[英]Padding around image programmatically
我需要创建一个组件来快速显示带有标签的图像。
我创建了一个扩展UIStackView
的类,并放置了ImageView
和UILabel
并且可以正常工作。
问题 :结果很难看,我需要在UIImage
周围添加一些填充。 我试图将图像包含在比UIImage
大的UIView
,但它会使图像消失! 在运行时,显示以下警告消息:
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x60000009e820 h=--& v=--& UIImageView:0x7fea7fc02850.width == 0 (active)>",
"<NSLayoutConstraint:0x60400009b4e0 UIImageView:0x7fea7fc02850.width == 40 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60400009b4e0 UIImageView:0x7fea7fc02850.width == 40 (active)>
因此,由于我不了解的原因,图像会自动获得约束width = 0
,这会丢弃约束width = 40
这是代码:
class HeaderView: UIStackView {
var label: UILabel = UILabel()
override init(frame: CGRect) {
super.init(frame: frame)
}
required init(coder: NSCoder) {
super.init(coder: coder)
}
func setup(title: String, image: UIImage?) {
axis = UILayoutConstraintAxis.horizontal
let imgView = UIImageView()
imgView.image = image!
imgView.widthAnchor.constraint(equalToConstant: 40).isActive = true
imgView.heightAnchor.constraint(equalToConstant: 40).isActive = true
let paddedView = UIView()
paddedView.addSubview(imgView)
paddedView.widthAnchor.constraint(equalToConstant: 50).isActive = true
paddedView.heightAnchor.constraint(equalToConstant: 50).isActive = true
addArrangedSubview(paddedView)
label.text = title
addArrangedSubview(label)
}
}
translatesAutoresizingMaskIntoConstraints
设置为false,以避免与自动布局的冲突。 imgView
在paddedView
位置不明确。 这将是更好地约束边缘imgView
到paddedView
,而不是直接设置imgView
大小。 .fill
。 这是代码
func setup(title: String, image: UIImage?) {
axis = .vertical
alignment = .center
label.text = title
let imageView = UIImageView(image: image)
imageView.translatesAutoresizingMaskIntoConstraints = false
let containerView = UIView()
containerView.translatesAutoresizingMaskIntoConstraints = false
containerView.addSubview(imageView)
NSLayoutConstraint.activate([
imageView.topAnchor.constraint(equalTo: containerView.topAnchor, constant: 10.0),
imageView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor, constant: 10.0),
imageView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor, constant: -10.0),
imageView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor, constant: -10.0),
containerView.heightAnchor.constraint(equalToConstant: 50.0),
containerView.widthAnchor.constraint(equalToConstant: 50.0)
])
stackView.addArrangedSubview(containerView)
stackView.addArrangedSubview(label)
}
将imgView,paddedView和labels的translatesAutoresizingMaskIntoConstraints属性设置为false
-阿斯洛
降低宽度和高度的优先级后,给imageView top,bottomm,前导和尾随约束
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