I have an image and I want to export it to Instagram, so I can post it.
The code I'm using is:
NSURL *instagramURL = [NSURL URLWithString:#"instagram://location?id=1"];
if ([[UIApplication sharedApplication] canOpenURL:instagramURL]) {
NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:#"Documents"];
NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:#"Image.igo"];
UIImage *image = [UIImage imageNamed:#"01.png"];
NSData *imageData = UIImagePNGRepresentation(image);
[imageData writeToFile:savedImagePath atomically:YES];
NSURL *imageUrl = [NSURL fileURLWithPath:savedImagePath];
NSLog(#"%#",imageUrl);
UIDocumentInteractionController *docController = [[UIDocumentInteractionController alloc] init];
docController.delegate = self;
docController.UTI = #"com.instagram.exclusivegram";
docController.URL = imageUrl;
//[docController setURL:imageUrl];
[docController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES];
}
When I run the app, the App shows the button written "Instagram" its icon, but when I touch it, the button disappear, and nothing happens. The app didn't crash, but nothing happen.
What I missed in my code ?
Regards
Bruno
I guess the problem is you do not retain the UIDocumentInteractionController. Make an ivar for it in your class.
Make sure the method documentInteractionController:didEndSendingToApplication: is called on the delegate.
Also check out the Instagram documentation: http://instagram.com/developer/iphone-hooks/
When triggered, Instagram will immediately present the user with our
filter screen. The image is preloaded and sized appropriately for
Instagram. Other than using the appropriate image format, described
above, our only requirement is that the image is at least 612px tall
and/or wide. For best results, Instagram prefers opening a JPEG that
is 612px by 612px square. If the image is larger, it will be resized
dynamically.
To verify that Instagram is installed check for the URL instagram://app. The URL instagram://location?id=LOCATION_ID is intended for location feeds only!
Related
I have a UITableView which displays fetched RSS dynamically, I have now customized the RSS to return the image name so that i can later on add a UIImageView to to every cell in the table which displays the image beside every cell, here is the code for adding the image
UIImageView *imageView = [[UIImageView alloc] init];
imageView.frame = CGRectMake(0, 0, 40, 40);
NSString *path = [NSString stringWithFormat:#"URL/%#",object.imageName]; //"object" is the returned Object from the RSS, so basically what i am doing is appending the image name to the path url.
NSURL *url = [NSURL URLWithString:path];
NSData *data = [NSData dataWithContentsOfURL:url];
imageView.image = [UIImage imageWithData:data];
[cell addSubview:imageView];
[cell bringSubviewToFront:imageView];
so when i run my app the app runs slowly and even stops for a small amount of time, the reason for that is that i am loading all RSS imaged directly in this line NSData *data = [NSData dataWithContentsOfURL:url];
any solution for this problem ?
Thank you in advance
i actually thought of fetching the images in a separate thread,
dispatch_queue_t fetchImage = dispatch_queue_create("Fetching Image", NULL);
dispatch_async(fetchImage, ^{
NSData *data = [NSData dataWithContentsOfURL:url];
});
dispatch_release(fetchImage);
but doing so wont allow me to use the variable "data" outside the queue.
any idea ?
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSString *path = [NSString stringWithFormat:#"URL/%#",object.imageName];
NSURL *url = [NSURL URLWithString:path];
NSData *data = [NSData dataWithContentsOfURL:url];
dispatch_async(dispatch_get_main_queue(), ^{
imageView.image = [UIImage imageWithData:data];
}); });
The method [NSData dataWithContentsOfURL:] is synchronous: whenever you call it, it blocks the current thread (which is almost certainly your app's main thread) for as long as it takes to complete. This is very bad. Aside from making the UI feel janky, there's a watchdog process that will kill unresponsive apps.
You really, really want to use asynchronous network calls. Read up on NSURLConnection, but know, also, that there are many articles and libraries and samples out there on this exact subject: loading images asynchronously for display in a table view. Start with, maybe, AFNetworking's category on UIImageView, or maybe a library like SDWebImage.
You should retrieve your data asynchronously ! May be the use of a Open Source libraries will help you:
AFNetworking
ASIHTTPRequest - not recommended
Or you can also use the NSURLConnection class with the asynchronous mode.
After implementing the HCDownload for iOS into my app I am successfully able to display the downloading progress of a file.
The problem is that the guy who wrote it, didn't use Xcode to write the module, so even though it should, it does not really work nice when trying to integrate with a project.
