iOS項(xiàng)目中添加二維碼功能(集成二維碼功能,即插即用)

題外話:由于項(xiàng)目需要集成掃描二維碼功能,所以我也特意在網(wǎng)上找了一些資料,具體大家都可以通過(guò)Google來(lái)獲取資料.這里就說(shuō)一下我的大體思路

1.話不多說(shuō),先上效果圖(第一次真機(jī)錄制,可能顯示效果不太好,但實(shí)際效果會(huì)比這個(gè)更好).

掃描二維碼.gif

2.基本實(shí)現(xiàn)

2.1掃描二維碼功能是在蘋(píng)果原生的AVFoundation框架實(shí)現(xiàn)的,所以我們需要導(dǎo)入框架:

CE7BADCA-2D82-4D88-91A6-630A7E61AEFA.png

2.2因?yàn)槲覀冃枰_(kāi)啟蘋(píng)果的相機(jī)功能,由于蘋(píng)果的隱私保護(hù)機(jī)制,所以需要進(jìn)行授權(quán)設(shè)置,所以我們添加以下代碼:

- (void)viewDidLoad {
    NSString *mediaType = AVMediaTypeVideo;
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
    if (authStatus == AVAuthorizationStatusDenied) {//關(guān)閉系統(tǒng)權(quán)限
        if (isDevice_IOS8) {
            UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"相機(jī)訪問(wèn)受限" message:@"請(qǐng)?jiān)贗Phone的\"設(shè)置->隱私->相機(jī)\"選項(xiàng)中,允許\"XMSweep\"訪問(wèn)你的照相機(jī)." preferredStyle:UIAlertControllerStyleAlert];
            [alert addAction:[UIAlertAction actionWithTitle:@"好" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
            }]];
            [alert addAction:[UIAlertAction actionWithTitle:@"去設(shè)置" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                if ([self canOpenSystemSettingView]) {
                    [self systemSettingView];
                }
            }]];
            [self presentViewController:alert animated:YES completion:nil];
        }else {
            UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"相機(jī)訪問(wèn)受限" message:@"請(qǐng)?jiān)贗Phone的\"設(shè)置->隱私->相機(jī)\"選項(xiàng)中,允許\"XMSweep\"訪問(wèn)你的照相機(jī)." delegate:nil cancelButtonTitle:@"好的" otherButtonTitles: nil];
            [alert show];
        }
        return;
    }
}
-(BOOL)canOpenSystemSettingView{
    if (isDevice_IOS8) {
        NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        if ([[UIApplication sharedApplication]canOpenURL:url]) {
            return YES;
        }else {
            return NO;
        }
    }else{
        return NO;
    }
}
-(void)systemSettingView{
    if (isDevice_IOS8) {
        NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        if ([[UIApplication sharedApplication]canOpenURL:url]) {
            [[UIApplication sharedApplication]openURL:url];
        }
    }
}

2.2然后我們就可以自己創(chuàng)建一個(gè)控制器來(lái)跳轉(zhuǎn)掃描二維碼功能,同時(shí)我們通過(guò)Block回調(diào)來(lái)得到掃描得到的結(jié)果.

    XMSweepController *sweepVC = [[XMSweepController alloc]init];
    sweepVC.view.alpha = 0;
    AppDelegate *appdelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
    [appdelegate.window.rootViewController addChildViewController:sweepVC];
    [appdelegate.window.rootViewController.view addSubview:sweepVC.view];
    [sweepVC setDidRecoiveBlock:^(NSString *result) {
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"掃描得到的網(wǎng)址:" message:result preferredStyle:UIAlertControllerStyleAlert];
        [alert addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleCancel handler:nil]];
        [self presentViewController:alert animated:YES completion:nil];
        
    }];
    [UIView animateWithDuration:0.3 animations:^{
        sweepVC.view.alpha = 1;
    }];

3.掃描二維碼功能代碼封裝

3.1在.h文件中(因?yàn)樵趻呙瓒S碼的時(shí)候是通過(guò)系統(tǒng)自帶的掃描器,而后面再某一個(gè)方法中我們可以獲取到掃描結(jié)果,所以這里用Block來(lái)傳值是最好的)

