StackView对齐问题

Question

我想用不同的排列方式对齐3个堆栈。

1-图像0-0的两边都是下面的图像。

2-用户信息+文本10-10形成两边

当我将它们叠加在一起时，我只能将它们全部设置为0到所有边距，而不是每个堆栈。

在我的项目中，所有的内容都停留在左边的图像中，我希望在用户+文本堆栈中的空间从两个边距！如何修复这个看起来像下面的图像？

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Answer 1

因为我非常喜欢UIStackView，所以我用您的问题作为实验的理由。您可以将以下内容粘贴到Xcode 7操场：

import UIKit
import XCPlayground

let hostView = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 480))
hostView.backgroundColor = .whiteColor()
XCPlaygroundPage.currentPage.liveView = hostView

let headerLabel = UILabel()
headerLabel.translatesAutoresizingMaskIntoConstraints = false
headerLabel.numberOfLines = 0
headerLabel.text = "This is an info text shown on top of the image. The info text should inform the reader about the topic."

let topStackView = UIStackView(arrangedSubviews: [headerLabel])

let image = UIImage(named: "header.jpg")
let imageView = UIImageView(image: image)
imageView.backgroundColor = .yellowColor()
imageView.contentMode = .ScaleAspectFit

let bottomLabel = UILabel()
bottomLabel.translatesAutoresizingMaskIntoConstraints = false
bottomLabel.numberOfLines = 0
bottomLabel.text = "This is the story text. It is interessting and shows a lot insight to the topic. The reader should be eager to read it and at the end he/she would be able to share with friends and family."

let bottomStackView = UIStackView(arrangedSubviews: [bottomLabel])

let stackView = UIStackView(arrangedSubviews: [topStackView, imageView, bottomStackView])
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.axis = .Vertical
stackView.spacing = 10

hostView.addSubview(stackView)

let views = ["stackView": stackView]
var layoutConstraints: [NSLayoutConstraint] = []
layoutConstraints += NSLayoutConstraint.constraintsWithVisualFormat("|[stackView]|", options: [], metrics: nil, views: views)
layoutConstraints += NSLayoutConstraint.constraintsWithVisualFormat("V:|[stackView]", options: [], metrics: nil, views: views)
layoutConstraints.append(headerLabel.leadingAnchor.constraintEqualToAnchor(topStackView.leadingAnchor, constant: 10))
layoutConstraints.append(headerLabel.trailingAnchor.constraintEqualToAnchor(topStackView.trailingAnchor, constant: 10))

let imageSize = image!.size
let imageHeight = hostView.frame.size.width * imageSize.height / imageSize.width
layoutConstraints.append(imageView.heightAnchor.constraintEqualToConstant(imageHeight))

layoutConstraints.append(bottomLabel.leadingAnchor.constraintEqualToAnchor(bottomStackView.leadingAnchor, constant: 10))
layoutConstraints.append(bottomLabel.trailingAnchor.constraintEqualToAnchor(bottomStackView.trailingAnchor, constant: 10))

NSLayoutConstraint.activateConstraints(layoutConstraints)

或者，您可以查看我的UIStackViewPlayground的“故事视图”页面。