从相机拍摄照片并在UIImageView中显示

我有一些视野（名称，价格，类别）和分段控制，再加上这个button拍照。
如果我在模拟器（没有相机）上试用它，它可以正常工作：我可以从相机胶卷中select图像，编辑它并返回到视图，这将显示所有的字段与其内容。
但是在我的iphone上，当我编辑后select图像并返回到视图时，所有的字段都是空的，用于UIImageView。
我也尝试将字段的内容保存在variables中，并将其放回到“viewWillApper”方法中，但应用程序崩溃。
开始思考下面可能有什么错误的方法

编辑

我在这里find了解决scheme。 我为UIImage类定义了一个新的方法。 （请点击链接了解更多信息）。
然后，我在UIImageView的框架上工作，以适应新的维度，横向或纵向。

-(IBAction)takePhoto:(id)sender { if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) { self.imgPicker.sourceType = UIImagePickerControllerSourceTypeCamera; self.imgPicker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto; } else { imgPicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; } [self presentModalViewController:self.imgPicker animated:YES]; } -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { [picker dismissModalViewControllerAnimated:YES]; NSDate *date = [NSDate date]; NSString *photoName = [dateFormatter stringFromDate:date]; NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUs erDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; imagePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", photoName]]; UIImage *picture = [info objectForKey:UIImagePickerControllerOriginalImage]; // ---------RESIZE CODE--------- // if (picture.size.width == 1936) { picture = [picture scaleToSize:CGSizeMake(480.0f, 720.0f)]; } else { picture = [picture scaleToSize:CGSizeMake(720.0f, 480.0f)]; } // --------END RESIZE CODE-------- // photoPreview.image = picture; // ---------FRAME CODE--------- // photoPreview.contentMode = UIViewContentModeScaleAspectFit; CGRect frame = photoPreview.frame; if (picture.size.width == 480) { frame.size.width = 111.3; frame.size.height =167; } else { frame.size.width = 167; frame.size.height =111.3; } photoPreview.frame = frame; // --------END FRAME CODE-------- // NSData *webData = UIImagePNGRepresentation(picture); CGImageRelease([picture CGImage]); [webData writeToFile:imagePath atomically:YES]; imgPicker = nil; } 

现在我有一个新的问题！ 如果我在风景中拍摄一张照片，并试图以另一张照片拍摄，则应用会崩溃。 我必须发布一些东西吗？

Answer 1

我有同样的问题，使用相机时没有编辑的图像，您必须使用原始图像：

 originalimage = [editingInfo objectForKey:UIImagePickerControllerOriginalImage]; if ([editingInfo objectForKey:UIImagePickerControllerMediaMetadata]) { // test to chek that the camera was used // especially I fund out htat you then have to rotate the photo ... 

如果在为专辑作专辑的时候裁剪了，那么你必须重新裁剪它：

 if ([editingInfo objectForKey:UIImagePickerControllerCropRect] != nil) { CGRect cropRect = [[editingInfo objectForKey:UIImagePickerControllerCropRect] CGRectValue]; CGImageRef imageRef = CGImageCreateWithImageInRect([originalimage CGImage], cropRect); chosenimage = [UIImage imageWithCGImage:imageRef]; CGImageRelease(imageRef); } else { chosenimage = originalimage; } 

相机模式中也存在剪切信息，您需要检查您希望如何操作。

Answer 2

裁剪图像，我认为这可能会帮助你

 UIImage *croppedImage = [self imageByCropping:photo.image toRect:tempview.frame]; CGSize size = CGSizeMake(croppedImage.size.height, croppedImage.size.width); UIGraphicsBeginImageContext(size); CGPoint pointImg1 = CGPointMake(0,0); [croppedImage drawAtPoint:pointImg1 ]; [[UIImage imageNamed:appDelegete.strImage] drawInRect:CGRectMake(0,532, 150,80) ]; UIImage* result = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); croppedImage = result; UIImageView *mainImageView = [[UIImageView alloc] initWithImage:croppedImage]; CGRect clippedRect = CGRectMake(0, 0, croppedImage.size.width, croppedImage.size.height); CGFloat scaleFactor = 0.5; UIGraphicsBeginImageContext(CGSizeMake(croppedImage.size.width * scaleFactor, croppedImage.size.height * scaleFactor)); CGContextRef currentContext = UIGraphicsGetCurrentContext(); CGContextClipToRect(currentContext, clippedRect); //this will automatically scale any CGImage down/up to the required thumbnail side (length) when the CGImage gets drawn into the context on the next line of code CGContextScaleCTM(currentContext, scaleFactor, scaleFactor); [mainImageView.layer renderInContext:currentContext]; appDelegete.appphoto = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext();