@IBDesignable - @IBOulet nil

Question

我不明白为什么在尝试实现@IBDesignable时，outlet是空的。这个应用程序总是崩溃。

import UIKit
import RxSwift
import RxCocoa

@IBDesignable
class SwitchOrderCell: UITableViewCell {

    @IBOutlet weak var orderSwitchLabel: UILabel!
    @IBOutlet weak var orderSwitch: OrderSwitch!
    var enabled: BehaviorRelay<Bool> = BehaviorRelay<Bool>(value: true)

    override func awakeFromNib() {
        super.awakeFromNib()
        orderSwitch.addTarget(self, action: #selector(update(_:)), for: .valueChanged)

    }

    func configure(with order: OrderBy) {
        self.orderSwitch.isOn = order == .new ? true : false
        orderSwitchLabel.text = self.orderSwitch.isOn ? "newest" : "oldest"


    }

    @objc func update(_ sender: UISwitch) {
        self.orderSwitch.isOn =  !self.orderSwitch.isOn
        orderSwitchLabel.text = self.orderSwitch.isOn ? "newest" : "oldest"
        enabled.accept(self.orderSwitch.isOn)
    }

    @IBInspectable var switchTintColor: UIColor = .gray {
        didSet {
            orderSwitch.backgroundColor = switchTintColor
        }
    }

    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()

    }


    func handleSwitch(enabled:(Bool)->()) {
        enabled(self.orderSwitch.isOn)
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
        // Configure the view for the selected state
    }

}

​

​

Answer 1

主要有两种可能性：

你没有把插座连接到你的故事板或xib上，，

• ，你不是从故事板或xib加载细胞。通过调用SwitchOrderCell().

来创建