NSKeyedArchiver崩溃应用程序异常错误

时间:2015-09-12 02:28:07

标签: ios nskeyedarchiver nskeyedunarchiver

我正在尝试使用NSCoding和NSKeyedArchiver将图像保存到我的Documents文件夹中。该应用程序的工作方式如下:用户拍照,查看预览,保存图像,然后可以在图库部分查看图像。我不会同时保存多个图像。

我遇到了崩溃,如果我的照片类设置不当,或者我的解密代码错误,我不知道我是否正确归档图像。最终,我需要抓取对象并使用它们来填充集合视图。

当我调用代码来加载对象时,我得到一个看起来像这样的崩溃

  

由于未捕获的异常'NSInvalidArgumentException'而终止应用程序,原因:' - [ImageForArchiving countByEnumeratingWithState:objects:count:]:无法识别的选择器发送到实例0x174232da0'   ***第一次抛出调用堆栈:   (0x18533c22c 0x196fb00e4 0x1853432f4 0x1853400a8 0x18524296c 0x10001aefc 0x189ded1ec 0x189dd62c8 0x189decb88 0x189dec814 0x189de5d50 0x189db8f74 0x18a05a124 0x189db7488 0x1852f3f8c 0x1852f3230 0x1852f12e0 0x18521cf74 0x18ec7f6fc 0x189e1ed94 0x10001840c 0x19765aa08)   libc ++ abi.dylib:以NSException类型的未捕获异常终止

我的子类代码如下所示。 ImageForArchiving符合NSCoder协议。

ImageForArchiving.h

    @interface ImageForArchiving : NSObject <NSCoding>

@property (strong) NSDate *date;
@property (strong) NSData *imageData;

+ (ImageForArchiving *)createImageWithImage:(NSData*)data andDate:(NSDate*)date;
-(void)encodeWithCoder:(NSCoder *)aCoder;
-(id)initWithCoder:(NSCoder *)aDecoder;

@end

ImageForArchiving.m

@implementation ImageForArchiving

+ (ImageForArchiving *)createImageWithImage:(NSData*)data andDate:(NSDate*)date {

    ImageForArchiving *archiveImage = [[ImageForArchiving alloc] init];

    [archiveImage setDate:date];
    [archiveImage setImageData:data];

    return archiveImage;
}

- (id) initWithCoder: (NSCoder *)coder
{
    if (self = [super init])
    {
        [self setDate: [coder decodeObjectForKey:@"date"]];
        [self setImageData: [coder decodeObjectForKey:@"image"]];

    }
    return self;
}

- (void) encodeWithCoder: (NSCoder *)coder
{

    [coder encodeObject:self.date forKey:@"date"];
    [coder encodeObject:self.imageData forKey:@"image"];

}

@end

存档代码位于预览VC中,用户在拍摄后可以查看照片。它看起来像一个带有块的segue弹出的模态。

PreviewViewController.m (保存图像IBAction)

NSString *filePath = [self createPathForDataFile];
    NSData *pngData = UIImagePNGRepresentation(self.previewImage.image);
    NSDate *date = [NSDate date];

    ImageForArchiving *imageRecord = [ImageForArchiving createImageWithImage:pngData andDate:date];
    [self saveItemsAtFilePath:filePath andImageToArchive:imageRecord];

创建文件路径

- (NSString *)createPathForDataFile
{
    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsPath = [paths objectAtIndex:0];


    documentsPath = [documentsPath stringByExpandingTildeInPath];
    NSError *error = nil;
    if ([fileManager fileExistsAtPath: documentsPath] == NO)
    {
        [fileManager createDirectoryAtPath:documentsPath withIntermediateDirectories:YES attributes:nil error:&error];
    }

    return [documentsPath stringByAppendingPathComponent:@"images"];
}

保存图像

- (void)saveItemsAtFilePath:(NSString*)filePath andImageToArchive:(ImageForArchiving*)imageRecord {

        [NSKeyedArchiver archiveRootObject:imageRecord toFile:filePath];
    }

加载图像 - 这是发生崩溃的地方

- (void)loadItems {
    NSString *filePath = [self createPathForDataFile];

    if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
        self.galleryItemsArray = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
    } else {
        self.galleryItemsArray = [NSMutableArray array];
    }
}

0 个答案:

没有答案