Question

Hey guys,
So…. lets say I have an NSArray of images

NSMutableArray *images = [NSMutableArray new];
[images addObject:[UIImage imageNamed:@"line1.png"]];
[images addObject:[UIImage imageNamed:@"line2.png"]];
[images addObject:[UIImage imageNamed:@"line3.png"]];
[images addObject:[UIImage imageNamed:@"line4.png"]];

Now I would like to load all these at once using a for loop but here is the catch…. I need to be able to set the images as hidden until the user unhides through interaction.

 for (UIImage *image in images) {
    UIImageView *line = [[UIImageView alloc] initWithImage:image];
    line.hidden = YES;
    [self.view addSubview:line];
}

But then how to I set the hidden BOOL to NO using another method?

As a secondary question, how would one release *line in the code above?

Thanks,
Darren

Answer 1

One option is to set up your images like:

int nextTag = 1;
for (UIImage *image in images) {
    UIImageView *line = [[UIImageView alloc] initWithImage:image];
    line.hidden = YES;
    line.tag = nextTag;
    [self.view addSubview:line];
    [line release];
    nextTag++;
}

…and then to unhide them you can do:

UIView* imageView = [self.view viewWithTag: lineNumber];
imageView.hidden = NO;

…assuming that your user-interaction handler is able to determine what line in the UI the user is interacting with.