Please give ideas for how to crop UIImage on oval shape or circle shape. Please share your ideas.
#import <QuartzCore/QuartzCore.h>
CALayer *imageLayer = YourImageview.layer;
[imageLayer setCornerRadius:5];
[imageLayer setBorderWidth:1];
[imageLayer setMasksToBounds:YES];
by increasing radius it will become more round-able.
As long as the image is a square, you can get a perfect circle by taking half the width as the corner radius:
[imageView.layer setCornerRadius:imageView.frame.size.width/2];
You also need to add
[imageView.layer setMasksToBounds:YES];
Swift 4.2
import QuartzCore
var imageLayer: CALayer? = YourImageview.layer
imageLayer?.cornerRadius = 5
imageLayer?.borderWidth = 1
imageLayer?.masksToBounds = true
I started looking into this a couple of weeks back. I tried all the suggestions here, none of which worked well. In the great tradition of RTFM I went and read Apple's documentation on Quartz 2D Programming and came up with this. Please try it out and let me know how you go.
The code could be fairly easily altered to crop to an elipse, or any other shape defined by a path.
Make sure you include Quartz 2D in your project.
#include <math.h>
+ (UIImage*)circularScaleAndCropImage:(UIImage*)image frame:(CGRect)frame {
// This function returns a newImage, based on image, that has been:
// - scaled to fit in (CGRect) rect
// - and cropped within a circle of radius: rectWidth/2
//Create the bitmap graphics context
UIGraphicsBeginImageContextWithOptions(CGSizeMake(frame.size.width, frame.size.height), NO, 0.0);
CGContextRef context = UIGraphicsGetCurrentContext();
//Get the width and heights
CGFloat imageWidth = image.size.width;
CGFloat imageHeight = image.size.height;
CGFloat rectWidth = frame.size.width;
CGFloat rectHeight = frame.size.height;
//Calculate the scale factor
CGFloat scaleFactorX = rectWidth/imageWidth;
CGFloat scaleFactorY = rectHeight/imageHeight;
//Calculate the centre of the circle
CGFloat imageCentreX = rectWidth/2;
CGFloat imageCentreY = rectHeight/2;
// Create and CLIP to a CIRCULAR Path
// (This could be replaced with any closed path if you want a different shaped clip)
CGFloat radius = rectWidth/2;
CGContextBeginPath (context);
CGContextAddArc (context, imageCentreX, imageCentreY, radius, 0, 2*M_PI, 0);
CGContextClosePath (context);
CGContextClip (context);
//Set the SCALE factor for the graphics context
//All future draw calls will be scaled by this factor
CGContextScaleCTM (context, scaleFactorX, scaleFactorY);
// Draw the IMAGE
CGRect myRect = CGRectMake(0, 0, imageWidth, imageHeight);
[image drawInRect:myRect];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Include the following code in your UIView class replacing "monk2.png" with your own image name.
- (void)drawRect:(CGRect)rect {
UIImage *originalImage = [UIImage imageNamed:[NSString stringWithFormat:#"monk2.png"]];
CGFloat oImageWidth = originalImage.size.width;
CGFloat oImageHeight = originalImage.size.height;
// Draw the original image at the origin
CGRect oRect = CGRectMake(0, 0, oImageWidth, oImageHeight);
[originalImage drawInRect:oRect];
// Set the newRect to half the size of the original image
CGRect newRect = CGRectMake(0, 0, oImageWidth/2, oImageHeight/2);
UIImage *newImage = [self circularScaleAndCropImage:originalImage frame:newRect];
CGFloat nImageWidth = newImage.size.width;
CGFloat nImageHeight = newImage.size.height;
//Draw the scaled and cropped image
CGRect thisRect = CGRectMake(oImageWidth+10, 0, nImageWidth, nImageHeight);
[newImage drawInRect:thisRect];
}
To have imageView in oval shape is not difficult.
