iOS终于知道为什么有时候打开相机是黑屏了

Posted 2023-01-06 ihoudf

之前写一个相机，发现在有的手机上能够正常启动相机，而有的打开相机是黑屏。多处查询而未果，今天看到友盟微社区的代码，终于知道原因了。其实没有网上说的那么复杂，就是需要看一下在你手机的设置——隐私——相机中，本软件是不是允许访问相机，只要允许就可以正常打开。所以在写代码的时候要判断一下本程序是不是有访问相机的权限。代码如下：

注意：此方法只对ios7以上的系统有用，如果是在ios6的系统的话就直接崩溃了，况且ios6上也没有“设置--隐私--相机” 那一项

 

 

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)

                AVAuthorizationStatus authStatus =  [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
               
                if (authStatus == AVAuthorizationStatusDenied || authStatus == AVAuthorizationStatusRestricted)
               
                    [[[UIAlertView alloc] initWithTitle:nil message:@"本应用无访问相机的权限，如需访问，可在设置中修改" delegate:nil cancelButtonTitle:@"好的" otherButtonTitles:nil, nil] show];
                    return;
               
            else
                ALAuthorizationStatus author = [ALAssetsLibrary authorizationStatus];
                if (author == kCLAuthorizationStatusRestricted || author == kCLAuthorizationStatusDenied)
               
                    [[[UIAlertView alloc] initWithTitle:nil message:@"本应用无访问相机的权限，如需访问，可在设置中修改" delegate:nil cancelButtonTitle:@"好的" otherButtonTitles:nil, nil] show];
                    return;
               
           
            
            if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
                UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
                imagePicker.sourceType =  UIImagePickerControllerSourceTypeCamera;
                imagePicker.delegate = self;
                imagePicker.allowsEditing = YES;
                [self presentViewController:imagePicker animated:YES completion:^
                    
                ];
           
 

-- NORMAL --