iOS 7 二维码

//

//  TCTosweepScan.m

//  TongChengSearch

//

//  Created by Fighting on 14-6-11.

//  Copyright (c) 2014年 tcsos.com. All rights reserved.

//

#import "TCTosweepScan.h"

#import <AVFoundation/AVFoundation.h>

@interface TCTosweepScan()<AVCaptureMetadataOutputObjectsDelegate>

@property (strong, nonatomic)AVCaptureDevice *device;

@property (strong, nonatomic)AVCaptureDeviceInput *input;

@property (strong, nonatomic)AVCaptureMetadataOutput *output;

@property (strong, nonatomic)AVCaptureSession *session;

@property (strong, nonatomic)AVCaptureVideoPreviewLayer *preview;

@end

@implementation TCTosweepScan

- (instancetype)initConfigWith:(CGRect)frame previewFrame:(CGRect)previewFrame {

if (self = [super init]) {

self.frame = frame;

self.autoresizingMask = YES;

//初始化UI

[self initUI:previewFrame];

}

return self;

}

- (void)dealloc {

// 1. 如果扫描完成，停止会话

[session stopRunning];

// 2. 删除预览图层

[preview removeFromSuperlayer];

[output setMetadataObjectsDelegate:nil queue:nil];

}

//初始化UI

- (void)initUI:(CGRect)previewFrame {

// Device

device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

NSError *error = nil;

// Input

input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];

if (error) {

NSLog(@"你手机不支持二维码扫描!");

return;

}

// Output

output = [[AVCaptureMetadataOutput alloc] init];

[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

// Session

session = [[AVCaptureSession alloc] init];

[session setSessionPreset:AVCaptureSessionPresetHigh];

if ([session canAddInput:input]) {

[session addInput:input];

}

if ([session canAddOutput:output]) {

[session addOutput:output];

}

// 条码类型

output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];

// Preview

preview = [AVCaptureVideoPreviewLayer layerWithSession:session];

preview.videoGravity = AVLayerVideoGravityResizeAspectFill;

preview.frame = previewFrame;

[self.layer addSublayer:preview];

}

//启动扫描

- (void)startScan {

// Start

[session startRunning];

}

// 此方法是在识别到QRCode，并且完成转换

// 如果QRCode的内容越大，转换需要的时间就越长

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {

// 1. 如果扫描完成，停止会话

[session stopRunning];

// 2. 删除预览图层

[preview removeFromSuperlayer];

NSString *val = nil;

if (metadataObjects.count > 0) {

AVMetadataMachineReadableCodeObject *obj = metadataObjects[0];

val = obj.stringValue;

}

if (delegate && [delegate respondsToSelector:@selector(TCTosweepScanDidEnd:)]) {

[delegate TCTosweepScanDidEnd:val];

}

}

@synthesize delegate;

@synthesize device;

@synthesize input;

@synthesize output;

@synthesize session;

@synthesize preview;