会更改其高度，而textview会更改它。

谢谢！

Answer 1

UITextView每次按下回车键都会改变其高度。按下返回时检测并略微向上滚动UITableView。

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text { 

    if([text isEqualToString:@"\n"]) { 

     CGPoint currentOffset=myTableView.contentOffset; 
     currentOffset.y-=10; 
     [myTableview setContentOffset:currentOffset]; 

    } 

    return YES; 
} 

Answer 2

1. 声明新的变量 的UITextView * activeTextView;

2. 在ViewDidLoad方法中，在显示/隐藏时注册键盘通知。

   [self keyboardNotifications]; 
   

3. 添加以下方法。 - （无效）keyboardNotifications { //注册通知时，键盘将显示 [[NSNotificationCenter defaultCenter]的addObserver：自 选择器：@selector（keyboardWillShow :) 名：UIKeyboardWillShowNotification 对象：无];

   // Register notification when the keyboard will be hide 
       [[NSNotificationCenter defaultCenter] addObserver:self 
                 selector:@selector(keyboardWillHide:) 
                  name:UIKeyboardWillHideNotification 
                  object:nil]; 
   } 
   

4. 在cellForRowAtIndexPath中使用indexpath设置UITextview标记。

   #pragma mark - Keyboard handling 
   -(void) keyboardWillShow:(NSNotification *)note { 
       if(activeTextView) 
        if ([TableCell count] < activeTextView.tag) { // It is validate table cell count and activeTextView.tag 
         NSDictionary* info = [note userInfo]; 
         CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size; 
   
         UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0); 
         tableV.contentInset = contentInsets; 
         tableV.scrollIndicatorInsets = contentInsets; 
         [tableV scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:activeTextView.tag inSection:0] atScrollPosition:UITableViewScrollPositionBottom animated:YES]; 
        } 
       } 
   
   } 
   
   -(void) keyboardWillHide:(NSNotification *)note { 
       [UIView animateWithDuration:.3 animations:^(void) { 
        tableV.contentInset = UIEdgeInsetsZero; 
        tableV.scrollIndicatorInsets = UIEdgeInsetsZero; 
       }]; 
   } 
   

5. UITextView的代表设定为activeTextView与当前的UITextView。

   #pragma mark - UITextViewDelegate :: 
   
   - (BOOL)textViewShouldBeginEditing:(UITextView *)textView 
   { 
       return YES; 
   } 
   
   - (BOOL)textViewShouldEndEditing:(UITextView *)textView 
   { 
       return YES; 
   } 
   
   // To be link with your TextView event "Editing Did Begin" 
   // memoryze the current TextView 
   - (void)textViewDidBeginEditing:(UITextView *)textView 
   { 
       activeTextView = textView; 
       [textView becomeFirstResponder]; 
   } 
   
   // To be link with your TextView event "Editing Did End" 
   // release current TextView 
   - (void)textViewDidEndEditing:(UITextView *)textView 
   { 
       activeTextView = nil; 
       [textView resignFirstResponder]; 
   }