ios原生掃描二維碼功能，中文不亂碼，支持ios7及以上

代碼結構：只須要有EUExIosScanner.h和EUExIosScanner.m，幾張圖片，一個聲音文件，以及引入AVFoundation的framework。 EUExIosScanner.h代碼以下：

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>

@interface EUExIosScanner {
    UIView      *view;
}
@property (nonatomic,retain) UIView     *view;
@property (nonatomic,copy)UIImageView * readLineView;
@property (nonatomic,assign)BOOL is_Anmotion;
@property (nonatomic,assign)BOOL is_AnmotionFinished;

//開啓關閉掃描
- (void)start;
- (void)stop;

- (void)loopDrawLine;//初始化掃描線
@end

EUExIosScanner.m代碼以下：

//
//  EUExIosScanner.m
//  AppCanPlugin
//
//  Created by zhangda on 15/12/17.
//  Copyright © 2015年 zywx. All rights reserved.
//

#import "EUExIosScanner.h"
#import "EUtility.h"
#import <AVFoundation/AVFoundation.h>
#import <AudioToolbox/AudioToolbox.h>

#define DeviceMaxHeight ([UIScreen mainScreen].bounds.size.height)
#define DeviceMaxWidth ([UIScreen mainScreen].bounds.size.width)
#define widthRate DeviceMaxWidth/320

#define contentTitleColorStr @"666666" //正文顏色較深
#define titleColorStr @"00A1EA" //標題欄顏色
#define IOS8 ([[UIDevice currentDevice].systemVersion intValue] >= 8 ? YES : NO)
#define IOS7 ([[UIDevice currentDevice].systemVersion intValue] >= 7 ? YES : NO)

@interface EUExIosScanner () <AVCaptureMetadataOutputObjectsDelegate>

{
    UIView * readview;//二維碼掃描對象
    AVCaptureSession * session;
    
    NSTimer * countTime;
}

@property (nonatomic, strong) CAShapeLayer *overlay;

@property (strong, nonatomic) CIDetector *detector;

@end

@implementation EUExIosScanner
@synthesize view;
-(id) initWithBrwView:(EBrowserView *)eInBrwView{
    self = [super initWithBrwView:eInBrwView];
    if(self){
        
    }
    return self;
}

-(void) open:(NSMutableArray *)array{
    [self InitScan];
}

- (void)didReceiveMemoryWarning {

    // Dispose of any resources that can be recreated.
}

#pragma mark - 返回
- (void)backButtonEvent
{

}

#pragma mark 初始化掃描
- (void)InitScan
{
    
    [self instanceDevice];
    readview.backgroundColor = [UIColor clearColor];
    [EUtility brwView:meBrwView addSubview:readview];
}

//關閉頁面
- (void) closePage
{
    [self stop];
    if (readview) {
        [readview removeFromSuperview];
        if (readview) {
            readview = nil;
        }
        
    }
}

//返回結果
#pragma mark -QRCodeReaderViewDelegate
- (void)readerScanResult:(NSString *)result
{

    [self stop];
    
    //播放掃描二維碼的聲音
    SystemSoundID soundID;
    NSString *strSoundFile = [[NSBundle mainBundle] pathForResource:@"noticeMusic" ofType:@"wav"];
    AudioServicesCreateSystemSoundID((__bridge CFURLRef)[NSURL fileURLWithPath:strSoundFile],&soundID);
    AudioServicesPlaySystemSound(soundID);
    if (readview) {
        [readview removeFromSuperview];
        if (readview) {
            readview = nil;
        }
        
    }
    [self accordingQcode:result];
}

#pragma mark - 掃描結果處理
- (void)accordingQcode:(NSString *)str
{
    [self jsSuccessWithName:@"uexIosScanner.cbOpen" opId:@"234" dataType:0 strData:str];
//    UIAlertView * alertView = [[UIAlertView alloc]initWithTitle:@"掃描結果" message:str delegate:nil cancelButtonTitle:@"肯定" otherButtonTitles:nil, nil];
//    [alertView show];
}


- (void)instanceDevice
{
    readview = [[UIView alloc]initWithFrame:CGRectMake(0, 0, DeviceMaxWidth, DeviceMaxHeight)];
    readview.backgroundColor = [UIColor whiteColor];
    
