转载自：http://www.jianshu.com/p/b637d3d21606
UIViewAutoresizingMaskNone
view的frame不会随superview的改变而改变，相当于frame（右图的xib中预览效果与实际效果有差，实际效果是view的上边距不变）
UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleBottomMargin
view和其superView左间距和上间距固定，宽高固定，右间距和底部间距随父控件的缩放而按比例缩放
UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleBottomMargin
view与其superView上间距固定，右间距固定，宽高固定，左间距、下间距锁父控件的缩放而缩放
UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin
view与其superView的右间距、底部间距固定，宽高固定，上间距、左间距随父控件的缩放而缩放
UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin
view与其superView的左间距、底部间距固定，宽高固定，右间距、上间距随父控件的缩放而缩放
UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleHeight
view与其superView的上间距、左间距、底部间距固定，宽度固定。高度、右边距随父控件缩放而缩放
UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleWidth
view与其superView的左间距、上间距、右间距固定，高度固定。宽度、底部间距随父控件的缩放而缩放
UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleHeight
view与其superView的上间距、右间距、底部间距固定，宽度固定。高度、左间距随父控件的缩放而缩放
UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth
view与其superView的左间距、右间距、底部间距固定，高度固定。宽度、上间距随父控件的缩放而缩放
UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight
view与其superView的左间距、上间距、底部间距固定。宽度、高度、右间距随父控件的缩放而缩放
UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight
view与其superView的左间距、上间距、右间距固定。宽度、高度、底部间距随父控件的缩放而缩放
UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight
view与其superView的上间距、右间距、左间距固定。宽度、高度、左间距随父控件的缩放而缩放
UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight
view与其superView的左间距、底部间距、右间距固定。宽度、高度、上间距随父控件的缩放而缩放
UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottom
view与其superView的宽高比例维持不变，上下左右间距也随其superView的缩放而缩放
UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleBottomMargin
view与其superView的左右间距固定，高度固定，宽度、上间距、底部间距随其父控件的缩放而缩放
UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin
view与其superView的上下左右边距的比例维持不变，宽高固定，反映在storyBoard中，就是什么都不设置
UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleRightMargin
左边距、右边距、宽按比例调整，上边距固定，下边距固定，高度固定（右图的xib中预览效果与实际效果有差，实际效果是view的上边距不变）垂直方向是同样效果，故不列举
UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight
自动调整view的宽和高，保证上下左右边距不变。如把tableView设置为此属性，那么无论viewController的view是多大，都能自动铺满
原文链接：http://www.jianshu.com/p/b637d3d21606
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