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主要解决父子控件之间的布局关系：
/*
Flexible 灵活的,自由的
typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) {
UIViewAutoresizingNone = 0,
UIViewAutoresizingFlexibleLeftMargin = 1 << 0,
// 左边是自由的,右边是固定的(与storyboard中相反)
UIViewAutoresizingFlexibleWidth = 1 << 1,
// 宽度是可拉伸的
UIViewAutoresizingFlexibleRightMargin = 1 << 2,
// 右边是自由的,左边是固定的(与storyboard中相反)
UIViewAutoresizingFlexibleTopMargin = 1 << 3,
// 顶部是自由的,底部是固定的(与storyboard中相反)
UIViewAutoresizingFlexibleHeight = 1 << 4,
// 高度是自由的(高度是可拉伸的)
UIViewAutoresizingFlexibleBottomMargin = 1 << 5
// 底部是自由的,顶部是固定的(与storyboard中相反)
};
*/
//四周固定，内部自由
redView.autoresizingMask =UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
//四周自由，内部固定 redView.autoresizingMask=UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleRightMargin|UIViewAutoresizingFlexibleBottomMargin;
//四周自由，内部也自由 redView.autoresizingMask=UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleRightMargin|UIViewAutoresizingFlexibleBottomMargin;
autoresizing代码实现
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原文地址：http://www.cnblogs.com/shuizhuqing/p/4532086.html
