本文内容来自: stackoverflow
hugging
hugging=>content dosen't want to grow(即抗拉)
compression resistance
compression resistance=>content doesn't want to shrink(即抗压)
例如:我们设置button 为 ** [ click me ]**.设置button 与superview 的pin优先级为500.
1.设置button的content hugging 优先级 >500,那么button将会显示为[click me],但是如果content hugging的优先级<500的话,则会正常显示。
2.设置button的content Compression resistance优先级>500,如果super view被压缩,则button将会显示为[click me],但是如果content compression resistance的优先级<500,则将会显示为[cli...]。
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