ios - 如何使用 UITextview 增加 View 大小？

Question

我做了一个示例演示，当我在 UITextview 上键入时，它会展开，但 View 不会展开，这是 UITextview 的 super View 。

代码

- (void)textViewDidChange:(UITextView *)textView
{
    CGFloat fixedWidth = textView.frame.size.width;
    CGSize newSize = [textView sizeThatFits:CGSizeMake(fixedWidth, MAXFLOAT)];
   CGRect newFrame = textView.frame;
    newFrame.size = CGSizeMake(fmaxf(newSize.width, fixedWidth), newSize.height);
    textView.frame = newFrame;
   self.myTextView.scrollEnabled = NO;

    CGRect viewFrame = self.myCommentView.frame;
    viewFrame.size.height =self.myCommentView.frame.size.height + 1;
    viewFrame.origin.y=self.myCommentView.frame.origin.y - 1;
    self.myCommentView.frame =viewFrame;
    [self.myTextView layoutIfNeeded];
    [self.myCommentView layoutIfNeeded];
}

问题是

View 未随 UITextview 展开。如果 View 展开，UITextview 也不会展开。

图片

UITextView 约束

Storyboard

我希望当 UITextview 展开时两者都应该展开。

谢谢你

Answer 1

声明 UITextViewDelegate 委托(delegate)方法。

@property (strong, nonatomic) IBOutlet UITextView *txtview;
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *backgroundviewhight; // myview hight constrain. 
@property (strong, nonatomic) IBOutlet UIView *myview; 

_txtview.delegate = self; 



 - (void)textViewDidChange:(UITextView *)textView
 {
        CGFloat fixedWidth = textView.frame.size.width;
        CGSize newSize = [textView sizeThatFits:CGSizeMake(fixedWidth, MAXFLOAT)];
        CGRect newFrame = textView.frame;
        newFrame.size = CGSizeMake(fmaxf(newSize.width, fixedWidth), newSize.height);
        textView.frame = newFrame;
        self.txtview.scrollEnabled = NO;
        _backgroundviewhight.constant = newFrame.size.height;
        [self.txtview layoutIfNeeded];
        [self.myview layoutIfNeeded];
  }

你的textview constrain like

为您的 myview 高度约束创建一个 NSLayoutConstraint 约束

输出:

Here