I need to get the dynamic x,y position of the image view.
I have tried this
self.imgView.bounds.origin.y
and
self.imgView.frame.origin.x
I am getting 0.0 all the time.
How can i get this?
Thanks
The bounds.origin of any view should be (0,0) at all times since it is the coordinate system of the view itself (relative to its origin)
The frame.origin is in the coordinate system of the its superview, so if it's 0,0, then that might be that its origin is at its superview's origin.
Maybe you want to know the origin with respect to the screen? If so,
let posInWindow = v.convert(v.bounds.origin, to: nil)
Please use below code to get rect in UIImageVIew
This code in swift3 And your ImageViewContentMode should be Aspect fit
func calculateRectOfImageInImageView(imageView: UIImageView) -> CGRect {
let imageViewSize = imageView.frame.size
let imgSize = imageView.image?.size
guard let imageSize = imgSize, imgSize != nil else {
return CGRect.zero
}
let scaleWidth = imageViewSize.width / imageSize.width
let scaleHeight = imageViewSize.height / imageSize.height
let aspect = fmin(scaleWidth, scaleHeight)
var imageRect = CGRect(x: 0, y: 0, width: imageSize.width * aspect, height: imageSize.height * aspect)
// Center image
imageRect.origin.x = (imageViewSize.width - imageRect.size.width) / 2
imageRect.origin.y = (imageViewSize.height - imageRect.size.height) / 2
// Add imageView offset
imageRect.origin.x += imageView.frame.origin.x
imageRect.origin.y += imageView.frame.origin.y
return imageRect
}
Bounds will always return an x and y of 0, you want to use frame. In your example these values may be correct? Try adding your imageView in the centre of the view and logging the:
self.imgView.frame.origin.x
self.imgView.frame.origin.y
Related
Tried searching for a while but couldn't find a way to do this.
I currently have a uiimage that is aspect fit. I'm trying to overlay a NxN grid of buttons over the image.
My thought process was to find the boundaries of the image in the imageview, and then overlay the buttons based off those boundaries. I usually use storyboards but am taking a stab at this programmatically as I couldn't figure out the aspect fit part in storyboards.
I found this code for finding the boundaries of my image after its been fit and did some print statements to be sure that it is finding the correct boundaries which I believe it is.
extension UIImageView {
var contentClippingRect: CGRect {
guard let image = image else { return bounds }
guard contentMode == .scaleAspectFit else { return bounds }
guard image.size.width > 0 && image.size.height > 0 else { return bounds }
let scale: CGFloat
if image.size.width > image.size.height {
scale = bounds.width / image.size.width
} else {
scale = bounds.height / image.size.height
}
let size = CGSize(width: image.size.width * scale, height: image.size.height * scale)
let x = (bounds.width - size.width) / 2.0
let y = (bounds.height - size.height) / 2.0
return CGRect(x: x, y: y, width: size.width, height: size.height)
}
}
I'm currently trying to initialize the stackview by passing the image.contentRectClipping frame to it. My understanding would be that this would create a frame based off the x,y,width and height and I would be good to go. However it places the stackview in the top left of the imageview and not the actual image. Any guidance would be greatly appreciated.
I want to get original x and y position of UIImage when we set it in UIImageView with scaleAspectFill.
As we know in scaleAspectFill, some of the portion is clipped. So as per my requirement I want to get x and y value (it may be - value I don't know.).
Here is the original image from gallery
Now I am setting this above image to my app view.
So as above situation, I want to get it's hidden x, y position of image which are clipped.
Can any one tell how to get it?
Use following extension
extension UIImageView {
var imageRect: CGRect {
guard let imageSize = self.image?.size else { return self.frame }
let scale = UIScreen.main.scale
let imageWidth = (imageSize.width / scale).rounded()
let frameWidth = self.frame.width.rounded()
let imageHeight = (imageSize.height / scale).rounded()
let frameHeight = self.frame.height.rounded()
let ratio = max(frameWidth / imageWidth, frameHeight / imageHeight)
let newSize = CGSize(width: imageWidth * ratio, height: imageHeight * ratio)
let newOrigin = CGPoint(x: self.center.x - (newSize.width / 2), y: self.center.y - (newSize.height / 2))
return CGRect(origin: newOrigin, size: newSize)
}
}
Usage
let rect = imageView.imageRect
print(rect)
UI Test
let testView = UIView(frame: rect)
testView.backgroundColor = UIColor.red.withAlphaComponent(0.5)
imageView.superview?.addSubview(testView)
Use below extension to find out accurate details of Image in ImageView.
