在应用程序文档目录中删除图像

Question

我在应用程序文档目录的“PhotoAlbum”文件夹中有24个图像。如何删除“PhotoAlbum”中的选定图像？我如何传递对象索引？

我有这样的事情：

- (id <MWPhoto>)photoBrowser:(MWPhotoBrowser *)photoBrowser photoAtIndex:(NSUInteger)index 
    { 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"/PhotoAlbum"]; 

    NSString *fullPath = [dataPath stringByAppendingPathComponent:[self.photos objectAtIndex:index]]; 
    NSData *pngData = [NSData dataWithContentsOfFile:fullPath]; 
    UIImage *image = [UIImage imageWithData:pngData]; 

    MWPhoto *photo = [[MWPhoto alloc] initWithImage:image]; 
    return photo; 
} 

Answer 1

您无法通过指定索引中删除。您必须指定要删除的图像名称。它会是这样的

NSString *filePath = [NSString stringWithFormat:@"%@/%@",documentPath,image.imageName]; 

    NSError *error = nil; 
    if ([[NSFileManager defaultManager] fileExistsAtPath:documentPath]){ 
     [[NSFileManager defaultManager] removeItemAtPath:filePath error:&error]; 
} 

Answer 2

这将删除您的图像并返回已删除的图像。

- (id <MWPhoto>)photoBrowser:(MWPhotoBrowser *)photoBrowser photoAtIndex:(NSUInteger)index 
    { 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"/PhotoAlbum"]; 

    NSString *fullPath = [dataPath stringByAppendingPathComponent:[self.photos objectAtIndex:index]]; 
    NSData *pngData = [NSData dataWithContentsOfFile:fullPath]; 
    UIImage *image = [UIImage imageWithData:pngData]; 

    MWPhoto *photo = [[MWPhoto alloc] initWithImage:image]; 
    if ([[NSFileManager defaultManager] fileExistsAtPath:fullPath]){ 
      [[NSFileManager defaultManager] removeItemAtPath:fullPath error:&error]; 
    } 

    return photo; 
}