ios - 为什么WXInvocationConfig这个抽象类会使用单例模式？

Question

为什么WXInvocationConfig这个抽象类会使用单例模式？

+ (instancetype)sharedInstance
{
    static id _sharedInstance;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _sharedInstance = [[self alloc] init];
    });
    
    return _sharedInstance;
}

Answer 1

A singleton was used in this place before, but now it is not used. I will consider getting rid of it. Thanks for the tip