Ios Swift用户模型Flash Bug

我注意到我的应用程序中有一个bug，它会导致配置文件屏幕“闪烁”。我发现这与这一行有关（在我的viewmodel中），通过注释所有其他行直到我发现bug哈哈：

self.user.stats = UserStats(posts: posts, followers: followers, following: following)

整个功能：

 func fetchUserStats() {
        
        guard let uid = user.id else { return }
        
        COLLECTION_FOLLOWING.document(uid).collection("user-following").getDocuments { snapshot, _ in
            
            guard let following = snapshot?.documents.count else { return }
            
            COLLECTION_FOLLOWERS.document(uid).collection("user-followers").getDocuments { snapshot, _ in
                
                guard let followers = snapshot?.documents.count else { return }
                
                COLLECTION_POSTS.whereField("ownerUid", isEqualTo: uid).getDocuments { snapshot, _ in
                    
                    guard let posts = snapshot?.documents.count else { return }
                    //print(posts)
                    
                    self.user.stats = UserStats(posts: posts, followers: followers, following: following)
                    
                }
                
            }
        }
        
    }

然后，这些信息（在我看来）被呈现出来：

错误在于它导致概要文件屏幕闪烁一次，这是因为它首先将stats视图设置为默认值0，然后设置为实际值。 当我删除“viewModel.user.stats？.posts±0”并将其替换为静态int（如20）时，闪烁消失。 你知道为什么它会导致整个屏幕闪烁吗？是否有任何解决办法使屏幕不闪烁

对于上下文，我在用户模型中将用户统计信息声明为可选值：

    struct User: Identifiable, Decodable {
    
    let username: String
    let email: String
    var profileImageUrl: String
    let fullname: String
    @DocumentID var id: String?
    var bio: String?
    var stats: UserStats?
    var isFollowed: Bool? = false
    var verified: Bool?
    var isCurrentUser: Bool { return AuthViewModel.shared.userSession?.uid == id }
    
    
}

struct UserStats: Decodable {
    
    var posts: Int
    var followers: Int
    var following: Int
    
}

谢谢

雅各布

    struct User: Identifiable, Decodable {
    
    let username: String
    let email: String
    var profileImageUrl: String
    let fullname: String
    @DocumentID var id: String?
    var bio: String?
    var stats: UserStats?
    var isFollowed: Bool? = false
    var verified: Bool?
    var isCurrentUser: Bool { return AuthViewModel.shared.userSession?.uid == id }
    
    
}

struct UserStats: Decodable {
    
    var posts: Int
    var followers: Int
    var following: Int
    
}