when call imageAtIndex
sometimes crash like this
Thread 3 Crashed:
0 libobjc.A.dylib _objc_msgSend +32
1 ImageIO ERROR_CGImageCopyImageSource_WAS_CALLED_WITH_INVALID_CGIMAGE(CGImage*) +56
2 ImageIO _CGImageGetImageSource +108
3 UIKitCore -[_UIImageCGImageContent initWithCGImage:scale:] +40
4 UIKitCore -[UIImage initWithCGImage:scale:orientation:] +76
5 UIKitCore +[UIImage imageWithCGImage:] +48
when call imageAtIndex
sometimes crash like this
Thread 3 Crashed:0 libobjc.A.dylib _objc_msgSend +321 ImageIO ERROR_CGImageCopyImageSource_WAS_CALLED_WITH_INVALID_CGIMAGE(CGImage*) +562 ImageIO _CGImageGetImageSource +1083 UIKitCore -[_UIImageCGImageContent initWithCGImage:scale:] +404 UIKitCore -[UIImage initWithCGImage:scale:orientation:] +765 UIKitCore +[UIImage imageWithCGImage:] +48