.h文件中做的事情：
//
// FindSweepCodeViewController.h
// Toon
//
// Created by liguoting on 14/11/3.
// Copyright (c) 2014年 syswin. All rights reserved.
//
#import "BaseViewController.h"
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import "ActivityDetailViewController.h"
#import "ActivityInfoModel.h"
@interface FindSweepCodeViewController : BaseViewController<AVCaptureMetadataOutputObjectsDelegate>
{
int num;
BOOL upOrDown;
NSTimer *timer;
}
@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;
@property (nonatomic, retain) UIImageView *line;
@end
.m中：
//
// FindSweepCodeViewController.m
// Toon
//
// Created by liguoting on 14/11/3.
// Copyright (c) 2014年 syswin. All rights reserved.
//
#import "FindSweepCodeViewController.h"
#import "SweepResultViewController.h"
#import "CardOwnerController.h"
@interface FindSweepCodeViewController ()
{
NSString *_cardId;
NSString *_userId;
NSString *_activityId;
}
@end
@implementation FindSweepCodeViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationItem.title = @"二维码";
self.view.backgroundColor = [UIColor whiteColor];
// UIButton * scanButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
// [scanButton setTitle:@"取消" forState:UIControlStateNormal];
// scanButton.frame = CGRectMake(100, 420, 120, 40);
// [scanButton addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside];
// [self.view addSubview:scanButton];
UILabel * labIntroudction= [[UILabel alloc] initWithFrame:CGRectMake((ScreenFrameWith-240)/2, 256, 240, 40)];
labIntroudction.backgroundColor = [UIColor clearColor];
labIntroudction.font = [UIFont systemFontOfSize:15];
labIntroudction.textAlignment = NSTextAlignmentCenter;
labIntroudction.numberOfLines=1;
labIntroudction.textColor=[UIColor whiteColor];
labIntroudction.text=@"将二维码放到框内即可自动扫描";
[self.view addSubview:labIntroudction];
UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake((ScreenFrameWith-180)/2, 43, 180, 183)];
imageView.image = [UIImage imageNamed:@"sweap_box"];
[self.view addSubview:imageView];
upOrDown = NO;
num =0;
/**
此块代码为扫描先上下滑动的效果，此处需求不要
:returns: return value description
*/
self.line = [[UIImageView alloc] initWithFrame:CGRectMake((ScreenFrameWith-180)/2, 43, 180, 4)];
self.line.image = [UIImage imageNamed:@"sweap_line"];
[self.view addSubview:self.line];
timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(animation1) userInfo:nil repeats:YES];
// Do any additional setup after loading the view from its nib.
//创建返回首页按钮
self.navigationItem.leftBarButtonItem = [ISSUtility barButtonItemWithTarget:self action:@selector(backBttnClickDown) normalImage:@"header_icon_back.png" highLightImage:@"header_icon_back.png" title:nil titleColor:nil frame:CGRectMake(0,0,40,40)];
}
-(void)animation1
{
if (upOrDown == NO) {
num ++;
self.line.frame = CGRectMake((ScreenFrameWith-180)/2, 43+2*num, 180, 2);
if (2*num >= 180) {
upOrDown = YES;
}
}
else {
num --;
self.line.frame = CGRectMake((ScreenFrameWith-180)/2, 43+2*num, 180, 2);
if (num == 0) {
upOrDown = NO;
}
}
}
#pragma mark ------按钮点击事件--------
-(void)backBttnClickDown
{
[self.navigationController popViewControllerAnimated:YES];
}
-(void)backAction
{
[self.navigationController popViewControllerAnimated:YES];
[timer invalidate];
}
-(void)viewWillAppear:(BOOL)animated
{
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
if (authStatus == AVAuthorizationStatusDenied)
{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"无法访问通讯录" message:@"请到“设置->隐私->相机”中将toon设置为允许访问相机！" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
[alert show];
}else
{
[self setupCamera];
}
}
#pragma mark ----alertView的代理-------
