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POapplicationWillEnterForeground: reload Data from ViewController
 

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    <p>I want my app to reload data as soon as the app switches from the background to the foreground.</p> <p>Thats my code:</p> <p>DataAppDelegate.h</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import "DataViewController.h" @class DataViewController; @interface DataAppDelegate : NSObject &lt;UIApplicationDelegate&gt; { UIWindow *window; DataViewController *viewController; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet DataViewController *viewController; @end </code></pre> <p>AppDelegate.m</p> <pre><code>#import "DataAppDelegate.h" #import "DataViewController.h" @implementation DataAppDelegate @synthesize window; @synthesize viewController; #pragma mark - #pragma mark Application lifecycle - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch. // Add the view controller's view to the window and display. [self.window addSubview:viewController.view]; [self.window makeKeyAndVisible]; return YES; } - (void)applicationWillResignActive:(UIApplication *)application { NSLog(@"app will resign active"); } - (void)applicationDidEnterBackground:(UIApplication *)application { NSLog(@"app did enter background"); [DataViewController refresh]; } - (void)applicationWillEnterForeground:(UIApplication *)application { NSLog(@"app will enter foreground"); [DataViewController refresh]; } </code></pre> <p>DataViewController.h</p> <pre><code> @interface DataViewController : UIViewController&lt;UIWebViewDelegate, ADBannerViewDelegate&gt; { IBOutlet UIWebView *webView; IBOutlet UITextField *addressBar; IBOutlet UIActivityIndicatorView *activityIndicator; IBOutlet UILabel *myField2; IBOutlet UILabel *myField3; IBOutlet UILabel *myField4; IBOutlet UILabel *myField5; IBOutlet UILabel *myField6; ADBannerView *adView; BOOL bannerIsVisible; } @property(nonatomic,retain) UIWebView *webView; @property(nonatomic,retain) UITextField *addressBar; @property(nonatomic,retain) UIActivityIndicatorView *activityIndicator; @property(nonatomic,assign) BOOL bannerIsVisible; -(IBAction) goBack:(id)sender; -(IBAction) goForward:(id)sender; -(IBAction) refresh:(id)sender; -(IBAction) goImpressum:(id)sender; @end </code></pre> <p>DataViewController.m</p> <pre><code>- (void) viewDidLoad { [self loadData]; } - (void)loadData { // contains information the ViewController makes use of } -(IBAction)refresh:(id) sender { [self loadData]; } </code></pre> <p>With that code i get two warnings:</p> <p>'DataViewController' may not respond to '+refresh'</p> <p>but it does work.</p> <p>If i cut the line in method "applicationDidEnterBackground:" it doesn't work anymore, the app crashes. Why? How do i have to fill the applicationDidEnterBackground: method? DO i need to book some space for my application? how do I do that?</p> <p>How am I able to solve these warnings? Appearently my application does not know the refresh method, but why does it work in my example above?</p> <p>Thanks in advance for your help :)</p>
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