UILabel sizeThatFits 不起作用 [英] UILabel sizeThatFits not working

问题描述

我正在尝试计算 UITableViewCell 的高度，所以我定义了一个看起来像这样的类方法

I'm trying to calculate the height for a UITableViewCell so I've defined a class method that looks like this

+ (CGFloat)heightWithText:(NSString *)text
{
    SizingLabel.text = text;
    [SizingLabel sizeThatFits:CGSizeMake(LABEL_WIDTH, CGFLOAT_MAX)];

    return (TOP_MARGIN + SizingLabel.frame.size.height + BOTTOM_MARGIN);
}

我像这样定义了 SizingLabel:

I've defined SizingLabel like this:

+ (void)initialize
{
    SizingLabel = [[UILabel alloc] initWithFrame:CGRectZero];
    SizingLabel.numberOfLines = 0;
    SizingLabel.lineBreakMode = NSLineBreakByWordWrapping;
}

但是，如果我在 -heightWithText: 方法中设置断点，我会注意到 SizingLabel 的尺寸永远不会改变，因此我得到了不正确的值.这是为什么?

However, if i stick a breakpoint in the -heightWithText: method, i notice that the dimensions of SizingLabel never change and i thus get an incorrect value. Why is that?

推荐答案

+ (CGFloat)heightWithText:(NSString *)text
{
    SizingLabel.text = text;
    CGSize labelSize = [SizingLabel sizeThatFits:CGSizeMake(LABEL_WIDTH, CGFLOAT_MAX)];

    return (TOP_MARGIN + labelSize.height + BOTTOM_MARGIN);
}

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