iOS 8.1 with ZXING error ARC forbids explicit message send of 'autorelease' - ios

Question

I developed a DataMatrix Reader for Android with ZXING, and works fine, now I'm working in the version of iOS, but I have this errors when I want to use the library inside my project:
iOS SDK 8.1 and Library
ZXING: https://github.com/TheLevelUp/ZXingObjC
I use the COCOAPODS:
platform :ios, '7.0'
pod 'ZXingObjC', '~> 3.0'
I implemented the library in my project with Cocoapods, now I want to use in my App like this:
#import "ViewController.h"
#import "ZXingObjC.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)scanBarcode:(id)sender {
CGImageRef imageToDecode; // Given a CGImage in which we are looking for barcodes
ZXLuminanceSource *source = [[[ZXCGImageLuminanceSource alloc] initWithCGImage:imageToDecode] autorelease];
ZXBinaryBitmap *bitmap = [ZXBinaryBitmap binaryBitmapWithBinarizer:[ZXHybridBinarizer binarizerWithSource:source]];
NSError *error = nil;
// There are a number of hints we can give to the reader, including
// possible formats, allowed lengths, and the string encoding.
ZXDecodeHints *hints = [ZXDecodeHints hints];
ZXMultiFormatReader *reader = [ZXMultiFormatReader reader];
ZXResult *result = [reader decode:bitmap
hints:hints
error:&error];
if (result) {
// The coded result as a string. The raw data can be accessed with
// result.rawBytes and result.length.
NSString *contents = result.text;
// The barcode format, such as a QR code or UPC-A
ZXBarcodeFormat format = result.barcodeFormat;
} else {
// Use error to determine why we didn't get a result, such as a barcode
// not being found, an invalid checksum, or a format inconsistency.
}
}
#end
but I have this error:
DataMatrixReader/ViewController.m:32:99: ARC forbids explicit message
send of 'autorelease'
DataMatrixReader/ViewController.m:32:99: 'autorelease' is unavailable:
not available in automatic reference counting mode
concretly in this line:
ZXLuminanceSource *source = [[[ZXCGImageLuminanceSource alloc]
initWithCGImage:imageToDecode] autorelease];
Help from "iamnichols"...and after the change the line:
ZXLuminanceSource *source = [[[ZXCGImageLuminanceSource alloc]
initWithCGImage:imageToDecode] autorelease];
to
ZXLuminanceSource *source = [[ZXCGImageLuminanceSource alloc]
initWithCGImage:imageToDecode];
Error:
: CGBitmapContextGetData: invalid context 0x0. This is a
serious error. This application, or a library it uses, is using an
invalid context and is thereby contributing to an overall degradation
of system stability and reliability. This notice is a courtesy: please
fix this problem. It will become a fatal error in an upcoming update.
2014-12-15 12:12:36.122 DataMatrixReader[18838:412778] * Terminating
app due to uncaught exception 'NSInvalidArgumentException', reason:
'Both dimensions must be greater than 0'
* First throw call stack: ( 0 CoreFoundation 0x0000000102626f35 exceptionPreprocess + 165 1 libobjc.A.dylib
0x00000001022bfbb7 objc_exception_throw + 45 2 DataMatrixReader
0x0000000100f09507 -[ZXBitMatrix initWithWidth:height:] + 231 3
DataMatrixReader 0x0000000100f51b7d
-[ZXGlobalHistogramBinarizer blackMatrixWithError:] + 141 4 DataMatrixReader 0x0000000100f530b0
-[ZXHybridBinarizer blackMatrixWithError:] + 816 5 DataMatrixReader 0x0000000100f068ab -[ZXBinaryBitmap blackMatrixWithError:] + 139 6
DataMatrixReader 0x0000000100fa43b2
-[ZXQRCodeReader decode:hints:error:] + 130 7 DataMatrixReader 0x0000000100f63d04 -[ZXMultiFormatReader decodeInternal:error:] + 548
8 DataMatrixReader 0x0000000100f62ade
-[ZXMultiFormatReader decode:hints:error:] + 142 9 DataMatrixReader 0x0000000100ef1df2 -[ViewController scanBarcode:] + 322 10 UIKit
0x0000000102a148be -[UIApplication sendAction:to:from:forEvent:] + 75
11 UIKit 0x0000000102b1b410
-[UIControl _sendActionsForEvents:withEvent:] + 467 12 UIKit 0x0000000102b1a7df -[UIControl touchesEnded:withEvent:] + 522 13
UIKit 0x0000000102a5a308 -[UIWindow
_sendTouchesForEvent:] + 735 14 UIKit 0x0000000102a5ac33 -[UIWindow sendEvent:] + 683 15 UIKit
0x0000000102a279b1 -[UIApplication sendEvent:] + 246 16 UIKit
0x0000000102a34a7d _UIApplicationHandleEventFromQueueEvent + 17370 17
UIKit 0x0000000102a10103
_UIApplicationHandleEventQueue + 1961 18 CoreFoundation 0x000000010255c551
__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 19 CoreFoundation 0x000000010255241d
__CFRunLoopDoSources0 + 269 20 CoreFoundation 0x0000000102551a54 __CFRunLoopRun + 868 21 CoreFoundation
0x0000000102551486 CFRunLoopRunSpecific + 470 22 GraphicsServices
0x0000000104bc09f0 GSEventRunModal + 161 23 UIKit
0x0000000102a13420 UIApplicationMain + 1282 24 DataMatrixReader
0x0000000100ef2343 main + 115 25 libdyld.dylib
0x00000001058a3145 start + 1 ) libc++abi.dylib: terminating with
uncaught exception of type NSException (lldb)
Now the question is somebody tried to integrate the ZxingObjC in iOS 8.1?

Answer 1

I think your project is using ARC but ZXING library isn't. In that case go to path 'Target -> Build Phases -> Compile Sources' in ZXING library. Double click on each .m file and enter '-fno-objc-arc' in popped dialog box. In this way those files will be excluded from ARC

Answer 2

If you project is using ARC (Automatic Reference Counting) then you don't need to make autorelease calls as it is done for you.
Change
ZXLuminanceSource *source = [[[ZXCGImageLuminanceSource alloc] initWithCGImage:imageToDecode] autorelease];
to
ZXLuminanceSource *source = [[ZXCGImageLuminanceSource alloc] initWithCGImage:imageToDecode];
Further information about ARC can be found on the iOS Developer Library

Answer 3

This works perfectly for me:
Getting Started in the readme.md didn’t work so I had to do the following steps to make it work.
copy the whole folders into your working project’s sub-folder.
and drag/add ZXingObjC.xcodeproj file to “<your working project>”.
make sure tick create folder references for any added folders option when prompted.
then, go to your project’s Target > Build Phases
under Target Dependencies, add ZXingObjC-iOS (ZXingObjC)
under Link Binary With Libraries, add libZXingObjC-iOS.a
under the same category, add the following 6 frameworks
AVFoundation.framework
CoreGraphics.framework
CoreMedia.framework
CoreVideo.framework
ImageIO.framework
QuartzCore.framework
Source in: http://sagage.com/?p=55
My test in a direct device Iphone 4s were good, perhaps is not the best device to test that, Iphone 4s has not a "AutoFocus" feature, very important for work with this barcodes.
hope this saves your day.