在附件上滚动时，iOS 13.1 UITextView委托方法shouldInteract会被调用 [英] iOS 13.1 UITextView delegate method shouldInteract called when scrolling on attachment

问题描述

我正在使用UITextView委托方法来执行一些自定义工作，例如当用户点击URL或附件时打开应用内浏览器:

I'm using the UITextView delegate method to do some custom work like opening a in-app browser when user tapping on URL or attachment:

func textView(_ textView: UITextView,
                  shouldInteractWith URL: URL,
                  in characterRange: NSRange,
                  interaction: UITextItemInteraction) -> Bool

在iOS 13中，即使用户只是在URL上滚动(这是不期望的)，也会调用此委托方法.此行为也适用于图像附件.

In iOS 13, this delegate method is called even when the user is just scrolling upon the URL, which is not expected. This behavior also applied to image attachment.

现在通过交互调用该deleate方法.

That deleate method now is called via the interaction.

* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 6.1 7.1
  * frame #0: 0x0000000104a54c5c ProjectS1`PostListViewController.textView(textView=0x00000001090a4600, URL=Foundation.URL @ 0x000000016b5d1200, characterRange=location=161, length=9, interaction=invokeDefaultAction, self=0x0000000109b03990) at PostListViewController.swift:610:9
    frame #1: 0x0000000104a54d70 ProjectS1`@objc PostListViewController.textView(_:shouldInteractWith:in:interaction:) at <compiler-generated>:0
    frame #2: 0x00000001b3293eec UIKitCore`-[UITextView _allowInteraction:forTextInteractableItem:] + 212
    frame #3: 0x00000001b2602160 UIKitCore`-[_UITextInteractableItem _allowInteraction:] + 140
    frame #4: 0x00000001b2601f68 UIKitCore`-[_UITextInteractableItem canInvokeDefaultAction] + 100
    frame #5: 0x00000001b31dd528 UIKitCore`-[_UITextSimpleLinkInteraction _canBeginInteractionSessionForLinkAtPoint:asTap:] + 136
    frame #6: 0x00000001b31dd3d0 UIKitCore`-[_UITextSimpleLinkInteraction interaction_gestureRecognizer:shouldReceiveTouch:] + 228
    frame #7: 0x00000001b31dc234 UIKitCore`-[UITextInteraction gestureRecognizer:shouldReceiveTouch:] + 144
    frame #8: 0x00000001b2b5f460 UIKitCore`-[UIGestureRecognizer _delegateShouldReceiveTouch:] + 452
    frame #9: 0x00000001b2b5edf4 UIKitCore`-[UIGestureRecognizer _shouldReceiveTouch:forEvent:recognizerView:] + 488
    frame #10: 0x00000001b2ffa630 UIKitCore`__56-[UITouchesEvent _addGestureRecognizersForView:toTouch:]_block_invoke + 332
    frame #11: 0x00000001b2ffa0e4 UIKitCore`__62-[UITouchesEvent _collectGestureRecognizersForView:withBlock:]_block_invoke + 408
    frame #12: 0x00000001b2ff9b58 UIKitCore`-[UITouchesEvent _collectGestureRecognizersForView:withBlock:] + 308
    frame #13: 0x00000001b2ffa4b0 UIKitCore`-[UITouchesEvent _addGestureRecognizersForView:toTouch:] + 164
    frame #14: 0x00000001b2ffa9a8 UIKitCore`-[UITouchesEvent _addTouch:forDelayedDelivery:] + 812
    frame #15: 0x00000001b300bfac UIKitCore`_AddTouchToEventAndDetermineIfNeedsCancel + 196
    frame #16: 0x00000001b300c074 UIKitCore`____updateTouchesWithDigitizerEventAndDetermineIfShouldSend_block_invoke.96 + 136
    frame #17: 0x00000001aef35b20 CoreFoundation`__NSDICTIONARY_IS_CALLING_OUT_TO_A_BLOCK__ + 24
    frame #18: 0x00000001aef360e4 CoreFoundation`____NSDictionaryEnumerate_block_invoke.11 + 56
    frame #19: 0x00000001aef07a10 CoreFoundation`CFBasicHashApply + 144
    frame #20: 0x00000001aef35c80 CoreFoundation`__NSDictionaryEnumerate + 220
    frame #21: 0x00000001b300d560 UIKitCore`__dispatchPreprocessedEventFromEventQueue + 2444
    frame #22: 0x00000001b30107dc UIKitCore`__handleEventQueueInternal + 4928
    frame #23: 0x00000001b3009960 UIKitCore`__handleHIDEventFetcherDrain + 112
    frame #24: 0x00000001aee61260 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28
    frame #25: 0x00000001aee611b4 CoreFoundation`__CFRunLoopDoSource0 + 84
    frame #26: 0x00000001aee60920 CoreFoundation`__CFRunLoopDoSources0 + 184
    frame #27: 0x00000001aee5b7ec CoreFoundation`__CFRunLoopRun + 1068
    frame #28: 0x00000001aee5b098 CoreFoundation`CFRunLoopRunSpecific + 480
    frame #29: 0x00000001b8fc5534 GraphicsServices`GSEventRunModal + 108
    frame #30: 0x00000001b2f7b7ac UIKitCore`UIApplicationMain + 1940
    frame #31: 0x0000000104b090d0 ProjectS1`main at AppDelegate.swift:25:7
    frame #32: 0x00000001aecdaf30 libdyld.dylib`start + 4

