自动调整高度的UIButton基于标题 - 自动版式ON

问题描述

基本上标题解释该问题。与X code工作，我有这样的按钮，我填充其具有不同的文本源（有些是长文本一些短）的标题。我只是想，按钮使用自动布局内容动态调整。

Basically the title explains the problem. Working with XCode, I have this button and I populate its title with different text sources (some are long texts some are short). I just want that the button resizes dynamically with the content using Autolayout.

东西不工作：

• sizeToFit ;


• 设置高度> = x的约束;


• 设置按钮的架高度= titleLabel高度。

似乎没有人知道在互联网上，我不知道它怎么可能呢？我认为这是一个按钮的最常用的功能之一。

Nobody seems to know over the internet and I wonder how could it be possible? I think is one of the MOST COMMON FEATURES for a button.

有人知道一种方法来帮助我吗？我做得不对的想法？有一些其他的方式来实现这一目标？

Someone knows a way to help me? Am I doing something wrong with this idea? Is there some other way to achieve this?

感谢您给任何人谁回答。真的。

Thank you to anyone who will answer. Really.

推荐答案

好吧，我发现这个解决方案：

Ok i found this solution:

NSAttributedString *text = [[NSAttributedString alloc] initWithString:[self titleForState:UIControlStateNormal] attributes:nil];

CGRect rect = [text boundingRectWithSize:(CGSize){287, CGFLOAT_MAX}
                                                 options:NSStringDrawingUsesLineFragmentOrigin
                                                 context:nil];


NSLayoutConstraint *buttonConstraint = [NSLayoutConstraint
                                    constraintWithItem:self
                                    attribute:NSLayoutAttributeHeight
                                    relatedBy:NSLayoutRelationEqual
                                    toItem: nil
                                    attribute:NSLayoutAttributeNotAnAttribute
                                    multiplier:1.0f
                                    constant:rect.size.height];

[self addConstraint:buttonConstraint];

这工作，但只有一次。我的意思是：只要新标题填充titleLabel它说，已经有一个约束，它不工作了...

Which works but ONLY ONE TIME. I mean: as soon as the new title populates the titleLabel it says that there is already a constraint and It doesn't work anymore...

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