我已经遇到这个问题好几个星期了，我想我无法解决它。
我有一个 tableView，它有自定义的 tableViewCell，并且它们充满了数据。 tableViewCell 有两个 UILabel 和一个 UIView。
当我多次滚动 UIView 上的绘图时出现问题，我认为它们被重绘了。我知道这种行为是因为单元格的重用，但我什至无法找到问题的根源。
UIViews show perfectly when opening the app
UIViews get overlapped after scrolling
我的 UITableView 的 cellForRowAtIndexPath 是:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let CellIdentifier = "Cell"
let cell: CustomTableViewcell = self.tableView.dequeueReusableCellWithIdentifier(CellIdentifier, forIndexPath: indexPath) as! CustomTableViewcell
//self.tableView.dequeueReusableCellWithIdentifier(CellIdentifier) as! CustomTableViewcell
cell.prepareForReuse()
self.createUIForCell(cell)
self.configureCell(cell, indexPath: indexPath)
print("\t\(parsedData[indexPath.row].stationName): \(parsedData[indexPath.row].freeBikes)")
return cell
}
func createUIForCell(cell: CustomTableViewcell) {
cell.distanceLabel.textColor = UIColor.whiteColor()
cell.distanceLabel.backgroundColor = UIColor.clearColor()
cell.bikeStationLabel.textColor = UIColor.whiteColor()
cell.bikeStationLabel.backgroundColor = UIColor.clearColor()
}
func configureCell(cell: CustomTableViewcell, indexPath: NSIndexPath) {
let stations = parsedData[indexPath.row]
if indexPath.row % 2 == 0 {
cell.stackView.arrangedSubviews.first!.backgroundColor = cellBackgroundColor1
cell.progressView.backgroundColor = cellBackgroundColor2
} else {
cell.stackView.arrangedSubviews.first!.backgroundColor = cellBackgroundColor2
cell.progressView.backgroundColor = cellBackgroundColor1
}
cell.progressView.getWidth(stations.freeBikes, freeDocks: stations.freeDocks)
cell.getLocation(stations.latitude, longitude: stations.longitude)
cell.getParameters(stations.freeBikes, freeDocks: stations.freeDocks)
cell.bikeStationLabel.text = stations.stationName
if stations.distanceToLocation != nil {
if stations.distanceToLocation! < 1000 {
cell.distanceLabel.text = String(format: "%.f m", stations.distanceToLocation!)
} else {
cell.distanceLabel.text = String(format: "%.1f km", stations.distanceToLocation! / 1000)
}
} else {
cell.distanceLabel.text = ""
}
}
对于前面提到的在我的自定义单元格中的 UIVIew，我已经为它创建了一个单独的类来处理绘图，它看起来像这样:
import UIKit
class ProgressViewBar: UIView {
var freeBikes = 0
var freeDocks = 0
var text: UILabel? = nil
var text2: UILabel? = nil
func getWidth(freeBikes: Int, freeDocks: Int) {
self.freeBikes = freeBikes
self.freeDocks = freeDocks
}
override func drawRect(rect: CGRect) {
let path = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: rect.width * (CGFloat(freeBikes) / (CGFloat(freeBikes) + CGFloat(freeDocks))), height: frame.height), cornerRadius: 0)
let shapeLayer = CAShapeLayer()
shapeLayer.path = path.CGPath
shapeLayer.strokeColor = UIColor.whiteColor().CGColor
shapeLayer.fillColor = UIColor.whiteColor().CGColor
self.layer.addSublayer(shapeLayer)
drawText(rect)
}
func drawText(rect: CGRect) {
if freeBikes != 0 {
text?.removeFromSuperview()
text = UILabel(frame: CGRect(x: 2, y: 0, width: 20, height: 20))
text!.text = String("\(freeBikes)")
text!.textAlignment = NSTextAlignment.Left
text!.font = UIFont(name: "HelveticaNeue-Thin", size: 17)
text!.backgroundColor = UIColor.clearColor()
text!.textColor = UIColor(red: 1/255, green: 87/255, blue: 155/255, alpha: 1)
self.addSubview(text!)
}
text2?.removeFromSuperview()
text2 = UILabel(frame: CGRect(x: rect.width * (CGFloat(freeBikes) / (CGFloat(freeBikes) + CGFloat(freeDocks))) + 2, y: 0, width: 20, height: 20))
text2!.text = String("\(freeDocks)")
text2!.textAlignment = NSTextAlignment.Left
text2!.font = UIFont(name: "HelveticaNeue-Thin", size: 17)
text2!.backgroundColor = UIColor.clearColor()
text2!.textColor = UIColor.whiteColor()
self.addSubview(text2!)
}
}
View 需要绘制两个参数，我使用 func getWidth(freeBikes: Int, freeDocks: Int) 方法从 `ViewController.如果需要任何其他代码，您可以查看 repo .
最佳答案
问题是，当您再次调用 drawRect 并且不清除已绘制的矩形时，重新使用该单元格。在绘制另一个之前清除它。
关于ios - UITableViewCell 被重用并在 UIView 中显示错误的绘图，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39078466/