title: iOS二维码操作
date: 2016-05-11 16:51:31

iOS-ScanningCode

功能：扫描二维码、条形码，生成二维码。具体使用请看项目。github地址喜欢的朋友们给个星星吧。萌萌哒。

Image Displey(图片展示)

使用方法

首先，你需要把项目中的XYLScaningCodeKit文件夹拖拽到你的项目任意位置，然后就可以开始使用了。
添加二维码界面
假如你需要在项目中需要使用生成二维码的功能，仅仅需要引入头文件和创建二维码视图并添加就可以了。例如这样：

#import 'XYLScaningCode.h'@interface ViewController ()@property(strong, nonatomic)XYLBinaryCodeView *binaryCodeView;  //二维码界面@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor blackColor];    //设置生成二维码界面    self.binaryCodeView = [[XYLBinaryCodeView alloc]initWithFrame:[UIScreen mainScreen].bounds];    //设置二维码的内容    self.binaryCodeView.inputData = @'www.baidu.com';    [self.view insertSubview:self.binaryCodeView atIndex:1];}

添加扫描二维码、条形码功能
假如你需要使用扫码的功能，那代码稍微多一点点，多的部分就是开始扫码、读取扫码结果、处理扫码结果那部分。
同样的，你也需要引入上面的头文件；
然后就是一些逻辑了，不用太担心，因为我会有很多的注释，而且后面还会详细分析。代码如下：

#import 'ViewController.h'#import 'XYLScaningCode.h'@interface ViewController ()UIAlertViewDelegate, AVCaptureMetadataOutputObjectsDelegate, XYLScanViewDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate>{    AVCaptureDevice *frontCamera;  //前置摄像机    AVCaptureDevice *backCamera;  //后置摄像机    AVCaptureSession *session;         //捕捉对象    AVCaptureVideoPreviewLayer *previewLayer;    AVCaptureInput *input;              //输入流    AVCaptureMetadataOutput *output;//输出流    BOOL isTorchOn;}@property (nonatomic, assign) XYLScaningWarningTone tone;@property (nonatomic, strong) XYLScanView *overView;    //扫码界面@property(strong, nonatomic)XYLBinaryCodeView *binaryCodeView;  //二维码界面@property(weak, nonatomic)XYLToolButton *scanButton;@property(weak, nonatomic)XYLToolButton *payCodeButton;@property(weak, nonatomic)UILabel *titleLabel;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor blackColor];    [self scanSelected];}    //点击扫码-(void)scanSelected{    if (![self.overView isDisplayedInScreen])    {#if TARGET_IPHONE_SIMULATOR    UIAlertController *simulatorAlert = [UIAlertController alertControllerWithTitle:nil message:@'虚拟机不支持相机' preferredStyle:UIAlertControllerStyleActionSheet];    [simulatorAlert addAction:[UIAlertAction actionWithTitle:@'好吧' style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {        return;    }]];    [self presentViewController:simulatorAlert animated:YES completion:nil];#elif TARGET_OS_IPHONE    self.binaryCodeView.hidden = YES;    if (self.overView) {        self.overView.hidden = NO;    }else{        //添加扫面界面视图        [self initOverView];        [self initCapture];        [self config];        [self initUI];        [self addGesture];    }#endif    }}

/** *  添加扫码视图 */- (void)initOverView{    if (!_overView) {        _overView = [[XYLScanView alloc]initWithFrame:[UIScreen mainScreen].bounds lineMode:XYLScaningLineModeDeafult ineMoveMode:XYLScaningLineMoveModeUpAndDown];        _overView.delegate = self;        [self.view insertSubview:_overView atIndex:1];    }}//设置扫描反馈模式：这里是声音提示- (void)config{    _tone = XYLScaningWarningToneSound;}

