I think you have to store somewhere (like an NSMutableArray instance variable) the indexPath you are downloading. so you can do something like that :
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
if( [indexArray indexOfObject:indexPath] != NSNotFound )
{
// alpha for downloading
}
}
In your AFNetworking completion blocks you should remove this indexPath from you indexArray.
As comments said, cells are not reliable for storing any kind of information as they are reallocated when you scroll
@interface ViewController ()
{
NSMutableArray *_indexArray;
}
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
UITableView *table = [[UITableView alloc] initWithFrame:self.view.frame style:UITableViewStylePlain];
table.delegate = self;
table.dataSource = self;
_indexArray = [@[] mutableCopy];
[self.view addSubview:table];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;
{
return 50;
}
// called when you scroll to new cells or when reloadData is called
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{
UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"default"];
cell.textLabel.textColor = [UIColor blueColor];
// red color if I'm downloading, else blue
if ([_indexArray indexOfObject:indexPath] != NSNotFound) {
cell.textLabel.textColor = [UIColor redColor];
}
cell.textLabel.text = @"cell in the table";
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;
{
[_indexArray addObject:[indexPath copy]];
NSLog(@"downloading...");
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
cell.textLabel.textColor = [UIColor redColor]; // update UI temporary (until scroll)
// HD Image so I can scroll up and down for testing
NSString *res = @"http://res.cloudinary.com/******/image/upload/*****/Motorola_Razr_HD_Cam_Sample_7_ftzrj0.jpg";
// custom class for download
[[PLSApi api] downloadDataAtURL:[NSURL URLWithString:res] withBlock:^(NSData *data) {
// download complete
[_indexArray removeObject:indexPath];
cell.textLabel.textColor = [UIColor blueColor]; // update UI
NSLog(@"finished...");
}];
}