如何计算具有固定宽度的UILabel的行数？

问题描述：

如何计算具有固定宽度和给定文本的UILabel的行数？

How can I compute the number of lines of a UILabel with a fixed width and a given text ?

答

此代码假设标签具有所需的文本，并且其框架已设置为所需的宽度。

This code assumes label has the desired text and its frame is already set to the desired width.

- (int)lineCountForLabel:(UILabel *)label {
    CGSize constrain = CGSizeMake(label.bounds.size.width, FLT_MAX);
    CGSize size = [label.text sizeWithFont:label.font constrainedToSize:constrain lineBreakMode:UILineBreakModeWordWrap];

    return ceil(size.height / label.font.lineHeight);
}

更新：

如果您只想根据文本和当前宽度确定标签所需的高度，请将其更改为：

If all you want is to determine the required height for the label based on its text and current width, then change this to:

- (CGSize)sizeForLabel:(UILabel *)label {
    CGSize constrain = CGSizeMake(label.bounds.size.width, FLT_MAX);
    CGSize size = [label.text sizeWithFont:label.font constrainedToSize:constrain lineBreakMode:UILineBreakModeWordWrap];

    return size;
}

返回的尺寸是包含标签的正确宽度和高度。

The returned size is the proper width and height to contain the label.

如何计算具有固定宽度的UILabel的行数？

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