#import <UIKit/UIKit.h>
#define IS_VAILABLE_IOS8  ([[[UIDevice currentDevice] systemVersion] intValue] >= 8)

@interface XMSweepController : UIViewController
typedef void (^XMSweepBlock)(NSString *result);
@property(nonatomic,copy)XMSweepBlock didRecoiveBlock;
-(void)setDidRecoiveBlock:(XMSweepBlock)didRecoiveBlock;
@end

3.2在.m文件中(系統(tǒng)掃描二維碼的關(guān)鍵代碼,這里只管復(fù)制黏貼就行了,全都是系統(tǒng)方法,沒(méi)什么好深究)

#import "XMSweepController.h"
#import <AVFoundation/AVFoundation.h>
#import "Masonry.h"
@interface XMSweepController()<AVCaptureMetadataOutputObjectsDelegate,UIAlertViewDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate>
{
    AVCaptureSession *session; //輸入輸出的中間橋梁
    int line_tag;
    UIView *highlightView;
}
@end
@implementation XMSweepController
-(void)viewDidLoad
{
    [super viewDidLoad];
    [self instanceDevice];
}
-(void)instanceDevice
{
    [[UIApplication sharedApplication]setStatusBarStyle:UIStatusBarStyleLightContent animated:YES];
    line_tag = 18;
    
    //獲取攝像設(shè)備
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    //創(chuàng)建輸入流
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
    //創(chuàng)建輸出流
    AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc]init];
    //設(shè)置代理,在主線程刷新
    [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    //初始化連接對(duì)象
    session = [[AVCaptureSession alloc]init];
    //高質(zhì)量采集率
    [session setSessionPreset:AVCaptureSessionPresetHigh];
    if (input) {
        [session addInput:input];
    }
    if (output) {
        [session addOutput:output];
        //設(shè)置掃碼的編碼格式
        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 = self.view.bounds;
    [self.view.layer insertSublayer:layer atIndex:0];
    //創(chuàng)建掃碼頁(yè)面
    [self creatPickerView];
    //監(jiān)聽(tīng)掃碼狀態(tài)
    [session addObserver:self forKeyPath:@"running" options:NSKeyValueObservingOptionNew context:nil];
    //開(kāi)始捕獲
    [session startRunning];
}

3.3而這里我們需要構(gòu)建掃碼的界面(這里我們不需要擔(dān)心控件會(huì)被遮擋的,因?yàn)橄到y(tǒng)掃碼的時(shí)候就會(huì)顯示整一個(gè)攝像頭拍攝的圖像),抽取一個(gè)方法出來(lái),構(gòu)件圖如下

Paste_Image.png

代碼如下:

