如何解决在Swift中,如何将字符串作为类的属性名称放在函数的参数中?
我需要通过在函数的参数中放入属性名称来分解somme计算,例如func TotalCalorie(Liste list: [[Movie]],Macro: Int) -> Int
,例如year
,在这种情况下:
struct Movie {
var title = ""
var year = 0
var BoxOffice = 0
var isImportant: Bool
var isFinished: Bool
init(title: String,year: Int,BoxOffice: Int,isImportant: Bool,isFinished: Bool) {
self.title = title
self.year = year
self.BoxOffice = BoxOffice
self.isImportant = isImportant
self.isFinished = isFinished
}
static let list1 = [
Movie(title: "The Shawshank Redemption",year: 1,BoxOffice: 2,isImportant: false,isFinished: false),Movie(title: "The Godfather",BoxOffice: 4,Movie(title: "The Dark Knight",BoxOffice: 1,isFinished: false)
]
static let list2 = [
Movie(title: "The Lord of the Rings: The Fellowship of the Ring",year: 2,BoxOffice: 3,Movie(title: "Inception",isFinished: false)
]
static let list2Bis = [
Movie(title: "The Lord of the Rings: The Fellowship of the Ring",BoxOffice: 6,isFinished: false)
]
static let list3 = [list1,list2,list2Bis]
static let nomsDesRepas: [String] = ["Petit Déjeuner","Collation 11h"]
}
func TotalCalorie(Liste list: [[Movie]],Macro: Int) -> Int { // It's here
var totalsection = 0
var totalcalorie = 0
for xxx in 0..<list.count {
totalsection = 0
for yyy in 0..<list[xxx].count {
totalsection += list[xxx][yyy].year
}
totalcalorie += totalsection
}
return totalcalorie
}
let calories = TotalCalorie(Liste: Movie.list3,Macro: .year)
print(calories)
我必须将year或BoxOffice放在我的职能参数中。 我该怎么办?
解决方法
您可以在此处尝试使用 Mirror
。
在方法中使用String
类型的参数,并使用它通过value
获取属性的Mirror
。
func totalCalorie(liste list: [[Movie]],macro: String) -> Int {
var totalsection = 0
var totalcalorie = 0
list.forEach {
totalsection = 0
$0.forEach({ (movie) in
if let value = Mirror(reflecting: movie).children.first(where: { $0.label == macro })?.value as? Int {
totalsection += value
}
})
totalcalorie += totalsection
}
return totalcalorie
}
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