I am using AVCapture to capture the images from camera.Everything works fine except this issue.
I need the final captured image as same like which is visible in camera.But the image shows more area(which is not like visible in camera).How can i get the same visible image as final stillImageOutput?
Any help would be highly appreciated.
use your view/imageview object name instead of contentScrollview. This will help you to render the view and provide you an image.
for reference:https://charangiri.wordpress.com/2014/09/18/how-to-render-screen-taking-screen-shot-programmatically/
- (UIImage *) createScreenshotOfCompleteScreen
{
UIImage* image = nil;
UIGraphicsBeginImageContext(contentScrollview.contentSize);
{
CGPoint savedContentOffset = contentScrollview.contentOffset;
CGRect savedFrame = contentScrollview.frame;
contentScrollview.contentOffset = CGPointZero;
contentScrollview.frame = CGRectMake(0, 0, contentScrollview.contentSize.width, contentScrollview.contentSize.height);
if ([[NSString versionofiOS] intValue]>=7)
{
[contentScrollview drawViewHierarchyInRect:contentScrollview.bounds afterScreenUpdates:YES];
}
else
{
[contentScrollview.layer renderInContext: UIGraphicsGetCurrentContext()];
}
image = UIGraphicsGetImageFromCurrentImageContext();
contentScrollview.contentOffset = savedContentOffset;
contentScrollview.frame = savedFrame;
}
UIGraphicsEndImageContext();
return image;
}
Related
I have a view controller which have 4 tabs(some tabs include scrollview with multiple views in it). I need to save all the contents of the tabs into 4 pictures. I managed to let each tab return me a UIImage for me to save. However i discovered a problem, if i didn't tap on the tab bar (which is to say didn't manually load them and show them on screen), the tabs can't return me an Image because there is no view for them to take reference to. So my question is, do I preload the tabs-view? If so, how?
If not preload, is there a better workaround?
Part of my codes:
View Controller use this to share:
UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:#[shareText,[_summaryViewController getImageToShare],[_sessionLogViewController getImageToShare] ,[_breakdownViewController getImageToShare],[_skillsViewController getImageToShare]] applicationActivities:nil];
getImageToShare:
-(UIImage*) getImageToShare
{
UIImage *image = nil;
UIGraphicsBeginImageContextWithOptions(self.scrollView.contentSize, NO, 0.0);
{
CGPoint savedContentOffSet = self.scrollView.contentOffset;
CGRect savedFrame = self.scrollView.frame;
self.scrollView.contentOffset = CGPointZero;
self.scrollView.frame = CGRectMake(0, 0, self.scrollView.contentSize.width, self.scrollView.contentSize.height);
[self.scrollView.layer renderInContext:UIGraphicsGetCurrentContext()];
image = [ViewToImage ImageWithView:self.scrollView];
self.scrollView.contentOffset = savedContentOffSet;
self.scrollView.frame = savedFrame;
}
UIGraphicsEndImageContext();
if (image != nil) {
NSLog(#"there is something returned:%#",image);
}else
NSLog(#"nothign is returned");
return image;
}
Nvm, I figured it out, I just need to create copy of the tabs and then make them don't animate and just show the data. Then preload them and use their Image instead.
This is my code:
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
{
// at this point the webView scrolled to the next section
// I save the offset to make the code a little easier to read
CGFloat offset = _webPage.scrollView.contentOffset.y;
UIGraphicsBeginImageContextWithOptions(_webPage.bounds.size, NO, 0);
[_webPage.layer renderInContext:UIGraphicsGetCurrentContext()];
viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);
// if we are not done yet, scroll to next section
if (offset < _webPage.scrollView.contentSize.height)
{
[_webPage.scrollView scrollRectToVisible:CGRectMake(0, _webPage.frame.size.height+offset, _webPage.frame.size.width, _webPage.frame.size.height) animated:YES];
}
}
In which I save an undefined number of screenshots (UIImages) by scrolling the web view. This works, I have in my photo gallery all the parts of the web page.
But I don't want parts, I want ONE long UIImage. So how do I put (one by one?) my UIImages together?
