Post Photo Facebook iOS - ios

Question

I'm trying to upload a photo to Facebook. I read a lot of tutorials and examples and still can't get it to work. Many times I get an EXC_BAD_ACCESS in this line:
[_facebook requestWithGraphPath:#"me/photos"
andParams:photosParams
andHttpMethod:#"POST"
andDelegate:self];
Other times nothing appears. I want the user to login only when they click on "share image" in Facebook. Thats why I didn't put the delegate in the appDelegate. Below is my code:
if (_facebook != nil) {
[self fbDidLogin];
}
_publishedImage = img;
_facebook = [[Facebook alloc] initWithAppId:#"235694579858240" andDelegate:self];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if ([defaults objectForKey:#"FBAccessTokenKey"]
&& [defaults objectForKey:#"FBExpirationDateKey"])
{
_facebook.accessToken = [defaults objectForKey:#"FBAccessTokenKey"];
_facebook.expirationDate = [defaults objectForKey:#"FBExpirationDateKey"];
}
if (![_facebook isSessionValid])
{
NSArray* permissions = [[NSArray alloc] initWithObjects:
#"offline_access", #"publish_stream", #"publish_actions", #"photo_upload", nil];
[_facebook authorize:permissions];
}
UIImage *imgSource = img;
NSString *strMessage = #"This is the photo caption";
NSMutableDictionary* photosParams = [NSMutableDictionary dictionaryWithObjectsAndKeys:
imgSource,#"source",
strMessage,#"message",
nil];
[_facebook requestWithGraphPath:#"me/photos"
andParams:photosParams
andHttpMethod:#"POST"
andDelegate:self];
My ViewController has these delegates:
<UIImagePickerControllerDelegate, UIActionSheetDelegate, UIGestureRecognizerDelegate, MFMailComposeViewControllerDelegate, FBSessionDelegate, FBDialogDelegate, FBRequestDelegate>
Edit: Are there any plugins to share photos easily in Facebook, G+, and everything else easily?

Answer 1

Instead of using the graph why don't you try:
if ([fbAppDelegate.facebook isSessionValid]) {
NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys: #"http://hd.ipad-wallpapers.fr/thumbs/wooden_apple_logo_4-t1.jpg // but could also use UIImage", #"picture", nil]; // you don't
[fbAppDelegate.facebook dialog:#"feed" andParams:params andDelegate:self];
}
// this is what I do .....