extension UIImageView {
var contentRect: CGRect {
guard let image = image else { return bounds }
guard contentMode == .scaleAspectFit else { return bounds }
guard image.size.width > 0 && image.size.height > 0 else { return bounds }
let scale: CGFloat
if image.size.width > image.size.height {
scale = bounds.width / image.size.width
} else {
scale = bounds.height / image.size.height
}
let size = CGSize(width: image.size.width * scale, height: image.size.height * scale)
let x = (bounds.width - size.width) / 2.0
let y = (bounds.height - size.height) / 2.0
return CGRect(x: x, y: y, width: size.width, height: size.height)
}
}
How to test
let rect = imgTest.contentRect
print("Image rect:", rect)
Reference: https://www.hackingwithswift.com/example-code/uikit/how-to-find-an-aspect-fit-images-size-inside-an-image-view
If you want to show image like it shows in gallery then you can use contraints
"H:|[v0]|" and "V:|[v0]|" and in imageview use .aspectFit
And if you want the image size you can use imageView.image!.size and calculate the amount of image which is getting cut. In aspectFill the width is matched to screenwidth and accordingly the height gets increased. So I guess you can find how how much amount of image is getting cut.
Try this Library ImageCoordinateSpace
I am not sure if it works for you or not, but it has a feature to convert CGPoint from image coordinates to any view coordinates and vice versa.
I'm loading images of various sizes inside an UIImageView. Some one the images come with annotations, each annotation has a unique position in the image. The annotation coordinates are relative to the original image size.
How do I transform the coordinates so the annotation show up at the same position in the UIImageView after resizing?
I could use AVMakeRectWithAspectRatioInsideRect to calculate the new position, but this only works with ScaleAspectFit and not ScaleAspectFill which I must use.
You need to:
calculate the aspectRatio for aspectFill
multiply the x,y coords for your annotation by the aspectRatio
adjust that point by the amount of the image that extends outside the view frame
This is one way to do it (a little verbose, for clarity):
func aspectFillPoint(for point: CGPoint, in view: UIImageView) -> CGPoint {
guard let img = view.image else {
return CGPoint.zero
}
// imgSize will be modified
var imgSize = img.size
let viewSize = view.frame.size
let aspectWidth = viewSize.width / imgSize.width
let aspectHeight = viewSize.height / imgSize.height
// calculate aspectFill ratio
let f = max(aspectWidth, aspectHeight)
// scale imgSize
imgSize.width *= f
imgSize.height *= f
// unless aspect ratio of view is the same as image,
// it will either extend above and below or left and right
// of the view frame
let xOffset = (viewSize.width - imgSize.width) / 2.0
let yOffset = (viewSize.height - imgSize.height) / 2.0
// scale the original point, and adjust for offsets
return CGPoint(
x: (point.x * f) + xOffset,
y: (point.y * f) + yOffset
)
}
Assuming you have an image assigned to theImageView, which is set to .scaleAspectFill, you can call it like this:
let annotationPoint = CGPoint(x: 232, y: 148)
var newPoint = aspectFillPoint(for: annotationPoint, in: theImageView)
// Note: newPoint is relative to the View Bounds, so unless the
// imageView is at 0,0 we need to adjust for position
newPoint.x += theImageView.frame.origin.x
newPoint.y += theImageView.frame.origin.y
I have a UIImageView which shows an UIImage.
The UIImage may change to other UIImage in different size, and the position and the size of the UIImage inside will change according according to it.
My Problem is that i'm trying add a view that will be at the end of the UIImage (which change all the time) and all I can get is the frame of the UIImageView (which stay full screen all the time).
How can i get the "frame" of current showing UIImage ?
Swift 4.2 & 5.0
func calculateRectOfImageInImageView(imageView: UIImageView) -> CGRect {
let imageViewSize = imageView.frame.size
let imgSize = imageView.image?.size
guard let imageSize = imgSize else {
return CGRect.zero
}
let scaleWidth = imageViewSize.width / imageSize.width
let scaleHeight = imageViewSize.height / imageSize.height
let aspect = fmin(scaleWidth, scaleHeight)
var imageRect = CGRect(x: 0, y: 0, width: imageSize.width * aspect, height: imageSize.height * aspect)
// Center image
imageRect.origin.x = (imageViewSize.width - imageRect.size.width) / 2
imageRect.origin.y = (imageViewSize.height - imageRect.size.height) / 2
// Add imageView offset
imageRect.origin.x += imageView.frame.origin.x
imageRect.origin.y += imageView.frame.origin.y
return imageRect
}
Swift 3.0
// MARK: - Create Rect
func calculateRectOfImageInImageView(imageView: UIImageView) -> CGRect {
let imageViewSize = imageView.frame.size
let imgSize = imageView.image?.size
guard let imageSize = imgSize, imgSize != nil else {
return CGRect.zero
}
let scaleWidth = imageViewSize.width / imageSize.width
let scaleHeight = imageViewSize.height / imageSize.height
let aspect = fmin(scaleWidth, scaleHeight)
var imageRect = CGRect(x: 0, y: 0, width: imageSize.width * aspect, height: imageSize.height * aspect)
// Center image
imageRect.origin.x = (imageViewSize.width - imageRect.size.width) / 2
imageRect.origin.y = (imageViewSize.height - imageRect.size.height) / 2
// Add imageView offset
imageRect.origin.x += imageView.frame.origin.x
imageRect.origin.y += imageView.frame.origin.y
return imageRect
}
For Swift < 3.0
Here is the above method in Swift. Again, assuming that contentMode is set to .ScaleAspectFit If there is no image on the given imageView CGRectZero will be returned.
