iPhone - Error setting up block that takes an array - iphone

Question

I am writing as a follow up to this question I asked yesterday, but I have not heard back from the original responder. I would be happy to wait, but I have a small time limit. He helped me tremendously with my NSURLConnection code, and I understand perfectly how this is working, but I can't seem to get the syntax correct.
I can't get handler:^ to be recognized and this line:
[self loadImageArray:urlArray handler:^(NSMutableArray *)imageArray
and it needs to take an array (imageArray from loadImageArray) that is populated with images.
- (void)loadImageArray:(NSArray *)urls handler:(void(^)( handler)
This should populate an array (imageArray) asynchronously from the server.
How do I setup the block calls correctly? I have read about blocks on a few sites, but none of the suggestions have helped.
Again, I have asked the original responder, but have not heard back.
I hope that edit helps. Thank you!
Here is my .h
#interface OBNSURLViewController : UIViewController
{
NSArray *jsonArray;
NSMutableData *theJsonData;
IBOutlet UIView *mainView;
__weak IBOutlet UIImageView *mainImage;
__weak IBOutlet UILabel *mainLabel;
}
#property (nonatomic, strong) NSData *serverData;
#property (strong, nonatomic) IBOutlet UIScrollView *mainScroll;
#property (nonatomic, retain) NSMutableArray *imageArray;
#property (nonatomic, retain) NSMutableArray *urlArray;
#property (nonatomic, retain) UIImage *imageData;
#end
Here is the relavent code I am stuck on:
- (void)parseJSONAndGetImages:(NSData *)data
{
//initialize urlArray
urlArray = [[NSMutableArray alloc]init];
//parse JSON and load into jsonArray
jsonArray = [NSJSONSerialization JSONObjectWithData:theJsonData options:nil error:nil];
//assertion?
assert([jsonArray isKindOfClass:[NSArray class]]);
//Make into one liner with KVC.... Find out what KVC is
//Code to load url's into array goes here....
//load the images into scrollview after fetching from server
[self loadImageArray:urlArray handler:^(NSMutableArray *)imageArray //Here is a big problem area
{
//work goes here....
}];
}
- (void)loadImageArray:(NSArray *)urls handler:(void(^)( handler)//This does not want to work either. I am stuck on handler???
{ dispatch_async(0, ^{
//imageArray = [NSMutableArray array];
for (int y = 0; y < urlArray.count; y++)
{
//stuff goes here.....a
});
dispatch_async(dispath_get_main_queue(),^{
handler(imageArray);
});
}

Answer 1

As I'm reading this, the method syntax should look like the following. If the handler block takes an argument, you need to declare that it does.
- (void)loadImageArray:(NSArray *)urls handler:(void (^)(NSMutableArray *imageArray))handler
{
NSMutableArray *imageArray = [NSMutableArray array];
// Do something with the urls array to fill in entries in imageArray...
handler(imageArray);
}
You would call the method like this:
NSArray *urls = // filled in somewhere else...
[myObject loadImageArray:urls handler:^(NSArray *imageArray) {
NSLog(#"%#", imageArray);
}];