系统方法捕捉二维码、条形码信息

- (void)initCapture{    //创建捕捉会话    session = [[AVCaptureSession alloc]init];    //高质量采集率    [session setSessionPreset:AVCaptureSessionPresetHigh];    //获取摄像设备    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];    for (AVCaptureDevice *camera in devices) {        if (camera.position == AVCaptureDevicePositionFront) {            frontCamera = camera;        }else{            backCamera = camera;        }    }    //创建输入流    input = [AVCaptureDeviceInput deviceInputWithDevice:backCamera error:nil];        //输出流    output = [[AVCaptureMetadataOutput alloc]init];    //设置代理 在主线程里刷新    [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];        //添加输入设备(数据从摄像头输入)    if ([session canAddInput:input]) {        [session addInput:input];    }    //添加输出数据    if ([session canAddOutput:output]) {        [session addOutput:output];    }    //设置设置输入元数据的类型(如下设置条形码和二维码兼容)    output.metadataObjectTypes = @[AVMetadataObjectTypeEAN13Code,                                   AVMetadataObjectTypeEAN8Code,                                   AVMetadataObjectTypeCode128Code,                                   AVMetadataObjectTypeQRCode];    //添加扫描图层    previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:session];    previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;    previewLayer.frame = self.view.layer.bounds;    [self.view.layer insertSublayer:previewLayer atIndex:0];        //开始捕获    [session startRunning];            CGFloat screenHeight = ScreenSize.height;    CGFloat screenWidth = ScreenSize.width;    CGRect cropRect = CGRectMake((screenWidth - TransparentArea([_overView width], [_overView height]).width) / 2,                                 (screenHeight - TransparentArea([_overView width], [_overView height]).height) / 2,                                 TransparentArea([_overView width], [_overView height]).width,                                 TransparentArea([_overView width], [_overView height]).height);    //设置扫描区域    [output setRectOfInterest:CGRectMake(cropRect.origin.y / screenHeight,                                         cropRect.origin.x / screenWidth,                                         cropRect.size.height / screenHeight,                                         cropRect.size.width / screenWidth)];    }

获取结果

/** * 获取扫描数据 */- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{    NSString *stringValue;    if (metadataObjects.count > 0) {        AVMetadataMachineReadableCodeObject *metadateObject = [metadataObjects objectAtIndex:0];        stringValue = metadateObject.stringValue;        [self readingFinshedWithMessage:stringValue];        [previewLayer removeFromSuperlayer];    }}/** *  读取扫描结果 */- (void)readingFinshedWithMessage:(NSString *)msg{    if (msg) {        [session stopRunning];                [self playSystemSoundWithStyle:_tone];                [self.overView stopMove];                UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:msg preferredStyle:UIAlertControllerStyleActionSheet];        [alert addAction:[UIAlertAction actionWithTitle:@'确定' style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {            NSLog(@'扫描出来结果%@',msg);            //todo：在这里添加扫描结果后的处理            [self.overView removeFromSuperview];            self.overView = nil;            [self payCodeSelected];        }]];        [self presentViewController:alert animated:YES completion:nil];    }else    {        UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:@'读取失败' preferredStyle:UIAlertControllerStyleActionSheet];        [alert addAction:[UIAlertAction actionWithTitle:@'确定' style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {            NSLog(@'点击了确定');        }]];        [self presentViewController:alert animated:true completion:nil];    }}

扫码成功声音提示

/** *  展示声音提示 */- (void)playSystemSoundWithStyle:(XYLScaningWarningTone)tone{        NSString *path = [NSString stringWithFormat:@'%@/scan.wav', [[NSBundle mainBundle] resourcePath]];    SystemSoundID soundID;    NSURL *filePath = [NSURL fileURLWithPath:path isDirectory:NO];    AudioServicesCreateSystemSoundID((__bridge CFURLRef)(filePath), &soundID);    switch (tone) {        case XYLScaningWarningToneSound:            AudioServicesPlaySystemSound(soundID);            break;        case XYLScaningWarningToneVibrate:            AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);            break;        case XYLScaningWarningToneSoundAndVibrate:            AudioServicesPlaySystemSound(soundID);            AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);            break;        default:            break;    }}

说明
你可能看到了，添加扫码功能的时候，要遵循更多的协议，这是因为这里使用了AVFoundation框架Apple原生扫描二维码的一些功能，只需要遵循这些协议就可以调用里面的功能了。例如这里的获取扫码结果的方法

/** * 获取扫描数据 */- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection;

而其余的，这里详细的注释就可以帮助你理解这些代码了，如果想深入了解具体实现过程，建议可以看一下源码github地址。

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