You can do the following
UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:yourImageView.bounds];
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.path = path.CGPath;
yourImageView.layer.mask = maskLayer;
If the rect passed to bezierPathWithOvalInRect is Square the image will be cropped to circle.
Swift Code
let path = UIBezierPath(ovalIn: yourImageView.bounds)
let maskLayer = CAShapeLayer()
maskLayer.path = path.cgPath
yourImageView.layer.mask = maskLayer
To make a RoundShape Image
Step1: in .h file
#property (strong, nonatomic) IBOutlet UIImageView *songImage;
Step2: in .m file
- (void)viewDidLoad
{
self.songImage.layer.cornerRadius = self.songImage.frame.size.width / 2;
self.songImage.clipsToBounds = YES;
//To give the Border and Border color of imageview
self.songImage.layer.borderWidth = 1.0f;
self.songImage.layer.borderColor = [UIColor colorWithRed:249/255.0f green:117/255.0f blue:44/255.0f alpha:1.0f].CGColor;
}
OR For Swift
cell.songImage.layer.cornerRadius = cell.songImage.frame.size.width / 2;
cell.songImage.clipsToBounds = true
//To give the Border and Border color of imageview
cell.songImage.layer.borderWidth = 1.0
cell.songImage.layer.borderColor = UIColor(red: 50.0/255, green: 150.0/255, blue: 65.0/255, alpha: 1.0).CGColor
After a long search I found the correct way to circle the image
Download the Support archive file from URL http://vocaro.com/trevor/blog/2009/10/12/resize-a-uiimage-the-right-way/
#import "UIImage+RoundedCorner.h"
#import "UIImage+Resize.h"
Following lines used to resize the image and convert in to round with radius
UIImage *mask = [UIImage imageNamed:#"mask.jpg"];
mask = [mask resizedImage:CGSizeMake(47, 47) interpolationQuality:kCGInterpolationHigh ];
mask = [mask roundedCornerImage:23.5 borderSize:1];
SWIFT
var vwImage = UIImageView(image: UIImage(named: "Btn_PinIt_Normal.png"))
vwImage.frame = CGRectMake(0, 0, 100, 100)
vwImage.layer.cornerRadius = vwImage.frame.size.width/2
If you only need a perfect circle, changing the shape of the UIImageView could help.
Simply add the QuartzCore framework to your project and add these lines of code somewhere in the lifecycle before the imageView is displayed:
#import <QuartzCore/QuartzCore.h>
.
.
.
//to crop your UIImageView to show only a circle
yourImageView.layer.cornerRadius = yourImageView.frame.size.width/2;
yourImageView.clipsToBounds = YES;
Check out CGImageCreateWithMask. Create a mask of your oval shape, then apply it to the image.
you should refer This ...
// Create the image from a png file
UIImage *image = [UIImage imageNamed:#"prgBinary.jpg"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
// Get size of current image
CGSize size = [image size];
// Frame location in view to show original image
[imageView setFrame:CGRectMake(0, 0, size.width, size.height)];
[[self view] addSubview:imageView];
[imageView release];
// Create rectangle that represents a cropped image
// from the middle of the existing image
CGRect rect = CGRectMake(size.width / 4, size.height / 4 ,
(size.width / 2), (size.height / 2)); //oval logic goes here
// Create bitmap image from original image data,
// using rectangle to specify desired crop area
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], rect);
UIImage *img = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
// Create and show the new image from bitmap data
imageView = [[UIImageView alloc] initWithImage:img];
[imageView setFrame:CGRectMake(0, 200, (size.width / 2), (size.height / 2))];
[[self view] addSubview:imageView];
[imageView release];
SWIFT 3 answer comes from #Mohammad Sadiq
let path = UIBezierPath.init(ovalIn: workingImgaeView.bounds)
let maskLayer = CAShapeLayer(layer: layer)
maskLayer.path = path.cgPath
workingImgaeView.layer.mask = maskLayer
This should work,
Try pasting below code in viewDidLoad().
self.myImage.layer.cornerRadius = self.myImage.frame.size.width / 2;
self.myImage.clipsToBounds = YES;
Related
I have an UIImageView (red squares) that will display a UIImage that must be scaled (I can receive images greater or smaller that the UIImageView). After scaling it, the showed part of the UIImage is the center of it.