func calculateRectOfImageInImageView(imageView: UIImageView) -> CGRect {
let imageViewSize = imageView.frame.size
let imgSize = imageView.image?.size
guard let imageSize = imgSize where imgSize != nil else {
return CGRectZero
}
let scaleWidth = imageViewSize.width / imageSize.width
let scaleHeight = imageViewSize.height / imageSize.height
let aspect = fmin(scaleWidth, scaleHeight)
var imageRect = CGRect(x: 0, y: 0, width: imageSize.width * aspect, height: imageSize.height * aspect)
// Center image
imageRect.origin.x = (imageViewSize.width - imageRect.size.width) / 2
imageRect.origin.y = (imageViewSize.height - imageRect.size.height) / 2
// Add imageView offset
imageRect.origin.x += imageView.frame.origin.x
imageRect.origin.y += imageView.frame.origin.y
return imageRect
}
The following will answer your question, assuming your UIImageView used UIViewContentModeAspectFit:
You have to regard the image sizing of the image inside UIImageView. This depends on how you set the contentMode. According your description, I assume you are using UIViewContentModeAspectFit. The resulting image will also be centered in the UIImageView so you also have to consider this for the calculation.
-(CGRect )calculateClientRectOfImageInUIImageView:(UIImageView *)imgView
{
CGSize imgViewSize=imgView.frame.size; // Size of UIImageView
CGSize imgSize=imgView.image.size; // Size of the image, currently displayed
// Calculate the aspect, assuming imgView.contentMode==UIViewContentModeScaleAspectFit
CGFloat scaleW = imgViewSize.width / imgSize.width;
CGFloat scaleH = imgViewSize.height / imgSize.height;
CGFloat aspect=fmin(scaleW, scaleH);
CGRect imageRect={ {0,0} , { imgSize.width*=aspect, imgSize.height*=aspect } };
// Note: the above is the same as :
// CGRect imageRect=CGRectMake(0,0,imgSize.width*=aspect,imgSize.height*=aspect) I just like this notation better
// Center image
imageRect.origin.x=(imgViewSize.width-imageRect.size.width)/2;
imageRect.origin.y=(imgViewSize.height-imageRect.size.height)/2;
// Add imageView offset
imageRect.origin.x+=imgView.frame.origin.x;
imageRect.origin.y+=imgView.frame.origin.y;
return(imageRect);
}
For a better illustration of the differences between the three content modes, see below:
I recommend using built in function AVMakeRectWithAspectRatio.
func AVMakeRectWithAspectRatioInsideRect(_ aspectRatio: CGSize, _ boundingRect: CGRect) -> CGRect
Parameters:
aspectRatio:
The width and height ratio (aspect ratio) you want to maintain.
boundingRect:
The bounding rectangle you want to fit into.
Return Value
Returns a scaled CGRect that maintains the aspect ratio specified by aspectRatio that fits within bounding Rect.
let boundingBox = AVMakeRectWithAspectRatioInsideRect(backgroundImage.size, frame)
Based on the wonderfully simple solution from Janusz, here's what I did:
let visibleRect = AVMakeRect(aspectRatio: CGSize(width: image.size.width, height: image.size.height), insideRect: self.frame)
if visibleRect.contains(point) {
// Do something great here...
}
Swift 3.0
I know its quite late but might help someone in future. Its very simple and inbuilt solution provided by iOS. Just need to:
import AVFoundation
let imageRect = AVMakeRect(aspectRatio: image.size, insideRect: self.imageView.bounds)
UIView provides for the "aspect fit" content mode. However, I've subclasses UIView and would like to draw a UIImage using drawInRect with an aspect fit. Is there any way for me to access that functionality without using a UIImageView?
