swift代码： if let keys = dic.allKeys as? [String], keys.contains("accumulatedReports") { let accumulatedReportsDic = dic.object(forKey: "accumulatedReports") as? NSDictionary let accumPerfectGoalAchievedDaysDic = accumulatedReportsDic?.object(forKey: "accumPerfectGoalAchievedDays") as? NSDictionary let value = accumPerfectGoalAchievedDaysDic?.object(forKey: "value") let latestDate = accumPerfectGoalAchievedDaysDic?.object(forKey: "latestDate") let latestPerfect = accumPerfectGoalAchievedDaysDic?.object(forKey: "latestPerfect") let dic = ["value": value, "latestDate": latestDate, "latestPerfect": latestPerfect] as? NSDictionary callback(dic as? [String : Any] ?? [:]) return } 如何用OC实现上述代码

可以使用 `NSDictionary` 和 `NSArray` 来实现上述 Swift 代码的功能，具体实现如下：

if ([dic.allKeys containsObject:@"accumulatedReports"]) {
    NSDictionary *accumulatedReportsDic = [dic objectForKey:@"accumulatedReports"];
    NSDictionary *accumPerfectGoalAchievedDaysDic = [accumulatedReportsDic objectForKey:@"accumPerfectGoalAchievedDays"];
    id value = [accumPerfectGoalAchievedDaysDic objectForKey:@"value"];
    id latestDate = [accumPerfectGoalAchievedDaysDic objectForKey:@"latestDate"];
    id latestPerfect = [accumPerfectGoalAchievedDaysDic objectForKey:@"latestPerfect"];
    NSDictionary *callbackDic = @{@"value": value ?: [NSNull null],
                                  @"latestDate": latestDate ?: [NSNull null],
                                  @"latestPerfect": latestPerfect ?: [NSNull null]};
    callback(callbackDic);
    return;
}

需要注意的是，由于 Objective-C 中没有类型推断功能，因此需要对上述代码中所有的 `id` 类型进行类型转换，以确保类型安全。此外，由于 Objective-C 中没有字典和数组的字面量语法，因此需要使用字典和数组的初始化方法来创建字典和数组。