如果正在包装的文本中有一个长字符串，sizeWithFont不会为UITextView提供正确的高度 [英] sizeWithFont doesn't give correct height for UITextView if there is a long string in the text being wrapped

问题描述

有没有办法使用以下方法获得正确的NSString大小：

Is there a way to get the correct size of an NSString using:

- (CGSize)sizeWithFont:(UIFont *)font forWidth:(CGFloat)width lineBreakMode:(UILineBreakMode)lineBreakMode

不会被2抛出或300个字符串。目前，如果我尝试在这些长字符串上使用此方法，则会错误地计算它们，并且最终会在UITextView的底部显示大量空格。

that doesnt get thrown off by 2 or 3 hundred character strings. At the moment if I try to use this method on these long strings it incorrectly calculates them and I end up with lots of whitespace at the bottom of the UITextView.

我'尝试使用UILineBreakModeWordWrap和UILineBreakModeCharacterWrap。

I've tried using UILineBreakModeWordWrap and UILineBreakModeCharacterWrap.

调整大小正在进行中

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    CGFloat     result = 44.0f;
    NSString*   text = nil;
    CGFloat     width = 0;
    CGFloat     tableViewWidth;
    CGRect      bounds = [UIScreen mainScreen].bounds;

    tableViewWidth = bounds.size.width;


    width = tableViewWidth - 150;       

    text = stringWithLongWords;

    if (text) {
        CGSize      textSize = { width, 20000.0f };     
        CGSize      size = [text sizeWithFont:[UIFont systemFontOfSize:10.0f] constrainedToSize:textSize lineBreakMode:UILineBreakModeWordWrap];

        size.height += 50.0f;               
        result = MAX(size.height, 44.0f+30.0f); 
    }

    return result;
}

推荐答案

UITextView 与包含在 UIScrollView 中的 UILabel 完全不同。它的行间距不同于字体大小和边距 sizeWithFont：constrainedToSize：linkBreakMode：不占。

UITextView is not exactly like a UILabel wrapped in a UIScrollView. It has line spacing different from the font size and margins that sizeWithFont:constrainedToSize:linkBreakMode: doesn't account for.

了解字体大小，您可以计算行数并考虑行间距。您可以猜测边距并尝试欺骗 sizeWithFont：以提供更有用的答案。

Knowing your font size you might be able to calculate the # of lines and take line spacing into account. You can guess at the margins and try to trick sizeWithFont: to give a more useful answer.

流行的解决方案似乎是：

The popular solutions seem to be:

• 如果你不喜欢，只需使用 UILabel 如果您需要超链接 UITextView 功能

• just use a UILabel if you don't need any UITextView functionality

$ c>，覆盖 UIButtons 看起来像 UILabel上的超链接

if you need hyperlinks, overlay UIButtons that look like hyperlinks over a UILabel

使用屏幕外 UITextView 及其 sizeToFit 方法获得真实答案

use an off-screen UITextView and its sizeToFit method to get a real answer

我没有运气第三选项，但听起来应该有效，所以也许我做错了。

I had no luck w/ the 3rd option but it sounds like it should work, so perhaps I did something wrong.

我将尝试使用 UILabel 并覆盖超链接按钮。我们将看到结果如何。

I'm going to try using a UILabel and overlaying buttons for hyperlinks. We'll see how that turns out.

如果失败，Loren Brichter（Tweetie成名）总会选择：将所有内容都绘制成 UIView 你自己使用 CoreGraphics 。

If that fails, there is always the option taken by Loren Brichter (of Tweetie fame): draw everything into a UIView yourself using CoreGraphics.

祝你好运！

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