These are the main issues I have with it:
If you do a [self.navigationController pushViewController:dlvc animated:YES]; or a [self presentViewController: animated: completion:]; then it shows when it is initiated. I can get out of it, by navigating back, but then when I return to it, it is blank - so I cannot see what the progress is of the download. The download however keeps going, because it appears in my documents folder. ( I use ASIHTTP framework)
Now I am working with storyboard in this project, and because this does not come with a XIB file I thought (which has kinda worked in the past) I could just have a UITableViewController and have this as its Custom Class, but it does not play ball.
Is there a XIB based Download manager FrameWork that someone can point me too, or has anyone had luck with this one?
PS I know Storyboards do not use XIB files, but that way it is easier to integrate into storyboard than no UI files at all:-)
Kind thanks for the tips.
Edit
Here is the code where I implement it:
HCDownloadViewController *dlvc = [[HCDownloadViewController alloc] init];
dlvc.delegate = self;
NSString *documentDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
dlvc.downloadDirectory = documentDirectory;
NSString *fileSave = [_streamingURL lastPathComponent];
NSURL *url = [NSURL URLWithString:_streamingURL];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[dlvc downloadURL:url userInfo:nil];
// Add your filename to the directory to create your saved pdf location
NSString *pdfLocation = [documentDirectory stringByAppendingPathComponent:fileSave];
NSString *cachesDirectory = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
// Add your filename to the directory to create your temp pdf location
NSString *tempPdfLocation = [cachesDirectory stringByAppendingPathComponent:fileSave];
if (!networkQueue) {
networkQueue = [[ASINetworkQueue alloc] init];
}
failed = NO;
[request setTemporaryFileDownloadPath:tempPdfLocation];
[request setDownloadDestinationPath:pdfLocation];
[request setDownloadProgressDelegate:progressBar];
[request setShowAccurateProgress:YES];
I have two methods, first checks if I've already downloaded the image, and if not retrieves the image from a URL and caches it to my docs directory in my app. If it has been, it simply retrieves it, and if I have a internet connection, will re-download it. Here are the two methods:
- (UIImage *) getImageFromUserIMagesFolderInDocsWithName:(NSString *)nameOfFile
{
UIImage *image = [UIImage imageNamed:nameOfFile];
if (!image) // image doesn't exist in bundle...
{
// Get Image
NSString *cleanNameOfFile = [[[nameOfFile stringByReplacingOccurrencesOfString:#"." withString:#""]
stringByReplacingOccurrencesOfString:#":" withString:#""]
stringByReplacingOccurrencesOfString:#"/" withString:#""];
NSString *filePath = [NSHomeDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:#"Documents/%#.png", cleanNameOfFile]];
image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfFile:filePath]];
if (!image)
{
// image isn't cached
image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:nameOfFile]]];
[self saveImageToUserImagesFolderInDocsWithName:cleanNameOfFile andImage:image];
}
else
{
// if we have a internet connection, update the cached image
/*if (isConnectedToInternet) {
image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:nameOfFile]]];
[self saveImageToUserImagesFolderInDocsWithName:cleanNameOfFile andImage:image];
}*/
// otherwise just return it
}
}
return image;
}
Here's to save the image
- (void) saveImageToUserImagesFolderInDocsWithName:(NSString *)nameOfFile andImage:(UIImage *)image
{
NSString *pngPath = [NSHomeDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:#"Documents/%#.png", nameOfFile]];
[UIImagePNGRepresentation(image) writeToFile:pngPath atomically:YES];
NSLog(#"directory: %#", [[UIImage alloc] initWithContentsOfFile:pngPath]);
}
The image has already been successfully downloaded and cached to my documents directory (I know because I can see it in the File system). And it successfully re loads the image the first time I call this method, but once I go to another view, and re-call this method when I come back to the same view, it's blank. Yet, the URL is correct. What's wrong here?
1) You should not be writing into a hardcoded path as you do (ie "Documents/xxx"), but rather ask for the Application Support directory, use it, and also mark files so that they don't get uploaded to iCloud (unless you want that). See this link on the specifics. Create a subfolder in it and mark it as not for iCloud backup.
2) Try changing:
image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:nameOfFile]]];
to
image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:filePath]]];
Maybe, you should do:
image = [UIImage imageWithContentsOfFile: nameOfFile];
I'm using ShareKit to share objects to Twitter, Facebook, and Email. Twitter and Facebook works fine, but email doesn't. And I don't really know why.
