IOS在Storyboard中自动布局各个约束的理解

一、子视图与父视图位置

1、子视图于父视图的左、上、右、下的间距

1.1.leading Space to safe Area 

1.2.Top Space to safe Area

1.3.Trailing Space to safe Area1.4bottom Space to safe Area

 

2.1.Center Horizontally in Safe Area

2.2.Center Vertically in Safe Area

3.1.Equal Widths

3.2.Equal Heights

3.3.Aspect Ratio

二、子视图与子视图位置

1.1.Horizontal Spacing 子视图v1与子视图v2的水平间距 v1.leading = v2.leading

1.2.Vertical Spacing 子视图v1与子视图v2的垂直间距 v1.top = v2.top

1.3.Vertical Baseline Standard Spacing 子视图v1与子视图v2垂直基线标准间距  v1.top = v2.top

2、控制子视图v1的垂直位置

2.1.top

2.2.Center Vertically

2.3.first Baseline

2.4.bottom

3、控制子视图v1的水平位置

3.1.leading

3.2.Cneter CenterHorizontally

3.3.Trailing

4.1 Equal Widhts

4.2 Equal Heights

4.3 Aspect Ration

5.1 Hold Shift to select multiple

5.2 hold Option for alternates