所以我的问题是，有什么办法可以知道用户是点击URL还是只是滚动URL?

So my question is that, is there any way to know whether user is tapping on the URL or just scrolling on the URL?

推荐答案

看起来textView:shouldInteractWithURL:inRange:interaction:最终在正常的链接按下期间被调用了3次(如果您总是返回YES).

It looks like textView:shouldInteractWithURL:inRange:interaction: ends up being called 3 times during a normal link press (if you always return YES).

几次，看看是否可以调用默认操作(假设这就是canInvokeDefaultAction的含义):

A couple of times to see if the default action can be invoked (assuming that's what canInvokeDefaultAction is about):

  * frame #0: 0x0000000101610038 Engage`::-[BubbleMessageCell textView:shouldInteractWithURL:inRange:interaction:](self=0x00007ff19e999600, _cmd="textView:shouldInteractWithURL:inRange:interaction:", textView=0x00007ff19eaf2000, url="https://9to5mac.com/2019/09/07/imessage-for-business/", characterRange=location=235, length=33, interaction=UITextItemInteractionInvokeDefaultAction) at BubbleMessageCell.mm:623:5
    frame #1: 0x00007fff478b2902 UIKitCore`-[UITextView _allowInteraction:forTextInteractableItem:] + 532
    frame #2: 0x00007fff46b8ba1c UIKitCore`-[_UITextInteractableItem _allowInteraction:] + 135
    frame #3: 0x00007fff46b8b84d UIKitCore`-[_UITextInteractableItem canInvokeDefaultAction] + 97
    frame #4: 0x00007fff477f76f7 UIKitCore`-[_UITextSimpleLinkInteraction _canBeginInteractionSessionForLinkAtPoint:asTap:] + 127
    frame #5: 0x00007fff477f75c7 UIKitCore`-[_UITextSimpleLinkInteraction interaction_gestureRecognizer:shouldReceiveTouch:] + 217
    frame #6: 0x00007fff477f6506 UIKitCore`-[UITextInteraction gestureRecognizer:shouldReceiveTouch:] + 127
    frame #7: 0x00007fff47133669 UIKitCore`-[UIGestureRecognizer _delegateShouldReceiveTouch:] + 493