It seems like it works quite randomly.
I set it up like this:
[self.customView.shareButton addTarget:self action:#selector(sharePost:) forControlEvents:UIControlEventTouchUpInside];
- (void)sharePost:(UIButton *)sender
{
NSURL *url = [NSURL URLWithString:self.currentPost.link];
// Add image.
NSString *imageUrlString = [NSString stringWithFormat:[link]];
NSURL *imageUrl = [NSURL URLWithString:imageUrlString];
UIImageView *postImage = [[UIImageView alloc] init];
[postImage setImageWithURL:imageUrl];
SHKItem *item = [SHKItem image:postImage.image title:[NSString stringWithFormat:#"%#", self.currentPost.title]];
[item setURL:url];
[item setMailBody:[NSString stringWithFormat:#"%# %#", self.currentPost.title, self.currentPost.link]];
// Get the ShareKit action sheet
// This works
SHKActionSheet *actionSheet = [SHKActionSheet actionSheetForItem:item];
// ShareKit detects top view controller (the one intended to present ShareKit UI) automatically,
// but sometimes it may not find one. To be safe, set it explicitly.
[SHK setRootViewController:self];
// Display the action sheet.
[actionSheet showInView:self.view];
}
Any ideas or what I'm missing or doing wrong?
Try to change the RootViewController and view you are using:
[SHK setRootViewController:self.view.window.rootViewController];
[actionSheet showInView:self.view.window.rootViewController.view];
Most likely your view controller hierarchy is somewhat messed up.
fairly new to Objective-C and iOS development (coming from PHP) and I have a relatively simple question that I can't seem to find an answer to:
I am following along with an example for split View design where a web page is loaded into the Detail View when a user clicks an item in the master view. I got all this working, but would like to substitute web view for an image. So I've amended the app to load a UIImage instead of a WebView. What I'm looking for is the equivalent to this code:
NSString *urlString = [pagesAddress objectAtIndex:indexPath.row];
NSURL *url = [NSURL URLWithString:urlString];
// these 2 is where I get lost with the images.
NSURLRequest = *request = [NSURLRequest requestWithURL:url];
[detailViewController.webView loadRequest:request];
I came up with this:
NSString *imageName = [pagesAddress objectAtIndex:indexPath.row];
UIImage *myImage = [UIImage imageNamed:imageName];
// missing the last 2 calls: one to tell Xcode that it's an image "request" I want and the second to load the actual image (based on it's name that is already in an array) into the ImageView.
Thanks.
PS
I tried this:
NSString *imageName = [pagesAddress objectAtIndex:indexPath .row];
[detailViewController.imageView setImage:[UIImage imageNamed:imageName]];
And it shows just the first image, then crashes when I try to show the last one.
In the end, the solution were those 2 lines when I amended the code:
NSString *imageName = [pagesAddress objectAtIndex:indexPath.row];
[detailViewController.imageView setImage:[UIImage imageNamed:imageName]];
Notice that I had to change the setImage to convert the NSString to a UIImage or Xcode would complain. It turns out it was crashing because in the array where I had the image names, I had put 3 images into one entry (basically I forgot the commas!) so it was out of range.
Tim:
This line you gave me
UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];
is unnecessary because I already have a view created, it would create another view which I never used. Also, replacing it with CGRect seems overkill if I already have a UIImage placeholder no?
In any case, it works now and I'm very grateful for all the help. iPad development with Objectve-C is a very thorny road and I expect I'll be bugging you guys some more.
Cheers.
Try this:
UIImage *myImage = [[UIImage alloc] initWithData:[NSData dataWithConentsOfURL:[NSURL URLWithString:urlString];
// don't know if you already got the following?
UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];
[imageView setImage:myImage];
[self.view addSubview:imageView];
The first line is synchronous (= blocking), so in production, you should rather use - [NSURLRequest start] for this (but that's a bit more complicated).
Or use this for your local images:
UIImage *myImage = [UIImage imageNamed:imageName];
// Now, follow the same steps as in the first code-example, just skip the first line.
Try this (on iOS 4.0 and later):
// Execute a block of code on a background thread.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
^(void)
{
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
UIImage* image = [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];
// When IO is done and image created, set it on the main thread.
dispatch_async(dispatch_get_main_queue(),
^(void)
{
imageView.image = image;
});
[pool release];
});