Question

一件式管理器课程

import Foundation

import UIKit

import GameKit

struct OnePieceManager {

    let fact: String
    let color: UIColor
    let music: String

}

struct OnePiece {
    private let onePieceFacts = [OnePieceManager(fact: "Oda was born in Kumamoto, Japan on January 1, 1975.", color: UIColor(red:1.00, green:0.42, blue:0.00, alpha:1.00), music: "song"),

                                 OnePieceManager(fact: "One Piece is currently the best selling manga in the world, it sold well over 380 million copies and it is not stopping there.", color:  UIColor(red:0.98, green:0.70, blue:0.00, alpha:1.00), music: "song"),

                                 OnePieceManager(fact:   "Even though Luffy is the main character of One Piece, Nami appears on screen before Luffy in the anime making her the first main character to be seen.", color: UIColor(red:0.28, green:0.21, blue:0.42, alpha:1.00), music: "song"),

                                 OnePieceManager(fact: "The only way Luffy will part from his crew is either if he becomes the Pirate King or if he dies.", color: UIColor(red:1.00, green:0.63, blue:0.00, alpha:1.00), music: "song")]

    func randomFact() -> OnePieceManager {

        let randomNumber = GKRandomSource.sharedRandom().nextInt(upperBound: onePieceFacts.count)
        return onePieceFacts[randomNumber]
    }
}

事实视图控制器

import Foundation

import UIKit

import AVFoundation

class FactsViewController: UIViewController  {

    @IBOutlet weak var onePieceFactlbl: UILabel!
    @IBOutlet weak var onePieceFactBtn: UIButton!

    let onePieceManager = OnePieceManager()

    override func viewDidLoad() {
        super.viewDidLoad()

    }


    @IBAction func onePieceFactBtnDidTouch(_ sender: Any) {


    }
}

Answer 1

问题出在这一行

let onePieceManager = OnePieceManager()

所以init这样

let onePieceManager = OnePieceManager(fact: "Oda", color: UIColor(red:1.00, green:0.42, blue:0.00, alpha:1.00), music: "song")

OR

var onePieceManager:OnePieceManager?

Answer 2

不同于具有非可选成员的class和struct，它提供了一个合成的（称为 memberwise ）初始化器

init(fact: String, color: UIColor, music: String)

已指定。这意味着您必须使用它，无法使用默认的初始化程序()。

在onePieceManager中将变量FactsViewController声明为可选变量–或在将其用作隐式未包装可选变量之前是否已设置值：

var onePieceManager : OnePieceManager? // or OnePieceManager!

呼叫中缺少参数'fact'的参数

2 个答案: