维码扫描
2014-06-13 10:20:29| 分类： |举报|字号
// 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;