swift tips - objc 带有 instancetype 的静态方法在 swift 中该如何写

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objc的类:

@interface A : NSObject
+ (instancetype)test;
@end

@implementation A
+ (instancetype)test {
return [[self alloc] init];
}
@end

在swift中这样写：

class A : NSObject {

class func test() -> Self {
return self.init()
}

required init() {
print("init")
}
}

用Self替代instancetype，并且在静态方法中要引用required的init构造方法。

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