I am working on an ios application and i have a issue using CALayer it has created a transparent mask on every image i put in the Layer.
Please have a look at the code below :
self.mask = [CALayer layer];
self.mask.contents = CFBridgingRelease(([UIImage imageNamed:#"launch screen.png"].CGImage));
self.mask.bounds = CGRectMake(0, 0, 200, 200);
self.mask.anchorPoint = CGPointMake(0.5, 0.5);
self.mask.position = CGPointMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds));
self.imageView = _imageView;
self.view.layer.mask = self.mask;
Please Refer to this image for example :
http://31.media.tumblr.com/10cc0ba92377a2cba9fb35c9943fd2ca/tumblr_inline_n6zpokNxpC1qh9cw7.gif
Following code i am using for add CALayer into UIScrollView Layer.
UIImage *icon = [UIImage imageNamed:#“testImage”];
CGFloat imageWidth = icon.size.width;
CGFloat imageHeight = icon.size.height;
CGFloat y = 10;
CGFloat x = 10;
CGRect rect = CGRectMake(x, y, imageWidth, imageHeight);
CALayer *imageLayer = [CALayer layer];
imageLayer.frame = rect;
imageLayer.contents = (id)icon.CGImage;
[self.scrollView.layer addSublayer:imageLayer];
Thanks for help.
Please suggest if any other idea you have. like example directly get #3x image from Images.xcassets.
Please read about the contentsScale property on the CALayer class.
It is not automatically set to 3.0 for iPhone6 Plus. The automatic setting only takes place for View classes. You have to manually set it for CALayer class objects.
Is it possible to add a border just on top of a UIView, if so, how please?
I just Testing Bellow few line of Code and it works very nice, just test it in to your Project. hope you'll get your solution easily.
Why to create new View and adding it into your existing view..? For this task simply create one CALayer and add it into your existing UIView's Layer do as following:-
#import <QuartzCore/QuartzCore.h>
- (void)viewDidLoad
{
CALayer *TopBorder = [CALayer layer];
TopBorder.frame = CGRectMake(0.0f, 0.0f, myview.frame.size.width, 3.0f);
TopBorder.backgroundColor = [UIColor redColor].CGColor;
[myview.layer addSublayer:TopBorder];
[super viewDidLoad];
}
and It's Output is:-
i've find solution for me, here's the tricks :
CGSize mainViewSize = self.view.bounds.size;
CGFloat borderWidth = 1;
UIColor *borderColor = [UIColor colorWithRed:37.0/255 green:38.0/255 blue:39.0/255 alpha:1.0];
UIView *topView = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, mainViewSize.width, borderWidth)];
topView.opaque = YES;
topView.backgroundColor = borderColor;
topView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleBottomMargin;
[self.view addSubview:topView];
GilbertOOI's answer in Swift 2:
let topBorder: CALayer = CALayer()
topBorder.frame = CGRectMake(0.0, 0.0, myView.frame.size.width, 3.0)
topBorder.backgroundColor = UIColor.redColor().CGColor
myView.layer.addSublayer(topBorder)
Here's a UIView category that lets you add a layer-back or view-backed border on any side of the UIView: UIView+Borders
GilbertOOI's answer in Swift 4:
let topBorder: CALayer = CALayer()
topBorder.frame = CGRect(x: 0, y: 0, width: myView.frame.size.width, height: 1)
topBorder.backgroundColor = UIColor.purple.cgColor
myView.layer.addSublayer(topBorder)
I created this simple UIView subclass so that it works in Interface Builder and works with constraints:
https://github.com/natrosoft/NAUIViewWithBorders
Here's my blog post about it:
http://natrosoft.com/?p=55
-- Basically just drop in a UIView in Interface Builder and change its class type to NAUIViewWithBorders.
-- Then in your VC's viewDidLoad do something like:
/* For a top border only ———————————————- */
self.myBorderView.borderColorTop = [UIColor redColor];
self.myBorderView..borderWidthsAll = 1.0f;
/* For borders with different colors and widths ————————— */
self.myBorderView.borderWidths = UIEdgeInsetsMake(2.0, 4.0, 6.0, 8.0);
self.myBorderView.borderColorTop = [UIColor blueColor];
self.myBorderView.borderColorRight = [UIColor redColor];
self.myBorderView.borderColorBottom = [UIColor greenColor];
self.myBorderView.borderColorLeft = [UIColor darkGrayColor];
Here's a direct link to the .m file so you can see the implementation: NAUIViewWithBorders.m
There is a demo project as well.
remus' answer in Obj-C:
CALayer *topBorder = [CALayer new];
topBorder.frame = CGRectMake(0.0, 0.0, self.frame.size.width, 3.0);
topBorder.backgroundColor = [UIColor redColor].CGColor;
[myView.layer addSublayer:topBorder];
Swift5:
We will write a separate method to add borders to this view. To add borders to this view we will create two layers with the desired thickness. We will set the frame of these two layers to the top and bottom of the view. We will set the desired background color of the borders on these layers and add these layers as subLayers to the view.
func addTopBorders() {
let thickness: CGFloat = 1.0
let topBorder = CALayer()
topBorder.frame = CGRect(x: 0.0, y: 0.0, width:
self.down_view_outlet.frame.size.width, height: thickness)
topBorder.backgroundColor = UIColor.white.cgColor
down_view_outlet.layer.addSublayer(topBorder)
}
In ActionScript 3 we can apply a mask of to a visual object like this:
SomeVisualObject.mask = maskShapeObject;
How can I achieve similar result in Objective-C? Assume I have two UIImageView objects, I want something like this:
imageView1.mask = imageView2;
How can I use one UIImageView to mask, or clip the shape of, another?
CALayer *maskLayer = [CALayer layer];
UIImage *maskImage = [UIImage imageNamed:#"maskImage.png"];
maskLayer.contents = (id)maskImage.CGImage;
maskLayer.bounds = (CGRect){CGPointZero, maskImage.size};
UIImageView *imageViewToMask = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
imageViewToMask.image = [UIImage imageNamed:#"image2.png"];
imageViewToMask.layer.mask = maskLayer;
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;