很多時候為了滿足需求，我們需要在UIScrollView添加UITextField庶诡，在處理鍵盤升降鍵盤事件的時候往往會寫個UIScrollView的分類奔垦，代碼

- (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];
}

后來我們的測試發(fā)現(xiàn)一個問題，當使用iOS自帶手寫鍵盤的時候輸入第一個字變灰，再點擊點擊奔潰了轮洋。

調(diào)試了很久，我發(fā)現(xiàn)手寫鍵盤在調(diào)用UIScrollView的這個分類的方法時诗越，self的類型是UIKBCandidateCollectionView砖瞧，具體是什么還沒有去蘋果官方文檔查，先屏蔽了嚷狞，代碼

- (void)touchesBegan:(NSSet<UITouch *> *)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];
        }
    }
}

解決