Question

不理解为什么我的属性重置为指定的原始值（0.1）。我从外部方法传入0.5的fillHeight。该属性在easy init中设置，但不会转移到drawRect。我错过了什么？

import UIKit

class MyView: UIView {

  var fillHeight: CGFloat = 0.1

  override init(frame: CGRect) {
    super.init(frame: frame)

  }
  convenience init(fillHeight: CGFloat) {

    self.init()
    self.fillHeight = fillHeight
    print("self.fillHeight: \(self.fillHeight) and fillHeight: \(fillHeight)")

  }
  required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)!

  }

  override func drawRect(rect: CGRect) {

    print("drawRect self.fillHeight: \(self.fillHeight)")
    // custom stuff
  }

}

控制台上的输出：

outsideAmount：可选（0.5）

self.fillHeight：0.5和fillHeight：0.5

drawRect self.fillHeight：0.1

编辑：外部调用来自UITableViewController，带有自定义UITableViewCell。图像是针对细胞的。

func configureCell(cell: CustomTableViewCell, atIndexPath indexPath: NSIndexPath) {

    let myObject = self.fetchedResultsController.objectAtIndexPath(indexPath) as! MyObject

    cell.nameLabel.text = myObject.name
    cell.strengthLabel.text = myObject.strength

    cell.myView = MyView(fillHeight: CGFloat(myObject.fillAmount!))
    ...

更多编辑：

import UIKit

class CustomTableViewCell: UITableViewCell {

  @IBOutlet weak var nameLabel: UILabel!
  @IBOutlet weak var strengthLabel: UILabel!
  @IBOutlet weak var myView: MyView!


    override func awakeFromNib() {
        super.awakeFromNib()

    }

    override func setSelected(selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }

}

Answer 1

问题是您在配置单元时分配新的MyView实例。您不必这样做，因为视图已经存在（因为您在nib中添加了它）。

所以只需在单元格的fillHeight上设置myView即可。这解决了问题：

func configureCell(cell: CustomTableViewCell, atIndexPath indexPath: NSIndexPath) {
    let myObject = self.fetchedResultsController.objectAtIndexPath(indexPath) as! MyObject
    cell.nameLabel.text = myObject.name
    cell.strengthLabel.text = myObject.strength
    cell.myView.fillHeight = CGFloat(myObject.fillAmount!)
    ....
}

在UIView中将属性传递给drawRect时遇到问题

1 个答案: