iOS UITableViewWrapperView在iOS 11中没有Xcode9

Question

当我使用Xcode9构建我的应用程序时，iOS11中不存在

UITableViewWrapperView。

我正在使用UITableView的{​​{1}}方法设置我的insertSubview的背景视图，当我使用Xcode8编译代码时，该代码适用于所有iOS版本，但是当我构建时使用Xcode9的相同代码然后内容是不可见的（在iOS 11上），因为背景层来自单元格。

以下是调试结果 -

1. Xcode9和iOS 11 -

   一个。在添加背景之前

   UIView

   B中。添加背景后

   ▿ 2 elements
     - 1 : <UIImageView: 0x7fe7f5f045c0; frame = (3 710.667; 408 2.33333); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x604000223f80>>
     - 2 : <UIImageView: 0x7fe7f5f01e30; frame = (408.667 3; 2.33333 385); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled> = NO; layer = <CALayer: 0x604000226720>>
   

2. Xcode8和iOS 11 - 存在UITableViewWrapperView -

   一个。在添加背景之前

   ▿ 3 elements
     - 0 : <UIView: 0x7fe7f5e09840; frame = (0 0; 414 736); layer = <CALayer: 0x60400003d780>>
     - 1 : <UIImageView: 0x7fe7f5f045c0; frame = (3 710.667; 408 2.33333); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x604000223f80>>
     - 2 : <UIImageView: 0x7fe7f5f01e30; frame = (408.667 3; 2.33333 385); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled> = NO; layer = <CALayer: 0x604000226720>>
   

   B中。添加背景后

   3 elements
     - 0 : <UITableViewWrapperView: 0x7ffdbe81cc00; frame = (0 0; 375 647); gestureRecognizers = <NSArray: 0x608000244a10>; layer => <CALayer: 0x608000028cc0>;contentOffset: {0, 0}; contentSize: {375,> 647}>
     - 1 : <UIImageView: 0x7ffdbe406af0; frame = (3 641.5; 369 2.5); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO;layer = <CALayer: 0x608000028fe0>>
     - 2 : <UIImageView: 0x7ffdbe407320; frame = (369.5 637; 2.5 7); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO;> layer = <CALayer: 0x608000029140>>
   

设置背景的方法 -

4 elements
  - 0 : <UIView: 0x7ffdbe505cc0; frame = (0 0; 375 667); layer = <CALayer: 0x60000002a460>>
  - 1 : <UITableViewWrapperView: 0x7ffdbe81cc00; frame = (0 0; 375 647); gestureRecognizers = <NSArray: 0x608000244a10>; layer =<CALayer: 0x608000028cc0>; contentOffset: {0, 0};contentSize: {375,647}>
  - 2 : <UIImageView: 0x7ffdbe40b0f0; frame = (3 641.5; 369 2.5); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO;layer = <CALayer: 0x608000029e00>>
  - 3 : <UIImageView: 0x7ffdbe40b550; frame = (369.5 637; 2.5 7); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO;layer = <CALayer: 0x608000029f00>>

在iOS11上使用Xcode8构建



在iOS11上使用Xcode9构建



我找到this链接，确认从iOS11中删除 private func setTableViewBackground() { let backgroundView = UIView() backgroundView.frame = view.frame let maskPath: UIBezierPath = UIBezierPath(roundedRect: backgroundView.bounds, byRoundingCorners: ([.topLeft, .topRight]), cornerRadii: CGSize(width:20, height:20)) let maskLayer: CAShapeLayer = CAShapeLayer() maskLayer.frame = backgroundView.bounds maskLayer.path = maskPath.cgPath backgroundView.layer.mask = maskLayer backgroundView.backgroundColor = UIColor.red myCustomTableView.insertSubview(backgroundView, at: 0) } ，但是当我们使用Xcode9编译代码时？

Answer 1

这就是为什么我不喜欢使用未记录的功能。苹果公司根据需要改变它们而不通知。 我对你的案例的建议是将表格视图放在IB中的红色基板上并应用你的代码。

NB。不要忘记将clipsToBounds属性设置为true。

该功能将更短：

private func setTableViewBackground() {
    let backgroundView = self.tableViewSubstrate!
    let maskPath: UIBezierPath = UIBezierPath(roundedRect: backgroundView.bounds, byRoundingCorners: ([.topLeft, .topRight]), cornerRadii: CGSize(width:20, height:20))
    let maskLayer: CAShapeLayer = CAShapeLayer()
    maskLayer.path = maskPath.cgPath
    backgroundView.layer.mask = maskLayer
}

您可以在此处找到示例项目：https://github.com/AlexeyGolovenkov/TableWithRoundCorners

Answer 2

检查目标构建设置。您可能正在构建最新的操作系统并从XCode 8切换到9将编译目标操作系统从10移动到11.这也可能是任何调试版本与发布版本之间的区别。您可以将XCode 9中的目标更改为iOS 10，并且会在修复问题的情况下重新编译，但您将来可能存在弃用问题。

Answer 3

尝试将myCustomTableView.insertSubview(backgroundView, at: 0)替换为

  

myCustomTableView.backgroundView = backgroundView

它对我来说很好。

Answer 4

兄弟我认为以下代码行可能对您有用。

旧代码：

 private func setTableViewBackground() {

    let backgroundView = UIView()
    backgroundView.frame = view.frame

    let maskPath: UIBezierPath = UIBezierPath(roundedRect: backgroundView.bounds, byRoundingCorners: ([.topLeft, .topRight]), cornerRadii: CGSize(width:20, height:20))

    let maskLayer: CAShapeLayer = CAShapeLayer()
    maskLayer.frame = backgroundView.bounds
    maskLayer.path = maskPath.cgPath
    backgroundView.layer.mask = maskLayer
    backgroundView.backgroundColor = UIColor.red

    myCustomTableView.insertSubview(backgroundView, at: 0)
}

替换为以下代码：

 private func setTableViewBackground() {

    let backgroundView = UIView()
    backgroundView.frame = view.frame

    let maskPath: UIBezierPath = UIBezierPath(roundedRect: backgroundView.bounds, byRoundingCorners: ([.topLeft, .topRight]), cornerRadii: CGSize(width:20, height:20))

    let maskLayer: CAShapeLayer = CAShapeLayer()
    maskLayer.frame = backgroundView.bounds
    maskLayer.path = maskPath.cgPath
    backgroundView.layer.mask = maskLayer
    backgroundView.backgroundColor = UIColor.red

    // myCustomTableView.insertSubview(backgroundView, at: 0)

    myCustomTableView.backgroundView = backgroundView
}