运行 iOS 8.2 的 ipad 中未显示相机答案

【问题标题】：Camera not presenting in ipad running iOS 8.2运行 iOS 8.2 的 ipad 中未显示相机
【发布时间】：2015-09-24 06:29:07
【问题描述】：

我正在开发通用应用程序并想打开相机。现在我可以在 iphone 上使用 UIimagePickerController 打开相机，但在 iPad 上它不起作用。我已经搜索了解决方案并找到了此代码

self.cameraController = [[UIImagePickerController alloc] init];
self.cameraController.sourceType = UIImagePickerControllerSourceTypeCamera;


    self.cameraController.modalPresentationStyle = UIModalPresentationCurrentContext;

self.cameraController.showsCameraControls = NO;
self.cameraController.navigationBarHidden = YES;
self.cameraController.wantsFullScreenLayout = NO;

[self.cameraController setCameraOverlayView:ar_overlayView];
[ar_overlayView setFrame:self.cameraController.view.bounds];

UIViewController *vc = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
if([[[UIDevice currentDevice] systemVersion] floatValue]>=8.0 && UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
    [[NSOperationQueue mainQueue] addOperationWithBlock:^{

        [self presentViewController:self.cameraController animated:YES completion:nil];
    }];

}
else{
    [vc presentViewController:self.cameraController animated:YES completion:nil];
}

还遵循了一些教程，例如

TechnoTopia Post 但没有找到任何运气。我已经在 iphone 5s 上对其进行了测试，并且在其中运行良好，但在 iPad mini 上，相机没有显示。任何帮助将不胜感激！

【问题讨论】：

How to programmatically start front camera of iPad?的可能重复
@gansai 不，它不是重复的，请在标记为重复之前阅读这两个问题。你提到的问题是关于前置摄像头的，这个问题是关于开放式摄像头的。
它不重复任何问题，因为我在打开相机而不是前置相机时遇到问题。

标签： ios iphone ipad uiimagepickercontroller

【解决方案1】：

在 iPad 上试试这个

-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex==0)
{
     [[NSOperationQueue mainQueue] addOperationWithBlock:^{
 UIImagePickerController* picker=[[UIImagePickerController alloc]init];
    picker.delegate=self;
    picker.allowsEditing=YES;
    picker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;
    [self presentViewController:picker animated:YES completion:nil];
     }];
}
else if (buttonIndex==1)
{
     [[NSOperationQueue mainQueue] addOperationWithBlock:^{
 UIImagePickerController* picker=[[UIImagePickerController alloc]init];
    picker.delegate=self;
    picker.allowsEditing=YES;
    picker.sourceType=UIImagePickerControllerSourceTypeCamera;
         [self presentViewController:picker animated:YES completion:nil];}];
}
}

【讨论】：

【解决方案2】：

对于 iPad，您应该这样做：

if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:picker];
[popover presentPopoverFromRect:self.selectedImageView.bounds inView:self.selectedImageView permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
self.popOver = popover;
}else {
[self presentModalViewController:picker animated:YES];
}

.h 文件中声明的位置：

@property (nonatomic, strong) UIPopoverController *popOver;

您应该处理弹出框委托：

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

苹果文档： apple link

它声明：

"通过调用当前活动视图控制器的 presentViewController:animated:completion: 方法呈现用户界面，将您配置的图像选择器控制器作为新的视图控制器传递。在 iPad 上，使用弹出框呈现用户界面。这样做仅当图像选择器控制器的 sourceType 属性设置为 UIImagePickerControllerSourceTypeCamera 时才有效。"

【讨论】：

【解决方案3】：

试试这个代码：

UIImagePickerController *aImgPickerController = [[UIImagePickerController alloc] init];
aImgPickerController.delegate = self;
aImgPickerController.allowsEditing = YES;

aImgPickerController.sourceType = UIImagePickerControllerSourceTypeCamera;

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    [self presentViewController:aImgPickerController animated:NO completion:^{
        NSLog(@"success present picker");
    }];
});

【讨论】：

嘿，我把 presentViewController:animated:NO completion: 放在调度块中有什么用，因为它在 iphone 中工作正常......你能解释一下吗？

【解决方案4】：

- (IBAction)onClickSelectPicture:(id)sender 
{
    if( [UIImagePickerController isCameraDeviceAvailable: UIImagePickerControllerCameraDeviceFront ])
    {
        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        picker.delegate = self;
        picker.allowsEditing = YES;
        picker.sourceType=UIImagePickerControllerSourceTypeCamera;
        picker.cameraDevice=UIImagePickerControllerCameraDeviceFront;
        [self presentViewController:picker animated:YES completion:NULL];
    }
    else
    {
        UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:@"Error"
                                                              message:@"Device has no camera"
                                                             delegate:nil
                                                    cancelButtonTitle:@"OK"
                                                    otherButtonTitles: nil];

        [myAlertView show];
    }
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{

    imgProf = info[UIImagePickerControllerEditedImage];
        [viewNewPhoto setImage:imgProf];

    imgProf = [self imageWithImage:imgProf scaledToSize:CGSizeMake(imgProf.size.width/4, imgProf.size.height/4)];

    if (imgProf == nil)
    {
        imgPhotoString = @"NoPhoto";
    }else
    {
        imgPhotoString = [self getStringFromImage:imgProf];
    }

    [picker dismissViewControllerAnimated:YES completion:NULL];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissViewControllerAnimated:YES completion:NULL];
}

【讨论】：