Question

首先，我从照片库中选择了图像到ALAsset Library，之后我将图像存储在ALAsset库路径的文档目录中。

我正在使用此代码将图像存储在ALAsset Library的文档目录中....它的工作完美...现在我想在表格视图中显示存储在文档目录中的所有图像..我该怎么做??? 谁能帮助我？

将图像从ALAsset Library导入NSdocument目录的代码

for (int j=0; j<[assetArray count]; j++) {

ALAssetRepresentation *representation = [[assetArray objectAtIndex:j] defaultRepresentation];
NSString* filename = [documentPath stringByAppendingPathComponent:[representation filename]];

[[NSFileManager defaultManager] createFileAtPath:filename contents:nil attributes:nil];
NSOutputStream *outPutStream = [NSOutputStream outputStreamToFileAtPath:filename append:YES];
[outPutStream open];

long long offset = 0;
long long bytesRead = 0;

NSError *error;
uint8_t * buffer = malloc(131072);
while (offset<[representation size] && [outPutStream hasSpaceAvailable]) {
    bytesRead = [representation getBytes:buffer fromOffset:offset length:131072 error:&error];
    [outPutStream write:buffer maxLength:bytesRead];
    offset = offset+bytesRead;
}
[outPutStream close];
free(buffer);

}

之后，我使用以下代码获取了目录的内容：

 NSFileManager *manager = [NSFileManager defaultManager];
fileList = [manager directoryContentsAtPath:newDir];

它也有效...但现在我想显示文档目录中的图像。它没有任何显示......

 setImage.image=[UIImage imageNamed:[filePathsArray objectAtIndex:0]];

任何人都可以帮忙，问题出在哪里????? - 我有一个疑问： *是否将图像从ALAsset库导入文档目录???

是正确的方法

Answer 1

这个答案是关于如何从文档目录中检索图像并将它们显示到UITableView ... ..

首先，您必须将文档目录中的所有图像都添加到数组....

-(void)viewWillAppear:(BOOL)animated
{

    arrayOfImages = [[NSMutableArray alloc]init];
NSError *error = nil;


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

    NSArray *filePathsArray = [[NSFileManager defaultManager] subpathsOfDirectoryAtPath: stringPath  error:&error];

  for(int i=0;i<[filePathsArray count];i++)
  {
      NSString *strFilePath = [filePathsArray objectAtIndex:i];
      if ([[strFilePath pathExtension] isEqualToString:@"jpg"] || [[strFilePath pathExtension] isEqualToString:@"png"] || [[strFilePath pathExtension] isEqualToString:@"PNG"]) 
      {
         NSString *imagePath = [[stringPath stringByAppendingString:@"/"] stringByAppendingString:strFilePath];
         NSData *data = [NSData dataWithContentsOfFile:imagePath];
        if(data)
        {
          UIImage *image = [UIImage imageWithData:data];
          [arrayOfImages addObject:image];
        }
      }

  }

}

之后 - 使用此数组，您可以在uitableview单元格中显示图像记住不要在你的视图上添加表视图，直到你的数组填满.....

#pragma mark - UItableViewDelegate methods
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [arrayOfImages count];
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tablView dequeueReusableCellWithIdentifier:CellIdentifier];
    if(cell == nil)
    {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    //adjust your imageview frame according to you
    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0.0, 0.0, 470.0, 80.0)];

    [imageView setImage:[arrayOfImages objectAtIndex:indexPath.row]];
    [cell.contentView addSubview:imageView];
    return cell;

}

现在运行它会起作用..

Answer 2

您可以直接获取内容：

NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject] error:NULL];

设置图片：

[imgView setImage:[UIImage imageWithContentsOfFile:"Your complete path"]];

Answer 3

您可以通过以下方式从文档目录中获取所有图像文件：

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

    NSArray *filePathsArray = [[NSFileManager defaultManager] subpathsOfDirectoryAtPath:documentsDirectory  error:nil];
    NSMutableArray *imgFiles = [[NSMutableArray alloc] init];
    for (int i=0; i<filePathsArray.count; i++) {
        NSString *strFilePath = [filePathsArray objectAtIndex:0];
        if ([[strFilePath pathExtension] isEqualToString:@"jpg"]) {
            [imgFiles addObject:[filePathsArray objectAtIndex:i]];
        }
    }

    NSLog(@"array with paths of image files in the Document Directory %@", filePathsArray);

然后您可以将图像显示在UITableView中，如下所示：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }
    UIImageView *img = [[UIImageView alloc] initWithFrame:CGRectMake(5, 5, 50, 50)];
    img.image = [UIImage imageWithContentsOfFile:[imgFiles objectAtIndex:indexPath.row]];
    [cell addSubview:img];

    return cell;
}

干杯!!!

如何显示NSDocument目录中的所有图像

3 个答案: