对iOS 9 新增的控件 UIStackView 官方文档的翻译 第四部分

维护其管理的视图与子视图之间的统一性Maintaining Consistency Between the Arranged Views and Subviews

The stack view ensures that its arrangedSubviews property is always a subset of its subviews property. Specifically, the stack view enforces the following rules:
Stack 视图确保它的 arrangedSubviews 属性将一直是其 subviews 属性的子集合。明确的说，stack 视图强制实施了以下规定：

When the stack view adds a view to its arrangedSubviews array, it also add that view as a subview, if it isn’t already.
无论何时 stack 视图增加了一个视图到它的 arrangedSubviews 数组，其也将把这个视图作为子视图增加，如果还未增加的话。

When a subview is removed from the stack view, the stack view also removes it from the arrangedSubviews array.
无论何时一个子视图从 stack 视图中被移除，那么 stack 视图也将将其从 arrangedSubviews 数组中移除。

Removing a view from the arrangedSubviews array does not remove it as a subview. The stack view no longer manages the view’s size and position, but the view is still part of the view hierarchy, and is rendered on screen if it is visible.
从 arrangedSubviews 移除一个视图并不会将其作为子视图移除。stack 视图将不再管理该视图的尺寸和位置，但是该视图仍将是视图结构的一部分，并且当其可见的情况下仍会被渲染到屏幕上。

Although the arrangedSubviews array always contains a subset of the subviews array, the order of these arrays remain independent.
当 arrangedSubviews 数组一直包含着 subviews 数组的子集合，这些数组间的顺序仍然是独立的。

The order of the arrangedSubviews array defines the order in which views appear in the stack. For horizontal stacks, the views are laid out in reading order, with the lower index views appearing before the higher index views. In English, for example, the views are laid out in order from left to right. For vertical stacks, the views are laid out from top to bottom, with the lower index views above the higher index views.
arrangedSubviews 数组的顺序定义了展现在 stack 中的视图的顺序。对于水平 stack 视图，这些视图将以阅读顺序平铺，即较小索引的视图在较大索引视图的左侧。对于垂直 stack 视图，这些视图是从上到下平铺的，及较小索引的视图在较大索引视图的上方。

The order of the subviews array defines the Z-order of the subviews. If the views overlap, subviews with a lower index appear behind subviews with a higher index.
subviews 数组中的顺序定义了子视图在Z轴上是顺序。如果视图重叠，有较小索引的子视图将出现在有较大索引的子视图后方。

动态改变 Stack 视图内容Dynamically Changing the Stack View’s Content

The stack view automatically updates its layout whenever views are added, removed or inserted into the arrangedSubviews array, or whenever one of the arranged subviews’s hidden property changes.
当视图被加入、移出或插入 arrangedSubviews 数组时，或当一个被管理的子视图的 hidden 属性改变时，stack 视图都会自动更新它的布局。

OC代码:

// Appears to remove the first arranged view from the stack.
// The view is still inside the stack, it's just no longer visible, and no longer contributes to the layout.
UIView * firstView = self.stackView.arrangedSubviews[0];
firstView.hidden = YES;

Swift代码:

// Appears to remove the first arranged view from the stack. // The view is still inside the stack, it's just no longer visible, and no longer contributes to the layout.
let firstView = stackView.arrangedSubviews[0]
firstView.hidden = true

The stack view also automatically responds to changes to any of its properties. For example, you can dynamically change the stack’s orientation, by updating the stack view’s axis property.
stack 视图也会自动响应其任何属性的改变。举例，你可以更新 stack 视图的 axis 属性来动态改变的朝向。

OC代码:

// Toggle between a vertical and horizontal stack
if (self.stackView.axis == UILayoutConstraintAxisHorizontal) {
    self.stackView.axis = UILayoutConstraintAxisVertical;
}
else {
    self.stackView.axis = UILayoutConstraintAxisHorizontal;
}

Swift

// Toggle between a vertical and horizontal stack
if stackView.axis == .Horizontal {
    stackView.axis = .Vertical
}
else {
    stackView.axis = .Horizontal
}

You can animate both changes to the arranged subview’s hidden property and changes to the stack view’s properties by placing these changes inside an animation block.
对于被管理的子视图的 hidden 属性的变化和 stack 视图属性的变化，你可以通过将这些改变内置到一个动画块代码的方式以动画方式展现。

OC代码:

// Animates removing the first item in the stack.
[UIView animateWithDuration:0.25 animations:^{
    UIView * firstView = self.stackView.arrangedSubviews[0];
    firstView.hidden = YES;
}];

Swift代码:

// Animates removing the first item in the stack.
UIView.animateWithDuration(0.25) { () -> Void in
    let firstView = stackView.arrangedSubviews[0]
    firstView.hidden = true
}

Finally, you can define size-class specific values for many of the stack view’s properties directly in Interface Builder. The system automatically animates these changes whenever the stack view’s size class changes.
最后，你可以直接在Interface Builder中给很多 stack 视图属性定义特定的 “尺寸类” 类型值。系统将在 stack 视图的尺寸类改变时动画展现这些改变。

常用的方法Creating Stack Views

创建 Stack 视图

- initWithArrangedSubviews: (New in iOS 9.0)

管理安排的子视图

- addArrangedSubview: (New in iOS 9.0)
  arrangedSubviews Property (New in iOS 9.0)
- insertArrangedSubview:atIndex: (New in iOS 9.0)
- removeArrangedSubview: (New in iOS 9.0)

设置布局

alignment Property  (New in iOS 9.0)
axis Property  (New in iOS 9.0)
baselineRelativeArrangement Property  (New in iOS 9.0)
distribution Property  (New in iOS 9.0)
layoutMarginsRelativeArrangement Property  (New in iOS 9.0)
spacing Property  (New in iOS 9.0)

用到的常量

UIStackViewDistribution
UIStackViewAlignment

原文地址:
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIStackView_Class_Reference/index.html#//apple_ref/doc/uid/TP40015256

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