  * frame #0: 0x0000000101610038 Engage`::-[BubbleMessageCell textView:shouldInteractWithURL:inRange:interaction:](self=0x00007ff19e999600, _cmd="textView:shouldInteractWithURL:inRange:interaction:", textView=0x00007ff19eaf2000, url="https://9to5mac.com/2019/09/07/imessage-for-business/", characterRange=location=235, length=33, interaction=UITextItemInteractionInvokeDefaultAction) at BubbleMessageCell.mm:623:5
    frame #1: 0x00007fff478b2902 UIKitCore`-[UITextView _allowInteraction:forTextInteractableItem:] + 532
    frame #2: 0x00007fff46b8ba1c UIKitCore`-[_UITextInteractableItem _allowInteraction:] + 135
    frame #3: 0x00007fff46b8b84d UIKitCore`-[_UITextInteractableItem canInvokeDefaultAction] + 97
    frame #4: 0x00007fff477f77fb UIKitCore`-[_UITextSimpleLinkInteraction _beginInteractionSessionForLinkAtPoint:asTap:] + 167
    frame #5: 0x00007fff477f74d0 UIKitCore`-[_UITextSimpleLinkInteraction interaction_gestureRecognizerShouldBegin:] + 196
    frame #6: 0x00007fff477f62a1 UIKitCore`-[UITextInteraction gestureRecognizerShouldBegin:] + 307
    frame #7: 0x00007fff471339b6 UIKitCore`-[UIGestureRecognizer _shouldBegin] + 413

然后最终当实际识别出手势时:

And then finally when the gesture is actually recognized:

  * frame #0: 0x0000000101610038 Engage`::-[BubbleMessageCell textView:shouldInteractWithURL:inRange:interaction:](self=0x00007ff19e999600, _cmd="textView:shouldInteractWithURL:inRange:interaction:", textView=0x00007ff19eaf2000, url="https://9to5mac.com/2019/09/07/imessage-for-business/", characterRange=location=235, length=33, interaction=UITextItemInteractionInvokeDefaultAction) at BubbleMessageCell.mm:623:5
    frame #1: 0x00007fff478b2902 UIKitCore`-[UITextView _allowInteraction:forTextInteractableItem:] + 532
    frame #2: 0x00007fff46b8ba1c UIKitCore`-[_UITextInteractableItem _allowInteraction:] + 135
    frame #3: 0x00007fff46b8b8cc UIKitCore`-[_UITextInteractableItem invokeDefaultAction] + 94
    frame #4: 0x00007fff477f6f32 UIKitCore`-[_UITextSimpleLinkInteraction linkTapped:] + 188
    frame #5: 0x00007fff4712bbfb UIKitCore`-[UIGestureRecognizerTarget _sendActionWithGestureRecognizer:] + 44

滚动时，只有第一个呼叫发生.

When scrolling, only the first call happens.

这可能是iOS 13.1的更改，它将在此位置进行更早的检查以查看链接是否可以与之交互.如果希望textView:shouldInteractWithURL:inRange:interaction:具有副作用，则只希望在实际识别出手势后才做.

This is presumably an iOS 13.1 change, where it checks sooner to see if the link can be interacted with. If you want textView:shouldInteractWithURL:inRange:interaction: to have side effects, you only want to do them when the gesture is actually recognized.

对于我们来说，检查textView.gestureRecognizers似乎有用，并且仅在识别到轻击手势时才执行自定义操作.

What appears to work for us to to check textView.gestureRecognizers and only do the custom actions if a tap gesture was being recognized.

    BOOL recognizedTapGesture = NO;
    for (UIGestureRecognizer *recognizer in textView.gestureRecognizers) {
        if ([recognizer isKindOfClass:UITapGestureRecognizer.class] && recognizer.state == UIGestureRecognizerStateEnded) {
            recognizedTapGesture = YES;
            break;
        }
    }
    if (!recognizedTapGesture) {
        // Tap gesture is not being recognized, this must be an early 
        // check when touches begin. Leave the link handling alone.
        return YES;
    }

    // Do custom action here

    return NO;

这篇关于在附件上滚动时，iOS 13.1 UITextView委托方法shouldInteract会被调用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！