iOS 8共享扩展名显示共享图像问题 [英] iOS 8 share extension show shared image issue

问题描述

我在UIImageView中显示图像时遇到问题.

I have a problem with displaying image in my UIImageView.

这就是我在ShareViewController中获取图像的方式:

So this is how I get images in ShareViewController:

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    for (NSItemProvider* itemProvider in ((NSExtensionItem*)self.extensionContext.inputItems[0]).attachments )
    {
        if([itemProvider hasItemConformingToTypeIdentifier:@"public.image"])
        {
            ++counter;

            [itemProvider loadItemForTypeIdentifier:@"public.image" options:nil completionHandler:
             ^(id<NSSecureCoding> item, NSError *error)
             {
                 UIImage *sharedImage = nil;

                 if([(NSObject*)item isKindOfClass:[NSURL class]])
                 {
                     sharedImage = [UIImage imageWithData:[NSData dataWithContentsOfURL:(NSURL*)item]];
                 }
                 if([(NSObject*)item isKindOfClass:[UIImage class]])
                 {
                     sharedImage = (UIImage*)item;
                 }
                 if ([(NSObject *)item isKindOfClass:[NSData class]])
                 {
                     sharedImage = [UIImage imageWithData:(NSData *)item];
                 }

                 [[NSNotificationCenter defaultCenter] postNotificationName:@"kNotificationDidLoadItem" object:sharedImage];
             }];
        }
    }
}

这是我在DetailsViewController中接收通知的方式:

this is how I receive notification in DetailsViewController:

- (void)didLoadSharedImage:(NSNotification *)notification {

    UIImage *sharedImage = [notification object];
    [self.sharedImages addObject:sharedImage];

    if (!self.theImageView.image) {

        self.theImageView.image = sharedImage;
    }
}

因此，此方法后没有可见的图像.我调试了它，然后看到了那个图像，但是奇怪的是，当我从DetailsViewController推送新的视图控制器然后又弹出时看到了它.只有这样，UIImageView才好像刷新了自己.

So there is no visible image after this method. I debugged it and I saw that image is there, but it's strange that I see it when I push new view controller form DetailsViewController and then pop back. Only then UIImageView seems like refresh its self.

推荐答案

您是否尝试将didLoadSharedImage执行到UIThread中.像

Did you try to execute didLoadSharedImage into UIThread. like

dispatch_async(dispatch_get_main_queue(), ^{ 
          if (!self.theImageView.image) {
          self.theImageView.image = sharedImage; 
          } 
})

祝你好运

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