I used ios7 API to scan QRcode , code as bellow:
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
[self.captureSession addOutput:output];
[output setMetadataObjectsDelegate:self queue:captureOutputBufferQueue];
output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];
I got crashes info from Crashlytics:
NSInvalidArgumentException
*** -[AVCaptureMetadataOutput setMetadataObjectTypes:] - unsupported type found. Use - availableMetadataObjectTypes.
Thread : Fatal Exception: NSInvalidArgumentException
0 CoreFoundation 0x303b9f83 __exceptionPreprocess + 130
1 libobjc.A.dylib 0x3ab6accf objc_exception_throw + 38
2 AVFoundation 0x2f2f7c29 -[AVCaptureMetadataOutput rectOfInterest]
anyone had met this?
You must add the output to session before set the metadataObjectTypes. I meet the error, and use the following code fix it.
@property (nonatomic, strong) AVCaptureMetadataOutput *output;
@property (nonatomic, strong) AVCaptureSession *session;
- (AVCaptureMetadataOutput *)output
{
if (!_output) {
_output = [[AVCaptureMetadataOutput alloc] init];
[_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
}
return _output;
}
- (AVCaptureSession *)session
{
if (!_session) {
_session = [[AVCaptureSession alloc] init];
[_session setSessionPreset:AVCaptureSessionPresetHigh];
if ([_session canAddInput:self.input]) {
[_session addInput:self.input];
}
if ([_session canAddOutput:self.output]) {
[_session addOutput:self.output];
NSArray *typeList = self.output.availableMetadataObjectTypes;
NSLog(@"availableMetadataObjectTypes : %@", typeList);
self.output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];
}
}
return _session;
}
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