Present UIImagePickerController cause my app crash under iOS6.1

Question

Code is below and crash at [self presentModalViewController:imagePicker animated:YES]; when I use device under iOS6.1. It work fine in iOS 7.

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum]) {
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init] ;
    imagePicker.delegate = self;
    imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    [self presentModalViewController:imagePicker animated:YES];
}

Get the error in console: ImageIO: PNG invalid PNG file: iDOT doesn't point to valid IDAT chunk

Any suggestion is appreciated.

Answer 1

Ok, I have fixed the bug, I want to share it out with detail process.

When it crashes, it shows ImageIO: PNG invalid PNG file: iDOT doesn't point to valid IDAT chunk libc++abi.dylib: handler threw exception in the console, I have no idea about "ImageIO balabala..." but I think I may catch the exception when I noticed "libc++abi.dylib: handler threw exception". So I add @try @catch in my code, code is below.

@try {
   [self presentModalViewController:imagePicker animated:YES] ;
}
@catch (NSException *exception) {
    NSLog(@"exception:%@", exception) ;
}
@finally {
}

Then I run it again, I got exception:preferredInterfaceOrientationForPresentation must return a supported interface orientation!.

The problem seems to be a little obvious, after google it, I find a solution which is to override some orientation related methods to provide a preferred interface orientation in UIImagePickerController.

So I subclass the UIImagePickerController and implement some methods like this below:

-(BOOL)shouldAutorotate
{
    return NO;
}

-(NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskAll;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return UIInterfaceOrientationPortrait;
}

Then run again, no crash , cheers !!!

Answer 2

Replace this line:

[self presentModalViewController:imagePicker animated:YES];

With

[self presentViewController:picker animated:YES completion:nil];