iOS 二維碼掃描，ios掃描

iOS 二維碼掃描，ios掃描

// 匯入 AVFoundation.framwork 架構
#import "HDCodeViewController.h"#import "HDNormalViewController.h"#import <AVFoundation/AVFoundation.h>@interface HDCodeViewController ()<AVCaptureMetadataOutputObjectsDelegate>@property(strong,nonatomic)UIView *codeView;@property(strong,nonatomic)UIImageView *myLine;@end@implementation HDCodeViewController{    AVCaptureSession *_session;    NSString *_theString;    NSTimer *_timer;    BOOL _upOrdown;    NSInteger _num;}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    [self initUI];    [self prepareCamara];    [self initData];}-(void)dealloc{    [_timer invalidate];    _timer = nil;        _session = nil;}-(void)initData{    _num = 0;}#pragma mark - UI Stuff Methods-(void)initUI{    self.codeView = [[UIView alloc]initWithFrame:CGRectMake(0, 44, SCREEN_WIDTH, SCREEN_HEIGHT - 44)];    self.codeView.backgroundColor = [UIColor clearColor];    [self.view addSubview:self.codeView];        UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake((SCREEN_WIDTH-300)/2, 20, 300, 300)];    imageView.image = [UIImage imageNamed:@"code_square"];    [self.codeView addSubview:imageView];        self.myLine = [[UIImageView alloc] initWithFrame:CGRectMake((SCREEN_WIDTH-300)/2, 20, 300, 2)];    self.myLine.contentMode = UIViewContentModeScaleToFill;    self.myLine.image = [UIImage imageNamed:@"code_movingBar"];    [self.codeView addSubview:self.myLine];        _timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(moveLine) userInfo:nil repeats:YES];}-(void)moveLine{    CGFloat height = self.myLine.frame.origin.y;    CGFloat width = self.myLine.frame.size.width;        if (_upOrdown == NO) {        _num ++;        self.myLine.frame = CGRectMake((SCREEN_WIDTH-300)/2, height+2, width, 2);        if (2*_num == 300) {            _upOrdown = YES;        }    }    else {        _num --;        self.myLine.frame = CGRectMake((SCREEN_WIDTH-300)/2, height-2, width, 2);        if (_num == 0) {            _upOrdown = NO;        }    }}#pragma Camara Stuff Methods-(void)prepareCamara{    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];    AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc]init];    [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];        _session = [[AVCaptureSession alloc]init];    [_session setSessionPreset:AVCaptureSessionPresetHigh];        [_session addInput:input];    [_session addOutput:output];    output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code];        AVCaptureVideoPreviewLayer *layer = [AVCaptureVideoPreviewLayer layerWithSession:_session];    layer.videoGravity = AVLayerVideoGravityResizeAspectFill;    layer.frame = CGRectMake((SCREEN_WIDTH-300)/2, 20, 300, 300);    [self.codeView.layer insertSublayer:layer atIndex:0];        [_session startRunning];}-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{    if (metadataObjects.count>0) {        //[session stopRunning];        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex : 0 ];        _theString = metadataObject.stringValue;        NSLog(@"%@",_theString);//掃出來的字串    }}@end