arrays - 自定义字符串排序: How do I place these strings in an array in this particular order

Question

/*你好，我是 swift 的新手，并且在自定义数组排序上遇到了困难。如何按特定顺序将这些字符串放入数组中？

相机:Prime:滤镜:支持:

如果我使用 NSString，我可以使用 .containsString我想要一个动态数组，因为我不知道列表最终会有多大

感谢您百忙之中看我的问题!*/

var equipmentList:[String]  = []

var item1   =   NSString(string: "Support: Fluid Head ")

var item2   =   NSString(string: "Prime: Ziess Master Primes")

var item3   =   NSString(string: "Filter: ND Set")

var item4   =   NSString(string: "Camera: Arri Alexa")



if item1.containsString("Camera:") {

    // place in first position in a dynamic array

}

if item1.containsString("Prime:") {

    // place in second position in a dynamic array

}

if item1.containsString("Filter:") {

    // place in third position in a dynamic array

}

if item1.containsString("Support:") {

    // place in forth position in a dynamic array

}

Answer 1

尝试一下。解释在评论中:

// The order by which you will sort your equipment types
let order = ["Camera", "Prime", "Filter", "Support"]


// The sorting function
func compareEquipment(equipment1: String, equipment2: String) -> Bool {
    let components1 = equipment1.componentsSeparatedByString(":")
    let components2 = equipment2.componentsSeparatedByString(":")

    // Each equipment string must have exactly 2 components separeted by
    // a colon (:), like in this format:
    //      equipment type: eqipment name
    //
    // If not, quit the function reporting an error
    guard components1.count == 2 && components2.count == 2 else {
        fatalError("Invalid equipment: '\(equipment1)' or '\(equipment2)'")
    }

    // The order of the equipment type
    let order1 = order.indexOf(components1.first!) ?? Int.max
    let order2 = order.indexOf(components2.first!) ?? Int.max

    // When comparing 2 equipment strings, order them by equipment type
    // first. If they are of the same type, order them by name
    if order1 != order2 {
        return order1 < order2
    } else {
        return components1.last! < components2.last
    }
}


let equipmentList = [
    "Support: Fluid Head",
    "Prime: Ziess Master Primes",
    "Filter: ND Set",
    "Camera: Arri Alexa"
]

let sortedEquipmentList = equipmentList.sort(compareEquipment)

print(sortedEquipmentList)