ios – UIWebView Bug： – [UIWebView cut：]：无法识别的选择器发送到实例

概述

在UIWebView中,如果包含文本的输入元素具有焦点,并且按下一个导致输入失焦的按钮,则随后双击输入以重新获得焦点,然后从弹出式栏中选择“剪切(或复制或粘贴)”这样会导致UIWebView崩溃与错误： -[UIWebView cut:]: unrecognized selector sent to instance 0x10900ca60 演示项目：https://github.com/guar

在UIWebVIEw中,如果包含文本的输入元素具有焦点,并且按下一个导致输入失焦的按钮,则随后双击输入以重新获得焦点,然后从弹出式栏中选择“剪切(或复制或粘贴)”这样会导致UIWebVIEw崩溃与错误：

-[UIWebVIEw cut:]: unrecognized selector sent to instance 0x10900ca60

演示项目：https://github.com/guarani/WebViewDoubleTapTestTests.git

我觉得这一定是UIWebVIEw的BUG,有什么想法吗？

为了完整,这里是我的网页视图的内容,

<HTML>
    <head>
    </head>
    <body>
        <br><br>
        <input type="text">
        <input type="button">
    </body>
</HTML>

在Apple提交了一个错误报告：15894403

更新2014/10/15：BUG仍然存在于iOS 8.0.2(12A405)

解决方法

这是一个苹果BUG.问题是剪切：操作在响应者链中发送不正确,最终被发送到UIWebVIEw实例,而不是实现该方法的内部UIWebdocumentVIEw.

直到Apple修复了这个 BUG,让我们来看看Objective C的运行时间.

在这里,我将UIWebVIEw子类化,以支持所有的UIResponderStandardEditactions方法,将它们转发到正确的内部实例.

@import ObjectiveC;    

@interface CutcopyPasteFixeDWebVIEw : UIWebVIEw @end

@implementation CutcopyPasteFixeDWebVIEw

- (UIVIEw*)_internalVIEw
{
    UIVIEw* internalVIEw = objc_getAssociatedobject(self,"__internal_vIEw_key");

    if(internalVIEw == nil && self.subvIEws.count > 0)
    {
        for (UIVIEw* vIEw in self.scrollVIEw.subvIEws) {
            if([vIEw.class.description hasPrefix:@"UIWeb"])
            {
                internalVIEw = vIEw;

                objc_setAssociatedobject(self,"__internal_vIEw_key",vIEw,OBJC_ASSOCIATION_ASSIGN);

                break;
            }
        }
    }

    return internalVIEw;
}

voID webVIEw_implement_UIResponderStandardEditactions(ID self,SEL selector,ID param)
{
    voID (*method)(ID,SEL,ID) = (voID(*)(ID,ID))[[self _internalVIEw] methodForSelector:selector];

    //Call internal implementation.
    method([self _internalVIEw],selector,param);
}

- (voID)_prepareForNoCrashes
{
    NSArray* selectors = @[@"cut:",@"copy:",@"paste:",@"select:",@"selectAll:",@"delete:",@"makeTextWritingDirectionleftToRight:",@"makeTextWritingDirectionRightToleft:",@"toggleBoldface:",@"toggleItalics:",@"toggleUnderline:",@"increaseSize:",@"decreaseSize:"];

    for (Nsstring* selname in selectors)
    {
        SEL selector = NSSelectorFromString(selname);

        //This is safe,the method will fail if there is already an implementation.
        class_addMethod(self.class,(IMP)webVIEw_implement_UIResponderStandardEditactions,"");
    }
}

- (voID)awakeFromNib
{
    [self _prepareForNoCrashes];

    [super awakeFromNib];
}

@end