Masonry

是一个轻量级的布局框架， 拥有自己的描述语法， 采用更优雅的链式语法封装自动布局 简洁明了 并具有高可读性。

下面总结了平时不常见的使用方法来深入认识一下Masonry

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什么时候用Mas_

//以下两者完全一样

By default, macros which support autoboxing are prefixed with mas_.

Unprefixed versions are available by defining MAS_SHORTHAND_GLOBALS before importing Masonry.

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Learn to prioritize

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//2. mas_updateConstraints

Alternatively if you are only updating the constant value of the constraint you can use the convience method mas_updateConstraints instead of mas_makeConstraints

// this is Apple's recommended place for adding/updating constraints

// this method can get called multiple times in response to setNeedsUpdateConstraints

// which can be called by UIKit internally or in your code if you need to trigger an update to your constraints

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如何使用