iOS 二維碼掃描

// 導入 AVFoundation.framwork 框架
#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);//掃出來的字元串
    }
}

@end