最近在工作中遇到一個問題，我在UIScrollView添加子控件UITextField，但是無法在-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event方法中實現UITextField 的resignFirstResponder隱藏鍵盤的事件。測試打斷點之后發現，當我在觸摸視圖上空白的地方的時候，UITouch方法并沒有運行，在網上一查，原來是UIView的touch事件被UIScrollView捕獲。
然后，只需要給UIScrollView寫一個類擴展，讓UIScrollView將事件傳遞過去就可以了。下面上代碼

- (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];
}

-(void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [[self nextResponder] touchesCancelled:touches withEvent:event];
    [super touchesEnded:touches withEvent:event];
}

然后就在需要用的地方導入頭文件，然后再在上面的方法里面操作就可以了。