[英]Taking a picture from the camera and show it in a UIImageView
我有一個包含一些字段(名稱,價格,類別)和分段控件的視圖,以及此按鈕用來拍照。
如果我在模擬器上嘗試這個(沒有相機)它可以正常工作:我可以從相機膠卷中選擇圖像,編輯它並返回視圖,這將顯示包含其內容的所有字段。
但是在我的iPhone上,當我在編輯后選擇圖像並返回視圖時,UIImageView的所有字段均為空。
我還嘗試將字段的內容保存在變量中,然后將其放回“ viewWillApper”方法中,但應用程序崩潰。
開始思考下面可能有一些錯誤的方法
編輯
我在這里找到了解決方案。 我為UIImage類定義了一個新方法。 (點擊鏈接獲取更多信息)。
然后,我在UIImageView的框架上進行工作,以使其適應橫向或縱向的新尺寸。
-(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;
}
現在我有了一個新問題! 如果我橫向拍攝照片,然后嘗試縱向拍攝另一張照片,則應用程序崩潰。 我必須發布一些東西嗎?
我有同樣的問題,使用相機時沒有編輯過的圖像,你必須使用原始圖像:
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
...
如果在使用相冊時裁剪,你必須重新裁剪它當然:
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;
}
相機模式也存在裁剪信息,您需要檢查它的行為方式。
裁剪圖像,我認為這可能對您有幫助
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();
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