ios 二维码扫描和生成

转自https://github.com/kingsic/SGQRCode

#import "SGQRCodeTool.h"//生成二维码
#import "SGQRCode.h"//扫描二维码

UIImageView *imageView2;

//生成二维码

    imageView2 = [[UIImageView alloc]initWithFrame:CGRectMake(kViewWidth / 2 +50, kViewHeight / 2 +50, 50, 50)];
    imageView2.image = [SGQRCodeTool SG_generateWithDefaultQRCodeData:@"https://github.com/kingsic" imageViewWidth:50];
    [self.view addSubview:imageView2];

//二维码识别

将demo中的QRCodeScanningVC和ScanSuccessJumpVC复制进项目

#import "QRCodeScanningVC.h"

-(void)scanningQRCode{
    // 1、 获取摄像设备
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    if (device) {
        AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
        if (status == AVAuthorizationStatusNotDetermined) {
            [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
                if (granted) {
                    dispatch_async(dispatch_get_main_queue(), ^{
                        QRCodeScanningVC *vc = [[QRCodeScanningVC alloc] init];
                        [self.navigationController pushViewController:vc animated:YES];
                    });
                    
                    SGQRCodeLog(@"当前线程 - - %@", [NSThread currentThread]);
                    // 用户第一次同意了访问相机权限
                    SGQRCodeLog(@"用户第一次同意了访问相机权限");
                    
                } else {
                    
                    // 用户第一次拒绝了访问相机权限
                    SGQRCodeLog(@"用户第一次拒绝了访问相机权限");
                }
            }];
        } else if (status == AVAuthorizationStatusAuthorized) { // 用户允许当前应用访问相机
            QRCodeScanningVC *vc = [[QRCodeScanningVC alloc] init];
            [self.navigationController pushViewController:vc animated:YES];
        } else if (status == AVAuthorizationStatusDenied) { // 用户拒绝当前应用访问相机
            UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"⚠️ 警告" message:@"请去-> [设置 - 隐私 - 相机 - SGQRCodeExample] 打开访问开关" preferredStyle:(UIAlertControllerStyleAlert)];
            UIAlertAction *alertA = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction * _Nonnull action) {
                
            }];
            
            [alertC addAction:alertA];
            [self presentViewController:alertC animated:YES completion:nil];
            
        } else if (status == AVAuthorizationStatusRestricted) {
            NSLog(@"因为系统原因, 无法访问相册");
        }
    } else {
        UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"温馨提示" message:@"未检测到您的摄像头" preferredStyle:(UIAlertControllerStyleAlert)];
        UIAlertAction *alertA = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction * _Nonnull action) {
            
        }];
        
        [alertC addAction:alertA];
        [self presentViewController:alertC animated:YES completion:nil];
    }
}