如何将 UIImageViews 添加到受限于视图的 centerXAnchor 的 UIStackView?
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【中文标题】如何将 UIImageViews 添加到受限于视图的 centerXAnchor 的 UIStackView?【英文标题】:How to add UIImageViews to a UIStackView that is constrained to the centerXAnchor of a view? 【发布时间】:2018-07-20 21:25:55 【问题描述】:我正在尝试通过 UIImageViews 将配置文件图标添加到 UIStackView 以保持图标在视图中居中。我将如何根据 UIStackView 中不同数量的 UIImageViews 将固定框架的 UIImageViews 添加到 UIStackView 并保持 UIStackView 在主视图中居中?
let memberIcons: UIStackView =
let iconView = UIStackView()
iconView.translatesAutoresizingMaskIntoConstraints = false
iconView.axis = .horizontal
iconView.spacing = 5
iconView.distribution = .equalSpacing
iconView.alignment = .center
return iconView
()
for member in story!.members
let circle = UIImageView()
circle.frame = CGRect(x: 0, y: 0, width: 36, height: 36)
circle.translatesAutoresizingMaskIntoConstraints = false
circle.layer.cornerRadius = CGFloat(circle.frame.width / 2)
circle.image = member.profilePicture
circle.contentMode = .scaleAspectFill
circle.clipsToBounds = true
memberIcons.addArrangedSubview(circle)
【问题讨论】:
【参考方案1】:因为您设置了memberIcons.distribution = .equalSpace
,所以堆栈视图将询问其子视图的固有大小。当被问到时,UIImage
(即circle
)会将其固有大小计算为“图像像素大小/比例”,这不是您想要的——您希望图像具有固定大小(36 x 36)。
在circle
上使用自动布局:
override func viewDidLoad()
super.viewDidLoad()
view.addSubview(memberIcons)
memberIcons.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
memberIcons.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
// Limit the stack view's width to no more than 75% of the superview's width
// Adjust as needed
memberIcons.widthAnchor.constraint(lessThanOrEqualTo: view.widthAnchor, multiplier: 0.75).isActive = true
let width: CGFloat = 36.0
for member in story!.members
// We don't care about the frame here as we're gonna use auto layout
let circle = UIImageView(frame: .zero)
circle.translatesAutoresizingMaskIntoConstraints = false
circle.layer.cornerRadius = width / 2
circle.image = member.profilePicture
circle.contentMode = .scaleAspectFill
circle.clipsToBounds = true
circle.layer.borderWidth = 1
circle.layer.borderColor = UIColor.lightGray.cgColor
memberIcons.addArrangedSubview(circle)
circle.widthAnchor.constraint(equalToConstant: width).isActive = true
circle.heightAnchor.constraint(equalToConstant: width).isActive = true
结果:
因为我们限制了UIStackView
的宽度,所以在控制台上出现一堆自动布局错误之前,您可以添加最大数量的个人资料图像(在本例中为 7 个)。您可以将 Stack View 包含在 Scroll View 中或使用 Collection View 进行矩阵式显示。
【讨论】:
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