What I need is to show the part of the image in the blue squares, how can I archive it?
I'm only able to get the image size (height and width), but it display the original size, when it's supposed to be the scaled one.
self.viewIm = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 120, 80)];
self.viewIm.backgroundColor = [UIColor greenColor];
self.viewIm.layer.borderColor = [UIColor redColor].CGColor;
self.viewIm.layer.borderWidth = 5.0;
UIImage *im = [UIImage imageNamed:#"benjen"];
self.viewIm.image = im;
self.viewIm.contentMode = UIViewContentModeScaleAspectFill;
// self.viewim.clipsToBounds = YES;
[self.view addSubview:self.viewIm];
To do what you're trying to do, I'd recommend looking into CALayer's contentsRect property.
Since seeing your answer, I've been trying to work out the proper solution for a while, but the mathematics escapes me because contentsRect:'s x and y parameters seem sort of mysterious... But here's some code that may point you in the right direction...
float imageAspect = self.imageView.image.size.width/self.imageView.image.size.height;
float imageViewAspect = self.imageView.frame.size.width/self.imageView.frame.size.height;
if (imageAspect > imageViewAspect) {
float scaledImageWidth = self.imageView.frame.size.height * imageAspect;
float offsetWidth = -((scaledImageWidth-self.imageView.frame.size.width)/2);
self.imageView.layer.contentsRect = CGRectMake(offsetWidth/self.imageView.frame.size.width, 0.0, 1.0, 1.0);
} else if (imageAspect < imageViewAspect) {
float scaledImageHeight = self.imageView.frame.size.width * imageAspect;
float offsetHeight = ((scaledImageHeight-self.imageView.frame.size.height)/2);
self.imageView.layer.contentsRect = CGRectMake(0.0, offsetHeight/self.imageView.frame.size.height, 1.0, 1.0);
}
Try something like this:
CGRect cropRect = CGRectMake(0,0,200,200);
CGImageRef imageRef = CGImageCreateWithImageInRect([ImageToCrop CGImage],cropRect);
UIImage *image = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
I found a very good approximation on this answer. In that, the category resize the image, and use the center point to crop after that. I adapt it to crop using (0,0) as origin point. As I don't really need a category, I use it as a single method.
- (UIImage *)imageByScalingAndCropping:(UIImage *)image forSize:(CGSize)targetSize {
UIImage *sourceImage = image;
UIImage *newImage = nil;
CGFloat scaleFactor = 0.0;
CGFloat scaledWidth = targetSize.width;
CGFloat scaledHeight = targetSize.height;
if (CGSizeEqualToSize(image.size, targetSize) == NO) {
if ((targetSize.width / image.size.width) > (targetSize.height / image.size.height)) {
scaleFactor = targetSize.width / image.size.width; // scale to fit height
} else {
scaleFactor = targetSize.height / image.size.height; // scale to fit width
}
scaledWidth = image.size.width * scaleFactor;
scaledHeight = image.size.height * scaleFactor;
}
UIGraphicsBeginImageContext(targetSize); // this will crop
CGRect thumbnailRect = CGRectZero;
thumbnailRect.origin = CGPointZero;
thumbnailRect.size.width = scaledWidth;
thumbnailRect.size.height = scaledHeight;
[sourceImage drawInRect:thumbnailRect];
newImage = UIGraphicsGetImageFromCurrentImageContext();
if(newImage == nil) {
NSLog(#"could not scale image");
}
//pop the context to get back to the default
UIGraphicsEndImageContext();
return newImage;
}
And my call is something like this:
self.viewIm = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 120, 80)];
self.viewIm.image = [self imageByScalingAndCropping:[UIImage imageNamed:#"benjen"] forSize:CGSizeMake(120, 80)];
[self.view addSubview:self.viewIm];
