一、没有打开权限，直接打开导致闪退
判断权限
` AVAuthorizationStatus videoAuthStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
switch (videoAuthStatus) {
// 已授权
case AVAuthorizationStatusAuthorized:
{
if(permissionGranted){
permissionGranted(YES);
}
}
break;
// 未询问用户是否授权
case AVAuthorizationStatusNotDetermined:
{
// 提示用户授权
[AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
if(permissionGranted){
permissionGranted(granted);
}
}];
}
break;
// 用户拒绝授权或权限受限
case AVAuthorizationStatusRestricted:
case AVAuthorizationStatusDenied:
{
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"请在”设置-隐私-相机”选项中，允许访问你的相机" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"设置" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
UIApplication *app = [UIApplication sharedApplication];
NSURL *settingURL = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
if ([app canOpenURL:settingURL]) {
[app openURL:settingURL];
}
}];
[alertController addAction:cancelAction];
[alertController addAction:okAction];
[controller presentViewController:alertController animated:YES completion:nil];
if(permissionGranted){
permissionGranted(NO);
}
}
break;
default:
break;
}
`
二、手机坏了拍不了照
` if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"该设备不支持拍照" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:nil];
[alertController addAction:cancelAction];
[controller presentViewController:alertController animated:YES completion:nil];
if(permissionGranted){
permissionGranted(NO);
}
return;
} `
三、 不支持扫码或人脸识别
为了统一，我把可支持的类型都丢进去了（最好按需加入）
` NSArray *availableMetadataObjectTypes = metadataOutput.availableMetadataObjectTypes.mutableCopy;
if(![availableMetadataObjectTypes isKindOfClass:NSArray.class] || availableMetadataObjectTypes.count<1 || ![availableMetadataObjectTypes containsObject:AVMetadataObjectTypeQRCode]){
[SDRCommonToolManager_SAAS showInfoWithStatus:@"该手机不支持二维码扫描"];
return;
}
`
四、你要扫码区返回人脸，你要人脸却放回扫码 判断放回类型
`
- (void)captureOutput:(AVCaptureOutput *)output didOutputMetadataObjects:(NSArray< __kindof AVMetadataObject *> *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
// 获取扫一扫结果
if (metadataObjects && metadataObjects.count > 0) {
[self pauseScanning];
NSString *stringValue = nil;
//处理扫描结果
for (AVMetadataMachineReadableCodeObject *metadataObject in metadataObjects) {
if([metadataObject isKindOfClass:AVMetadataMachineReadableCodeObject.class]){//二维码
stringValue = metadataObject.stringValue;
}else if ([metadataObject isKindOfClass:AVMetadataFaceObject.class]){//人脸
}
}
if(stringValue){
if (self.manager.scanDelegate) {
[self.manager.scanDelegate ly_QRCodeScanResultText:stringValue];
}else{
if (self.manager.scanDelegate) {
[self.manager.scanDelegate ly_QRCodeScanResultFail];
}
}
} [self popBack];
}
}
`
