How to set UIImageView image added in viewForHeaderInSection and set in another Method - objective-c

Question

How to set UIImageView image added in viewForHeaderInSection and set in another Method.
- (NSInteger)numberOfSectionsInTableView:(TQMultistageTableView *)mTableView
{
return 4;
}
- (UIView *)mTableView:(TQMultistageTableView *)mTableView viewForHeaderInSection:(NSInteger)section;
{
UIView *header = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 90)];
header.layer.backgroundColor = [UIColor whiteColor].CGColor;
header.layer.masksToBounds = YES;
UILabel *sectionTitleLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, self.view.frame.size.width - 110, 70)];
sectionTitleLabel.text = [sectionTitleArray objectAtIndex:section];
sectionTitleLabel.textAlignment = NSTextAlignmentCenter;
sectionTitleLabel.font = [UIFont fontWithName:#"Helvetica-Neue" size:15];
sectionTitleLabel.numberOfLines = 0;
sectionTitleLabel.contentMode = NSLineBreakByWordWrapping;
[header addSubview:sectionTitleLabel];
UIImageView *locationImageView = [[UIImageView alloc] initWithFrame:CGRectMake(self.view.frame.size.width - 90, 0, 90, 90)];
locationImageView.image = [locationImageArray objectAtIndex:section];
locationImageView.backgroundColor = [UIColor brownColor];
[header addSubview:locationImageView];
UILabel *sectionLineLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, header.frame.size.height - 1, self.view.frame.size.width, 1)];
sectionLineLabel.backgroundColor = [UIColor blackColor];
[header addSubview:sectionLineLabel];
discloserImageView = [[UIImageView alloc] initWithFrame:CGRectMake(locationImageView.frame.size.width - 50, 0, 40, 40)];
discloserImageView.image = [UIImage imageNamed:#"down-arrow.png"];
discloserImageView.backgroundColor = [UIColor brownColor];
discloserImageView.tag = section;
[locationImageView addSubview:discloserImageView];
return header;
}
- (void)mTableView:(TQMultistageTableView *)mTableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"didSelectRow ----%ld",(long)indexPath.row);
}
#pragma mark - Header Open Or Close
- (void)mTableView:(TQMultistageTableView *)mTableView willOpenHeaderAtSection:(NSInteger)section
{
NSLog(#"Open Header ----%d",section);
// UITableViewHeaderFooterView *header = [self mTableView:mTableView viewForHeaderInSection:section];
UIView *headerView = [self mTableView:mTableView viewForHeaderInSection:section];
[[[headerView subviews] objectAtIndex:1] subviews];
NSLog(#"HeaderView :%#",headerView);
for (UIImageView *imageView in [[[headerView subviews] objectAtIndex:1] subviews]) {
if ([ imageView isKindOfClass:[UIImageView class]])
{
imageView.image = [UIImage imageNamed:#"up-arrow.png"];
}
}
}

Answer 1

In your code your header is not a UIImageView so your condition if ([header isKindOfClass:[UIImageView class]]) will never be true. Indeed, you add your UIImageView as a subview of a UIView.
What you can do instead is :
if ([[header subviews][0] isKindOfClass:[UIImageView class]])
{
UIImageView *imageViewChange =(UIImageView *) imageView;
imageViewChange.image = [UIImage imageName#"downArrow.png"];
}
Edit :
According to your edit, I think your best bet is to make your UIImageView a property as follows :
#interface YourViewController () {
UIImageView *imageViewChange;
}
and use it like that :
imageViewChange.image = [UIImage imageName#"downArrow.png"];