I've spent some time on this and finally created a Swift 3.2 solution (based on one of my answers on another thread, as well as one of the answers above). This code only allows for Y translation of the image, but with some tweaks anyone should be able to add horizontal translation as well ;)
let yOffset: CGFloat = 20
myImageView.contentMode = .scaleAspectFill
//scale image to fit the imageView's width (maintaining aspect ratio), but allow control over the image's Y position
UIGraphicsBeginImageContextWithOptions(myImageView.frame.size, myImageView.isOpaque, 0.0)
let ratio = myImage.size.width / myImage.size.height
let newHeight = myImageView.frame.width / ratio
let rect = CGRect(x: 0, y: -yOffset, width: myImageView.frame.width, height: newHeight)
myImage.draw(in: rect)
let newImage = UIGraphicsGetImageFromCurrentImageContext() ?? myImage
UIGraphicsEndImageContext()
//set the new image
myImageView.image = newImage
Now you can adjust how far down or up you need the image to be by changing the yOffset.
There are some answers for objective c but did not find any regarding swift.
I would like to create a dark view with transparent circle in middle so that user can see the subview and interact with it. How can I implement that using swift.
More precisely I'm looking for a result like whatsapp profile picture implementation. There is this transparent circle in the middle and the user can see the picture and scroll for instance.
Thanks for your help guys!
Cyril's answer translated to swift to prevent extra-typing:
func circularOverlayMask() -> UIImage {
let bounds = self.view.bounds
let width = bounds.size.width
let height = bounds.size.height
let diameter = width
let radius = diameter / 2
let center = CGPointMake(width / 2, height / 2)
// Create the image context
UIGraphicsBeginImageContextWithOptions(bounds.size, false, 0)
// Create the bezier paths
let clipPath = UIBezierPath(rect: bounds)
let maskPath = UIBezierPath(ovalInRect: CGRectMake(center.x - radius, center.y - radius, diameter, diameter))
clipPath.appendPath(maskPath)
clipPath.usesEvenOddFillRule = true
clipPath.addClip()
UIColor(white: 0, alpha: 0.5).setFill()
clipPath.fill()
let finalImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()
return finalImage
}
Here is a method I use in my projects to create circular masks (this is not in Swift but easily translatable):
- (UIImage *)circularOverlayMask
{
// Constants
CGRect bounds = self.navigationController.view.bounds;
CGFloat width = bounds.size.width;
CGFloat height = bounds.size.height;
CGFloat diameter = width - (INNER_EDGE_INSETS * 2);
CGFloat radius = diameter / 2;
CGPoint center = CGPointMake(width / 2, height / 2);
// Create the image context
UIGraphicsBeginImageContextWithOptions(bounds.size, NO, 0);
// Create the bezier paths
UIBezierPath *clipPath = [UIBezierPath bezierPathWithRect:bounds];
UIBezierPath *maskPath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(center.x - radius, center.y - radius, diameter, diameter)];
[clipPath appendPath:maskPath];
clipPath.usesEvenOddFillRule = YES;
[clipPath addClip];
[[UIColor colorWithWhite:0 alpha:0.5f] setFill];
[clipPath fill];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return finalImage;
}
I basically create a subview that I add above the image scrollView, like this:
UIImageView *maskView = [[UIImageView alloc] initWithImage:[self overlayMask]];
maskView.userInteractionEnabled = NO;
[self.view insertSubview:maskView aboveSubview:_scrollView];
Hope that helps.
(Originally found in DZNPhotoPickerController)
How may I retrieve the image from imageView sized as it is displayed (given the content mode), and not as it is according to native properties?
