為什么不從NSKeyedUnarchiver獲取數組？

Question

這是我的代碼：

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];
}

我已經成功地將數組歸檔到文件中，但是當我想解包數據文件時，得到了NSMutableData', But I want an NSMutableArray . and I have tried the . and I have tried the NSJSONSerialization to conver the NSdata轉換to NSMutableArray and I got a為零。 有人知道哪里出問題了嗎？

這是我的cachePath：

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

Answer 1

您正在歸檔數據-不是數組，因此下次您很顯然會返回數據;）

存檔數組作為開始

    NSData * data = [NSKeyedArchiver archivedDataWithRootObject:arry];

    [NSKeyedArchiver archiveRootObject:data toFile:path];

- >

    [NSKeyedArchiver archiveRootObject:arry toFile:path];