iOS 二维码生成及扫码详解及实例代码
iOS二维码生成及扫码
现在越来越多的应用加入二维码相关的业务，在iOS开发市场上很多开发人员都在使用第三方的扫码与生成二维码的控件，个人认为此类的第三方控件识别度不高。最近正好整理新框架的事情，研究了一下。具体代码如下
生成二维码代码
/**
*@author半饱,15-12-18
*
*@brief生成二维码图片
*
*@paramcode生成二维码图片内容
*@paramwidth二维码图片宽度
*@paramheight二维码图片高度
*
*@return返回UIImage对象
*/
-(UIImage*)generateQRCode:(NSString*)codewidth:(CGFloat)widthheight:(CGFloat)height{
CIImage*qrcodeImage;
NSData*data=[codedataUsingEncoding:NSISOLatin1StringEncodingallowLossyConversion:false];
CIFilter*filter=[CIFilterfilterWithName:@"CIQRCodeGenerator"];
[filtersetValue:dataforKey:@"inputMessage"];
[filtersetValue:@"H"forKey:@"inputCorrectionLevel"];
qrcodeImage=[filteroutputImage];
CGFloatscaleX=width/qrcodeImage.extent.size.width;
CGFloatscaleY=height/qrcodeImage.extent.size.height;
CIImage*transformedImage=[qrcodeImageimageByApplyingTransform:CGAffineTransformScale(CGAffineTransformIdentity,scaleX,scaleY)];
return[UIImageimageWithCIImage:transformedImage];
}
扫描二维码代码
#import<AVFoundation/AVFoundation.h>
staticconstfloatlightWidth=240.f;
staticconstfloatlightHeight=240.f;
staticconstfloatcrossLineWidth=2.f;
staticconstfloatcrossLineHeight=15.f;
@interfaceBBScanCodeViewController()<AVCaptureMetadataOutputObjectsDelegate>{
floatleftWith;
floattopHeight;
}
@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
@implementationBBScanCodeViewController
@synthesizecaptureDevice=_captureDevice;
@synthesizecaptureInput=_captureInput;
@synthesizecaptureOutput=_captureOutput;
@synthesizecapturePreview=_capturePreview;
@synthesizecaptureSession=_captureSession;
@synthesizedelegate=_delegate;
@synthesizeisRectScan=_isRectScan;
@synthesizelineImageView=_lineImageView;
@synthesizeflashLightBtn=_flashLightBtn;
-(void)viewDidLoad{
[superviewDidLoad];
self.isShowNavigationItem=YES;
CGRectscreenRect=[UIScreenmainScreen].bounds;
leftWith=(screenRect.size.width-lightWidth)/2;
topHeight=(screenRect.size.height-lightHeight)/2;
#if!TARGET_IPHONE_SIMULATOR
[selfinitScanCode];
#endif
[selfinitLayer];
[selfinitViewControl];
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(willResignActiveNotification)name:UIApplicationWillResignActiveNotificationobject:nil];//监听是否触发home键挂起程序.
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(didBecomeActiveNotification)name:UIApplicationDidBecomeActiveNotificationobject:nil];//监听是否重新进入程序程序.
