当设置layer.borderColor时，UICollectionViewCell边框消失

Question

我正在尝试向@IBDesignable UICollectionViewCell原型添加一个薄的彩色边框。在故事板中，我设置了layer.cornerRadius,layer.masksToBounds和layer.borderWidth用户定义的属性，并且边框按预期显示。

但是，如果我还设置自定义layer.borderColor，整个边框，半径和口罩从故事板消失。在模拟器中，拐角半径（和掩模，大概）会出现，但边界不会。

我也尝试以编程方式设置它们，但作为this year-old, unanswered StackOverflow question显示，不工作，要么。

下面是该小区的代码，如要求：

@IBDesignable open class ReleaseSpineCell: UICollectionViewCell { 

    public var masterRelease: MasterRelease? { 
     didSet { 
      artistName = masterRelease?.artistName 
      title = masterRelease?.title 
      catalogNumber = "none" 
     } 
    } 

    @IBInspectable public var artistName: String? { 
     didSet { 
      artistLabel?.text = artistName 
     } 
    } 

    @IBInspectable public var title: String? { 
     didSet { 
      titleLabel?.text = title 
     } 
    } 

    @IBInspectable public var catalogNumber: String? { 
     didSet { 
      catalogLabel?.text = catalogNumber 
     } 
    } 

    @IBOutlet private weak var artistLabel: UILabel? 
    @IBOutlet private weak var titleLabel: UILabel? 
    @IBOutlet private weak var catalogLabel: UILabel? 

} 

和相关部分的UICollectionViewController的dataSource：

class CollectionModel: FetchedResultsCollectionModel { 

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { 
     let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "spineCell", for: indexPath) as! ReleaseSpineCell 
     cell.masterRelease = fetchedResultsController?.fetchedObjects?[indexPath.row] as? MasterRelease 

     return cell 
    } 
} 

FetchedResultsCollectionModel是一个自定义集合视图的数据源和委托这由NSFetchedResultsController支持，而MasterRelease是受管理的对象。我尽量保持这个东西尽可能简单。

Answer 1

您面临的问题是您正在使用Boolean值为layer.borderColor您必须改用Color。但无论如何，这不工作，因为layer.borderColor你需要一个cgColor所以我认为你需要定义一个@IBInspectable VAR为BORDERCOLOR和代码做到这一点

@IBDesignable open class ReleaseSpineCell: UICollectionViewCell { 

    public var masterRelease: MasterRelease? { 
     didSet { 
      artistName = masterRelease?.artistName 
      title = masterRelease?.title 
      catalogNumber = "none" 
     } 
    } 

    @IBInspectable public var artistName: String? { 
     didSet { 
      artistLabel?.text = artistName 
     } 
    } 

    @IBInspectable public var title: String? { 
     didSet { 
      titleLabel?.text = title 
     } 
    } 

    @IBInspectable public var catalogNumber: String? { 
     didSet { 
      catalogLabel?.text = catalogNumber 
     } 
    } 

    //added this inspectable property 
    @IBInspectable public var borderColor: UIColor? { 
     didSet { 
      self.layer.borderColor = borderColor!.cgColor 
     } 
    } 

    @IBOutlet private weak var artistLabel: UILabel? 
    @IBOutlet private weak var titleLabel: UILabel? 
    @IBOutlet private weak var catalogLabel: UILabel? 

} 

然后你就可以做到这一点的故事板

希望这有助于