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
[self.navigationController popViewControllerAnimated:YES];
}
- (void)setupCamera
{
// Device
_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if(_device == nil)
{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"未检测到相机" message:@"请检查相机设备是否正常" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
[alert show];
return ;
}
// Input
_input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];
// Output
_output = [[AVCaptureMetadataOutput alloc]init];
[_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
//限制扫描区域（上左下右）
// [ _output setRectOfInterest : CGRectMake ( 43 / ScreenFrameHeight ,(( ScreenFrameWith - 180 )/ 2 )/ ScreenFrameWith , 183 /ScreenFrameHeight , 180 / ScreenFrameWith)];
[ _output setRectOfInterest : CGRectMake ( 43 / ScreenFrameHeight ,(( ScreenFrameWith - 150 )/ 2 )/ ScreenFrameWith , 213 /ScreenFrameHeight , 210 / ScreenFrameWith)];
// [ _output setRectOfInterest : CGRectMake (0.5 ,0.5,0.5 , 0.5)];
// Session
_session = [[AVCaptureSession alloc]init];
[_session setSessionPreset:AVCaptureSessionPresetHigh];
if ([_session canAddInput:self.input])
{
[_session addInput:self.input];
}
if ([_session canAddOutput:self.output])
{
[_session addOutput:self.output];
}
// 条码类型 AVMetadataObjectTypeQRCode
_output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];
// Preview
_preview =[AVCaptureVideoPreviewLayer layerWithSession:self.session];
_preview.videoGravity = AVLayerVideoGravityResizeAspectFill;
//_preview.frame =CGRectMake((ScreenFrameWith-180)/2,44,180,182);
_preview.frame =CGRectMake(0,0,ScreenFrameWith,ScreenFrameHeight-44);
[self.view.layer insertSublayer:self.preview atIndex:0];
// Start
[_session startRunning];
}
#pragma mark AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
NSString *stringValue;
if ([metadataObjects count] >0)
{
AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
stringValue = metadataObject.stringValue;
}
[_session stopRunning];
//[self.navigationController popViewControllerAnimated:YES];
[timer invalidate];
#pragma mark -----在此处判断是否为toon内部使用的url--------
if([stringValue hasPrefix:@"http://www.sqtoon.com/todownLoad.do?"])//判断如果为toon可识别的url
{
CardOwnerController *cardOwner = [[CardOwnerController alloc]init];
cardOwner.type= 1;
NSString *keyValueStr = [stringValue substringFromIndex:36];
NSLog(@"keyValueStr:%@",keyValueStr);
NSArray *tempArr = [keyValueStr componentsSeparatedByString:@"&"];
if([tempArr count] == 2)//说明为名片二维码
{
_cardId = [tempArr[1] substringFromIndex:7];
NSLog(@"_cardId:%@",_cardId);
cardOwner.friendCardId = [NSString stringWithFormat:@"%@",_cardId];
[self.navigationController pushViewController:cardOwner animated:YES];
}
if([tempArr count] == 3)
{
ActivityInfoModel *model = [[ActivityInfoModel alloc]init];
model.cardId = [tempArr[1] substringFromIndex:7];
model.activityId = [tempArr[2] substringFromIndex:11];
ActivityDetailViewController *detail = [[ActivityDetailViewController alloc]initWithActivityModel:model];
[self.navigationController pushViewController:detail animated:YES];
}
}else //不是toon内部url
{
SweepResultViewController *sweepResult = [[SweepResultViewController alloc]init];
sweepResult.urlStr = stringValue;
[self.navigationController pushViewController:sweepResult animated:YES];
}
NSLog(@"stringValue: %@",stringValue);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
核心就是上面限制扫描区域的一句话，哈哈，到此你就可以去运行了；
好多人说系统方法没有第三方库的扫描速度快，这里我必须说一下，亲测系统的方法扫描速度杠杠滴；尤其是不限制扫描区域的时候，限制了之后会有所下降，但依然是很灵敏的；不得不说苹果一出，必属精品。下面是运行效果图。。。。。。。
系统方法实现仿微信、支付宝二维码扫描 实现 （限制扫描区域、相机背景）
原文地址：http://blog.csdn.net/lgt0605/article/details/42234483
