无法在同一文件中保存多个图像

Question

我似乎无法将多个图像保存到同一个文件中。我继续使用新的样本照片（例如，IMG_3997）运行它，但是图像文件保留了我使用的第一个图像的副本...尽管文件不断变大。 seekToEndOfFile似乎没有工作，或者我只是无法在文件中看到新图像。我有一组类似的代码用于将文本写入一个完美的文件。困惑！有任何线索或建议吗？

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Since iPhone simulator doesn't have photos, load and display a placeholder image
    NSString *fPath = [[NSBundle mainBundle] pathForResource:@"IMG_3997" ofType:@"jpg"];
    url = [NSURL fileURLWithPath:fPath];
    [webView loadRequest:[NSURLRequest requestWithURL:url]];

    // Write image to file
    UIImage *image = [UIImage imageWithContentsOfFile:fPath];        
    NSArray *DocumentsDirectoryPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [DocumentsDirectoryPath objectAtIndex:0];
    NSString *filePath = [path stringByAppendingPathComponent:@"image"];

    // set up filemanager
    NSFileManager *fileManager = [NSFileManager defaultManager];
    //Creating or writing in a file at filePath
    if ([fileManager fileExistsAtPath:filePath] == NO) {
        [fileManager createFileAtPath:filePath contents:nil attributes:nil];}

    //Writing image to the created file
    NSFileHandle *myHandle = [NSFileHandle fileHandleForWritingAtPath:filePath];
    // move to the end of the file to add data
    [myHandle seekToEndOfFile];
    [myHandle writeData:  [NSData dataWithData:UIImageJPEGRepresentation(image, 1.0f)]];
    [myHandle closeFile];
}