如何将Swift枚举转换成一个Objective-C枚举：NSString？ [英] How to convert a Swift enum: String into an Objective-C enum: NSString?

问题描述

 公开枚举ISO8601格式：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 = ISO8601格式（rawValue：ISO8601Format.Year.rawValue）！ 
案例7：
 self = ISO8601格式（rawValue：ISO8601Format.YearMonth.rawValue）！ 
案例10：
 self = ISO8601格式（rawValue：ISO8601Format.Date.rawValue）！ 
案例22：
 self = ISO8601格式（rawValue：ISO8601Format.DateTime.rawValue）！ 
案例25：
 self = ISO8601格式（rawValue：ISO8601Format.DateTimeSec.rawValue）！ 
 default：// 28：
 self = ISO8601格式（rawValue：ISO8601Format.DateTimeMilliSec.rawValue）！ 
} 
} 
} 
 
 public enum DateFormat {
 case ISO8601（ISO8601Format？），DotNet，RSS，AltRSS，Custom（String）
 
  

我已经研究过这个，发现这个和这个：

枚举NSString的最佳方式

枚举到NSString（iOS）的值

不太了解这些答案。我正在寻找更加优雅的解决方案（如果有）或更好的解释这些答案与现代客观c语法。 p>

谢谢！

解决方案

  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'THH：mmZ; // 1997-07-16T19：20 + 01：00 
 NSString * const ISOFormatDateTimeSec = @yyyy-MM-dd'THH：mm：ssZ; // 1997-07-16T19：20：30 + 01：00 
 NSString * const ISOFormatDateTimeMilliSec = @yyyy-MM-dd'THH：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详细信息:( NSString *）详细信息{
 
 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 
  

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 !

解决方案

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

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