UIButton不听内容模式设置？ [英] UIButton doesn't listen to content mode setting?

问题描述

firstButton是Custom类型的UIButton。我以编程方式将其中三个放在一个表的每个单元格中，因此：

firstButton is a UIButton of type Custom. I'm programmatically putting three of them across each cell of a table, thusly:

[firstButton setImage:markImage forState:UIControlStateNormal];
[firstButton setContentMode:UIViewContentModeScaleAspectFit];
[cell.contentView addSubview:firstButton];

在其他地方，我告诉它要clipToBounds。我得到的是图像中心方块的裁剪，而不是它的纵横比例渲染。我已经尝试了很多方法，包括在firstButton.imageView上设置mode属性，这似乎也不起作用。

Elsewhere, I'm telling it to clipToBounds. What I get is a crop of the center square of the image, rather than an aspect-scaled rendering of it. I've tried this lots of ways, including setting the mode property on firstButton.imageView, which also doesn't seem to work.

推荐答案

我遇到了同样的问题。我看到这个问题有点老了，但是我想提供一个清晰正确的答案来保存其他人（比如我）在搜索结果中弹出的时候。

I had the same problem. I see this question is a little old, but I want to provide a clear and correct answer to save other folks (like me) some time when it pops up in their search results.

它花了我一些搜索和实验，但我找到了解决方案。只需设置UIButton中隐藏ImageView的ContentMode。

It took me a bit of searching and experimenting, but I found the solution. Simply set the ContentMode of the "hidden" ImageView that is inside the UIButton.

[[firstButton imageView] setContentMode: UIViewContentModeScaleAspectFit];
[firstButton setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];

也许这就是Dan Ray在他接受的答案中提到的，但我怀疑不是。

Perhaps that's what Dan Ray was alluding to in his accepted answer, but I suspect not.

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