ios - 源类型 1 不可用

Question

我有一个适用于 iPhone 和 iPad 的应用程序，当我尝试在适用于 iPad 的 UIPopoverController 中加载 UIPickerViewController 时，出现异常“Source type 1 not available” .即使使用该设备也会遇到问题。

@try {
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])  {
        UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
        imagePicker.delegate = self;
        imagePicker.allowsEditing = NO;

        self.tempComp = component;
        if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
            [self presentModalViewController:imagePicker animated:YES];
        }else {
            // We are using an iPad
            popoverController=[[UIPopoverController alloc] initWithContentViewController:imagePicker];
            popoverController.delegate = self;

            [popoverController presentPopoverFromRect:component.bounds inView:component permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
        }
    }else{
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Camera Non Disponibile" message:@"La camera non è disponibile" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
        [alert show];
    }
}
@catch (NSException *exception) {
    NSLog(@"Cattura eccezione %@", exception);
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Eccezione" message:[NSString stringWithFormat:@"%@", exception] delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
    [alert show];
}

Answer 1

这是因为你在模拟器上打开相机...因为代码类似于 [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]显然模拟器没有camera...继续发出这样的警报，

 if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

    UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:@"Error"
                                                          message:@"Device has no camera."
                                                         delegate:nil
                                                cancelButtonTitle:@"OK"
                                                otherButtonTitles: nil];

    [myAlertView show];

}
else{
     //other action
}

Swift 3:

if !UIImagePickerController.isSourceTypeAvailable(.camera) {
    let alertController = UIAlertController(title: nil, message: "Device has no camera.", preferredStyle: .alert)

    let okAction = UIAlertAction(title: "Alright", style: .default, handler: { (alert: UIAlertAction!) in
    })

    alertController.addAction(okAction)
    self.present(alertController, animated: true, completion: nil)
} else {
    // Other action
}

不用担心，它会在设备上正常运行!