How to convert a Swift enum: String into an Object

问题:

I am having an issue converting this swift enum to Objective-C :

 public enum ISO8601Format: String {

case Year = "yyyy" // 1997
case YearMonth = "yyyy-MM" // 1997-07
case Date = "yyyy-MM-dd" // 1997-07-16
case DateTime = "yyyy-MM-dd'T'HH:mmZ" // 1997-07-16T19:20+01:00
case DateTimeSec = "yyyy-MM-dd'T'HH:mm:ssZ" // 1997-07-16T19:20:30+01:00
case DateTimeMilliSec = "yyyy-MM-dd'T'HH:mm:ss.SSSZ" // 1997-07-16T19:20:30.45+01:00

    init(dateString:String) {
        switch dateString.characters.count {
        case 4:
            self = ISO8601Format(rawValue: ISO8601Format.Year.rawValue)!
        case 7:
            self = ISO8601Format(rawValue: ISO8601Format.YearMonth.rawValue)!
        case 10:
            self = ISO8601Format(rawValue: ISO8601Format.Date.rawValue)!
        case 22:
            self = ISO8601Format(rawValue: ISO8601Format.DateTime.rawValue)!
        case 25:
            self = ISO8601Format(rawValue: ISO8601Format.DateTimeSec.rawValue)!
        default:// 28:
            self = ISO8601Format(rawValue: ISO8601Format.DateTimeMilliSec.rawValue)!
        }
    }
}

public enum DateFormat {
case ISO8601(ISO8601Format?), DotNet, RSS, AltRSS, Custom(String)
}

I already researched this everywhere and found this and this:

Best way to enum NSString

enum Values to NSString (iOS)

Didn't quite understand those answers.I am looking for more elegant solutions (if there are any) or better explanations of those answers with modern objective-c syntax.

Thank you !

回答1:

NSString * const ISO8601DateFormatType = @"ISO8601";
NSString * const DotNetDateFormatType = @"DotNet";
NSString * const RSSDateFormatType = @"RSS";
NSString * const AltRSSDateFormatType = @"AltRSS";
NSString * const CustomDateFormatType = @"Custom";

NSString * const ISOFormatYear = @"yyyy";
NSString * const ISOFormatYearMonth = @"yyyy-MM"; // 1997-07
NSString * const ISOFormatDate = @"yyyy-MM-dd"; // 1997-07-16
NSString * const ISOFormatDateTime = @"yyyy-MM-dd'T'HH:mmZ"; // 1997-07-16T19:20+01:00
NSString * const ISOFormatDateTimeSec = @"yyyy-MM-dd'T'HH:mm:ssZ"; // 1997-07-16T19:20:30+01:00
NSString * const ISOFormatDateTimeMilliSec = @"yyyy-MM-dd'T'HH:mm:ss.SSSZ"; // 1997-07-16T19:20:30.45+01:00

@interface DateFormat : NSObject 

    + (instancetype) ISODateFormat: (NSString *) isoFormat;
    + (instancetype) DotNetDateFormat;
    + (instancetype) RSSDateFormat;
    + (instancetype) AltRSSDateFormat;
    + (instancetype) CustomDateFormat: (NSString *) formatString;

    @property (readonly) NSString *dateFormatType;
    @property (readonly) NSString *formatDetails;

@end

@implementation DateFormat

- (instancetype) initWithType: (NSString *) formatType details: (NSString *) details {

    if(self = [super init]) {
        _dateFormatType = formatType;
        _formatDetails = details;
    }

    return self;
}

+ (instancetype) ISODateFormat: (NSString *) isoFormat
{
    return [[DateFormat alloc] initWithType: ISO8601DateFormatType details: isoFormat];
}

+ (instancetype) DotNetDateFormat
{
    return [[DateFormat alloc] initWithType: DotNetDateFormatType details: nil];
}

+ (instancetype) RSSDateFormat
{
    return [[DateFormat alloc] initWithType: RSSDateFormatType details: nil];
}

+ (instancetype) AltRSSDateFormat
{
    return [[DateFormat alloc] initWithType: AltRSSDateFormatType details: nil];
}

+ (instancetype) CustomDateFormat: (NSString *) formatString
{
    return [[DateFormat alloc] initWithType: CustomDateFormatType details: formatString];
}

@end