使用sizeWithFont计算UITextView的文本的高度：constrainedToSize：lineBreakMode似乎不返回正确的结果 [英] Calculate the height of a UITextView's text with sizeWithFont:constrainedToSize:lineBreakMode doesn't seem to return correct results

问题描述

我试图计算由UITextView约束的文本的高度，但它似乎不返回正确的结果。

这是我的代码： / p>

   - （void）textViewDidChange：（UITextView *）aTextView {
 CGSize textSize = [aTextView.text sizeWithFont：aTextView。 font constrainedToSize：aTextView.frame.size lineBreakMode：UILineBreakModeWordWrap]; 
 counter.text = [NSString stringWithFormat：@％f，textSize.height]; 
} 
  

您可以下载示例项目和一个简短的屏幕录像，说明问题（418 KB）。

总而言之，问题是当我在一行的末尾键入一个长字时，该字被移动到下一行，但是当字符串的高度未被正确调整时

任何帮助感谢。

最好，

托马斯。 >

PS ：它发生在iPhone SDK 3.1.3

解决方案

问题是UITextField在它实际上绘制和包装文本。据我所知，没有程序化的方式来获得这个尺寸，但只是从尺寸减去6左右应该使它的行为适当。

I'm trying to calculate the height of the text constrained by a UITextView but it doesn't seem to return correct results.

Here is my code :

- (void)textViewDidChange:(UITextView *)aTextView {
    CGSize textSize = [aTextView.text sizeWithFont:aTextView.font constrainedToSize:aTextView.frame.size lineBreakMode:UILineBreakModeWordWrap];
    counter.text = [NSString stringWithFormat:@"%f", textSize.height];
}

You can download the sample project and a short screencast that illustrates the problem (418 KB).

In summary, the problem is that when I type a long word at the end of a line, the word is moved to the next line, but the height of the string isn't correctly adjusted when it happens.

Any help appreciated.

Best,
Thomas.

P.S. : It happens with the iPhone SDK 3.1.3

解决方案

The issue is that the UITextField has a slight margin around the area it actually draws and wraps the text. As far as I know there is no programatic way to get this size, but just subtracting 6 or so from the size should make it behave appropriately.

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