ios - 每当激活带有链接的 TextView 时，应用程序就会崩溃并出现画外音

Question

堆栈跟踪:

* thread #1: tid = 0x1ee50f, 0x00000001096f5d05 libswiftFoundation.dylib`static Foundation.DateComponents._unconditionallyBridgeFromObjectiveC (Swift.Optional<__ObjC.NSDateComponents>) -> Foundation.DateComponents with unmangled suffix "_merged" + 85, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
frame #0: 0x00000001096f5d05 libswiftFoundation.dylib`static Foundation.DateComponents._unconditionallyBridgeFromObjectiveC (Swift.Optional<__ObjC.NSDateComponents>) -> Foundation.DateComponents with unmangled suffix "_merged" + 85
frame #1: 0x000000010558e36f Invest`@objc InvestDashboard.textView(UITextView, shouldInteractWith : URL, in : _NSRange) -> Bool + 79 at InvestDashboard.swift:0
frame #2: 0x000000011fd478fc UIKit`-[UITextViewAccessibility accessibilityActivate] + 838
frame #3: 0x000000011fed29d2 UIAccessibility`-[NSObject(UIStorage) accessibilityPerformAction:withValue:fencePort:] + 1448
frame #4: 0x000000011feaa63d UIAccessibility`_performActionCallback + 163
frame #5: 0x000000011fc0cec4 AXRuntime`_AXXMIGPerformAction + 107
frame #6: 0x000000011fc06f06 AXRuntime`_XPerformAction + 216
frame #7: 0x000000011fc16541 AXRuntime`mshMIGPerform + 266
frame #8: 0x0000000106d1ff89 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
frame #9: 0x0000000106d1ff01 CoreFoundation`__CFRunLoopDoSource1 + 465
frame #10: 0x0000000106d18045 CoreFoundation`__CFRunLoopRun + 2389
frame #11: 0x0000000106d17494 CoreFoundation`CFRunLoopRunSpecific + 420
frame #12: 0x000000010cc38a6f GraphicsServices`GSEventRunModal + 161
frame #13: 0x00000001078c2964 UIKit`UIApplicationMain + 159
frame #14: 0x000000010467e99f InvestDemo`main + 111 at AppDelegate.swift:29
frame #15: 0x000000010b88268d libdyld.dylib`start + 1
frame #16: 0x000000010b88268d libdyld.dylib`start + 1

每当我在其中包含链接的 TextView 上使用 activate 时，就会发生这种情况。我已经尝试了很多不同的事情，比如重写 accessibilityActivate() -> Bool 但在调用此方法之前应用程序崩溃了。有什么建议吗？

Answer 1

我解决了这个问题并想分享，以便其他有同样令人困惑的问题的人可以解决它。

首先要做的是继承 UITextView 并在该子类中覆盖 func accessibilityActivate() -> Bool。然后创建一个委托(delegate)来处理激活 TextView 时发生的事情，并通过覆盖的方法调用它。

然后根据 UIAccessibilityIsVoiceOverRunning() 设置 TextView 的委托(delegate)，因此如果语音正在运行，则将 UITextViewDelegate 设置为 nil防止崩溃发生，然后激活操作由您在上面的子类中覆盖的方法处理。最后，为UIAccessibilityVoiceOverStatusChanged设置一个监听器，设置从off到on时的UITextViewDelegate为nil，并设置为原来的委托(delegate)类对于相反的情况。

部分代码:

//: Playground - noun: a place where people can play

import UIKit

class Test : UITabBarController, UITextViewDelegate, ActivationDelegate {

    var voiceOverRunning : Bool {
        get {
            return UIAccessibilityIsVoiceOverRunning()
        }
    }

    var testView = AccessibilityView()

    override func viewDidLoad() {
        if !voiceOverRunning {
            testView.delegate = self
        } else {
            testView.activationDelegate = self
        }

        NotificationCenter.default.addObserver(
            self,
            selector: #selector(self.didChangeVoiceOver),
            name: NSNotification.Name(rawValue: UIAccessibilityVoiceOverStatusChanged),
            object: nil)
    }

    func doStuff() {
        /*
         Do what you want to happen here on activation
         */
    }


    @objc
    func didChangeVoiceOver(){
        testView.delegate              = voiceOverRunning ? nil : self
        testView.activationDelegate    = voiceOverRunning ? self : nil
    }


}

protocol ActivationDelegate : class {
    func doStuff()
}
class AccessibilityView : UITextView {

    var activationDelegate : ActivationDelegate!

    override func accessibilityActivate() -> Bool {
        activationDelegate.doStuff()
        return true
    }
}