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command+option+↑ (⌘⌥↑) 上对齐
command+option+↓ (⌘⌥↓)下对齐
command+option+↑ (⌘⌥←) 左对齐
command+option+↓ (⌘⌥→) 右对齐
command+option+= (⌘⌥=) 更新约束
Command-Control-H (⌘⌃H) 水平居中,竖向约束
Command-Control-V (⌘⌃V) 竖直居中,横向约束
Command-Control-X (⌘⌃X) 清空约束
