iOS二維碼掃描
每一步：添加 AVFoundation.framework 庫
General > Linked Frameworks and Libraries
第二步：代碼集成
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
//1. 有個素材
@interface ViewController ()<AVCaptureMetadataOutputObjectsDelegate>
/** 2.輸入設置 采集攝像頭捕捉到的信息 */
@property (nonatomic, strong) AVCaptureDeviceInput *input;
/** 3.輸出設備 解析輸入設備采集到的信息 */
@property (nonatomic, strong) AVCaptureMetadataOutput *output;
/** 4. layer (特殊圖層 能夠展示攝像頭采集到的畫面) 展示輸入設備采集到的信息 */
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *layer;
/** 5.關聯輸入設備和輸出設備 會話 */
@property (nonatomic, strong) AVCaptureSession *session;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
// 點擊掃描二維碼
- (IBAction)click:(id)sender {
// 1.創建輸入設備
// AVMediaTypeVideo 攝像頭
// AVMediaTypeAudio 麥克風
// AVCaptureDeviceInput 輸入設備 default默認後置
// AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSArray *allDevice = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
self.input = [AVCaptureDeviceInput deviceInputWithDevice:[allDevice firstObject] error:nil];
//2. 創建輸出設備
self.output = [[AVCaptureMetadataOutput alloc]init];
//解析 返回的數據
//設置輸出設備的代理 返回解析後的數據
[self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
//3.創建會話
self.session = [[AVCaptureSession alloc]init];
//4.關聯 會話和設備
if ([self.session canAddInput:self.input]) {
[self.session addInput:self.input];
}
if ([self.session canAddOutput:self.output]) {
[self.session addOutput:self.output];
}
//告訴數據類型 AVMetadataObjectTypeQRCode 二維碼
self.output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];
// 掃描框大小 整個屏幕
[self.session setSessionPreset:AVCaptureSessionPreset640x480];
//5.指定layer 的 frame 然後添加到 view上
self.layer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:self.session];
self.layer.frame = self.view.bounds;
[self.view.layer addSublayer:self.layer];
//開啟會話
[self.session startRunning];
}
//掃描出結果後就會調用的方法
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{
AVMetadataMachineReadableCodeObject *objc = [metadataObjects firstObject];
NSString *str = objc.stringValue;
NSLog(@"%@",str);
//停止掃描
[self.session stopRunning];
//移除 layer
[self.layer removeFromSuperlayer];
}
@end
iOS二維碼掃描