Code:
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, WID, WID)];
imageView.center = CGPointMake(point.x, point.y + Y_OFFSET);
imageView.image = [UIImage imageNamed:#"img"];
imageView.contentMode = UIViewContentModeScaleAspectFit;
You have to draw the image again then save it.
// Image frame size
CGSize size = imageView.bounds.size;
// Grab a new CGContext
UIGraphicsBeginImageContextWithOptions(size, false, 0.0);
// Draw the image
[image drawInRect:CGRectMake(0, 0, size.width, size.height)];
// Grab the new image
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
The above code draws the image in the frame, stretched to the bounds. If you want any other modes of how it is drawn, you have to calculate them yourself and put the desired stuff in the "Draw the image" line of code.
For example, for aspect fit, check out this algorithm:
- (CGRect) aspectFittedRect:(CGSize)inSize max:(CGRect)maxRect {
float originalAspectRatio = inSize.width / inSize.height;
float maxAspectRatio = maxRect.size.width / maxRect.size.height;
CGRect newRect = maxRect;
if (originalAspectRatio > maxAspectRatio) { // scale by width
newRect.size.height = maxRect.size.height * inSize.height / inSize.width;
newRect.origin.y += (maxRect.size.height - newRect.size.height)/2.0;
} else {
newRect.size.width = maxRect.size.height * inSize.width / inSize.height;
newRect.origin.x += (maxRect.size.width - newRect.size.width)/2.0;
}
return CGRectIntegral(newRect);
}
Just pass in imageView.image.size as inSize and imageView.bounds as maxRect.
Source:
http://iphonedevsdk.com/forum/iphone-sdk-development-advanced-discussion/15001-aspect-fit-algorithm.html
I'm trying to apply GPUImageMotionBlurFilter to a snapshot of UIView. I want to blur the top and bottom edges of the view too, so I'm leaving a transparent space (insetY) above and below the rect passed to drawViewHierarchyInRect:afterScreenUpdates:. GPUImage seems to ignore the transparency and acts like it was filled with a color a little lighter than -lightGrayColor.
Here's my code (it's in a method in UIView subclass):
CGFloat insetX = 0;
CGFloat insetY = 10;
CGRect snapshotFrame = CGRectInset(self.bounds, -insetX, -insetY);
UIGraphicsBeginImageContextWithOptions(snapshotFrame.size, NO, 0.0f);
[self drawViewHierarchyInRect:CGRectMake(insetX, insetY, CGRectGetWidth(self.frame), CGRectGetHeight(self.frame)) afterScreenUpdates:YES];
UIImage *snapshotImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
GPUImageMotionBlurFilter *motionBlurFilter = [[GPUImageMotionBlurFilter alloc] init];
motionBlurFilter.blurAngle = 90;
motionBlurFilter.blurSize = 20.0f;
UIImage *blurredImage = [motionBlurFilter imageByFilteringImage:snapshotImage];
And here's what I'm getting:
snapshotImage:
blurredImage:
Is what I'm trying to do possible?
I am creating an iPhone app which has image cropping feature. In this, I am getting the photos from the UIImagePickerController and passing it for cropping. There it has a scrollview and the selected image will be added as a subview to the scrollview. And I am using a UIButton for selecting the area for cropping. User can move the button over the imageview and place it anywhere, and when click on CROP button, the area similar to the frame size of the button should be cropped from the imageview.
I used the following code, but it is not returning the actual image.
