[英]Tableview cell border not occupying full width in swift
我正在嘗試在我的表格視圖單元格的所有邊上添加一個邊框,我能夠添加邊框,但面臨一個問題,即右側的邊框沒有占據單元格的整個寬度,如下面的屏幕截圖所示。 單元格邊框似乎采用了設置 storyboard UI 的初始寬度,例如,我已將 UI 設置為 iPhone SE,但如果我在 iPhone 11 上運行,則會出現此問題。 似乎是布局未刷新的一些問題。 我嘗試添加 setNeedsLayout、setNeedsDisplay 和 layoutSubviews,但它們似乎都不起作用。
Storyboard布局
以下是完整代碼
class ViewController: UIViewController {
var dataSource = [String] ()
override func viewDidLoad() {
super.viewDidLoad()
for index in 1...10 {
dataSource.append("Cell value \(index)")
}
}
}
extension ViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return dataSource.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell: MyTableViewCell = tableView.dequeueReusableCell(withIdentifier: "MyTableViewCell", for: indexPath) as? MyTableViewCell else{return UITableViewCell()}
cell.titleLabel.text = dataSource[indexPath.row]
if indexPath.row == 0 {
cell.containerView.addBorder(toEdges: [.left, .top, .right], color: .gray, thickness: 1.0)
} else if indexPath.row == dataSource.count - 1 {
cell.containerView.addBorder(toEdges: .all, color: .gray, thickness: 1.0)
} else {
cell.containerView.addBorder(toEdges: [.left, .top, .right], color: .gray, thickness: 1.0)
}
return cell
}
}
class MyTableViewCell: UITableViewCell {
@IBOutlet weak var titleLabel: UILabel!
@IBOutlet weak var containerView: UIView!
}
extension UIView {
func addBorder(toEdges edges: UIRectEdge, color: UIColor, thickness: CGFloat) {
func addBorder(toEdge edges: UIRectEdge, color: UIColor, thickness: CGFloat) {
let border = CALayer()
border.backgroundColor = color.cgColor
switch edges {
case .top:
border.frame = CGRect(x: 0, y: 0, width: frame.width, height: thickness)
case .bottom:
border.frame = CGRect(x: 0, y: frame.height - thickness, width: frame.width, height: thickness)
case .left:
border.frame = CGRect(x: 0, y: 0, width: thickness, height: frame.height)
case .right:
border.frame = CGRect(x: frame.width - thickness, y: 0, width: thickness, height: frame.height)
default:
break
}
layer.addSublayer(border)
}
if edges.contains(.top) || edges.contains(.all) {
addBorder(toEdge: .top, color: color, thickness: thickness)
}
if edges.contains(.bottom) || edges.contains(.all) {
addBorder(toEdge: .bottom, color: color, thickness: thickness)
}
if edges.contains(.left) || edges.contains(.all) {
addBorder(toEdge: .left, color: color, thickness: thickness)
}
if edges.contains(.right) || edges.contains(.all) {
addBorder(toEdge: .right, color: color, thickness: thickness)
}
}
}
您可能會發現使用UIView
子類來處理“邊緣”要容易得多。
將此 class 添加到您的項目中:
class BorderedView: UIView {
var edges: UIRectEdge = []
var color: UIColor = .clear
var thickness: CGFloat = 0
var shapeLayer: CAShapeLayer!
override class var layerClass: AnyClass {
return CAShapeLayer.self
}
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
commonInit()
}
func commonInit() -> Void {
shapeLayer = self.layer as? CAShapeLayer
shapeLayer.fillColor = UIColor.clear.cgColor
}
override func layoutSubviews() {
super.layoutSubviews()
let pth = UIBezierPath()
if edges.contains(.top) || edges.contains(.all) {
pth.move(to: CGPoint(x: bounds.minX, y: bounds.minY))
pth.addLine(to: CGPoint(x: bounds.maxX, y: bounds.minY))
}
if edges.contains(.bottom) || edges.contains(.all) {
pth.move(to: CGPoint(x: bounds.minX, y: bounds.maxY))
pth.addLine(to: CGPoint(x: bounds.maxX, y: bounds.maxY))
}
if edges.contains(.left) || edges.contains(.all) {
pth.move(to: CGPoint(x: bounds.minX, y: bounds.minY))
pth.addLine(to: CGPoint(x: bounds.minX, y: bounds.maxY))
}
if edges.contains(.right) || edges.contains(.all) {
pth.move(to: CGPoint(x: bounds.maxX, y: bounds.minY))
pth.addLine(to: CGPoint(x: bounds.maxX, y: bounds.maxY))
}
shapeLayer.lineWidth = thickness
shapeLayer.strokeColor = color.cgColor
shapeLayer.path = pth.cgPath
}
}
然后將您的containerView
的 Custom Class 分配給BorderedView
。 在您的單元 class 中正常連接它:
@IBOutlet weak var containerView: BorderedView!
將您的單元格 class 更改為:
class MyTableViewCell: UITableViewCell {
@IBOutlet weak var titleLabel: UILabel!
@IBOutlet weak var containerView: BorderedView!
func configureContainer(toEdges edges: UIRectEdge, color: UIColor, thickness: CGFloat) -> Void {
containerView.edges = edges
containerView.color = color
containerView.thickness = thickness
}
}
然后,在cellForRowAt
中,而不是調用:
cell.containerView.addBorder(toEdges: [.left, .top, .right], color: .gray, thickness: 1.0)
像這樣稱呼它:
cell.configureContainer(toEdges: [.left, .top, .right], color: .gray, thickness: 1.0)
結果 - 表格視圖在每側插入 8 分,因此您可以看到左/右邊緣:
當 tableView/cells 改變大小時(比如在設備旋轉時),邊緣會自動更新:
我同意@Asperi 的回答。 要么你必須繼承它並在drawrect中編寫這個方法。 或者為了快速解決方案,將 frame.width 更改為 UIScreen.main.bounds.width.Check 它將適用於您當前的要求和當前代碼。
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