-(void)creatPickerView
{
    //左側(cè)View
    UIImageView *leftView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 30, self.view.frame.size.height)];
    leftView.alpha = 0.5;
    leftView.backgroundColor = [UIColor blackColor];
    [self.view addSubview:leftView];
    //右側(cè)View
    UIImageView *rightView = [[UIImageView alloc]initWithFrame:CGRectMake(self.view.frame.size.width - 30, 0, 30, self.view.frame.size.height)];
    rightView.alpha = 0.5;
    rightView.backgroundColor = [UIColor blackColor];
    [self.view addSubview:rightView];
    //上部View
    UIImageView *topView = [[UIImageView alloc]initWithFrame:CGRectMake(30, 0, self.view.frame.size.width - 60, (self.view.center.y - (self.view.frame.size.width - 60) / 2))];
    topView.alpha = 0.5;
    topView.backgroundColor = [UIColor blackColor];
    [self.view addSubview:topView];
    //底部View
    UIImageView *bottomView = [[UIImageView alloc]initWithFrame:CGRectMake(30, self.view.center.y + (self.view.frame.size.width - 60)/2, self.view.frame.size.width - 60, self.view.frame.size.height - ((self.view.center.y - (self.view.frame.size.width - 60)/2)))];
    bottomView.backgroundColor = [UIColor blackColor];
    bottomView.alpha = 0.5;
    [self.view addSubview:bottomView];
    //掃描框
    UIImageView *centerView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width - 60, self.view.frame.size.width)];
    centerView.center = self.view.center;
    centerView.backgroundColor = [UIColor clearColor];
    centerView.image = [UIImage imageNamed:@"掃描框"];
    centerView.contentMode = UIViewContentModeScaleAspectFit;
    [self.view addSubview:centerView];
    //掃描線
    UIImageView *lineView = [[UIImageView alloc]initWithFrame:CGRectMake(30, CGRectGetMaxY(topView.frame), self.view.frame.size.width - 60, 2)];
    lineView.tag = line_tag;
    lineView.image = [UIImage imageNamed:@"掃描線"];
    lineView.backgroundColor = [UIColor clearColor];
    lineView.contentMode = UIViewContentModeScaleAspectFill;
    [self.view addSubview:lineView];
    //文字
    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(30, CGRectGetMinY(bottomView.frame), self.view.frame.size.width - 60, 60)];
    label.textAlignment = NSTextAlignmentCenter;
    label.font = [UIFont systemFontOfSize:16];
    label.textColor = [UIColor whiteColor];
    label.text = @"將二維碼放入框內(nèi),即可自動(dòng)掃描";
    label.backgroundColor = [UIColor clearColor];
    [self.view addSubview:label];
    //返回按鈕
    UIButton *backBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    backBtn.frame = CGRectMake(-2, 10, 60, 64);
    [backBtn addTarget:self action:@selector(backToView:) forControlEvents:UIControlEventTouchUpInside];
    [backBtn setImage:[UIImage imageNamed:@"白色返回_想去"] forState:UIControlStateNormal];
    [self.view addSubview:backBtn];
    
    UIImageView *imageV = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"erweima@3x"]];
    imageV.userInteractionEnabled = YES;
    //    imageV.frame = CGRectMake(280, 10, 35, 35);
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(chooseImage)];
    [imageV addGestureRecognizer:tap];
    [self.view addSubview:imageV];
    [imageV mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.view).with.offset(25);
        make.right.equalTo(self.view).with.offset(-15);
        make.size.mas_equalTo(CGSizeMake(35, 35));
    }];
}

3.4然后就是添加動(dòng)畫(huà)效果了(掃碼的時(shí)候掃描線由上到下地移動(dòng)).我們可以在系統(tǒng)監(jiān)聽(tīng)掃碼狀態(tài)的代理方法寫(xiě).

//監(jiān)聽(tīng)掃碼狀態(tài),添加掃碼動(dòng)畫(huà)
-(void)setDidRecoiveBlock:(XMSweepBlock)didRecoiveBlock
{
    _didRecoiveBlock = [didRecoiveBlock copy];  
}
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context
{
    if ([object isKindOfClass:[AVCaptureSession class]]) {
        BOOL isRunning = ((AVCaptureSession *)object).isRunning;
        if (isRunning) {
            //添加動(dòng)畫(huà)
            [self addAnimation];
        }else{
            //移除動(dòng)畫(huà)
            [self removeAnimation];
        }
    }
}
//添加掃碼動(dòng)畫(huà)
-(void)addAnimation{
    UIView *line = [self.view viewWithTag:line_tag];
    line.hidden = NO;
    CABasicAnimation *animation = [self moveTime:2 fromY:[NSNumber numberWithFloat:0] toY:[NSNumber numberWithFloat:self.view.frame.size.width - 60 -2] rep:OPEN_MAX];
    [line.layer addAnimation:animation forKey:@"lineAnimation"];
    
}
//移除掃碼動(dòng)畫(huà)
-(void)removeAnimation{
    UIView *line = [self.view viewWithTag:line_tag];
    [line.layer removeAnimationForKey:@"lineAnimation"];
    line.hidden = YES;
}
-(CABasicAnimation *)moveTime:(float)time fromY:(NSNumber *)fromY toY:(NSNumber *)toY rep:(int)rep
{
    CABasicAnimation *anima = [CABasicAnimation animationWithKeyPath:@"transform.translation.y"];
    [anima setFromValue:fromY];
    [anima setToValue:toY];
    anima.duration = time;
    anima.delegate = self;
    anima.repeatCount = rep;
    //動(dòng)畫(huà)結(jié)束的時(shí)候,保持動(dòng)畫(huà)的最后狀態(tài)
    anima.fillMode = kCAFillModeForwards;
    anima.removedOnCompletion = NO;
    //控制動(dòng)畫(huà)的速度
    anima.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    return anima;
}

