iOS QR code generation and scanning code
Now more and more applications are joining QR code-related businesses. In the iOS development market, many developers are using third-party scan codes and controlling QR codes. I personally think that such third-party controls are not highly recognizable. I happened to sort out the new framework recently and studied it. The specific code is as follows
Generate QR code
/**
* @author Half full, 15-12-18
*
* @brief Generate QR code picture
*
* @param code generates QR code image content
* @param width QR code picture width
* @param height QR code image height
*
* @return Return UIImage object
*/
- (UIImage *)generateQRCode:(NSString *)code width:(CGFloat)width height:(CGFloat)height {
CIImage *qrcodeImage;
NSData *data = [code dataUsingEncoding:NSISOLatin1StringEncoding allowLossyConversion:false];
CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
[filter setValue:data forKey:@"inputMessage"];
[filter setValue:@"H" forKey:@"inputCorrectionLevel"];
qrcodeImage = [filter outputImage];
CGFloat scaleX = width / ;
CGFloat scaleY = height / ;
CIImage *transformedImage = [qrcodeImage imageByApplyingTransform:CGAffineTransformScale(CGAffineTransformIdentity, scaleX, scaleY)];
return [UIImage imageWithCIImage:transformedImage];
}
Scan the QR code code
#import <AVFoundation/>
static const float lightWidth = ;
static const float lightHeight = ;
static const float crossLineWidth = ;
static const float crossLineHeight = ;
@interface BBScanCodeViewController ()<AVCaptureMetadataOutputObjectsDelegate> {
float leftWith;
float topHeight;
}
@property (strong , nonatomic ) AVCaptureDevice *captureDevice;
@property (strong , nonatomic ) AVCaptureDeviceInput *captureInput;
@property (strong , nonatomic ) AVCaptureMetadataOutput *captureOutput;
@property (strong , nonatomic ) AVCaptureSession *captureSession;
@property (strong , nonatomic ) AVCaptureVideoPreviewLayer *capturePreview;
@property (strong,nonatomic) UIButton *flashLightBtn;
@property (strong,nonatomic) UIImageView *lineImageView;
@end
@implementation BBScanCodeViewController
@synthesize captureDevice = _captureDevice;
@synthesize captureInput = _captureInput;
@synthesize captureOutput = _captureOutput;
@synthesize capturePreview = _capturePreview;
@synthesize captureSession = _captureSession;
@synthesize delegate = _delegate;
@synthesize isRectScan = _isRectScan;
@synthesize lineImageView = _lineImageView;
@synthesize flashLightBtn = _flashLightBtn;
- (void)viewDidLoad {
[super viewDidLoad];
= YES;
CGRect screenRect = [UIScreen mainScreen].bounds;
leftWith = ( - lightWidth) / 2;
topHeight =( - lightHeight) / 2;
#if !TARGET_IPHONE_SIMULATOR
[self initScanCode];
#endif
[self initLayer];
[self initViewControl];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willResignActiveNotification) name:UIApplicationWillResignActiveNotification object:nil]; // Listen to whether the home key hanging program is triggered. [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didBecomeActiveNotification) name:UIApplicationDidBecomeActiveNotification object:nil]; // Listen to whether to re-enter the program.}
-(void)viewWillDisappear:(BOOL)animated {
[self stopScanCode];
[super viewWillDisappear:animated];
}
- (void)willResignActiveNotification {
_flashLightBtn.selected = NO;
}
- (void)didBecomeActiveNotification {
}
//Loading controls on the interface, such as: plus flash buttons, etc.- (void)initViewControl {
@autoreleasepool {
_flashLightBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[_flashLightBtn setImage:[UIImage imageNamed:@""] forState:UIControlStateNormal];
[_flashLightBtn setImage:[UIImage imageNamed:@""] forState:UIControlStateSelected];
_flashLightBtn.frame = CGRectMake(leftWith, , , );
[_flashLightBtn addTarget:self action:@selector(systemFlashLight) forControlEvents:UIControlEventTouchUpInside];
[ addSubview:_flashLightBtn];
_lineImageView = [[UIImageView alloc] initWithImage:nil];
_lineImageView.backgroundColor = [UIColor greenColor];
_lineImageView.frame = CGRectMake(leftWith, topHeight, lightWidth, 2);
[ addSubview:_lineImageView];
[self scanLineAnimation];
}
}
- (void)scanLineAnimation {
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:];
//Set the proxy [UIView setAnimationDelegate:self];
//Set the event of the animation execution and call [UIView setAnimationDidStopSelector:@selector(didViewAnimation)];
_lineImageView.frame = CGRectMake(leftWith,topHeight + lightHeight-2,lightWidth,2);
[UIView commitAnimations];
}
-(void)didViewAnimation {
//
_lineImageView.frame = CGRectMake(leftWith, topHeight, lightWidth, 2);
[self scanLineAnimation];
}
- (void)insertLayerWithFrame:(CGRect)frame withBackgroundColor:(UIColor *)backgroundColor {
@autoreleasepool {
CALayer *layer = [CALayer layer];
= ;
= frame;
[ addSublayer:layer];
}
}
//Initialize the layer layer and draw the translucent area-(void) initLayer {
