Question

我有这个问题，希望你能帮助我。

这是我在viewForHeaderInSection中的代码：

let button = UIButton(frame: CGRect(x: view.frame.width - (cancel.frame.width + xImage.frame.width + 100), y: view.frame.origin.y, width: cancel.frame.width + xImage.frame.width + 120, height: view.frame.height))
button.backgroundColor = UIColor.blue.withAlphaComponent(0.5)
button.addTarget(self, action: #selector(action), for: .touchUpInside)
view.addSubview(button)

这是action func：

@objc func action(sender: UIButton) {
    let position: CGPoint = sender.convert(CGPoint.zero, to: self.tableView)
    if let indexPath = self.tableView.indexPathForRow(at: position) {
        let section = indexPath.section
        print(section)
    }
}

现在，如果我点击除第一个标题（标题0）之外的每个标题，它将打印正确的部分。如何让它检测标题0呢？

Answer 1

如果您想知道哪个是按钮的部分，您可以将该部分分配给按钮的标签，例如：

在/** * Returns whether RecyclerView is currently computing a layout. * <p> * If this method returns true, it means that RecyclerView is in a lockdown state and any * attempt to update adapter contents will result in an exception because adapter contents * cannot be changed while RecyclerView is trying to compute the layout. * <p> * It is very unlikely that your code will be running during this state as it is * called by the framework when a layout traversal happens or RecyclerView starts to scroll * in response to system events (touch, accessibility etc). * <p> * This case may happen if you have some custom logic to change adapter contents in * response to a View callback (e.g. focus change callback) which might be triggered during a * layout calculation. In these cases, you should just postpone the change using a Handler or a * similar mechanism. * * @return <code>true</code> if RecyclerView is currently computing a layout, <code>false</code> * otherwise */ public boolean isComputingLayout() { return mLayoutOrScrollCounter > 0; }

中

viewForHeaderInSection

然后在行动中：

func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
   let button = UIButton(frame: CGRect(x: view.frame.width - (cancel.frame.width + xImage.frame.width + 100), y: view.frame.origin.y, width: cancel.frame.width + xImage.frame.width + 120, height: view.frame.height))
   button.backgroundColor = UIColor.blue.withAlphaComponent(0.5)
   button.addTarget(self, action: #selector(action), for: .touchUpInside)
   view.addSubview(button)
   button.tag = section // this is the trick
}

tableViewheader中的按钮无法识别标题号。 0

1 个答案: