无法在iOS 9 beta / 9.3上更改WKWebView的滚动速率 [英] Cannot change WKWebView's scroll rate on iOS 9 beta / 9.3

问题描述

在iOS 8上，下面的代码工作正常，它可以更惯性地滚动。

On iOS 8, the below code works fine, it can scroll with more inertia.

webView.scrollView.decelerationRate = UIScrollViewDecelerationRateNormal;

对于iOS 9 beta 3，即使没有错误，此代码也毫无意义。

这是一个错误还是还有其他方法吗？

As for iOS 9 beta 3, this code is meaningless, even without an error.
Is this a bug or are there any other ways around?

注意：UIWebView的滚动速率可以在两个版本上更改两种类型。

Note: UIWebView's scroll rate can be changed two types on both versions.

推荐答案

更新：这已经修复但未在iOS 9.3中部署（请参阅下面的解决方法）。更多细节：

Update: this has been fixed but not deployed in iOS 9.3 (see workaround below). More detail here:

• https://bugs.webkit.org/show_bug.cgi?id=148086


• http://trac.webkit.org/changeset/188541/trunk/Source/WebKit2/UIProcess/ios/ WKScrollView.mm

• https://bugs.webkit.org/show_bug.cgi?id=148086
• http://trac.webkit.org/changeset/188541/trunk/Source/WebKit2/UIProcess/ios/WKScrollView.mm

我有同样的问题，似乎是iOS 9中的一个错误。

I had the same issue and it seems to be a bug in iOS 9.

解决方法是在将开始拖动委托而不是在实例化时设置它：

The workaround is to set it in the will begin dragging delegate instead of at the time of instantiation:

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    scrollView.decelerationRate = UIScrollViewDecelerationRateNormal;
}

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