对原生二维码扫描功能进行封装，轻松使用二维码扫描功能

LXDScanCodeController 扫描控制器，跳转后进入扫描，扫描成功后自动返回
LXDScanView 扫描视图，扫描成功后自动消失

提供了代理和通知两种回调方式，通知只在代理人未实现回调方法的情况下发送通知
LXDScanCodeController 通过LXDScanCodeControllerDelegate代理回调
LXDScanView 通过代理LXDScanViewDelegate回调、通过发送LXDSuccessScanQRCodeNotification通知回调

代理方式 - 通过LXDScanCodeControllerDelegate代理回调
- (void)scanCodeController:(LXDScanCodeController *)scanCodeController codeInfo:(NSString *)codeInfo {
NSURL * url = [NSURL URLWithString: codeInfo];
if ([[UIApplication sharedApplication] canOpenURL: url]) {
[[UIApplication sharedApplication] openURL: url];
} else {
UIAlertView * alertView = [[UIAlertView alloc] initWithTitle: @"警告" message: [NSString stringWithFormat: @"%@:%@", @"无法解析的二维码", codeInfo] delegate: nil cancelButtonTitle: @"确定" otherButtonTitles: nil];
[alertView show];
}
}

代理方式 - 通过代理LXDScanViewDelegate回调
- (void)scanView:(LXDScanView *)scanView codeInfo:(NSString *)codeInfo {
NSURL * url = [NSURL URLWithString: codeInfo];
if ([[UIApplication sharedApplication] canOpenURL: url]) {
[[UIApplication sharedApplication] openURL: url];
} else {
UIAlertView * alertView = [[UIAlertView alloc] initWithTitle: @"警告" message: [NSString stringWithFormat: @"%@:%@", @"无法解析的二维码", codeInfo] delegate: nil cancelButtonTitle: @"确定" otherButtonTitles: nil];
[alertView show];
}
}

通知方式
- (void)receiveScanQRCodeNotification: (NSNotification *)notification {
NSString * codeInfo = [notification.userInfo valueForKey: LXDScanQRCodeMessageKey];
NSURL * url = [NSURL URLWithString: codeInfo];
if ([[UIApplication sharedApplication] canOpenURL: url]) {
[[UIApplication sharedApplication] openURL: url];
} else {
UIAlertView * alertView = [[UIAlertView alloc] initWithTitle: @"警告" message: [NSString stringWithFormat: @"%@:%@", @"无法解析的二维码", codeInfo] delegate: nil cancelButtonTitle: @"确定" otherButtonTitles: nil];
[alertView show];
}
}

控制器跳转
LXDScanCodeController * scanCodeController = [LXDScanCodeController scanCodeController];
scanCodeController.scanDelegate = self;
[self.navigationController pushViewController: scanCodeController animated: YES];

扫描视图使用
LXDScanView * scanView = [LXDScanView scanViewShowInController: self];
scanView.delegate = self;
[self.view addSubview: scanView];
[scanView show];