}
-(void)viewWillDisappear:(BOOL)animated{
[selfstopScanCode];
[superviewWillDisappear:animated];
}
-(void)willResignActiveNotification{
_flashLightBtn.selected=NO;
}
-(void)didBecomeActiveNotification{
}
//加载界面上的控件，如：加上闪光灯按钮等
-(void)initViewControl{
@autoreleasepool{
_flashLightBtn=[UIButtonbuttonWithType:UIButtonTypeCustom];
[_flashLightBtnsetImage:[UIImageimageNamed:@"OpenFlashLight.png"]forState:UIControlStateNormal];
[_flashLightBtnsetImage:[UIImageimageNamed:@"CloseFlashLight.png"]forState:UIControlStateSelected];
_flashLightBtn.frame=CGRectMake(leftWith,80.f,30.f,30.f);
[_flashLightBtnaddTarget:selfaction:@selector(systemFlashLight)forControlEvents:UIControlEventTouchUpInside];
[self.viewaddSubview:_flashLightBtn];
_lineImageView=[[UIImageViewalloc]initWithImage:nil];
_lineImageView.backgroundColor=[UIColorgreenColor];
_lineImageView.frame=CGRectMake(leftWith,topHeight,lightWidth,2);
[self.viewaddSubview:_lineImageView];
[selfscanLineAnimation];
}
}
-(void)scanLineAnimation{
[UIViewbeginAnimations:nilcontext:nil];
[UIViewsetAnimationDuration:4.f];
//设置代理
[UIViewsetAnimationDelegate:self];
//设置动画执行完毕调用的事件
[UIViewsetAnimationDidStopSelector:@selector(didViewAnimation)];
_lineImageView.frame=CGRectMake(leftWith,topHeight+lightHeight-2,lightWidth,2);
[UIViewcommitAnimations];
}
-(void)didViewAnimation{
//self.navigationController
_lineImageView.frame=CGRectMake(leftWith,topHeight,lightWidth,2);
[selfscanLineAnimation];
}
-(void)insertLayerWithFrame:(CGRect)framewithBackgroundColor:(UIColor*)backgroundColor{
@autoreleasepool{
CALayer*layer=[CALayerlayer];
layer.backgroundColor=backgroundColor.CGColor;
layer.frame=frame;
[self.view.layeraddSublayer:layer];
}
}
//初始化layer层，绘制半透明区域
-(void)initLayer{
//公共参数
UIColor*fillColor=[UIColorcolorWithRed:0xae/255.fgreen:0xae/255.fblue:0xae/255.falpha:0.4];
UIColor*crossColor=[UIColorgreenColor];
CGRectscreenRect=[UIScreenmainScreen].bounds;
[selfinsertLayerWithFrame:CGRectMake(0,0,leftWith,screenRect.size.height)withBackgroundColor:fillColor];
[selfinsertLayerWithFrame:CGRectMake(leftWith,0,lightWidth,topHeight)withBackgroundColor:fillColor];
[selfinsertLayerWithFrame:CGRectMake(leftWith+lightWidth,0,leftWith,screenRect.size.height)withBackgroundColor:fillColor];
[selfinsertLayerWithFrame:CGRectMake(leftWith,topHeight+lightHeight,lightWidth,topHeight)withBackgroundColor:fillColor];
[selfinsertLayerWithFrame:CGRectMake(leftWith,topHeight,crossLineWidth,crossLineHeight)withBackgroundColor:crossColor];
[selfinsertLayerWithFrame:CGRectMake(leftWith,topHeight,crossLineHeight,crossLineWidth)withBackgroundColor:crossColor];
[selfinsertLayerWithFrame:CGRectMake(leftWith+lightWidth-crossLineHeight,topHeight,crossLineHeight,crossLineWidth)withBackgroundColor:crossColor];
[selfinsertLayerWithFrame:CGRectMake(leftWith+lightWidth-crossLineWidth,topHeight,crossLineWidth,crossLineHeight)withBackgroundColor:crossColor];
[selfinsertLayerWithFrame:CGRectMake(leftWith,topHeight+lightHeight-crossLineHeight,crossLineWidth,crossLineHeight)withBackgroundColor:crossColor];
[selfinsertLayerWithFrame:CGRectMake(leftWith,topHeight+lightHeight-crossLineWidth,crossLineHeight,crossLineWidth)withBackgroundColor:crossColor];
