swift - Xcode 7.3.1 Swift "initializer does not override a designated initializer from its superclass"错误

Question

import Foundation
import SpriteKit

class HGHero: SKSpriteNode {

var body: SKSpriteNode!
var arm: SKSpriteNode!
var leftFoot: SKSpriteNode!
var rightFoot: SKSpriteNode!

错误出现在这里:

override init () {

我不确定发生了什么事。我正在尝试覆盖 SKSpriteNode 的默认 init。

super.init(texture: nil, color: UIColor.blackColor(), size:    
CGSizeMake(32,44))
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

}

Answer 1

您只需删除 override 关键字即可。

class HGHero: SKSpriteNode {

    var body: SKSpriteNode!
    var arm: SKSpriteNode!
    var leftFoot: SKSpriteNode!
    var rightFoot: SKSpriteNode!

    init() {
        super.init(texture: nil, color: UIColor.blackColor(), size:
            CGSizeMake(32,44))
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }   
}

Infact initializers are not inherited (like instead happen with methods or properties). So you do not override them.

只是一个注释

这些隐式未包装的选项

var body: SKSpriteNode!
var arm: SKSpriteNode!
var leftFoot: SKSpriteNode!
var rightFoot: SKSpriteNode!

非常危险。