case .getFile: DispatchQueue.global().async { [weak self] in guard let weakSelf = self else { return } guard let fileId = params.first, fileId.count > 0 else { return } let localFileDataStr = weakSelf.getFileFromLocal(fileId: fileId) if localFileDataStr.count > 0 { weakSelf.h5ProRuntimeCallback(payload, id, data: "'\(localFileDataStr)'") return } weakSelf.getFileFromHiCloud(fileId: fileId) {[weak self] fileDataString, errorCode in guard let weakSelf = self else { return } weakSelf.h5ProRuntimeCallback(payload, id, data: "'\(fileDataString)'", error: errorCode) } } 这段代码怎么优化

这段代码可以进行以下优化：

1. 使用guard let来避免嵌套的if语句，使代码更加清晰易读。

2. 对于闭包中的self，使用weak self来避免循环引用问题。

3. 将多余的字符串拼接操作删除，直接传递原始数据即可。

4. 对于DispatchQueue.global().async方法，可以使用DispatchQueue.global(qos: .userInitiated).async来指定优先级。

优化后的代码如下：

case .getFile:
    guard let fileId = params.first, !fileId.isEmpty else {
        return
    }
    DispatchQueue.global(qos: .userInitiated).async { [weak self] in
        guard let weakSelf = self else {
            return
        }
        let localFileDataStr = weakSelf.getFileFromLocal(fileId: fileId)
        if !localFileDataStr.isEmpty {
            weakSelf.h5ProRuntimeCallback(payload, id, data: localFileDataStr)
            return
        }
        weakSelf.getFileFromHiCloud(fileId: fileId) { [weak self] fileDataString, errorCode in
            guard let weakSelf = self else {
                return
            }
            weakSelf.h5ProRuntimeCallback(payload, id, data: fileDataString, error: errorCode)
        }
    }
}