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可视化语法 Visual Format Syntax
The following are examples of constraints you can specify using the visual format. Note how the text visually matches the image.
- 标准宽度 Standard Space
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[button]-[textField]
 - 宽度约束 Width Constraint
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[button(>=50)]
 - 与父视图关联 Connection to Superview
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|-50-[purpleBox]-50-|
 - 垂直布局 Vertical Layout
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V:[topField]-10-[bottomField]
 - 直连视图 Flush Views
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[maroonView][blueView]
- 优先权限Priority
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[button(100@20)]
 - 视图宽度相等 Equal Widths
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[button1(==button2)]
 - 多条件 Multiple Predicates
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[flexibleButton(>=70,<=100)]
 - 一行完整的布局 A Complete Line of Layout
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|-[find]-[findNext]-[findField(>=20)]-|
 功能 表达式 水平方向 H: 垂直方向 V: Views [view] SuperView | 关系 >=,==,<= 空间,间隙 - 优先级 @value
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