    //掃描區域
    UIImage *hbImage=[UIImage imageNamed:@"scanscanBg"];
    UIImageView * scanZomeBack=[[UIImageView alloc] init];
    scanZomeBack.backgroundColor = [UIColor clearColor];
    scanZomeBack.layer.borderColor = [UIColor whiteColor].CGColor;
    scanZomeBack.layer.borderWidth = 2.5;
    scanZomeBack.image = hbImage;
    //添加一個背景圖片
    CGRect mImagerect = CGRectMake(60*widthRate, (DeviceMaxHeight-200*widthRate)/2, 200*widthRate, 200*widthRate);
    [scanZomeBack setFrame:mImagerect];
    CGRect scanCrop=[self getScanCrop:mImagerect readerViewBounds:readview.frame];
    [readview addSubview:scanZomeBack];
    
    //獲取攝像設備
    AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    //建立輸入流
    AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
    //建立輸出流
    AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init];
    //設置代理 在主線程裏刷新
    [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    output.rectOfInterest = scanCrop;
    
    //初始化連接對象
    session = [[AVCaptureSession alloc]init];
    //高質量採集率
    [session setSessionPreset:AVCaptureSessionPresetHigh];
    if (input) {
        [session addInput:input];
    }
    if (output) {
        [session addOutput:output];
        //設置掃碼支持的編碼格式(以下設置條形碼和二維碼兼容)
        NSMutableArray *a = [[NSMutableArray alloc] init];
        if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeQRCode]) {
            [a addObject:AVMetadataObjectTypeQRCode];
        }
        if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeEAN13Code]) {
            [a addObject:AVMetadataObjectTypeEAN13Code];
        }
        if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeEAN8Code]) {
            [a addObject:AVMetadataObjectTypeEAN8Code];
        }
        if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeCode128Code]) {
            [a addObject:AVMetadataObjectTypeCode128Code];
        }
        output.metadataObjectTypes=a;
    }
    
    AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayer layerWithSession:session];
    layer.videoGravity=AVLayerVideoGravityResizeAspectFill;
    layer.frame=readview.layer.bounds;
    [readview.layer insertSublayer:layer atIndex:0];
    
    [self setOverlayPickerView:readview];
    [self loopDrawLine];
    //開始捕獲
    [session startRunning];
    
    
}

-(void)loopDrawLine
{
    _is_AnmotionFinished = NO;
    CGRect rect = CGRectMake(60*widthRate, (DeviceMaxHeight-200*widthRate)/2, 200*widthRate, 2);
    if (_readLineView) {
        _readLineView.alpha = 1;
        _readLineView.frame = rect;
    }
    else{
        _readLineView = [[UIImageView alloc] initWithFrame:rect];
        [_readLineView setImage:[UIImage imageNamed:@"scanLine"]];
        [readview addSubview:_readLineView];
    }
    
    [UIView animateWithDuration:1.5 animations:^{
        //修改fream的代碼寫在這裏
        _readLineView.frame =CGRectMake(60*widthRate, (DeviceMaxHeight-200*widthRate)/2+200*widthRate-5, 200*widthRate, 2);
    } completion:^(BOOL finished) {
        if (!_is_Anmotion) {
            [self loopDrawLine];
        }
        _is_AnmotionFinished = YES;
    }];
}

- (void)setOverlayPickerView:(UIView *)reader
{
    
    CGFloat wid = 60*widthRate;
    CGFloat heih = (DeviceMaxHeight-200*widthRate)/2;
    
    //最上部view
    CGFloat alpha = 0.6;
    UIView* upView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, DeviceMaxWidth, 55)];
    upView.backgroundColor = [self colorFromHexRGB:titleColorStr];
    //頭部標題
    UILabel * titleLabel= [[UILabel alloc] init];
    titleLabel.backgroundColor = [UIColor clearColor];
    titleLabel.frame=CGRectMake((DeviceMaxWidth/2)-80, 20, 160, 35);
    titleLabel.textAlignment = NSTextAlignmentCenter;
    titleLabel.textColor=[UIColor whiteColor];
    titleLabel.text=@"請掃描二維碼";
    [upView addSubview:titleLabel];
    //關閉按鈕
    UIButton * closeBtn = [[UIButton alloc] initWithFrame:CGRectMake(5, 20, 60, 35)];
    closeBtn.backgroundColor = [UIColor clearColor];
    [closeBtn setTitle:@"關閉" forState:UIControlStateNormal];// 添加文字
    [closeBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [closeBtn addTarget:self action:@selector(closePage) forControlEvents:UIControlEventTouchUpInside];
    [upView addSubview:closeBtn];
    [reader addSubview:upView];
    
    //中上部view
    UIView* middleView = [[UIView alloc] initWithFrame:CGRectMake(0, 55, DeviceMaxWidth, heih-55)];
    middleView.alpha = alpha;
    middleView.backgroundColor = [self colorFromHexRGB:contentTitleColorStr];
    [reader addSubview:middleView];
    
