系统扫描二维码 调整焦距
//
// ScanViewController.m
// ScanTest
//
// Created by LvZhao on 16/1/4.
// Copyright © 2016年 iOS. All rights reserved.
//
AssetsLibrary
AVFoundation 导入库
#import "ScanViewController.h"
#import
#import
#define NAVBARHEIGHT 64
#define SCREENWIDTH [UIScreen mainScreen].bounds.size.width
#define SCREENHEIGHT [UIScreen mainScreen].bounds.size.height
#define TARGETY (SCREENHEIGHT - NAVBARHEIGHT - 300)/2
#define DARKCOLOR_ALPHA 0.5 //深色透明度
@interface ScanViewController ()<AVCaptureMetadataOutputObjectsDelegate,UIGestureRecognizerDelegate>
{
UIView *_scanView;
NSTimer *_timer;
UIImageView *_qrCodeline;;
}
/**
* 记录开始的缩放比例
*/
@property(nonatomic,assign)CGFloat beginGestureScale;
/**
* 最后的缩放比例
*/
@property(nonatomic,assign)CGFloat effectiveScale;
/**
* 照片输出流
*/
@property (nonatomic, strong)AVCaptureStillImageOutput* stillImageOutput;
@property (nonatomic, strong)UIImageView *focusImageV;
@property (nonatomic,retain)AVCaptureSession *capSession;
@property (strong, nonatomic)AVCaptureDeviceInput *input;
@property (strong, nonatomic)AVCaptureMetadataOutput *output;
@property (strong, nonatomic)AVCaptureVideoPreviewLayer *preview;
typedef void(^PropertyChangeBlock)(AVCaptureDevice *captureDevice);
@end
@implementation ScanViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self setScanView];
self.effectiveScale = self.beginGestureScale = 1.0f;
_isPush = NO;
[self checkAVAuthorizationStatus];
//画中间的基准线
_qrCodeline = [[UIImageView alloc] initWithFrame:CGRectMake((SCREENWIDTH-300)/2,TARGETY, 300,2)];
_qrCodeline.image = [UIImage imageNamed:@"saomiaoxian"];
[self.view addSubview:_qrCodeline];
[self createTimer];
// Do any additional setup after loading the view.
}
- (void)createTimer
{
//创建一个时间计数
_timer=[NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(moveUpAndDownLine) userInfo:nil repeats:YES];
}
//二维码的横线移动
- (void)moveUpAndDownLine
{
CGFloat Y=_qrCodeline.frame.origin.y;
if (TARGETY + 300 ==Y){
_qrCodeline.frame = CGRectMake((SCREENWIDTH-300)/2, TARGETY, 300,2);
}else if(TARGETY ==Y){
}
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:3];
_qrCodeline.frame=CGRectMake((SCREENWIDTH-300)/2, TARGETY +300, 300,2);
[UIView commitAnimations];
}
- (void)stopTimer
{
if ([_timer isValid] == YES) {
[_timer invalidate];
_timer =nil;
}
}
#pragma mark -- 二维码的扫描区域
- (void)setScanView
{
_scanView=[[UIView alloc] initWithFrame:CGRectMake(0,0, SCREENWIDTH,SCREENHEIGHT-NAVBARHEIGHT)];
_scanView.backgroundColor=[UIColor clearColor];
/******************中间扫描区域****************************/
UIImageView *scanCropView=[[UIImageView alloc] initWithFrame:CGRectMake((SCREENWIDTH-300)/2,TARGETY, 300,300)];
scanCropView.image=[UIImage imageNamed:@"saoyisaolv"];
// scanCropView.layer.borderColor=[UIColor whiteColor].CGColor;
// scanCropView.layer.borderWidth=1.0;
scanCropView.backgroundColor=[UIColor clearColor];
[_scanView addSubview:scanCropView];
//用于说明的label
UILabel *labIntroudction= [[UILabel alloc] init];
labIntroudction.backgroundColor = [UIColor clearColor];
labIntroudction.frame=CGRectMake(0,CGRectGetMaxY(scanCropView.frame)+5, SCREENWIDTH,20);
labIntroudction.numberOfLines=1;
labIntroudction.font=[UIFont systemFontOfSize:15.0];
labIntroudction.textAlignment = NSTextAlignmentCenter;
labIntroudction.textColor=[UIColor clearColor];
labIntroudction.text=@"将二维码对准方框，即可自动扫描";
[_scanView addSubview:labIntroudction];
UIView *darkViewBottom = [[UIView alloc] initWithFrame:CGRectMake(0, CGRectGetMaxY(scanCropView.frame),SCREENWIDTH, self.view.bounds.size.height - CGRectGetMaxY(scanCropView.frame))];
darkViewBottom.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:DARKCOLOR_ALPHA];
[_scanView addSubview:darkViewBottom];
UIView *darkViewleft = [[UIView alloc] initWithFrame:CGRectMake(0, 0 ,(SCREENWIDTH-300)/2, CGRectGetMinY(scanCropView.frame) + 300)];
darkViewleft.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:DARKCOLOR_ALPHA];
[_scanView addSubview:darkViewleft];
UIView *darkViewTop = [[UIView alloc] initWithFrame:CGRectMake(CGRectGetMaxX(darkViewleft.frame), 0 ,SCREENWIDTH - 2 * CGRectGetMaxX(darkViewleft.frame) , CGRectGetMinY(scanCropView.frame))];
darkViewTop.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:DARKCOLOR_ALPHA];
[_scanView addSubview:darkViewTop];
UIView *darkViewRight = [[UIView alloc] initWithFrame:CGRectMake(CGRectGetMaxX(scanCropView.frame), 0 ,SCREENWIDTH, self.view.bounds.size.height - CGRectGetHeight(darkViewBottom.frame))];