//Public parameters UIColor *fillColor = [UIColor colorWithRed:0xae/ green:0xae/ blue:0xae/ alpha:0.4];
UIColor *crossColor = [UIColor greenColor];
CGRect screenRect = [UIScreen mainScreen].bounds;
[self insertLayerWithFrame:CGRectMake(0, 0, leftWith, ) withBackgroundColor:fillColor];
[self insertLayerWithFrame:CGRectMake(leftWith, 0, lightWidth, topHeight) withBackgroundColor:fillColor];
[self insertLayerWithFrame:CGRectMake(leftWith + lightWidth, 0, leftWith, ) withBackgroundColor:fillColor];
[self insertLayerWithFrame:CGRectMake(leftWith, topHeight + lightHeight, lightWidth, topHeight) withBackgroundColor:fillColor];
[self insertLayerWithFrame:CGRectMake(leftWith, topHeight, crossLineWidth, crossLineHeight) withBackgroundColor:crossColor];
[self insertLayerWithFrame:CGRectMake(leftWith, topHeight, crossLineHeight, crossLineWidth) withBackgroundColor:crossColor];
[self insertLayerWithFrame:CGRectMake(leftWith + lightWidth - crossLineHeight, topHeight, crossLineHeight, crossLineWidth) withBackgroundColor:crossColor];
[self insertLayerWithFrame:CGRectMake(leftWith + lightWidth - crossLineWidth, topHeight, crossLineWidth, crossLineHeight) withBackgroundColor:crossColor];
[self insertLayerWithFrame:CGRectMake(leftWith, topHeight + lightHeight - crossLineHeight, crossLineWidth, crossLineHeight) withBackgroundColor:crossColor];
[self insertLayerWithFrame:CGRectMake(leftWith, topHeight + lightHeight - crossLineWidth, crossLineHeight, crossLineWidth) withBackgroundColor:crossColor];
[self insertLayerWithFrame:CGRectMake(leftWith + lightWidth - crossLineHeight, topHeight + lightHeight - crossLineWidth, crossLineHeight, crossLineWidth) withBackgroundColor:crossColor];
[self insertLayerWithFrame:CGRectMake(leftWith + lightWidth - crossLineWidth, topHeight + lightHeight - crossLineHeight, crossLineWidth, crossLineHeight) withBackgroundColor:crossColor];
}
-(void)initScanCode {
@autoreleasepool {
_captureDevice = [ AVCaptureDevice defaultDeviceWithMediaType : AVMediaTypeVideo];
_captureInput = [ AVCaptureDeviceInput deviceInputWithDevice : _captureDevice error : nil ];
_captureOutput = [[ AVCaptureMetadataOutput alloc ] init ];
[_captureOutput setMetadataObjectsDelegate : self queue : dispatch_get_main_queue ()];
if (_isRectScan) {
CGRect screenRect = [UIScreen mainScreen].bounds;
[ _captureOutput setRectOfInterest : CGRectMake (topHeight / , leftWith / , lightHeight/, lightWidth / )];
}
_captureSession = [[ AVCaptureSession alloc ] init ];
[_captureSession setSessionPreset : AVCaptureSessionPresetHigh ];
if ([_captureSession canAddInput : _captureInput ])
{
[_captureSession addInput : _captureInput ];
}
if ([_captureSession canAddOutput : _captureOutput ])
{
[_captureSession addOutput : _captureOutput ];
}
_captureOutput.metadataObjectTypes = @[AVMetadataObjectTypeQRCode ] ;
_capturePreview =[ AVCaptureVideoPreviewLayer layerWithSession :_captureSession ];
_capturePreview.videoGravity = AVLayerVideoGravityResizeAspectFill ;
_capturePreview.frame = ;
[ insertSublayer : _capturePreview atIndex : 0 ];
[_captureSession startRunning ];
}
}
- ( void )captureOutput:( AVCaptureOutput *)captureOutput didOutputMetadataObjects:( NSArray *)metadataObjects fromConnection:( AVCaptureConnection *)connection
{
if (metadataObjects != nil && [metadataObjects count] > 0) {
AVMetadataMachineReadableCodeObject *metadataObj = [metadataObjects objectAtIndex:0];
NSString *scanCodeResult;
if ([[metadataObj type] isEqualToString:AVMetadataObjectTypeQRCode]) {
[self stopScanCode];
scanCodeResult = ;
//Callback information if (_delegate && [_delegate respondsToSelector:@selector(scanCodeResultByViewController:withScanCodeResult:)]) {
[_delegate scanCodeResultByViewController:self withScanCodeResult:scanCodeResult];
[ popViewControllerAnimated:YES];
}
} else {
NSLog(@"Error in scan information!");
}
}
}
- (void)systemFlashLight
{
#if !TARGET_IPHONE_SIMULATOR
if([_captureDevice hasTorch] && [ hasFlash])
{
[_captureSession beginConfiguration];
[_captureDevice lockForConfiguration:nil];
if(_captureDevice.torchMode == AVCaptureTorchModeOff)
{
_flashLightBtn.selected = YES;
[_captureDevice setTorchMode:AVCaptureTorchModeOn];
[_captureDevice setFlashMode:AVCaptureFlashModeOn];
}
else {
_flashLightBtn.selected = NO;
[_captureDevice setTorchMode:AVCaptureTorchModeOff];
[_captureDevice setFlashMode:AVCaptureFlashModeOff];
}
[_captureDevice unlockForConfiguration];
[_captureSession commitConfiguration];
}
#else
[CommonUtil showAlert:G_ALERTTITLE withMessage:@"The virtual device cannot run the camera!"];
#endif
}
-(void)stopScanCode {
[_captureSession stopRunning];
_captureSession = nil;
_captureDevice = nil;
_captureInput = nil;
_captureOutput = nil;
[_capturePreview removeFromSuperlayer];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
@end
Thank you for reading, I hope it can help you. Thank you for your support for this site!