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生成二维码

#import 
   
    -(UIImage*)getImageFromStr:(NSString*)str{    //创建过滤器    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];    //恢复默认设置    [filter setDefaults];    //给字符串加密    str = [self encryptionStr:str];    NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];    [filter setValue:data forKey:@"inputMessage"];    //获取输出的二维码    CIImage *outputImage = [filter outputImage];    //对图片处理，使其高清    UIImage *image = [self createNonInterpolatedUIImageFormCIImage:outputImage withSize:200];    return image;}//使图片高清-(UIImage*)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size{    CGRect extent = CGRectIntegral(image.extent);    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));;    // 1.创建bitmap;    size_t width = CGRectGetWidth(extent) * scale;    size_t height = CGRectGetHeight(extent) * scale;    CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();    CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);    CIContext *context = [CIContext contextWithOptions:nil];    CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];    CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);    CGContextScaleCTM(bitmapRef, scale, scale);    CGContextDrawImage(bitmapRef, extent, bitmapImage);    // 2.保存bitmap到图片    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);    CGContextRelease(bitmapRef);    CGImageRelease(bitmapImage);    return [UIImage imageWithCGImage:scaledImage];}
   

扫描二维码

#define AUTH_ALERT_TAG (int)281821#define  ScreenHeight  [UIScreen mainScreen].bounds.size.height#define  ScreenWidth   [UIScreen mainScreen].bounds.size.width@interface QRCodeController ()
   
    {    AVCaptureSession * session;//输入输出的中间桥梁    int line_tag;    UIView *highlightView;    NSDictionary * _resultDic;    NSArray *_buddies;}@end@implementation QRCodeController/** *  @author Whde * *  viewDidLoad */- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor whiteColor];    [self instanceDevice];    [VCUtil addTitleView:self :@"添加好友"];    //[VCUtil addBackBtnInNavigation:self];}- (void)instanceDevice{    line_tag = 1872637;    //获取摄像设备    AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];    //创建输入流    AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];    //创建输出流    AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init];    //设置代理 在主线程里刷新    [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];    //初始化链接对象    session = [[AVCaptureSession alloc]init];    //高质量采集率    [session setSessionPreset:AVCaptureSessionPresetHigh];    if (input) {        [session addInput:input];    }    if (output) {        [session addOutput:output];        //设置扫码支持的编码格式(如下设置条形码和二维码兼容)        NSMutableArray *a = [[NSMutableArray alloc] init];        if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeQRCode]) {            [a addObject:AVMetadataObjectTypeQRCode];        }        if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeEAN13Code]) {            [a addObject:AVMetadataObjectTypeEAN13Code];        }        if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeEAN8Code]) {            [a addObject:AVMetadataObjectTypeEAN8Code];        }        if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeCode128Code]) {            [a addObject:AVMetadataObjectTypeCode128Code];        }        output.metadataObjectTypes=a;    }    AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayer layerWithSession:session];    layer.videoGravity=AVLayerVideoGravityResizeAspectFill;    layer.frame=self.view.layer.bounds;    [self.view.layer insertSublayer:layer atIndex:0];    [self setOverlayPickerView];    [self addAnimation];    //开始捕获    [session startRunning];}#pragma 扫码结果 delegate-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{    DLog(@"%@",metadataObjects);    if (metadataObjects.count>0) {        [session stopRunning];        [self removeAnimation];        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex :0];        NSString *data = metadataObject.stringValue;        NSData *strData = [data dataUsingEncoding:NSUTF8StringEncoding];        NSError *error1 = NULL;        id result = [NSJSONSerialization JSONObjectWithData:strData options: NSJSONReadingMutableContainers|NSJSONReadingAllowFragments error:&error1];        }
   

创建扫码界面

#define MarginW (ScreenWidth-235)/2#define MarginH (ScreenHeight-235)/2- (void)setOverlayPickerView{    //左侧的view    UIImageView *leftView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, MarginW, ScreenHeight)];    leftView.alpha = 0.5;    leftView.backgroundColor = [UIColor blackColor];    [self.view addSubview:leftView];    //右侧的view    UIImageView *rightView = [[UIImageView alloc] initWithFrame:CGRectMake(235+MarginW, 0, MarginW, ScreenHeight)];    rightView.alpha = 0.5;    rightView.backgroundColor = [UIColor blackColor];    [self.view addSubview:rightView];    //最上部view    UIImageView* upView = [[UIImageView alloc] initWithFrame:CGRectMake(MarginW, 0, ScreenWidth-2*MarginW, MarginH)];    upView.alpha = 0.5;    upView.backgroundColor = [UIColor blackColor];    [self.view addSubview:upView];    //底部view    UIImageView * downView = [[UIImageView alloc] initWithFrame:CGRectMake(MarginW, MarginH+235, (ScreenWidth-2*MarginW), MarginH)];    downView.alpha = 0.5;    downView.backgroundColor = [UIColor blackColor];    [self.view addSubview:downView];    UIImageView *centerView = [[UIImageView alloc] initWithFrame:CGRectMake(MarginW, MarginH, 235, 235)];    centerView.image = [UIImage imageNamed:@"scankuang.png"];    centerView.contentMode = UIViewContentModeScaleAspectFill;    centerView.backgroundColor = [UIColor clearColor];    [self.view addSubview:centerView];    UIImageView *line = [[UIImageView alloc] initWithFrame:CGRectMake(MarginW, MarginH, 235, 2)];    line.tag = line_tag;    line.image = [UIImage imageNamed:@"scanline"];    line.contentMode = UIViewContentModeScaleAspectFill;    line.backgroundColor = [UIColor clearColor];    [self.view addSubview:line];    UILabel *msg = [[UILabel alloc] initWithFrame:CGRectMake(MarginW, MarginH-60, ScreenWidth-2*MarginW, 60)];    msg.backgroundColor = [UIColor clearColor];    msg.textColor = [UIColor whiteColor];    msg.textAlignment = NSTextAlignmentCenter;    msg.font = [UIFont systemFontOfSize:16];    msg.text = @"将二维码放入框内,即可自动扫描";    [self.view addSubview:msg];}

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