You can write a UIImage category to do that
UIImage+Combine.h
#import <UIKit/UIKit.h>
#interface UIImage (Combine)
+ (UIImage*)imageByCombiningImage:(UIImage*)firstImage withImage:(UIImage*)secondImage;
#end
UIImage+Combine.m
#import "UIImage+Combine.h"
#implementation UIImage (Combine)
+ (UIImage*)imageByCombiningImage:(UIImage*)firstImage withImage:(UIImage*)secondImage {
UIImage *image = nil;
CGSize newImageSize = CGSizeMake(MAX(firstImage.size.width, secondImage.size.width), firstImage.size.height + secondImage.size.height);
if (UIGraphicsBeginImageContextWithOptions != NULL) {
UIGraphicsBeginImageContextWithOptions(newImageSize, NO, [[UIScreen mainScreen] scale]);
} else {
UIGraphicsBeginImageContext(newImageSize);
}
[firstImage drawAtPoint:CGPointMake(roundf((newImageSize.width-firstImage.size.width)/2), 0)];
[secondImage drawAtPoint:CGPointMake(roundf(((newImageSize.width-secondImage.size.width)/2) ),
roundf((newImageSize.height-secondImage.size.height)))];
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
and then you can call the function in your code with:
UIImage *img = [UIImage imageByCombiningImage:image1 withImage:image2];
This will draw a new image that has the width of the biggest of the two images and the height of both images combined. image1 will be at the top position and image2 below that.
Hey guys I'm doing some image editing with UIImagePickerController. Here is some code in imagePickerController:didFinishPickingMediaWithInfo:
UIImage *editedImg = [info objectForKey:UIImagePickerControllerEditedImage];
UIImageView *imgView = [[UIImageView alloc] initWithImage:editedImg];
CGRect imgFrm = imgView.frame;
float rate = imgFrm.size.height / imgFrm.size.width;
imgFrm.size.width = size;
imgFrm.size.height = size * rate;
imgFrm.origin.x = 0;
imgFrm.origin.y = (size - imgFrm.size.height) / 2;
[imgView setFrame:imgFrm];
UIView *cropView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, size, size)];
[cropView setBackgroundColor:[UIColor blackColor]];
[cropView addSubview:imgView];
UIImage *croppedImg = [MyUtil createUIImageFromUIView:cropView];
The above is to set the image in a size*size view and draw a image from a view when the height of the image returned by picker is smaller than size.
Here is the code of createUIImageFromUIView:(UIView*)view :
+ (UIImage *)createUIImageFromUIView:(UIView *)view
{
UIGraphicsBeginImageContextWithOptions(view.frame.size, NO, 2.0);
CGContextRef ctx = UIGraphicsGetCurrentContext();
[view.layer renderInContext:ctx];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return viewImage;
}
My problem is : when debugging, the 'editedImg'(defined in first line) just shows 'nil'. But, the following code works well. I get the corpView(shows 'nil' too) correctly and get cropped image and can encode it to base64 encoded string for sending to server side. I just want to know why the editedImg is nil(returned by [info objectForKey:UIImagePickerControllerEditedImage], but when I choose to print the info in debug mode, the output is not nil in the console)?
The editdImg gets nil, try:
UIImage *editedImg = [info objectForKey:#"UIImagePickerControllerOriginalImage"];
Get file sizeļ¼
- (long long) fileSizeAtPath:(NSString*) filePath{
NSFileManager* manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath:filePath]){
return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
}
return 0;
}
Best wishes!
After some searching I accidentally found this : string value always shows nil in objective-c
This is the reason why I always see 'nil' in debug mode while the code works well.
You can get your cropped image size by
UIImage *croppedImg = [MyUtil createUIImageFromUIView:cropView];
NSData *dataForImage = UIImagePNGRepresentation(croppedImg);
Now you can check length
if (dataForImage.length)
{
}
i am creating app using facebook. if i am trying to upload photo to facebook means i got following message any give idea for solve that
"The provided user_generated photo for an OG action must be at least 480px in both dimensions"
I use a function like follow to get an image with any size.
Original image should big than you wanted.(ps:You can try an image little)
+ (UIImage *)thumbnailWithImageWithoutScale:(UIImage *)image size:(CGSize)wantSize
{
UIImage * targetImage;
if (nil == image) {
targetImage = nil;
}else{
CGSize size = image.size;
CGRect rect;
if (wantSize.width/wantSize.height > size.width/size.height) {
rect.size.width = wantSize.height*size.width/size.height;
rect.size.height = wantSize.height;
rect.origin.x = (wantSize.width - rect.size.width)/2;
rect.origin.y = 0;
} else{
rect.size.width = wantSize.width;
rect.size.height = wantSize.width*size.height/size.width;
rect.origin.x = 0;
rect.origin.y = (wantSize.height - rect.size.height)/2;
}
UIGraphicsBeginImageContext(wantSize);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);
UIRectFill(CGRectMake(0, 0, wantSize.width, wantSize.height));//clear background
[image drawInRect:rect];
targetImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
return targetImage;
}
You must provide a bigger image, with at least 480px width and height.