darkViewRight.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:DARKCOLOR_ALPHA];
[_scanView addSubview:darkViewRight];
// UIImageView * bgImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"sanguang"]];
// bgImageView.frame = CGRectMake((SCREENWIDTH - 150)/2, 20, 150, 40);
// bgImageView.userInteractionEnabled = YES;
// [darkView addSubview:bgImageView];
// 用于开关灯操作的button
UIButton *openButton=[[UIButton alloc] initWithFrame:CGRectMake(0, 22,40,42)];
[openButton setTitle:@"开启闪光灯" forState:UIControlStateNormal];
openButton.titleEdgeInsets = UIEdgeInsetsMake(0, 40, 0, 0);
[openButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
// openButton.titleLabel.textAlignment=NSTextAlignmentCenter;
openButton.titleLabel.font=[UIFont systemFontOfSize:20];
[openButton addTarget:self action:@selector(openLight:)forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:openButton];
[self.view addSubview:_scanView];
}
#pragma mark - 开扫描
- (void)checkAVAuthorizationStatus
{
NSString *mediaType = AVMediaTypeVideo;
AVAuthorizationStatus author = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
if (ALAuthorizationStatusDenied == author)
{
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"请授权访问相机" message:@"设置方式:手机设置->隐私->照机" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定" ,nil];
[alertView show];
return;
}else if(ALAuthorizationStatusRestricted == author)
{
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"您的相机权限受限" message:@"此应用程序没有被授权访问的照相机。可能是家长控制权限。" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
[alertView show];
return;
}
[self setupCamera];
[self setUpGesture];
[self addTapGensture];
//
}
BOOL _isPush;
#pragma 创建手势
- (void)setUpGesture{
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinchGesture:)];
pinch.delegate = self;
[self.view addGestureRecognizer:pinch];
}
#pragma mark gestureRecognizer delegate
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
if ( [gestureRecognizer isKindOfClass:[UIPinchGestureRecognizer class]] ) {
self.beginGestureScale = self.effectiveScale;
}
return YES;
}
//缩放手势 用于调整焦距
- (void)handlePinchGesture:(UIPinchGestureRecognizer *)recognizer{
BOOL allTouchesAreOnThePreviewLayer = YES;
NSUInteger numTouches = [recognizer numberOfTouches], i;
for ( i = 0; i < numTouches; ++i ) {
CGPoint location = [recognizer locationOfTouch:i inView:self.view];
CGPoint convertedLocation = [_preview convertPoint:location fromLayer:_preview.superlayer];
if ( ! [_preview containsPoint:convertedLocation] ) {
allTouchesAreOnThePreviewLayer = NO;
break;
}
}
if ( allTouchesAreOnThePreviewLayer ) {
self.effectiveScale = self.beginGestureScale * recognizer.scale;
if (self.effectiveScale < 1.0){
self.effectiveScale = 1.0;
}
NSLog(@"%f-------------->%f------------recognizerScale%f",self.effectiveScale,self.beginGestureScale,recognizer.scale);
CGFloat maxScaleAndCropFactor = [[self.stillImageOutput connectionWithMediaType:AVMediaTypeVideo] videoMaxScaleAndCropFactor];
NSLog(@"%f",maxScaleAndCropFactor);
//5.f为写死的最大放大倍数
if (self.effectiveScale > 5.f)
self.effectiveScale = 5.f;
[CATransaction begin];
[CATransaction setAnimationDuration:.025];
[_preview setAffineTransform:CGAffineTransformMakeScale(self.effectiveScale, self.effectiveScale)];
[CATransaction commit];
}
}
/**
* 添加点按手势，点按时聚焦
*/
-(void)addTapGensture{
UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapScreen:)];
[self.view addGestureRecognizer:tapGesture];
_focusImageV = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 76.f, 76.f)];
_focusImageV.alpha = 0.f;
_focusImageV.image = [UIImage imageNamed:@"camera_focus_red"];
[self.view addSubview:_focusImageV];
}
-(void)tapScreen:(UITapGestureRecognizer *)tapGesture{
CGPoint point= [tapGesture locationInView:self.view];
//将UI坐标转化为摄像头坐标
CGPoint cameraPoint= [_preview captureDevicePointOfInterestForPoint:point];
[self setFocusImageWithPoint:point];
[self focusWithMode:AVCaptureFocusModeAutoFocus exposureMode:AVCaptureExposureModeAutoExpose atPoint:cameraPoint];
}
/**
* 设置聚焦光标位置
*
* @param point 光标位置
*/
-(void)setFocusImageWithPoint:(CGPoint)point{
self.focusImageV.center=point;
self.focusImageV.transform=CGAffineTransformMakeScale(1.5, 1.5);
self.focusImageV.alpha=1.0;
[UIView animateWithDuration:1.0 animations:^{
self.focusImageV.transform=CGAffineTransformIdentity;
