https://stackoverflow.com/a/58675296/1271826

Synchron.m

@interface Synchron: NSObject

@property (copy, nonatomic) NSString *name;
@property (copy, nonatomic) NSString *identifier;

- (id)initWithName:(NSString *)name identifier:(NSString *)identifier;
+ (instancetype)synchronWithName:(NSString *)name identifier:(NSString *)identifier;

@end

@implementation Synchron

- (id)initWithName:(NSString *)name identifier:(NSString *)identifier {
    self = [super init];
    if (self) {
        self.name = name;
        self.identifier = identifier;
    }
    return self;
}

+ (instancetype)synchronWithName:(NSString *)name identifier:(NSString *)identifier {
    return [[self alloc] initWithName:name identifier:identifier];
}

@end