iOS 6 - UIActivityViewController Artikel

Question

Ich hoffe, dass alle iOS 6 enthält neue Stil von ActionSheet (UIActivityViewController). Die UIActivityViewController kann mit den Parametern wie Zeichenfolge, URL, Bild usw. initiiert werden. Unten ist der Codeausschnitt dafür (wo Elemente ist ein Array mit String und URL Params).

UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:items applicationActivities:nil]; 

Aber ist es eine Möglichkeit, dass wir verschiedene Parameter zuweisen können, wenn wir verschiedene Aktienoptionen wie Mail, Facebook oder Twitter wählen?

Eine Methode ist, wir UIActivityItemSource implementieren können, wo wir die Quelle Methoden

- (id)activityViewController:(UIActivityViewController *)activityViewController itemForActivityType:(NSString *)activityType 

, die immer wieder einen String-Wert implementieren müssen. Aber ich muss ein Array übergeben, damit ich verschiedene Parameter wie URL, Bild und einen Titel zuweisen kann.

Irgendeine Idee, wie wir das erreichen können?

Answer 1

Sie können nichts für die integrierten iOS UIActivityViewController Elemente wie Mail, Facebook und Twitter ändern. Um benutzerdefinierte Aktionen für Elemente in Ihrem UIActivityViewController zu implementieren, müssen Sie für jede benutzerdefinierte Aktivität eine benutzerdefinierte Unterklasse von UIActivity erstellen. Hier ein Beispiel:

- (UIActivityViewController *)getActivityViewController { 
    MyFeedbackActivity *feedbackActivity = [[MyFeedbackActivity alloc] init]; 
    MyFacebookActivity *facebookActivity = [[MyFacebookActivity alloc] init]; 
    MyMailActivity *mailActivity = [[MyMailActivity alloc] init]; 

    NSArray *applicationActivities = @[feedbackActivity, facebookActivity, mailActivity]; 
    NSArray *activitiesItems = @[@"A string to be used for MyFeedbackActivity", @"A string to be used for MyFacebookActivity", @"A string to be used for MyMailActivity"]; 

    UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:activitiesItems applicationActivities:applicationActivities]; 

    // Removed un-needed activities 
    activityVC.excludedActivityTypes = [[NSArray alloc] initWithObjects: 
                UIActivityTypeCopyToPasteboard, 
                UIActivityTypePostToWeibo, 
                UIActivityTypePostToFacebook, 
                UIActivityTypeSaveToCameraRoll, 
                UIActivityTypeCopyToPasteboard, 
                UIActivityTypeMail, 
                UIActivityTypeMessage, 
                UIActivityTypeAssignToContact, 
                nil]; 

    return activityVC; 
} 

Ein sehr begrenztes Beispiel für eine Unterklasse UIActivity mit Dokumentation zu den Methoden, die Sie in zwingenden interessieren, Ihre benutzerdefinierten Daten/Aktionen zu behandeln.

#import "MyFeedbackActivity.h" 

@implementation MyFeedbackActivity 

- (NSString *)activityType { 
    return @"MyFeedbackActivity"; 
} 

- (NSString *)activityTitle { 
    return @"Feedback"; 
} 

- (UIImage *)activityImage { 
    return [UIImage imageNamed:@"feedback"]; 
} 

- (BOOL)canPerformWithActivityItems:(NSArray *)activityItems { 
    return YES; 
} 

- (UIViewController *)activityViewController { 
    /** 
    * DESCRIPTION: 
    * Returns the view controller to present to the user. 
    * Subclasses that provide additional UI using a view controller can override this method to return that view controller. If this method returns a valid object, the system presents the returned view controller modally instead of calling the performActivity method. 
    * Your custom view controller should provide a view with your custom UI and should handle any user interactions inside those views. Upon completing the activity, do not dismiss the view controller yourself. Instead, call the activityDidFinish: method and let the system dismiss it for you. 
    */ 
} 

- (void)prepareWithActivityItems:(NSArray *)activityItems { 
    /** 
    * DESCRIPTION: 
    * Prepares your service to act on the specified data. 
    * The default implementation of this method does nothing. This method is called after the user has selected your service but before your service is asked to perform its action. Subclasses should override this method and use it to store a reference to the data items in the activityItems parameter. In addition, if the implementation of your service requires displaying additional UI to the user, you can use this method to prepare your view controller object and make it available from the activityViewController method. 
    */ 
} 

-(void)performActivity { 
    /** 
    * DESCRIPTION: 
    * Performs the service when no custom view controller is provided. 
    * The default implementation of this method does nothing. If your service does not provide any custom UI using the activityViewController method, override this method and use it to perform the activity. Your activity must operate on the data items received in the prepareWithActivityItems: method. 
    * This method is called on your app’s main thread. If your app can complete the activity quickly on the main thread, do so and call the activityDidFinish: method when it is done. If performing the activity might take some time, use this method to start the work in the background and then exit without calling activityDidFinish: from this method. Instead, call activityDidFinish: from your background thread after the actual work has been completed. 
    */ 
} 

@end