小编zig*_*ggy的帖子

在此代码中,当文本发生更改时,titleEditingChanged会调用(如预期的那样).但是当它执行该行时

investment?.title = sender.text!

它调用didset{}的Investment.为什么？

class InvestmentCell: UITableViewCell {

    var investment: Investment? {
        didSet {
            // setup UI elements from class properties
            textField.text = investment?.title
            valueField.text = investment?.value?.description
        }
    }

    @IBAction func titleEditingChanged(sender: UITextField) {
        investment?.title = sender.text!
    }

    @IBOutlet weak var textField: UITextField!
    @IBOutlet weak var valueField: UITextField!
}