Gluon Mobile Share Button Implementation

问题

Does Gluon Mobile have any guidance on implementing a share button? My goal is to be able to share a string containing a link to different apps on the phone. At the moment, I need this only for the iOS implementation. I was able to find this link that provides a simple way to do this in Objective-C:

- (IBAction)shareButton:(UIBarButtonItem *)sender
{
    NSString *textToShare = @"Look at this awesome website for aspiring iOS Developers!";
    NSURL *myWebsite = [NSURL URLWithString:@"http://www.codingexplorer.com/"];

    NSArray *objectsToShare = @[textToShare, myWebsite];

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

    NSArray *excludeActivities = @[UIActivityTypeAirDrop,
                                   UIActivityTypePrint,
                                   UIActivityTypeAssignToContact,
                                   UIActivityTypeSaveToCameraRoll,
                                   UIActivityTypeAddToReadingList,
                                   UIActivityTypePostToFlickr,
                                   UIActivityTypePostToVimeo];

    activityVC.excludedActivityTypes = excludeActivities;

    [self presentViewController:activityVC animated:YES completion:nil];
}

Looking at the GoNative application example on the Gluon website, it seems like I can use the above code snippet where needed as the native iOS code. Do I have to update the ios build gradle to account for the UIActivity class mentioned in the first link above?

Update*

I have been able to get this to work based on help in this question here.

However when trying to install the native library, I get this error which is understandable as self is unknown in the scope of the code. How would I be able to do this? Instantiate a popover or dialog and pass the activityVC to it?

/Users/ashishsharma/NetBeansProjects/konfamdbranch/src/ios/n‌​ative/Share.m:25:6: error: use of undeclared identifier 'self' [self presentViewController:activityVC animated:YES completion:nil];

回答1:

So I was able to solve this using examples on the internet (shown above) along with going through the existing code for the Barcode Scan Service. The issue I was experiencing with the above code was that the present view controller could not be found. However, looking at the bit bucket source for Barcode Scan, I was able to get the root view with the following code:

if(![[UIApplication sharedApplication] keyWindow])
{
    NSLog(@"key window was nil");
    return;
}

// get the root view controller
UIViewController *rootViewController = [[[UIApplication sharedApplication] keyWindow] rootViewController];
if(!rootViewController)
{
    NSLog(@"rootViewController was nil");
    return;
}

Then in the code snippet I placed in the question, replace self with rootViewController:

[rootViewController presentViewController:activityVC animated:YES completion:nil];

This leads to the modified code snippet:

#import <UIKit/UIKit.h>

#include "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/JavaVM.framework/Versions/A/Headers/jni.h"

JNIEXPORT void JNICALL     Java_com_gluonhq_charm_down_plugins_ios_IOSShareService_shareMessage
(JNIEnv *env, jclass jClass, jstring jMessage) {

    if(![[UIApplication sharedApplication] keyWindow])
    {
        NSLog(@"key window was nil");
        return;
    }

    // get the root view controller
    UIViewController *rootViewController = [[[UIApplication sharedApplication] keyWindow] rootViewController];
    if(!rootViewController)
    {
        NSLog(@"rootViewController was nil");
        return;
    }

    NSString *textToShare = @"Check out this site!";
    NSURL *myWebsite = [NSURL URLWithString:@"http://www.google.com/"];

    NSArray *objectsToShare = @[textToShare, myWebsite];

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

    NSArray *excludeActivities = @[UIActivityTypeAirDrop,
                                   UIActivityTypePrint,
                                   UIActivityTypeAssignToContact,
                                   UIActivityTypeSaveToCameraRoll,
                                   UIActivityTypeAddToReadingList,
                                   UIActivityTypePostToFlickr,
                                   UIActivityTypePostToVimeo];

    activityVC.excludedActivityTypes = excludeActivities;

   [rootViewController presentViewController:activityVC animated:YES completion:nil];

}

Note I followed the GoNative application to generate my objective-c/ios files correctly.

This leads to a minimal functionality share implementation only because I don't have Facebook installed on the IPhone simulator.

来源：https://stackoverflow.com/questions/43838857/gluon-mobile-share-button-implementation