iOS：UILabel动态高度使用sizeWithFont：constrainedToSize：lineBreakMode：不工作 [英] iOS: UILabel dynamic height using sizeWithFont:constrainedToSize:lineBreakMode: not working

问题描述

我试图给出我的 UILabel 动态高度，以便我的其他标签的布局在横向和纵向中看起来都是正确的。

I am trying to give my UILabel dynamic height so that my layout of other labels looks correct in both landscape and portrait.

在肖像画中，我的文字换行到第二行，而在横向画面中却没有。因此，当使用 sizeWithFont：constrainedToSize：lineBreakMode：我在双向旋转时获得相同的高度，当我假设当文本为2行时它将是一个更大的数字。

In portrait, my text wraps to the second line, in landscape it does not. So, when using sizeWithFont:constrainedToSize:lineBreakMode: I get the same height when rotating both ways, when I had assumed it would be a larger number when the text was 2 lines.

当它有两行文字或更多（肖像）时，如何获得 UILabel 的高度在景观中获得一行的新高度？

How can I get the height of my UILabel when it has two lines of text or more (portrait) and get the new height which is one line, when in landscape?

我想我不理解如何使动态高度工作...

I guess I am not understanding how to get dynamic height working...

UILabel *itemTitle = [[UILabel alloc] initWithFrame:CGRectMake(10.0f, top, screen.size.width - 20, 200.0f)];
itemTitle.text = self.newsAsset.title;
itemTitle.adjustsFontSizeToFitWidth = NO;
itemTitle.autoresizingMask = UIViewAutoresizingFlexibleWidth;
itemTitle.font = [UIFont boldSystemFontOfSize:18.0];
itemTitle.textColor = [UIColor blackColor];
itemTitle.shadowColor = [UIColor whiteColor];
itemTitle.shadowOffset = CGSizeMake(0, 1);
itemTitle.backgroundColor = [UIColor blueColor];
itemTitle.lineBreakMode = UILineBreakModeWordWrap;
itemTitle.numberOfLines = 0;
[itemTitle sizeToFit];

// Set the height
CGSize maximumLabelSize = CGSizeMake(300,9999);
CGSize titleSize = [itemTitle.text sizeWithFont:itemTitle.font constrainedToSize:maximumLabelSize lineBreakMode:itemTitle.lineBreakMode];

NSLog(@"Height: %.f  Width: %.f", titleSize.height, titleSize.width);

//Adjust the label the the new height
CGRect newFrame = itemTitle.frame;
newFrame.size.height = titleSize.height;
itemTitle.frame = newFrame;

// Add them!
[headerView addSubview:itemTitle];
[itemTitle release];

top += titleSize.height;

推荐答案

更改您设置的行 maximumLabelSize to

change the line where you set maximumLabelSize to

CGSize maximumLabelSize = CGSizeMake(headerView.bounds.size.width, CGFLOAT_MAX);

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