iOS開發調用相機時出現黑屏的解決辦法（緣由：沒有獲取到相機權限）

 

iOS開發調用相機時出現黑屏的解決辦法（緣由：沒有獲取到相機權限）

在開發過程當中調用系統相機，可是頁面出現黑屏，緣由是本身只進行了部分的相機權限的判斷沒有根據系統的版本判斷，

 

 

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) {
        
        AVAuthorizationStatus authStatus =  [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
        
        if (authStatus == AVAuthorizationStatusDenied || authStatus == AVAuthorizationStatusRestricted)
        {
            UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"打開相機權限" message:nil preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"去設置" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                NSURL * url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
                if([[UIApplication sharedApplication] canOpenURL:url]) {
                    [[UIApplication sharedApplication] openURL:url];
                }
            }];
            UIAlertAction *canleAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
            [alert addAction:okAction];
            [alert addAction:canleAction];
            [self presentViewController:alert animated:YES completion:nil];
            return;
           
        }
    }else{
        ALAuthorizationStatus author = [ALAssetsLibrary authorizationStatus];
        if (author == kCLAuthorizationStatusRestricted || author == kCLAuthorizationStatusDenied)
        {
            UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"打開相機權限" message:nil preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"去設置" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                NSURL * url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
                if([[UIApplication sharedApplication] canOpenURL:url]) {
                    [[UIApplication sharedApplication] openURL:url];
                }
            }];
            UIAlertAction *canleAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
            [alert addAction:okAction];
            [alert addAction:canleAction];
            [self presentViewController:alert animated:YES completion:nil];
            return;
        }
    }