为什么我没有从 NSKeyedUnarchiver 获得一个数组？

Question

这是我的代码：

NSString * path = kCachePath(kCacheFileName);
NSMutableArray * arry = [[NSMutableArray alloc]init];
arry = [NSKeyedUnarchiver unarchiveObjectWithFile:path];

//    NSData * data  = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
//    NSError *error = nil;
//    arry = [NSJSONSerialization JSONObjectWithData: data options: NSJSONReadingMutableContainers error: &error];

if (arry) {
    [arry addObject:playModel];
    NSData * data = [NSKeyedArchiver archivedDataWithRootObject:arry];
    [NSKeyedArchiver archiveRootObject:data toFile:path];
    return YES;
} else {
    NSMutableArray * ary = [NSMutableArray array];
    [ary addObject:playModel];
    NSData * data = [NSKeyedArchiver archivedDataWithRootObject:ary];
    [NSKeyedArchiver archiveRootObject:data toFile:path];
}

我已经成功地将一个数组存档到文件中，但是当我想解开数据文件时，我得到了一个NSMutableData', But I want anNSMutableArray. and I have tried theNSJSONSerializationto conver theNSdatatoNSMutableArrayand I got anil`。有谁知道哪里出错了？

这是我的缓存路径：

#define kCacheFileName @"fakeLiveHistory.data"
#define kCachePath(kCacheFileName) ([NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0] stringByAppendingPathComponent:kCacheFileName])

Answer 1

你存档数据 - 不是一个数组，所以下次你取回数据时很明显;)

将数组存档作为开始

    NSData * data = [NSKeyedArchiver archivedDataWithRootObject:arry];

    [NSKeyedArchiver archiveRootObject:data toFile:path];

-->

    [NSKeyedArchiver archiveRootObject:arry toFile:path];