1、問題描述：通過手寫鍵盤操作的時(shí)候略荡，鍵盤下面會(huì)出現(xiàn)灰色的條塊，然后點(diǎn)擊屏幕的任何位置應(yīng)用直接崩潰锈遥。
2箱锐、問題截圖：

崩潰截圖.jpg

3竭翠、問題分析：
有一個(gè)用scrollview做的一個(gè)編號(hào)輸入頁面嘉汰，只要在填寫時(shí)皿曲，切換到手寫輸入法，手寫之后就會(huì)crash肛度，然后錯(cuò)誤提示：[UIKBBlurredKeyView candidateList]: unrecognized selector sent to instance傻唾，之前從來沒遇到過這種錯(cuò)誤，一直不知所措承耿。
由于之前開發(fā)的時(shí)候，為了讓填寫表單是彈出的鍵盤能點(diǎn)擊空白處收回鍵盤伪煤，就給scrollview寫了一個(gè)分類加袋，重寫了三個(gè)方法。

• (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
  [[self nextResponder] touchesBegan:touches withEvent:event];
  [super touchesBegan:touches withEvent:event];
  }

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [[self nextResponder] touchesBegan:touches withEvent:event];
    [super touchesBegan:touches withEvent:event];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    [[self nextResponder] touchesMoved:touches withEvent:event];
    [super touchesMoved:touches withEvent:event];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [[self nextResponder] touchesEnded:touches withEvent:event];
    [super touchesEnded:touches withEvent:event];
}

手寫輸入法和這個(gè)分類處理手勢(shì)沖突導(dǎo)致app crash了抱既。調(diào)試了很久职烧，我發(fā)現(xiàn)手寫鍵盤在調(diào)用UIScrollView的這個(gè)分類的方法時(shí)，self的類型是UIKBCandidateCollectionView，一種系統(tǒng)沒有暴露出來的類型蚀之，應(yīng)該是UIScrollView的一個(gè)子類蝗敢，所以解決辦法就呼之欲出了，直接上代碼足删。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    if (![self isMemberOfClass:[UIScrollView class]]) {

    } else {
        [[self nextResponder] touchesBegan:touches withEvent:event];
        if ([super respondsToSelector:@selector(touchesBegan:withEvent:)]) {
            [super touchesBegan:touches withEvent:event];
        }
    }
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    if (![self isMemberOfClass:[UIScrollView class]]) {

    } else {
        [[self nextResponder] touchesMoved:touches withEvent:event];
        if ([super respondsToSelector:@selector(touchesBegan:withEvent:)]) {
            [super touchesMoved:touches withEvent:event];
        }
    }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    if (![self isMemberOfClass:[UIScrollView class]]) {

    } else {
        [[self nextResponder] touchesEnded:touches withEvent:event];
        if ([super respondsToSelector:@selector(touchesBegan:withEvent:)]) {
            [super touchesEnded:touches withEvent:event];
        }
    }
}