The math for that is a little bit hairy, but fortunately, here's a solution I prepared earlier:
- (UIImage *)imageScaledToSize:(CGSize)size
{
//create drawing context
UIGraphicsBeginImageContextWithOptions(size, NO, 0.0f);
//draw
[self drawInRect:CGRectMake(0.0f, 0.0f, size.width, size.height)];
//capture resultant image
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
- (UIImage *)imageScaledToFitSize:(CGSize)size
{
//calculate rect
CGFloat aspect = self.size.width / self.size.height;
if (size.width / aspect <= size.height)
{
return [self imageScaledToSize:CGSizeMake(size.width, size.width / aspect)];
}
else
{
return [self imageScaledToSize:CGSizeMake(size.height * aspect, size.height)];
}
}
The first function is equivalent to "scale to fill", the second (which calls the first) is equivalent to "aspect fit". These methods were written as a category on UIImage so to use them from within another class you'll need to tweak them by passing the image in as a second parameter (or just make a category on UIImage like I did).
You have to draw in the rect provided by
Swift:
func AVMakeRect(aspectRatio: CGSize, insideRect boundingRect: CGRect) -> CGRect
Objective-C:
CGRect AVMakeRectWithAspectRatioInsideRect(CGSize aspectRatio, CGRect boundingRect);
See doc
The aspect ratio is preserved and the drawing centred.
It works in absolutely all cases.
here's the solution
CGSize imageSize = yourImage.size;
CGSize viewSize = CGSizeMake(450, 340); // size in which you want to draw
float hfactor = imageSize.width / viewSize.width;
float vfactor = imageSize.height / viewSize.height;
float factor = fmax(hfactor, vfactor);
// Divide the size by the greater of the vertical or horizontal shrinkage factor
float newWidth = imageSize.width / factor;
float newHeight = imageSize.height / factor;
CGRect newRect = CGRectMake(xOffset,yOffset, newWidth, newHeight);
[image drawInRect:newRect];
-- courtesy https://stackoverflow.com/a/1703210
another alternative for aspect fit
-(CGSize ) getImageSize :(CGSize )imgViewSize andActualImageSize:(CGSize )actualImageSize {
// imgViewSize = size of view in which image is to be drawn
// actualImageSize = size of image which is to be drawn
CGSize drawImageSize;
if (actualImageSize.height > actualImageSize.width) {
drawImageSize.height = imgViewSize.height;
drawImageSize.width = actualImageSize.width/actualImageSize.height * imgViewSize.height;
}else {
drawImageSize.width = imgViewSize.width;
drawImageSize.height = imgViewSize.width * actualImageSize.height / actualImageSize.width;
}
return drawImageSize;
}
Code for swift 3.0:
func getAspectFitFrame(sizeImgView:CGSize, sizeImage:CGSize) -> CGRect{
let imageSize:CGSize = sizeImage
let viewSize:CGSize = sizeImgView
let hfactor : CGFloat = imageSize.width/viewSize.width
let vfactor : CGFloat = imageSize.height/viewSize.height
let factor : CGFloat = max(hfactor, vfactor)
// Divide the size by the greater of the vertical or horizontal shrinkage factor
let newWidth : CGFloat = imageSize.width / factor
let newHeight : CGFloat = imageSize.height / factor
var x:CGFloat = 0.0
var y:CGFloat = 0.0
if newWidth > newHeight{
y = (sizeImgView.height - newHeight)/2
}
if newHeight > newWidth{
x = (sizeImgView.width - newWidth)/2
}
let newRect:CGRect = CGRect(x: x, y: y, width: newWidth, height: newHeight)
return newRect
}
Here's a helper CGSize extension that you might find useful:
extension CGSize
{
func sizeThatFitsSize(_ aSize: CGSize) -> CGSize
{
let width = min(self.width * aSize.height / self.height, aSize.width)
return CGSize(width: width, height: self.height * width / self.width)
}
}
Then in -drawInRect: implementation one would do the following:
let imageSizeThatFitsViewBounds = self.image.size.sizeThatFitsSize(self.bounds.size)
let imageRectX = (self.bounds.size.width - imageSizeThatFitsViewBounds.width) / 2
let imageRectY = (self.bounds.size.height - imageSizeThatFitsViewBounds.height) / 2
let imageRect = CGRect(origin: CGPoint(x: imageRectX, y: imageRectY), size: imageSizeThatFitsViewBounds)
this might help you, give it a try
UIImage *logoImage = [UIImage imageNamed:#"logo.png"];
float newHeight = ((logoImage.size.height / logoImage.size.width) * 100.0);
CGRect newLogoImageRect = CGRectMake(0, 0, 80.0, newHeight);
[logoImage drawInRect:newLogoImageRect];
specify your maximum height instead of 100.0 and maximum width instead of 80.0
The following will let you determine the size to draw in. You specify the aspect ratio and the bounding size to fit into.
CGSizeAspectFit & CGSizeAspectFill