UILabel - 自动调整标签大小以适合文本?

问题描述

是否可以自动调整 UILabel 框/边界的大小以适合所包含的文本?(我不在乎它是否比显示器大)

Is it possible to auto-resize the UILabel box/bounds to fit the contained text?(I don't care if it ends up larger than the display)

所以如果用户输入你好"或我的名字真的很长，我希望它适合这个框"，它永远不会被截断，标签会相应地加宽"?

So if a user enters "hello" or "my name is really long i want it to fit in this box", it is never truncated and the label is 'widened' accordingly?

推荐答案

请查看我的要点，其中我为 UILabel 创建了一个类别以获取非常相似的内容，我的类别允许 UILabel 拉伸它的高度以显示所有内容:https://gist.github.com/1005520

Please check out my gist where I have made a category for UILabel for something very similar, my category lets a UILabel stretch it's height to show all the content: https://gist.github.com/1005520

或查看此帖子:https://stackoverflow.com/a/7242981/662605

这会拉伸高度，但你可以轻松地改变它以另一种方式工作并用这样的东西拉伸宽度，我相信这是你想要做的:

This would stretch the height, but you can change it around easily to work the other way and stretch the width with something like this, which is I believe what you want to do:

@implementation UILabel (dynamicSizeMeWidth)

- (void)resizeToStretch{
    float width = [self expectedWidth];
    CGRect newFrame = [self frame];
    newFrame.size.width = width;
    [self setFrame:newFrame];
}

- (float)expectedWidth{
    [self setNumberOfLines:1];

    CGSize maximumLabelSize = CGSizeMake(CGRectGetWidth(self.bounds), CGFLOAT_MAX);

    CGSize expectedLabelSize = [[self text] sizeWithFont:[self font]
                                            constrainedToSize:maximumLabelSize
                                            lineBreakMode:[self lineBreakMode]];
    return expectedLabelSize.width;
}

@end

您可以更简单地使用 UIView 类中提供的 sizeToFit 方法，但将行数设置为 1 以确保安全.

You could more simply use the sizeToFit method available from the UIView class, but set the number of lines to 1 to be safe.

如果您使用 AutoLayout，那么您就有了一个内置的解决方案.通过将行数设置为 0，框架将适当调整您的标签大小(增加更多高度)以适合您的文本.

If you are using AutoLayout, then you have a built in solution. By setting the number of lines to 0, the framework will resize your label appropriately (adding more height) to fit your text.

sizeWithFont: 已弃用，因此使用 sizeWithAttributes: 代替:

sizeWithFont: is deprecated so use sizeWithAttributes: instead:

- (float)expectedWidth{
    [self setNumberOfLines:1];

    CGSize expectedLabelSize = [[self text] sizeWithAttributes:@{NSFontAttributeName:self.font}];

    return expectedLabelSize.width;
}

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