在cellForRowAtIndexPath中的UITableViewCell的子类中显示UIImageView

Question

I have a property of DotImageView in my UITableViewCell subclass.

@property (nonatomic, retain) IBOutlet UIImageView *DotImageView;

I try to display it like this in the cellForRowAtIndexPath method:

static NSString *TargetCellIdentifier = @"TargetDetailTableViewCellIdentifier";
    TargetDetailTableViewCell *cell = (TargetDetailTableViewCell *)[tableView dequeueReusableCellWithIdentifier:TargetCellIdentifier];
if (cell == nil) {
    UINib *nib = [UINib nibWithNibName:@"TargetDetailTableViewCell" bundle:nil];
    [nib instantiateWithOwner:self options:nil];
    cell = self.TargetCell;
    self.TargetCell = nil;
}
NSUInteger row = [indexPath row];
NSInteger section = [indexPath section];

Target *aTarget = [targetDictionary objectForKey:[NSNumber numberWithInteger:section]];

if (row == 0) {
        UIImage *dot;
        if (aTarget.importance == high) {
            dot = [UIImage imageNamed:@"dot_red.png"];
        }
        else {
            dot = [UIImage imageNamed:@"dot_gray.png"];
        }
        UIImageView *variantImageView = [[UIImageView alloc] initWithImage:dot];
        cell.DotImageView = variantImageView;
        [variantImageView release];
        return cell;

I do not see any image in my cell. The other labels of my subclass of UITableViewCell do get displayed. Am I missing something with UIImageView? I'm not super familiar with it. Thanks.

Answer 1

Insert into TargetDetailTableViewCell Class the method:

- (void)setDotImage:(UIImage*)dot{



[self.DotImageView setImage:dot];


}

It works for me. I hope it can help you!

Answer 2

change your code as

if (row == 0) {
        UIImage *dot;
        if (aTarget.importance == high) {
            dot = [UIImage imageNamed:@"dot_red.png"];
        }
        else {
            dot = [UIImage imageNamed:@"dot_gray.png"];
        }
        cell.DotImageView.image = dot;
        return cell;

what you was doing is you are assigning new UIImageView object to cell.DotImageView now your cell.DotImageView is pointing to this local image view object not to that object which is on xib

Answer 3

I got it working with

[cell.DotImageView setImage:dot];

I'm not sure why it works vs the other method I originally had.

Answer 4

1 - Basic case

Simply use the image property of the standard UITableViewCell. It is suitable for most cases.

2 - Your custom case

Take care, your property is a simple reference to your imageView. So changing its value does not replace the initial one in the subviews tree. Instead, keep your imageView and just set its UIImage property would be better.

yourImageView.image = aNewImage.