iOS 6 - UIActivityViewController öğeleri

Question

Herkesin bildiği gibi iOS 6'nın yeni stili ActionSheet (UIActivityViewController). içeriyor UIActivityViewController dize, url, resim vb. Gibi parantezler ile başlatılabilir. Aşağıda bunun için kod pasajı var. dize ve url paramları).

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

Ama biz Posta, Facebook veya Twitter gibi farklı paylaşım seçenekleri seçtiğinizde farklı parametreler atayabilirsiniz bir yolu var mı?

bir yöntemi biz kaynak yöntemleri her zaman bir dize değeri döndürür

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

uygulamak gerekir UIActivityItemSource, uygulayabilir olduğunu. Ancak bir dizi iletmem gerekiyor, böylece URL, resim ve bir başlık gibi çeşitli parametreler atayabilirim.

Bunu nasıl başarabileceğimize dair bir fikriniz var mı?

Answer 1

Mail, Facebook ve Twitter gibi iOS UIActivityViewController öğelerinde yerleşik hiçbir şeyi değiştiremezsiniz. UIActivityViewController öğenizdeki öğeler için özel eylemler uygulamak için, istediğiniz her özel etkinlik için özel bir UIActivity alt sınıfı oluşturmanız gerekir. İşte bir örnek:

- (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; 
} 

size özel veri/işlemleri işlemek üzere geçersiz kılma ile ilgilenecek yöntemleri üzerine belgelerle subclassed UIActivity Çok sınırlı bir örnek.

#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