    //左側的view
    UIView * cLeftView = [[UIView alloc] initWithFrame:CGRectMake(0, heih, wid, 200*widthRate)];
    cLeftView.alpha = alpha;
    cLeftView.backgroundColor = [self colorFromHexRGB:contentTitleColorStr];
    [reader addSubview:cLeftView];
    
    //右側的view
    UIView *rightView = [[UIView alloc] initWithFrame:CGRectMake(DeviceMaxWidth-wid, heih, wid, 200*widthRate)];
    rightView.alpha = alpha;
    rightView.backgroundColor = [self colorFromHexRGB:contentTitleColorStr];
    [reader addSubview:rightView];
    
    //底部view
    UIView * downView = [[UIView alloc] initWithFrame:CGRectMake(0, heih+200*widthRate, DeviceMaxWidth, DeviceMaxHeight - heih-200*widthRate)];
    downView.alpha = alpha;
    downView.backgroundColor = [self colorFromHexRGB:contentTitleColorStr];
    [reader addSubview:downView];
    
    //開關燈button
    UIButton * turnBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    turnBtn.backgroundColor = [UIColor clearColor];
    [turnBtn setBackgroundImage:[UIImage imageNamed:@"lightSelect"] forState:UIControlStateNormal];
    [turnBtn setBackgroundImage:[UIImage imageNamed:@"lightNormal"] forState:UIControlStateSelected];
    turnBtn.frame=CGRectMake((DeviceMaxWidth-50*widthRate)/2, (CGRectGetHeight(downView.frame)-50*widthRate)/2, 50*widthRate, 50*widthRate);
    [turnBtn addTarget:self action:@selector(turnBtnEvent:) forControlEvents:UIControlEventTouchUpInside];
    [downView addSubview:turnBtn];
    
}

- (void)turnBtnEvent:(UIButton *)button_
{
    button_.selected = !button_.selected;
    if (button_.selected) {
        [self turnTorchOn:YES];
    }
    else{
        [self turnTorchOn:NO];
    }
    
}

- (void)turnTorchOn:(bool)on
{
    Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice");
    if (captureDeviceClass != nil) {
        AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
        
        if ([device hasTorch] && [device hasFlash]){
            
            [device lockForConfiguration:nil];
            if (on) {
                [device setTorchMode:AVCaptureTorchModeOn];
                [device setFlashMode:AVCaptureFlashModeOn];
                
            } else {
                [device setTorchMode:AVCaptureTorchModeOff];
                [device setFlashMode:AVCaptureFlashModeOff];
            }
            [device unlockForConfiguration];
        }
    }
}

-(CGRect)getScanCrop:(CGRect)rect readerViewBounds:(CGRect)readerViewBounds
{
    
    CGFloat x,y,width,height;
    
    x = (CGRectGetHeight(readerViewBounds)-CGRectGetHeight(rect))/2/CGRectGetHeight(readerViewBounds);
    y = (CGRectGetWidth(readerViewBounds)-CGRectGetWidth(rect))/2/CGRectGetWidth(readerViewBounds);
    width = CGRectGetHeight(rect)/CGRectGetHeight(readerViewBounds);
    height = CGRectGetWidth(rect)/CGRectGetWidth(readerViewBounds);
    
    return CGRectMake(x, y, width, height);
    
}

- (void)start
{
    [session startRunning];
}

- (void)stop
{
    [session stopRunning];
}

#pragma mark - 掃描結果
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
    if (metadataObjects && metadataObjects.count>0) {
        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex : 0 ];
        //輸出結果並返回
        [self readerScanResult:metadataObject.stringValue];
    }
}

#pragma mark - 顏色
//獲取顏色
- (UIColor *)colorFromHexRGB:(NSString *)inColorString
{
    UIColor *result = nil;
    unsigned int colorCode = 0;
    unsigned char redByte, greenByte, blueByte;
    
    if (nil != inColorString)
    {
        NSScanner *scanner = [NSScanner scannerWithString:inColorString];
        (void) [scanner scanHexInt:&colorCode]; // ignore error
    }
    redByte = (unsigned char) (colorCode >> 16);
    greenByte = (unsigned char) (colorCode >> 8);
    blueByte = (unsigned char) (colorCode); // masks off high bits
    result = [UIColor
              colorWithRed: (float)redByte / 0xff
              green: (float)greenByte/ 0xff
              blue: (float)blueByte / 0xff
              alpha:1.0];
    return result;
}

@end

其中，open爲入口方法，我這裏是寫的是appcan的ios插件，全部有些地方須要微調