[英]Swift Eureka Forms - How to assign values to field options?
如果我這樣創建分段的行字段:
<<< SegmentedRow<String>(){ row in
row.title = "Sex"
row.tag = "sex"
row.selectorTitle = "Select your sex"
row.options = ["Male","Female"]
}
如何將選項與特定值匹配? 例如,如果用戶選擇“男性”,那么有沒有辦法在代碼中獲得M
而不是“ Male
,但是仍然向用戶顯示“ Male
”?
或者,例如,如果我有一個國家/地區列表:
<<< PushRow<String>(){ row in
row.title = "Passport Issuing Country"
row.tag = "passportIssuingCountry"
row.selectorTitle = "Passport Issuing Country"
row.options = ["AUSTRALIA","AUSTRIA","BELGIUM"]
}
我可以將每個國家/地區名稱分配給國家/地區代碼,例如AUSTRALIA
返回AU
, AUSTRIA
返回AT
,等等。
目前,無法保留期權的內部價值-但這是您可以做的:
1.使用所有可用選項創建一個枚舉
enum Sex: Int {
case NotKnown = 0
case Male = 1
case Female = 2
case NotApplicable = 9
static let all = [NotKnown, Male, Female, NotApplicable]
static let strings = ["Unknown", "Male", "Female", "Not Applicable"]
func string() -> String {
let index = Sex.all.index(of: self) ?? 0
return Sex.strings[index]
}
static func fromString(string: String) -> Sex {
if let index = Sex.strings.index(of: string) {
return Sex.all[index]
}
return Sex.NotKnown
}
}
2.使用要顯示的所有選項創建行
<<< SegmentedRow<String>(){ row in
row.title = "Sex"
row.tag = "sex"
row.selectorTitle = "Select your sex"
row.options = [Sex.Female.string(), Sex.Male.string()]
}
3.讀取值
let row: SegmentedRow<String>? = self.form.rowBy(tag: "sex")
if let value = row?.value {
// Returns "Female"
print(value)
// Returns 2
print(Sex.fromString(string: value).rawValue)
}
用戶可以看到並選擇Strings
,但是會得到一個enum
值,例如可以將它作為整數保存在數據庫中(請參閱:ISO / IEC 5218)。
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