CGRect clippedRect = CGRectMake(self.scrollView.frame.origin.x+90, self.scrollView.frame.origin.y, self.scrollView.frame.size.width-180, self.scrollView.frame.size.height-220);
CGImageRef imageRef = CGImageCreateWithImageInRect([self.myPhoto CGImage], clippedRect);
UIImage *newImage = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
self.imageView.image = newImage;
also used
- (UIImage *)cropImage:(UIImage *)oldImage {
CGSize imageSize = self.cropFrame.frame.size;
UIGraphicsBeginImageContextWithOptions( CGSizeMake( imageSize.width, imageSize.height), NO, 0.);
[oldImage drawAtPoint:CGPointMake( xPosition, yPosition)
blendMode:kCGBlendModeCopy
alpha:1.];
UIImage *croppedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return croppedImage;
}
but the result image is not the exact image as per the button frame. I am getting the image from another area.
Updated code
- (void)loadPhoto{
CGFloat w = self.myPhoto.size.width;
CGFloat h = self.myPhoto.size.height;
CGRect imageViewFrame = CGRectMake(0.0f, 0.0f, roundf(w / 2.0f), roundf(h / 2.0f));
self.scrollView.contentSize = imageViewFrame.size;
UIImageView *iv = [[UIImageView alloc] initWithFrame:imageViewFrame];
iv.contentMode = UIViewContentModeScaleAspectFit;
iv.image = self.myPhoto;
[self.view addSubview:iv];
self.imageView = iv;
[iv release];
}
CGRect crop;//= CGRectMake(10, 10, 360, 360);
crop.origin.x = self.cropFrame.frame.origin.x;
crop.origin.y = self.cropFrame.frame.origin.y;
crop.size.width = roundf(self.cropFrame.frame.size.width * 2.0f); //self.cropFrame.frame.size.width * 2;
crop.size.height = roundf(self.cropFrame.frame.size.height * 2.0f); //self.cropFrame.frame.size.height * 2;
NSLog(#"Rect: %#", NSStringFromCGRect(crop));
self.imageView.image = [self croppedImage:crop];
- (UIImage *)croppedImage:(CGRect)bounds {
CGImageRef imageRef = CGImageCreateWithImageInRect([self.imageView.image CGImage], bounds);
UIImage *croppedImage = [UIImage imageWithCGImage:imageRef scale:1.0 orientation:self.myPhoto.imageOrientation];
CGImageRelease(imageRef);
return croppedImage;
}
Please help to find a solution.
The iOS has a default feature for cropping images.Try this code.
picker.allowsEditing = YES;
and also check this controller for cropping..this is exactly the one you are looking for I think https://github.com/barrettj/BJImageCropper .Hope this helps you..
Since you are using a scrollView that allows the image to be scrolled, you need to adjust your crop rect to the scrollView's position:
float zoomScale = self.scrollView.zoomScale;
int cropX = (self.scrollView.contentOffset.x-imageView.frame.origin.x)/zoomScale;
int cropY = (self.scrollView.contentOffset.y-imageView.frame.origin.y)/zoomScale;
You could use this crop tool that I made. It essentially gives you an interface to allow the user to select the crop area. I think it is in line with that you are looking for.
https://github.com/nicholjs/BFCropInterface
Believing you have solve this problem. Me too had this when tried cropping functionality
Set image.size as the imageView.size & scrollView.contentSize. Below code will give the rect to crop
cropRect.origin = scrollView.contentOffset;
cropRect.size = scrollView.bounds.size;
cropRect.origin.x /= scrollView.zoomScale;
cropRect.origin.y /= scrollView.zoomScale;
cropRect.size.width /= scrollView.zoomScale;
cropRect.size.height /= scrollView.zoomScale;
If planning to show the full image first on visible rect. Setting the imageView.size & scrollView.contentSize to visible view size will give crop image of some other area. Instead try finding the zoom scale by
CGFloat dxWidth = viewCrop.frame.size.width / imageView.image.size.width;
CGFloat dxHeight = viewCrop.frame.size.height / imageView.image.size.height;
CGFloat zoomScale = fmaxf(dWidth, dHeight)
and apply (if by adding subView then after addSubView)
scrollView.minimumZoomScale = zoomScale; // to disable further zoom-out
[scrollView setZoomScale: zoomScale];