iOS 8共享扩展显示共享映像问题
在UIImageView中显示图像时出现问题 这就是我在ShareViewController中获取图像的方式:iOS 8共享扩展显示共享映像问题,ios,ios8,ios8-extension,ios8-share-extension,Ios,Ios8,Ios8 Extension,Ios8 Share Extension,在UIImageView中显示图像时出现问题 这就是我在ShareViewController中获取图像的方式: - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; for (NSItemProvider* itemProvider in ((NSExtensionItem*)self.extensionContext.inputItems[0]).attachments )
- (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];
}];
}
}
}
- (void)didLoadSharedImage:(NSNotification *)notification {
UIImage *sharedImage = [notification object];
[self.sharedImages addObject:sharedImage];
if (!self.theImageView.image) {
self.theImageView.image = sharedImage;
}
}
因此,这种方法之后没有可见的图像。我调试了它,看到了那个图像,但奇怪的是,当我按下新的视图控制器表单DetailsViewController并弹出时,我看到了它。只有在UIImageView看起来像是刷新它自己。您尝试在UIThread中执行didLoadSharedImage。像
dispatch_async(dispatch_get_main_queue(), ^{
if (!self.theImageView.image) {
self.theImageView.image = sharedImage;
}
})
祝你好运你能给我们提供更多细节吗?MustafaIbrahim,我有两个UIViewController,第一个是根控制器,它有扩展上下文。从第一个控制器,我得到了上面代码中的图像。在我得到一个图像后,我通过通知将其发送给第二视图控制器,并且上面还有接收器的代码。但图像延迟出现或有时不出现。或者在我从second view controller推送然后返回后,image view会神奇地更新它自己当你发布通知时second view controller是否加载到内存中?@MustafaIbrahim当然,我甚至可以跟踪-(void)didLoadSharedImage:(NSNotification*)通知并调用它。所以在调试器中,我看到了我设置的图像。您是否尝试将didLoadSharedImage执行到UIThread中。类似于dispatch_async(dispatch_get_main_queue(),^{if(!self.theImageView.image){self.theImageView.image=sharedImage;}})
-loadItemForTypeIdentifier:options:completionHandler:
未在主线程上调用,需要分派到主线程上。看见