當設置layer.borderColor時，UICollectionViewCell邊框消失

Question

我正在嘗試向@IBDesignable UICollectionViewCell原型添加一個薄的彩色邊框。在故事板中，我設置了layer.cornerRadius,layer.masksToBounds和layer.borderWidth用戶定義的屬性，並且邊框按預期顯示。

但是，如果我還設置自定義layer.borderColor，整個邊框，半徑和口罩從故事板消失。在模擬器中，拐角半徑（和掩模，大概）會出現，但邊界不會。

我也嘗試以編程方式設置它們，但作爲this year-old, unanswered StackOverflow question顯示，不工作，要麼。

下面是該小區的代碼，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? 

} 

和相關部分的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是一個自定義集合視圖的數據源和委託這由NSFetchedResultsController支持，而MasterRelease是受管理的對象。我儘量保持這個東西儘可能簡單。

Answer 1

您面臨的問題是您正在使用Boolean值爲layer.borderColor您必須改用Color。但無論如何，這不工作，因爲layer.borderColor你需要一個cgColor所以我認爲你需要定義一個@IBInspectable VAR爲BORDERCOLOR和代碼做到這一點

@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? 

} 

然後你就可以做到這一點的故事板

希望這有助於