swift4.0 cell重用導(dǎo)致ReactiveCocoa(RAC) cell上Button點擊事件多次觸發(fā)問題

問題描述

在UITableview等涉及cell的重用的界面中，cell上的按鈕點擊事件RAC響應(yīng)會隨著cell的重用多次觸發(fā)，并導(dǎo)致cell無法釋放
cell上添加按鈕

lazy var voiceBtn: UIButton = {
        let button = UIButton()
        button.setImage(UIImage.init(named: "chat_speek3_voiceR"), for: UIControlState.normal)
        button.setImage(UIImage.init(named: "chat_speek3_voiceR"), for: UIControlState.highlighted)
        requestIM.addSubview(button)
        return button
    }()

在cell對象中觸發(fā)按鈕的RAC點擊事件

guard let cell = tableView.dequeueReusableCell(withIdentifier: "UTBVChatCell", for: indexPath) as? UTBVChatCell else {
                return UITableViewCell()
            }
            
            cell.voiceBtn.reactive.controlEvents(.touchUpInside).observeValues { (sender) in
                print("========voice button")
            }
            return cell

在不滾動界面的情況下點價按鈕只響應(yīng)了一次

========voice button

滾動界面后點擊按鈕，直接打印了四個log

========voice button
========voice button
========voice button
========voice button

解決辦法

這個問題是由于cell重用導(dǎo)致的，需要解除signal在重用時的綁定。

cell.voiceBtn.reactive.controlEvents(.touchUpInside).take(until: cell.reactive.prepareForReuse) .observeValues { (sender) in
                print("========voice button")
            }
        

采用take(until: cell.reactive.prepareForReuse)解除cell重用時signal的綁定 

滾動界面觸發(fā)按鈕事件查看log

========voice button

嘿嘿，只有一次啦，成功解決