Objective c 目标-C->；迅捷的

请帮助我，我是swift新手，无法将代码从obj-c“翻译”到swift。请给我一些资料或任何帮助。或与swift中INSTANCETYPE的任何类似项

@implementation Message

+ (instancetype)messageWithString:(NSString *)message
{
    return [Message messageWithString:message image:nil];
}

+ (instancetype)messageWithString:(NSString *)message image:(UIImage *)image
{
    return [[Message alloc] initWithString:message image:image];
}

- (instancetype)initWithString:(NSString *)message
{
    return [self initWithString:message image:nil];
}

- (instancetype)initWithString:(NSString *)message image:(UIImage *)image
{
    self = [super init];
    if(self)
    {
        _message = message;
        _avatar = image;
    }
    return self;

 }
@end

---

Swift的惯例是不翻译工厂方法（看看Apple如何翻译

NSString

）

试试这个：

class Message: NameOfSuperClass {
    var message: String
    var image: UIImage?

    init(message: String, image: UIImage? = nil) {
        self.message = message
        self.image = image
        super.init()
    }
}

用法：

let a = Message(message: "Hello world")
let b = Message(message: "Goodbye world", image: anImage) // Assume anImage is defined