编码 NSMutableArray

Question

编辑：好的，我决定将数组保存在 userDefaults... 应该很容易，对吧？ 保存：

NSUserDefaults *userDefs = [NSUserDefaults standardUserDefaults];
    [userDefs setObject:videoArray forKey:@"dataArray"];
    [userDefs synchronize];

加载：

 NSUserDefaults *userDefs = [NSUserDefaults standardUserDefaults];
    videoArray = [[NSUserDefaults standardUserDefaults] mutableArrayValueForKey:@"dataArray"];

    [tableview reloadData];
    NSLog(@"%@",videoArray);

数组中对象的类别：

@interface DEVideoModel : NSObject

@property (copy) NSString *name;
@property (copy) NSImage *thumbnail;
@property (copy) NSDictionary *qualities;
@property (readwrite) float videoSize;
@property (readwrite) float progress;
@property (copy) NSString *filePath;
@property (copy) NSDate *datum;


@end

@synthesize name,filePath,videoSize,qualities,thumbnail,datum,progress;
-(id)init {
    self = [super init];
    if(self) {
        qualities = [[NSDictionary alloc]init];
        thumbnail = [[NSImage alloc]init];
    }
    return self;
}


@end

当我加载它时，我的 videoArray 是（null）？！我不明白。顺便说一下，videoArray 是一个 NSMutableArray 而不是 NSArray。

Answer 1

在您的代码中，您将 NSData 写入 NSCoder，因此您需要读取 NSData 然后将其转换为数组。

NSURL *appSupportDir = [[NSFileManager defaultManager] URLForDirectory:NSApplicationSupportDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:YES error:&error];
NSString *path = [NSString stringWithFormat:@"%@/DEConvert.dat",[appSupportDir path]];
NSLog(@"%@",appSupportDir);
NSData *data = [NSData dataWithContentsOfFile:path];
NSMutableArray *arr = [NSKeyedUnarchiver unarchiveObjectWithData:data];

在 NSUserDefault 中存储对象

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:arr];
[[NSUserDefaults standardUserDefaults] setObject:data forKey:@"your key"];

取消归档同样简单：

NSData *NewData = [[NSUserDefaults standardUserDefaults] objectForKey:@"your key"];
NSArray *arr = [NSKeyedUnarchiver unarchiveObjectWithData:NewData];