二维码的生成和使用

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在二维码界面中写一个block来传递必要的参数，部分代码如下

#import <UIKit/UIKit.h>
typedef void(^QRUrlBlock)(NSString *url,NSString* invite_code,BOOL isResist);
@interface QRViewController : UIViewController<UIAlertViewDelegate>
@property (nonatomic, copy) QRUrlBlock qrUrlBlock;
@end

.m文件中调用相机，导入#import <AVFoundation/AVFoundation.h> 遵循AVCaptureMetadataOutputObjectsDelegate 部分代码如下：

@interface QRViewController ()<AVCaptureMetadataOutputObjectsDelegate,QRViewDelegate>

@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

@implementation QRViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor whiteColor];
    _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    
    // Input
    _input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];
    
    // Output
    _output = [[AVCaptureMetadataOutput alloc]init];
    [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    
    // Session
    _session = [[AVCaptureSession alloc]init];
    [_session setSessionPreset:AVCaptureSessionPresetHigh];
    if ([_session canAddInput:self.input])
    {
        [_session addInput:self.input];
    }
    
    if ([_session canAddOutput:self.output])
    {
        [_session addOutput:self.output];
    }
    if([[[UIDevice currentDevice] systemVersion] floatValue]>= 7.0)
    {
        //判断相机是否能够使用
        AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
        if

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