原生二维码扫描
#define QRCodeWidth 260.0 //正方形二维码的边长
#define SCREENWidth [UIScreen mainScreen].bounds.size.width
#define SCREENHeight [UIScreen mainScreen].bounds.size.height
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()<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
- (void)viewDidLoad {
[super viewDidLoad];
[self setupMaskView];//设置扫描区域之外的阴影视图
[self setupScanWindowView];//设置扫描二维码区域的视图
[self beginScanning];//开始扫二维码
}
2-1 设置扫描区域之外的阴影视图
- (void)setupMaskView
{
//设置统一的视图颜色和视图的透明度
UIColor *color = [UIColor blackColor];
float alpha = 0.7;
//设置扫描区域外部上部的视图
UIView *topView = [[UIView alloc]init];
topView.frame = CGRectMake(0, 64, SCREENWidth, (SCREENHeight-64-QRCodeWidth)/2.0-64);
topView.backgroundColor = color;
topView.alpha = alpha;
//设置扫描区域外部左边的视图
UIView *leftView = [[UIView alloc]init];
leftView.frame = CGRectMake(0, 64+topView.frame.size.height, (SCREENWidth-QRCodeWidth)/2.0,QRCodeWidth);
leftView.backgroundColor = color;
leftView.alpha = alpha;
//设置扫描区域外部右边的视图
UIView *rightView = [[UIView alloc]init];
rightView.frame = CGRectMake((SCREENWidth-QRCodeWidth)/2.0+QRCodeWidth,64+topView.frame.size.height, (SCREENWidth-QRCodeWidth)/2.0,QRCodeWidth);
rightView.backgroundColor = color;
rightView.alpha = alpha;
//设置扫描区域外部底部的视图
UIView *botView = [[UIView alloc]init];
botView.frame = CGRectMake(0, 64+QRCodeWidth+topView.frame.size.height,SCREENWidth,SCREENHeight-64-QRCodeWidth-topView.frame.size.height);
botView.backgroundColor = color;
botView.alpha = alpha;
//将设置好的扫描二维码区域之外的视图添加到视图图层上
[self.view addSubview:topView];
[self.view addSubview:leftView];
[self.view addSubview:rightView];
[self.view addSubview:botView];
}
2-2 设置扫描二维码区域的视图
- (void)setupScanWindowView
{
//设置扫描区域的位置(考虑导航栏和电池条的高度为64)
UIView *scanWindow = [[UIView alloc]initWithFrame:CGRectMake((SCREENWidth-QRCodeWidth)/2.0,(SCREENHeight-QRCodeWidth-64)/2.0,QRCodeWidth,QRCodeWidth)];
scanWindow.clipsToBounds = YES;
[self.view addSubview:scanWindow];
//设置扫描区域的动画效果
CGFloat scanNetImageViewH = 241;
CGFloat scanNetImageViewW = scanWindow.frame.size.width;
UIImageView *scanNetImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"scan_net"]];
scanNetImageView.frame = CGRectMake(0, -scanNetImageViewH, scanNetImageViewW, scanNetImageViewH);
CABasicAnimation *scanNetAnimation = [CABasicAnimation animation];
scanNetAnimation.keyPath =@"transform.translation.y";
scanNetAnimation.byValue = @(QRCodeWidth);
scanNetAnimation.duration = 1.0;
scanNetAnimation.repeatCount = MAXFLOAT;
[scanNetImageView.layer addAnimation:scanNetAnimation forKey:nil];
[scanWindow addSubview:scanNetImageView];
//设置扫描区域的四个角的边框
CGFloat buttonWH = 18;
UIButton *topLeft = [[UIButton alloc]initWithFrame:CGRectMake(0,0, buttonWH, buttonWH)];
[topLeft setImage:[UIImage imageNamed:@"scan_1"]forState:UIControlStateNormal];
[scanWindow addSubview:topLeft];
UIButton *topRight = [[UIButton alloc]initWithFrame:CGRectMake(QRCodeWidth - buttonWH,0, buttonWH, buttonWH)];
[topRight setImage:[UIImage imageNamed:@"scan_2"]forState:UIControlStateNormal];
[scanWindow addSubview:topRight];
UIButton *bottomLeft = [[UIButton alloc]initWithFrame:CGRectMake(0,QRCodeWidth - buttonWH, buttonWH, buttonWH)];
[bottomLeft setImage:[UIImage imageNamed:@"scan_3"]forState:UIControlStateNormal];
[scanWindow addSubview:bottomLeft];
UIButton *bottomRight = [[UIButton alloc]initWithFrame:CGRectMake(QRCodeWidth-buttonWH,QRCodeWidth-buttonWH, buttonWH, buttonWH)];
[bottomRight setImage:[UIImage imageNamed:@"scan_4"]forState:UIControlStateNormal];
[scanWindow addSubview:bottomRight];
}
2-3 开始扫二维码
-(void)beginScanning
{
//获取摄像设备
AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
//创建输入流
AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
if (!input) return;
//创建输出流
AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init];
//特别注意的地方：有效的扫描区域，定位是以设置的右顶点为原点。屏幕宽所在的那条线为y轴，屏幕高所在的线为x轴
CGFloat x = ((SCREENHeight-QRCodeWidth-64)/2.0)/SCREENHeight;
CGFloat y = ((SCREENWidth-QRCodeWidth)/2.0)/SCREENWidth;
CGFloat width = QRCodeWidth/SCREENHeight;
CGFloat height = QRCodeWidth/SCREENWidth;
output.rectOfInterest = CGRectMake(x, y, width, height);
//设置代理在主线程里刷新
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
//初始化链接对象
_session = [[AVCaptureSession alloc]init];
//高质量采集率
[_session setSessionPreset:AVCaptureSessionPresetHigh];
[_session addInput:input];
[_session addOutput:output];
//设置扫码支持的编码格式(如下设置条形码和二维码兼容)
output.metadataObjectTypes=@[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeEAN8Code,AVMetadataObjectTypeCode128Code];
AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
layer.videoGravity=AVLayerVideoGravityResizeAspectFill;
layer.frame=self.view.layer.bounds;
[self.view.layer insertSublayer:layer atIndex:0];
//开始捕获
[_session startRunning];
}
3.遵守协议
-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
NSString *stringValue;
if (metadataObjects.count >0) {
//停止扫描
[self.session stopRunning];
AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjects objectAtIndex:0];
stringValue = metadataObject.stringValue;
[_session stopRunning];
}else
{
NSLog(@"没数据");
}
}
5.若是报错 -This app has crashed because it attempted to access privacy-sensitive data without a usage description. The app's Info.plist must contain an NSCameraUsageDescription key with a string value explaining to the user how the app uses this data.
是因为没开启相机权限
解决方法：
将info.plist文件以Source Code打开 （右键 选择Open As）
复制粘贴下面 key value即可
<key>NSCameraUsageDescription</key>
<string>cameraDesciption</string>
celan 运行
