Background Fetch Sample

gistfile1.m

// AppDelegate.m
 
#import "AppDelegate.h"
#import "LiveTableViewController.h" // Import the view controller you want to update in the background

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [[UIApplication sharedApplication] setMinimumBackgroundFetchInterval:UIApplicationBackgroundFetchIntervalMinimum];
    return YES;
}


-(void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
    
    UINavigationController *navigationController = (UINavigationController*)self.window.rootViewController;
    
    id topViewController = navigationController.topViewController;
    if ([topViewController isKindOfClass:[LiveTableViewController class]]) {
        [(LiveTableViewController *)topViewController insertNewObjectForFetchWithCompletionHandler:completionHandler];
    } else {
        NSLog(@"Not the right class %@.", [topViewController class]);
        completionHandler(UIBackgroundFetchResultFailed);
    }
}


//  LiveTableViewController.h


#import <UIKit/UIKit.h>
#import "LiveViewCell.h"
#import "XMLDictionary.h"
#import "LiveMatchObject.h"
#import "MatchDetailViewController.h"

@interface LiveTableViewController : UITableViewController 

- (void)insertNewObjectForFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler; // create a method where you will call the methods you want to run in the background


//  LiveTableViewController.m

- (void)insertNewObjectForFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
    NSLog(@"Update the tableview.");
    [self parseXMLLiveMatch]; // method that parses the XML data
    completionHandler(UIBackgroundFetchResultNewData);
}