Your image is apparently smaller than 480px wide or tall. The problem is either that the original image is too small, or you're retrieving it incorrectly. You could, theoretically resize the image to make it bigger, but that will result in pixelation that is probably undesirable.
You should show us how you're retrieving the image. For example, when I want to pick a photo from my library, I'll use the code adapted from Picking an Item from the Photo Library from the Camera Programming Topics for iOS:
UIImagePickerController *mediaUI = [[UIImagePickerController alloc] init];
mediaUI.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
// To instead show the controls to allow user to trim image, set this to YES;
// If no cropping available, set this to NO.
mediaUI.allowsEditing = YES;
mediaUI.delegate = delegate;
And then, you obviously have to implement the didFinishPickingMediaWithInfo:
#pragma mark - UIImagePickerControllerDelegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
UIImage *originalImage, *editedImage, *imageToUse;
// Handle a still image picked from a photo album
if (CFStringCompare ((CFStringRef) mediaType, kUTTypeImage, 0) == kCFCompareEqualTo) {
editedImage = (UIImage *) [info objectForKey:UIImagePickerControllerEditedImage];
originalImage = (UIImage *) [info objectForKey:UIImagePickerControllerOriginalImage];
if (editedImage) {
imageToUse = editedImage;
} else {
imageToUse = originalImage;
}
NSLog(#"image size = %#", NSStringFromCGSize(imageToUse.size));
if (imageToUse.size.width < 480 || imageToUse.size.height < 480)
{
[[[UIAlertView alloc] initWithTitle:nil
message:#"Please select image that is at least 480 x 480"
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil] show];
}
else
{
// do something with imageToUse
}
}
[picker dismissViewControllerAnimated: YES completion:nil];
}
I am very new to objective c and I'm just getting my bearings. I want to do something really simple but it proves to be quite a challenge:
I am trying to display an image into an UIImageView. The image I'm showing is large and I want it scaled down to fit the UIImageView. I tried setting the AspectFit View mode but the image gets displayed to the original size and is clipped by the UIImageView. My code is below:
- (void)changeImages
{
UIImage* img11 = nil;
img11 = [UIImage imageWithContentsOfFile: [[NSBundle mainBundle] pathForResource:#"dog" ofType:#"jpeg"]];
u11.contentMode = UIViewContentModeScaleAspectFit;
u11.image = img11;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self changeImages];
}
Can anyone shed some light on this please?
Thanks!
Hi I would try this...
- (void)changeImages
{
UIImage *img11 = [UIImage imageNamed#"dog.jpeg"];
u11.contentMode = UIViewContentModeScaleAspectFit;
u11.clipsToBounds = YES;
[u11 setImage:img11];
}
- (void)viewWillAppear:animated
{
[super viewWillAppear:animated];
[self changeImages];
}
This will scale the image (up or down) so that it fits inside the imageView. Having clipsToBounds isn't necessary but will stop the image from displaying outside the frame of your imageView.
HTH.
Add to your UIViewController.m:
-(UIImage *)resizeImage:(UIImage *)image imageSize:(CGSize)size
{
UIGraphicsBeginImageContext(size);
[image drawInRect:CGRectMake(0,0,size.width,size.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
// here is the scaled image which has been changed to the size specified
UIGraphicsEndImageContext();
return newImage;
}
Using:
UIImage *image = [UIImage imageNamed:#"image.png"];
CGSize size = CGSizeMake(50, 63); // set the width and height
UIImage *resizedImage = [self resizeImage:image imageSize:size];
I hope it helps.
CGSize size=CGSizeMake(79, 84);//set the width and height
UIGraphicsBeginImageContext(size);
[image drawInRect:CGRectMake(0,0,size.width,size.height)];
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
//here is the scaled image which has been changed to the size specified
UIGraphicsEndImageContext();
This works for sure and don't forget to import QuartzCore FrameWork..
Have a Happy Coding (^_^)....
You can also set View:Mode to Aspect Fit in the Attributes Inspector in Interface Builder
I did the following and it helped
change the mode to "aspect fill" from the default value "Scale to fill"
and add a line of code as follows (I did it in a cell configuration):
cell.photo.clipsToBounds = true
I know this is old but I wanted to add a response based on the Stanford 193p 2017 lecture 11 (around 18:45) and for anyone looking in swift as this is the first search result that showed up for me.
Basically, subclass UIView and make it look like:
class U11: UIView {
var myImage: UIImage? { didSet { setNeedsDisplay() }}
override func draw(_ rect: CGRect) {
myImage?.draw(in: bounds)
}
}
Then set the image with:
func changeImage() {
if let img11 = UIImage(named: "dog.jpeg"){
u11.myImage = img11
}
}
This is super simple and the image takes up the whole space inside of the views bounds.