Question

我有一个包含每个单元格中文本视图的表格视图。如何滚动tableview以便输入到单元格的textview中的文本始终可见？这与带有文本字段的tableview不同，因为文本字段不会改变它的高度，而textview则会改变它的高度。

谢谢！

Answer 1

每次按下返回时，UITextView都会更改其高度。按下返回时检测并稍微向上滚动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

声明新变量 UITextView * activeTextView;
在ViewDidLoad方法中，在显示/隐藏时注册键盘通知。
```
[self keyboardNotifications];
```
添加以下方法。 - （void）keyboardNotifications { //键盘显示时注册通知 [[NSNotificationCenter defaultCenter] addObserver：self 选择：@选择（keyboardWillShow :) 名称：UIKeyboardWillShowNotification 对象：无];
```
    // Register notification when the keyboard will be hide
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
}
```

使用cellForRowAtIndexPath中的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;
     }];
}

UITextView委托设置为当前UITextView的activeTextView。

#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];
}

键盘避免tableview与textviews

2 个答案: