NSInvalidArgumentException, reason: 'Invalid type in JSON write (__NSDate)'

Question

I\'m getting this exception when I try to JSON encode NSDate object.I believe NSDate is not compatible for JSON encoding. but I must encode the date.Any solutions?

Answer 1

For our case, we are using Mantle to convert an object to JSON and one of our objects with property NSDate is missing its JSONTransformer

@property (nonatomic) NSDate *expiryDate;

where:

+ (NSValueTransformer *)expiryDateJSONTransformer {
     return [MTLValueTransformer transformerUsingForwardBlock:^id(NSString *dateString, BOOL *success, NSError *__autoreleasing *error) {
        return [self.dateFormatter dateFromString:dateString];
    } reverseBlock:^id(NSDate *date, BOOL *success, NSError *__autoreleasing *error) {
        return [self.dateFormatter stringFromDate:date];
    }];
}

+ (NSDateFormatter *)dateFormatter {
    NSDateFormatter *df = [NSDateFormatter new];
    df.dateFormat = @"yyyy-MM-dd";
    return df;
}

Answer 2

I am doing something like this in my body params encoder

// handle dates
              var _params = [String: Any]()
              params.forEach { (key, value) in
                if let date = value as? Date {
                    _params[key] = DateFormatter.iso8601Full.string(from: date)
                } else {
                    _params[key] = value
                }
              }

              return try? JSONSerialization.data(withJSONObject: _params)