QRReader/ReaderHelper.m at master · jonathanli2/QRReader · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
//
//  ReaderHelper.m
//  QRQuickReader
//
//  Created by Li, Jonathan on 4/11/15.
//  Copyright (c) 2015 It21Learning. All rights reserved.
//

#import "ReaderHelper.h"

@implementation ReaderHelper

-(id)init{
    if (self == [super init]){
        [self loadBeepSound];
        return self;
    }
    else{
        return nil;
    }
}

-(void)playSound{
    [self.audioPlayer play];
}

-(void)loadBeepSound{
    NSString *beepFilePath = [[NSBundle mainBundle] pathForResource:@"beep" ofType:@"mp3"];
    NSURL *beepURL = [NSURL URLWithString:beepFilePath];
    NSError *error;

    _audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:beepURL error:&error];
    if (error) {
        NSLog(@"Could not play beep file.");
        NSLog(@"%@", [error localizedDescription]);
    }
    else{
        [_audioPlayer prepareToPlay];
    }
}


- (void)startRead:(UIView*)preview onCompletion:(void (^)(NSString*))complete {
    NSError *error;

    self.completionBlock = complete;

    AVCaptureDevice *captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error];

    if (!input) {
        NSLog(@"%@", [error localizedDescription]);
    }
    else{
        _captureSession = [[AVCaptureSession alloc] init];
        [_captureSession addInput:input];

        AVCaptureMetadataOutput *captureMetadataOutput = [[AVCaptureMetadataOutput alloc] init];
        [_captureSession addOutput:captureMetadataOutput];

        dispatch_queue_t dispatchQueue;
        dispatchQueue = dispatch_queue_create("myQueue", NULL);
        [captureMetadataOutput setMetadataObjectsDelegate:self queue:dispatchQueue];
        [captureMetadataOutput setMetadataObjectTypes:[NSArray arrayWithObject:AVMetadataObjectTypeQRCode]];

        _videoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:_captureSession];
        [_videoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
        [_videoPreviewLayer setFrame:preview.layer.bounds];
        [preview.layer addSublayer:_videoPreviewLayer];


        [_captureSession startRunning];
    }
}

-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{
    if (metadataObjects != nil && [metadataObjects count] > 0) {
        AVMetadataMachineReadableCodeObject *metadataObj = [metadataObjects objectAtIndex:0];
        if ([[metadataObj type] isEqualToString:AVMetadataObjectTypeQRCode]) {
            dispatch_async(dispatch_get_main_queue(), ^{
                [self playSound];

                self.completionBlock([metadataObj stringValue]);

                [_captureSession stopRunning];
            //    [_videoPreviewLayer removeFromSuperlayer];
                _captureSession = nil;

            });
        }
    }
}


@end