ios - 重用之前设置为 inputAccessoryView 的 UIView 似乎不起作用

Question

我的 ViewController 包含

1. 一个 UITextView 和
2. 一个名为 bar 的简单 UIView 变量。

在textViewShouldBeginEditing()中，我从ViewController的View中删除bar并将其设置为textView的inputAccessoryView:

bar.removeFromSuperview()
textView.inputAccessoryView = bar
textView.reloadInputViews()

这按预期工作。稍后，当我调用 endEditing 时，我从 TextView 的 inputAccessoryView 中删除 bar 并将其放回到 ViewController 的 View 中，如下所示:

textView.inputAccessoryView = nil
textView.reloadInputViews()
bar.frame = CGRect(x:0,y:500,width:100,height:50)
view.addSubview(bar)

但是 bar 不会出现在 ViewController 的 View 上。这是进程结束时 bar 未出现在屏幕上时的转储:

<小时/>

bar.window:  Optional(<UIWindow: 0x7faa79608d50; frame = (0 0; 320 568); autoresize = W+H; gestureRecognizers = <NSArray: 0x600000048fa0>; layer = <UIWindowLayer: 0x600000036f20>>)

bar.superview:  Optional(<UIView: 0x7faa794141c0; frame = (0 0; 320 568); autoresize = W+H; layer = <CALayer: 0x60800023a800>>)

dump(bar): 
▿ Optional(<UIView: 0x7faa7940faf0; frame = (0 500; 100 50); layer = <CALayer: 0x608000037940>>)
  - some: <UIView: 0x7faa7940faf0; frame = (0 500; 100 50); layer = <CALayer: 0x608000037940>> #0
    - super: UIResponder
      - super: NSObject

<小时/>

我哪里出错了？

这是我的 View Controller 的代码:

class ViewController: UIViewController, UITextViewDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        bar = UIView()
        bar.frame = CGRect(x:0,y:500,width:100,height:50)
        bar.backgroundColor = UIColor.red
        //setToolBar()
        textView.delegate = self
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBOutlet weak var textView: UITextView!

    var bar: UIView!


    func setToolBar() {
        bar.frame = CGRect(x:0,y:500,width:100,height:50)
        view.addSubview(bar)
        textView.inputAccessoryView = nil
        textView.reloadInputViews()


        print("-----------------------\n");
        print("cust.window: ", bar.window)
        print("cust.superview: ", bar.superview)
        print("dump: ")
        dump(bar)
        print("\n-----------------------\n")
    }

    func dismissKeyboard() {
        self.view.endEditing(true)

        print("ABOUT TO SET TOOLBAR ")
        setToolBar()
        print("JUST SET TOOLBAR ")
    }


    func textViewShouldBeginEditing(_ textView: UITextView) -> Bool {
        bar.removeFromSuperview()
        print("here")
        dump(bar)
        textView.inputAccessoryView = bar
        textView.reloadInputViews()
        return true
    }

    func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
        if(text == "\n") {
            print("FRAME:", bar.frame)
            //textView.inputAccessoryView = nil
            //textView.inputView = nil
            //textView.reloadInputViews()

            dismissKeyboard()

            return false
        }
        return true
    }

}

Answer 1

通过将 inputAccessoryView 设置为 nil，您将释放 View ，并且当您尝试重用它时，它不再存在。首先尝试将其添加为 subview ，然后将 inputAccessoryView 设置为 nil。