使用UITextView光標/滾動移動的問題

Question

我已經使用UITextView進行聊天，如截圖所示。

但問題是，如果我按鍵盤上的返回鍵，光標不會粘在UITextView邊界的底部。我也使用以下代碼：

- (void)textViewDidChange:(UITextView *)textView 
{ 
    if([textView contentSize].height <80.0) 
    { 
     CGFloat textHeight   = [self textHeightForTextView:textView]; 

     CGFloat newViewHeight = MAX(MIN(textHeight, 80.0), 33.0); 

     chatTxtHeightConstraint.constant = newViewHeight; 

     [textView scrollRangeToVisible:textView.selectedRange]; 
    } 
} 

任何解決方案？

Answer 1

我已經寫的chatTxtHeightConstraint.constant = newViewHeight;

- (void)textViewDidChange:(UITextView *)textView 
{ 
    if([textView contentSize].height <80.0) 
    { 
     CGFloat textHeight   = [self textHeightForTextView:textView]; 

     CGFloat newViewHeight = MAX(MIN(textHeight, 80.0), 33.0); 

     chatTxtHeightConstraint.constant = newViewHeight; 

     [textView layoutIfNeeded]; 
     [textView updateConstraints]; 

     [textView scrollRangeToVisible:textView.selectedRange]; 
    } 
} 

[textView layoutIfNeeded];和 [textView updateConstraints];婁代碼行解決問題