swift - 错误 : Cannot assign to '...' in 'self'

Question

我有这个代码

import UIKit

class SliderControllerView: UIView{
    private let type: ControlType!
    private let label: UILabel!
    private let slider: UISlider!
    private weak var delegate: SliderControllerDelegate?

    private let defaults: SliderDefaults!

    convenience init(type: ControlType, defaults: SliderDefaults, delegate: SliderControllerDelegate?) {

        self.init()

        self.type = type
        self.delegate = delegate
        self.defaults = defaults

        setTranslatesAutoresizingMaskIntoConstraints(false)

        label = UILabel()
        configureLabel()

        slider = UISlider()
        configureSlider(slider)

        SliderDefaults.set(slider, defaults: defaults)

        if let valueFromDetauls = userDefaultsValue {
            slider.value = Float(valueFromDetauls)
        }

        saveValueInUserDefaults()
        updateLabel()
    }

错误信息:

1. 无法分配给“self”中的“type”
2. 无法分配给“self”中的“defaults”
3. 无法分配给“self”中的“label”
4. 无法分配给“self”中的“slider”

我做什么？ 谢谢!

Answer 1

我对代码做了一些修改，因此它可以编译，尽管它确实改变了一些含义。

class SliderControllerView: UIView {

    // Converted "let" to "var"
    private var type: ControlType!
    private var label: UILabel!
    private var slider: UISlider!
    private weak var delegate: SliderControllerDelegate?

    private var defaults: SliderDefaults!

    // Added frame to init
    convenience init(frame: CGRect, type: ControlType, defaults: SliderDefaults, delegate: SliderControllerDelegate?) {

        // Call designated init(frame: CGRect) for UIView
        self.init(frame: frame)
        self.type = type
        self.delegate = delegate
        self.defaults = defaults

        setTranslatesAutoresizingMaskIntoConstraints(false)

        label = UILabel()
        configureLabel()

        slider = UISlider()
        configureSlider(slider)

        SliderDefaults.set(slider, defaults: defaults)

        if let valueFromDetauls = userDefaultsValue {
            slider.value = Float(valueFromDetauls)
        }

        saveValueInUserDefaults()
        updateLabel()
}