Customize URL for iOS sharing

Question

It's pretty clear to me how to share a link with the iOS sharing activity... But I would like to customize the tracking in the url for different kind of shares, always using the same standard... Examples following...

Twitter:

http://www.example.com?utm_source=TWITTER&utm_medium=social&utm_campaign=socialbuttons&utm_content=app_android

Facebook:

http://www.example.com?utm_source=FACEBOOK&utm_medium=social&utm_campaign=socialbuttons&utm_content=app_android

Etc...

Is it possible? How can I do it?

Answer 1

I solved in Objective-C by adding a custom UIActivityItemProvider:

#import "CustomUiActivityItemProvider.h"

@implementation CustomUiActivityItemProvider

- (id)initWithText:(NSString *)text{

    if ((self = [super initWithPlaceholderItem:text])) {
        self.text = text ?: @"";
        self.url = @"";
    }
    return self;
}

- (id)item {
    NSString *activityType = self.activityType;

    if ([self.placeholderItem isKindOfClass:[NSString class]]) {

        if ([self.activityType isEqualToString:UIActivityTypePostToFacebook]) {
            self.url = [[NSString alloc] initWithFormat:@"%@&utm_source=facebook", self.text];
        } else if ([activityType isEqualToString:UIActivityTypePostToTwitter]) {
            self.url = [[NSString alloc] initWithFormat:@"%@&utm_source=twitter", self.text];
        } else if ([activityType isEqualToString:UIActivityTypeMessage]) {
            self.url = [[NSString alloc] initWithFormat:@"%@&utm_source=message", self.text];
        } else if([activityType isEqualToString:UIActivityTypeMail]){
            self.url = [[NSString alloc] initWithFormat:@"%@&utm_source=email", self.text];
        } else if ([activityType isEqualToString:UIActivityTypePostToWeibo]){
            self.url = [[NSString alloc] initWithFormat:@"%@&utm_source=weibo", self.text];
        }else{
            self.url = [[NSString alloc] initWithFormat:@"%@&utm_source=other", self.text];
        }

        return self.url;
    }

    return self.placeholderItem;
}

@end

And using it like this:

CustomUiActivityItemProvider *customProvider = [[CustomUiActivityItemProvider alloc] initWithText:urlString];


UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:@[customProvider]
                                                                         applicationActivities:nil];
activityVC.excludedActivityTypes = @[UIActivityTypePrint, UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll];
activityVC.completionHandler = ^(NSString *activityType, BOOL completed) {
 // CODE.... 
}
   [self presentViewController:activityVC animated:YES completion:nil];