［已解决］Swift中去判断字符串是否以某种格式开始

折腾：

［未解决］swift中字符串的正则表达式处理：判断字符串是否符合某个类型

但没解决问题。

所以换用：

判断字符串是否以某种格式开始

swift string start with

Common String Manipulations in Swift

How do you use String.substringWithRange? (or, how do Ranges work in Swift?) – Stack Overflow

How do I check if a string contains another string in Swift? – Stack Overflow

import UIKit

let userIdExample = "user-ae96618f-3a5c-48a8-a799-9944a4e76ed9"
let contactIdExample = "contact-1be1e474-388e-4b30-9030-40add6348cd4"
let groupIdExample = "group-7f1ad5cd-8f18-4c5e-9fe4-604c3e5b1ab8"
let teamIdExample = "team-d655d10c-a0dc-46f6-804d-c88866538036"
let topicIdExample = "topic-a11838ca-a741-4d2d-ad5c-477c87400ad0"

enum IdType{
    case Invalid
    case User
    case Contact
    case Group
    case Team
    case Topic
}

func checkIdType(id:String) -> IdType {
    var curIdType:IdType

    if id.hasPrefix("user-") {
        curIdType = IdType.User
    }else if id.hasPrefix("contact-") {
        curIdType = IdType.Contact
    }else if id.hasPrefix("group-") {
        curIdType = IdType.Group
    }else if id.hasPrefix("team-") {
        curIdType = IdType.Team
    }else if id.hasPrefix("topic-") {
        curIdType = IdType.Topic
    }else{
        curIdType = IdType.Invalid
    }

    return curIdType
}

checkIdType(userIdExample)
checkIdType(contactIdExample)
checkIdType(groupIdExample)
checkIdType(teamIdExample)
checkIdType(topicIdExample)

checkIdType("xxxx-xxx")

userIdExample.containsString("user-")
userIdExample.hasPrefix("user-")
userIdExample.startIndex

//userIdExample.substringWithRange(Range(start: 0, end: 3))

效果：

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［已解决］Swift中去判断字符串是否以某种格式开始

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