我在遵循Swift:https://www.raywenderlich.com/125311/make-game-like-candy-crush-spritekit-swift-part-1的教程,偶然发现了这段代码:
func == (lhs: Cookie, rhs: Cookie) -> Bool {
return lhs.column == rhs.column && lhs.row == rhs.row
}
我就是这么写的,但是Xcode给了我这些错误:
Consecutive declarations on a line must be separated by ';'
Expected declaration operators are only allowed at global scope
我在苹果的文档中找到了下面的代码:https://developer.apple.com/documentation/swift/equatable
这和我写的很相似。怎么了?对我来说,这似乎是个bug。我使用的是Xcode 6 Beta 2
编辑:
这是我的整个Cookie类:
class Cookie: Printable, Hashable {
var column: Int
var row: Int
let cookieType: CookieType
let sprite: SKSpriteNode?
init(column: Int, row: Int, cookieType: CookieType) {
self.column = column
self.row = row
self.cookieType = cookieType
}
var description: String {
return "type:\(cookieType) square:(\(column),\(row))"
}
var hashValue: Int {
return row * 10 + column
}
func ==(lhs: Cookie, rhs: Cookie) -> Bool {
return lhs.column == rhs.column && lhs.row == rhs.row
}
}
发布于 2014-06-28 22:58:51
移动此函数
func == (lhs: Cookie, rhs: Cookie) -> Bool {
return lhs.column == rhs.column && lhs.row == rhs.row
}
在cookie类之外。这样做是有意义的,因为当在两个Cookie上使用时,它覆盖了全局范围内的==操作符。
发布于 2015-09-06 20:58:12
让类成为NSObject为我解决了等价性问题……
class Cookie: NSObject {
...
}
(从iOS apprentice教程获得提示)
https://stackoverflow.com/questions/24467960
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