} completion:^(BOOL finished) {
self.focusImageV.alpha=0;
}];
}
/**
* 设置聚焦点
*
* @param point 聚焦点
*/
-(void)focusWithMode:(AVCaptureFocusMode)focusMode exposureMode:(AVCaptureExposureMode)exposureMode atPoint:(CGPoint)point{
[self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
if ([captureDevice isFocusModeSupported:focusMode]) {
[captureDevice setFocusMode:AVCaptureFocusModeAutoFocus];
}
if ([captureDevice isFocusPointOfInterestSupported]) {
[captureDevice setFocusPointOfInterest:point];
}
if ([captureDevice isExposureModeSupported:exposureMode]) {
[captureDevice setExposureMode:AVCaptureExposureModeAutoExpose];
}
if ([captureDevice isExposurePointOfInterestSupported]) {
[captureDevice setExposurePointOfInterest:point];
}
}];
}
/**
* 改变设备属性的统一操作方法
*
* @param propertyChange 属性改变操作
*/
-(void)changeDeviceProperty:(PropertyChangeBlock)propertyChange{
AVCaptureDevice *captureDevice= [self.input device];
NSError *error;
//注意改变设备属性前一定要首先调用lockForConfiguration:调用完之后使用unlockForConfiguration方法解锁
if ([captureDevice lockForConfiguration:&error]) {
propertyChange(captureDevice);
[captureDevice unlockForConfiguration];
}else{
NSLog(@"设置设备属性过程发生错误，错误信息：%@",error.localizedDescription);
}
}
- (void)setupCamera {
//session---------------------------------
_capSession = [[AVCaptureSession alloc] init];
//input
AVCaptureDevice *frontCamera = nil;
AVCaptureDevice *backCamera = nil;
NSArray *cameras = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *camera in cameras) {
if (camera.position == AVCaptureDevicePositionFront) {
frontCamera = camera;
} else {
backCamera = camera;
}
}
[backCamera lockForConfiguration:nil];
if ([backCamera isExposureModeSupported:AVCaptureExposureModeContinuousAutoExposure]) {
[backCamera setExposureMode:AVCaptureExposureModeContinuousAutoExposure];
}
[backCamera unlockForConfiguration];
_input = [AVCaptureDeviceInput deviceInputWithDevice:backCamera error:nil];
[_capSession addInput:_input];
// Output
_output = [[AVCaptureMetadataOutput alloc]init];
[_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[_capSession addOutput:_output];
// 条码类型 AVMetadataObjectTypeQRCode
_output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];
//preset
_capSession.sessionPreset = AVCaptureSessionPresetHigh;
//resolution
if ([_capSession canSetSessionPreset:AVCaptureSessionPreset1920x1080]) {
[_capSession setSessionPreset:AVCaptureSessionPreset1920x1080];
}else if ([_capSession canSetSessionPreset:AVCaptureSessionPreset1280x720]) {
[_capSession setSessionPreset:AVCaptureSessionPreset1280x720];
}else if ([_capSession canSetSessionPreset:AVCaptureSessionPreset640x480]) {
[_capSession setSessionPreset:AVCaptureSessionPreset640x480];
}
//preview layer-----------------
_preview =[AVCaptureVideoPreviewLayer layerWithSession:_capSession];
_preview.videoGravity = AVLayerVideoGravityResizeAspectFill;
_preview.frame = self.view.bounds;
[self.view.layer insertSublayer:self.preview atIndex:0];
[_capSession startRunning];
}
#pragma mark -- 扫描回调
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{
NSLog(@"测试");
if (YES == _isPush) return ;
_isPush = YES;
NSString *stringValue;
if ([metadataObjects count] >0)
{
AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
stringValue = metadataObject.stringValue;
}
[_capSession stopRunning];
[_timer invalidate];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
// [self.navigationController popViewControllerAnimated:NO];
[_timer invalidate];
//判断是否包含 头'http:'
NSString *regex = @"http+:[^\\s]*";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
if ([predicate evaluateWithObject:stringValue]) {
[self dismissViewControllerAnimated:YES completion:^{
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:stringValue]];
}];
}
});
}
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[_capSession startRunning];
_isPush = NO;
}
- (void)viewWillDisappear:(BOOL)animated
{
// [super viewWillDisappear:YES];
// if (_readerView.torchMode ==1) {
// _readerView.torchMode =0;
// }
// [self stopTimer];
//
// [_readerView stop];
[super viewWillDisappear:animated];
if (self.capSession) {
[self.capSession stopRunning];
}
[_timer invalidate];
[_preview setAffineTransform:CGAffineTransformMakeScale(1, 1)];
}
- (void)openLight:(UIButton *)btn{
[self dismissViewControllerAnimated:YES completion:^{
}];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end