如何在表视图单元格上加载不同的图像

Question

I have two views in 1st view say A for save an image in document directory on save button click and then second view say B. I have two upload that image with specific cell of the table.In below code i am trying to compare the image with specific user email id.Email is common in both views. So can i differentiate the specific user with their email and on their table view cell we show their images differently. But i am not able to do that... How can this to be achieved in Ios? AnyOne can help me out for this....My Code for save and load image in document directory are enter code here

View A

-(void)saveImage: (UIImage*)image
{
    if (image != nil)
    {
        NSArray *paths =  NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSString* path = [documentsDirectory stringByAppendingPathComponent:
                              @"iosImage.png" ];
        NSString *fileName = [path stringByAppendingFormat:email];
        NSLog(@"The result of Concatenate String =%@",fileName);
        NSData* data = UIImagePNGRepresentation(image);
                  [data writeToFile:path atomically:YES];
        NSLog(@"The Path of the directory %@",path);
    }
}

View B

- (UIImage*)loadImage
{
    NSLog(@"Email^^^^^^^^^%@",imgEmail);
    NSError *error;
    NSFileManager *fileMgr = [NSFileManager defaultManager];
    NSArray *paths =        NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString* path = [documentsDirectory stringByAppendingPathComponent:
                          @"iosImage.png" ];
    UIImage* image = [UIImage imageWithContentsOfFile:path];
    NSLog(@"Documents directory: %@",[fileMgr     contentsOfDirectoryAtPath:documentsDirectory error:&error]);
    return image;
}

Answer 1

You can modified saveImage and loadImage function as per below.

-(void)saveImage: (UIImage*)image filePath:(NSString*)fileNameEmail
{
     if (image != nil)
     {
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:fileNameEmail];

        NSData* data = UIImagePNGRepresentation(image);
              [data writeToFile:filePath atomically:YES];

     }
}

- (UIImage*)loadImage:(NSString*)fileNameEmail
{
     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
     NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:fileNameEmail];
     UIImage *image = [[UIImage alloc] initWithContentsOfFile:filePath];
     return image;
}

Edit : You can get specific image like below.

-(UITableViewCell *)tableView:(UITableView *)tableView  cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];

    cell.youimageview.image = [self loadImage:[[yourArray indexOfObject:indexPath.row] valueForKey:@"youemailkey"]];
    return cell;
}

may this help you.

Answer 2

如果您在文档目录中保存了不同的图像，但是在tableview单元格中加载时，它会显示一个图像，然后在设置新图像之前将图像视图的图像设置为Nil，如下所示：

cell.imageView.image = Nil;

Answer 3

By using the below code we can asynchronously paste image on table view cell.

NSString *imageName=[NSString stringWithFormat:@"%@.png",d.emailId];

UIImage *image = [self loadImage:imageName];  
if (image==nil)
{
    [imgProfilePic setImage:[UIImage imageNamed:@"userEdit.png"]];
}
else
{
    [imgProfilePic setImage:image];
}
photos =image;

NSLog(@"^^^^^^^^^^^^^^%@",photos);

[cell.contentView addSubview:imgProfilePic];

Answer 4

Also you can use like that,

-(NSString *)ImageString{

    NSData *imgdata = UIImageJPEGRepresentation(self.imgView.image, 0.5);
    NSString *imagename =[self generateImageName];

    NSFileManager *fileManager = [NSFileManager defaultManager];
    [fileManager createFileAtPath:[NSString stringWithFormat:@"%@/%@",   DOCUMENTS_FOLDER,imagename]
                         contents:imgdata
                       attributes:nil];
    return imagename;

    }
       -(NSString *)generateImageName{

        int timestamp = [[NSDate date] timeIntervalSince1970];
        NSString *StrImage = [NSString stringWithFormat:@"Image_%d.png",timestamp];
        NSLog(@"image name=%@",StrImage);
        return StrImage;
    }

And Define In Header like that,

#define DOCUMENTS_FOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]