3.5這里我們通過(guò)前面定義的Block,設(shè)置相關(guān)的Block方法(獲取到相對(duì)應(yīng)的值),我們?cè)趻叽a得到結(jié)果后,退出當(dāng)前的控制器,且停止系統(tǒng)捕獲信息的方法.

//獲取到掃碼結(jié)果
-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
    if (metadataObjects.count > 0) {
        [session stopRunning];
        AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjects objectAtIndex:0];
        //輸出掃描字符串
        NSString *data = metadataObject.stringValue;
        NSLog(@"我想要得到的數(shù)據(jù)是%@",data);
        if (_didRecoiveBlock) {
            _didRecoiveBlock(data);
            [self removeFromSuperview];
        }
    }
}

//從父視圖移除
-(void)removeFromSuperview
{
    [session removeObserver:self forKeyPath:@"running" context:nil];
    [UIView animateWithDuration:0.3 animations:^{
        self.view.alpha = 0;
    } completion:^(BOOL finished) {
        [self.view removeFromSuperview];
        [self removeFromParentViewController];
    }];
    [[UIApplication sharedApplication]setStatusBarStyle:UIStatusBarStyleDefault animated:YES];
}

4.本地二維碼掃碼功能

4.1其實(shí)實(shí)現(xiàn)原理很簡(jiǎn)單,也是從相冊(cè)選中二維碼照片(單張選取和選中),然后通過(guò)系統(tǒng)的方法獲取掃碼的結(jié)果,最后也是通過(guò)Block來(lái)回調(diào).

-(void)chooseImage
{
    UIImagePickerController *picker = [[UIImagePickerController alloc]init];
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.delegate = self;
    picker.allowsEditing = YES;
    [self presentViewController:picker animated:YES completion:nil];
}
//選中單張照片
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
    [picker dismissViewControllerAnimated:YES completion:nil];
    __block UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
    if (!image) {
        image = [info objectForKey:UIImagePickerControllerOriginalImage];
    }
    //系統(tǒng)自帶的識(shí)別方法
    CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{ CIDetectorAccuracy : CIDetectorAccuracyHigh }];
    CGImageRef ref = (CGImageRef)image.CGImage;
    CIImage *cii = [CIImage imageWithCGImage:ref];
    NSArray *feacture = [detector featuresInImage:cii];
    if (feacture.count >= 1) {
        CIQRCodeFeature *feature = [feacture objectAtIndex:0];
        NSString *scanResult = feature.messageString;
        if (_didRecoiveBlock) {
            self.didRecoiveBlock(scanResult);
            
            [self selfRemoveFromSuperview];
        } else {
            if (IS_VAILABLE_IOS8) {
                UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"掃碼" message:scanResult preferredStyle:UIAlertControllerStyleAlert];
                [alert addAction:[UIAlertAction actionWithTitle:@"好" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
                    [session startRunning];
                }]];
                [self presentViewController:alert animated:YES completion:nil];
            } else {
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"掃碼" message:scanResult delegate:self cancelButtonTitle:@"好" otherButtonTitles:nil];
                [alert show];
            }
        }
    }
}

- (void)selfRemoveFromSuperview{
    [session removeObserver:self forKeyPath:@"running" context:nil];
    [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
        self.view.alpha = 0;
    } completion:^(BOOL finished) {
        [self.view removeFromSuperview];
        [self removeFromParentViewController];
    }];
    [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault animated:YES];
}

寫(xiě)到這里,基本功能都能實(shí)現(xiàn),具體可以根據(jù)自己的需求來(lái)修改.
源碼下載,如果能對(duì)你有用的話,希望能能給個(gè)Star!(^__) 嘻嘻……

最后編輯于：2017.12.03 06:49:24

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