[selfinsertLayerWithFrame:CGRectMake(leftWith+lightWidth-crossLineHeight,topHeight+lightHeight-crossLineWidth,crossLineHeight,crossLineWidth)withBackgroundColor:crossColor];
[selfinsertLayerWithFrame:CGRectMake(leftWith+lightWidth-crossLineWidth,topHeight+lightHeight-crossLineHeight,crossLineWidth,crossLineHeight)withBackgroundColor:crossColor];
}
-(void)initScanCode{
@autoreleasepool{
_captureDevice=[AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];
_captureInput=[AVCaptureDeviceInputdeviceInputWithDevice:_captureDeviceerror:nil];
_captureOutput=[[AVCaptureMetadataOutputalloc]init];
[_captureOutputsetMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()];
if(_isRectScan){
CGRectscreenRect=[UIScreenmainScreen].bounds;
[_captureOutputsetRectOfInterest:CGRectMake(topHeight/screenRect.size.height,leftWith/screenRect.size.width,lightHeight/screenRect.size.height,lightWidth/screenRect.size.width)];
}
_captureSession=[[AVCaptureSessionalloc]init];
[_captureSessionsetSessionPreset:AVCaptureSessionPresetHigh];
if([_captureSessioncanAddInput:_captureInput])
{
[_captureSessionaddInput:_captureInput];
}
if([_captureSessioncanAddOutput:_captureOutput])
{
[_captureSessionaddOutput:_captureOutput];
}
_captureOutput.metadataObjectTypes=@[AVMetadataObjectTypeQRCode];
_capturePreview=[AVCaptureVideoPreviewLayerlayerWithSession:_captureSession];
_capturePreview.videoGravity=AVLayerVideoGravityResizeAspectFill;
_capturePreview.frame=self.view.layer.bounds;
[self.view.layerinsertSublayer:_capturePreviewatIndex:0];
[_captureSessionstartRunning];
}
}
-(void)captureOutput:(AVCaptureOutput*)captureOutputdidOutputMetadataObjects:(NSArray*)metadataObjectsfromConnection:(AVCaptureConnection*)connection
{
if(metadataObjects!=nil&&[metadataObjectscount]>0){
AVMetadataMachineReadableCodeObject*metadataObj=[metadataObjectsobjectAtIndex:0];
NSString*scanCodeResult;
if([[metadataObjtype]isEqualToString:AVMetadataObjectTypeQRCode]){
[selfstopScanCode];
scanCodeResult=metadataObj.stringValue;
//回调信息
if(_delegate&&[_delegaterespondsToSelector:@selector(scanCodeResultByViewController:withScanCodeResult:)]){
[_delegatescanCodeResultByViewController:selfwithScanCodeResult:scanCodeResult];
[self.navigationControllerpopViewControllerAnimated:YES];
}
}else{
NSLog(@"扫描信息错误！");
}
}
}
-(void)systemFlashLight
{
#if!TARGET_IPHONE_SIMULATOR
if([_captureDevicehasTorch]&&[self.captureDevicehasFlash])
{
[_captureSessionbeginConfiguration];
[_captureDevicelockForConfiguration:nil];
if(_captureDevice.torchMode==AVCaptureTorchModeOff)
{
_flashLightBtn.selected=YES;
[_captureDevicesetTorchMode:AVCaptureTorchModeOn];
[_captureDevicesetFlashMode:AVCaptureFlashModeOn];
}
else{
_flashLightBtn.selected=NO;
[_captureDevicesetTorchMode:AVCaptureTorchModeOff];
[_captureDevicesetFlashMode:AVCaptureFlashModeOff];
}
[_captureDeviceunlockForConfiguration];
[_captureSessioncommitConfiguration];
}
#else
[CommonUtilshowAlert:G_ALERTTITLEwithMessage:@"虚拟设备不能运行摄像头！"];
#endif
}
-(void)stopScanCode{
[_captureSessionstopRunning];
_captureSession=nil;
_captureDevice=nil;
_captureInput=nil;
_captureOutput=nil;
[_capturePreviewremoveFromSuperlayer];
}
-(void)didReceiveMemoryWarning{
[superdidReceiveMemoryWarning];
}
@end
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