IOS RestKit Parsing Date

Question

In an old iOS project, I had to parse the dates that go into the format dd/MM/yyyy, so I put these lines in the static method of my AppDelegate and worked as expected

// Set the Dateformatter for the Dates returned by Knowledge tt/mm/yyyy
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd/MM/yyyy"];
[[RKValueTransformer defaultValueTransformer] insertValueTransformer:dateFormatter atIndex:0];

However, in real projects, my dates have a slightly different format dd.MM.yyyy, so I used the same lines of code, just changed the date format, but the date is not parsed.

For this date, "ExamDate":"20.06.2014"after parsing, I get (NSDate *) _examDate = 0x08f7dcd0 2014-01-01 01:00:00 CET, and I do not understand why.

Update: I did a little test with this code:

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd.MM.yyyy"];
NSDate *date = [dateFormatter dateFromString:@"20.06.2014"];
DLog(@"Date: %@", date);

and hit the log: Date: 2014-06-19 22:00:00 +0000

Answer 1

GMT -2: 00. 0 GMT, . unix , .

dateFormatter.timeZone = [NSTimeZone timeZoneForSecondsFromGMT:0];

RestKit, . , , RestKit , .

, :

[RKObjectMapping alloc]; // This ensures you will actually insert at index 0!

[RKValueTransformer.defaultValueTransformer
 insertValueTransformer:
 [RKBlockValueTransformer
  valueTransformerWithValidationBlock:^BOOL(__unsafe_unretained Class inputValueClass, __unsafe_unretained Class outputValueClass) {
      return (([inputValueClass isSubclassOfClass:[NSDate class]] && [outputValueClass isSubclassOfClass:[NSString class]]) ||
              ([inputValueClass isSubclassOfClass:[NSString class]] && [outputValueClass isSubclassOfClass:[NSDate class]]));
  }
  transformationBlock:^BOOL(id inputValue, __autoreleasing id *outputValue, __unsafe_unretained Class outputClass, NSError *__autoreleasing *error) {
      RKValueTransformerTestInputValueIsKindOfClass(inputValue, (@[ [NSString class], [NSDate class] ]), error);
      RKValueTransformerTestOutputValueClassIsSubclassOfClass(outputClass, (@[ [NSString class], [NSDate class] ]), error);
      if ([inputValue isKindOfClass:[NSString class]]) {
          // We're mapping from a string to a date.
          // You can add your formatter here.
          // Below is mine for mapping from Unix Time to an NSDate.
          NSString* input = inputValue;
          *outputValue = [NSDate dateWithTimeIntervalSince1970:input.integerValue];
      } else if ([inputValue isKindOfClass:[NSDate class]]) {
          // We're mapping from a date to a string.
          // You can add your formatter here (if needed).
          // Below is mine for mapping from an NSDate to Unix Time.
          NSDate* input = inputValue;
          *outputValue = @([input timeIntervalSince1970]);
      }
      return YES;
  }]
 atIndex:0]; // Insert at index 0 so your formatter is always used over the default one.

, , RestKit NSDateFormatter, RKValueTransformer. - :

[RKObjectMapping alloc]; // This ensures you will actually insert at index 0!
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd.MM.yyyy"];
dateFormatter.timeZone = [NSTimeZone timeZoneWithAbbreviation:@"UTC"];
[RKDefaultValueTransformer insertValueTransformer:dateFormatter atIndex:0];