I want to fill image with percentage (e.g. same as rating).
Actually am showing rating image with with float value.
Depend upon float value i need to fill the with particular image.
I got result to fill over all image. But my query is to fill image with percentage value.
My code:
- (void)viewDidLoad
{
[super viewDidLoad];
_ColImgView.image = [self imageNamed:#"star.png" withColor:[UIColor redColor]];
}
- (UIImage *)imageNamed:(NSString *)name withColor:(UIColor *)color
{
// load the image
UIImage *img = [UIImage imageNamed:name];
// begin a new image context, to draw our colored image onto
UIGraphicsBeginImageContext(img.size);
// get a reference to that context we created
CGContextRef context = UIGraphicsGetCurrentContext();
// set the fill color
[color setFill];
// translate/flip the graphics context (for transforming from CG* coords to UI* coords
CGContextTranslateCTM(context, 0, img.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
// set the blend mode to color burn, and the original image
CGContextSetBlendMode(context, kCGBlendModeColorBurn);
CGRect rect = CGRectMake(0, 0, img.size.width, img.size.height);
CGContextDrawImage(context, rect, img.CGImage);
// set a mask that matches the shape of the image, then draw (color burn) a colored rectangle
CGContextClipToMask(context, rect, img.CGImage);
CGContextAddRect(context, rect);
CGContextDrawPath(context,kCGPathFill);
// generate a new UIImage from the graphics context we drew onto
UIImage *coloredImg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//return the color-burned image
return coloredImg;
}
Preview image:
You have to add overlay. Overlay should be under image and image should be png with transparency. To fill overlay with color in specified area you can use code from here:
iOS - Fill bezierPath with multiple colors based on percentage
If I will find free time I will write code for you, but for now I can only explain what you should do.
I want to crop an image with feathered circle. I use this to crop an image but it is only cropped square.
CGImageRef imref = CGImageCreateWithImageInRect([newImage CGImage], faceRect);
newSubImage = [UIImage imageWithCGImage:imref];
What I want is to crop with feather edges? What should I use to achieve it?
This snippet will create a circular cut with feathered edges
The first featherLocations variable is likely the only one you'll need to adjust
- (UIImage *) featheredImageWithImage:(UIImage *) image
{
// Locations of where the feather starts and ends (0 -> 1)
const CGFloat featherLocations[] = {0.9, 1};
UIGraphicsBeginImageContextWithOptions(image.size, NO, image.scale);
CGContextRef ctx = UIGraphicsGetCurrentContext();
// Draw the original image
[image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
// A 'knock-out' gradient is used to generate a feather effect,
// the alpha channel on the colors defines the alpha of the drawn image
NSArray *gradientColors = #[(id)[UIColor colorWithWhite:0 alpha:1].CGColor,
(id)[UIColor colorWithWhite:0 alpha:0].CGColor];
CGGradientRef gradient = CGGradientCreateWithColors(CGImageGetColorSpace(image.CGImage), (__bridge CFArrayRef)gradientColors, featherLocations);
// Because we're changing the draw mode below,
// take a snapshot of the current draw settings so we can reset them after
CGContextSaveGState(ctx);
// The kCGBlendModeDestinationIn blend mode will provide a'knock-out' effect on
// the previously drawn content, using the alpha channels of the gradient's colors
CGContextSetBlendMode(ctx, kCGBlendModeDestinationIn);
const CGPoint gradientCenter = CGPointMake(image.size.width / 2, image.size.height / 2);
// The gradient will start at the center (0) and extend to the closest edge (horizontal or vertical)
const CGFloat startRadius = 0;
const CGFloat endRadius = MIN(image.size.width,
image.size.height) / 2;
// Draw the gradient to eliminate the pixels we don't want
CGContextDrawRadialGradient(ctx, gradient, gradientCenter, startRadius, gradientCenter, endRadius, (kCGGradientDrawsAfterEndLocation));
CGGradientRelease(gradient);
gradient = NULL;
// Finally, restore state
// (note that in this example CGContextSaveGState and CGContextRestoreGState
// are optional because no further drawing happens after this point)
CGContextRestoreGState(ctx);
// Get the UIImage version
UIImage *featheredImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return featheredImage;
}
What about this... first round the image:
//round the image
UIImageView *roundView = [[UIImageView alloc] initWithImage:smallImage];
UIGraphicsBeginImageContextWithOptions(roundView.bounds.size, NO, [UIScreen mainScreen].scale);
[[UIBezierPath bezierPathWithRoundedRect:roundView.bounds
cornerRadius:roundView.frame.size.width/2] addClip];
[smallImage drawInRect:roundView.bounds];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
and then round it again but with a smaller circle and set the bezier path colour again to white but make it semi transparent by adjusting the alpha...
I am having problem understanding the reason for the following method, to return images that are visibly pixelated. I have double checked the size of the image, and it is fine. What's more, without tinting it, the image edges are smooth, and lack pixelation.
The method for tinting image, based on IOS7 ImageView's tintColor property, works fine, however I would love to find out what is wrong with the following code, because it seems to work for everybody but me. Thanks!
- (UIImage *)imageTintedWithColor:(UIColor *)color
{
if (color) {
UIImage *img = self; // The method is a part of UIImage category, hence the "self"
UIGraphicsBeginImageContext(img.size);
// get a reference to that context we created
CGContextRef context = UIGraphicsGetCurrentContext();
// set the fill color
[color setFill];
// translate/flip the graphics context (for transforming from CG* coords to UI* coords
CGContextTranslateCTM(context, 0, img.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
// set the blend mode to color burn, and the original image
CGContextSetBlendMode(context, kCGBlendModeColorBurn);
CGRect rect = CGRectMake(0, 0, img.size.width, img.size.height);
CGContextDrawImage(context, rect, img.CGImage);
// set a mask that matches the shape of the image, then draw (color burn) a colored rectangle
CGContextSetBlendMode(context, kCGBlendModeSourceIn);
CGContextAddRect(context, rect);
CGContextDrawPath(context,kCGPathFill);
// generate a new UIImage from the graphics context we drew onto
UIImage *coloredImg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//return the color-burned image
return coloredImg;
}
return self;
}
Change this line:
UIGraphicsBeginImageContext(img.size);
to:
UIGraphicsBeginImageContextWithOptions(img.size, NO, 0);
If your images will never have an transparency, change the NO to YES.
I am drawing a circle using this code:
CGContextRef contextRef = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(contextRef, 2.0);
CGContextSetStrokeColorWithColor(contextRef, [color CGColor]);
CGRect circlePoint = (CGRectMake(coordsFinal.x, coordsFinal.y, 50.0, 50.0));
CGContextStrokeEllipseInRect(contextRef, circlePoint);
The circle is added on my UIWindow, but I want it to be added in a UIImageView, maintaining the same coordinates as the UIWindow, so if the coordinates are outside the size of the UIImageView, the circle won't be seen. dimply draw the circle instead on the view, in the UIImageView.
You need to actually get an image from your canvas (context) and set that image on your imageview.
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
How can you mask a square image into an image with round corners?
You can use CoreGraphics to create a path for a round rectangle with this code snippet:
static void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth, float ovalHeight)
{
float fw, fh;
if (ovalWidth == 0 || ovalHeight == 0) {
CGContextAddRect(context, rect);
return;
}
CGContextSaveGState(context);
CGContextTranslateCTM (context, CGRectGetMinX(rect), CGRectGetMinY(rect));
CGContextScaleCTM (context, ovalWidth, ovalHeight);
fw = CGRectGetWidth (rect) / ovalWidth;
fh = CGRectGetHeight (rect) / ovalHeight;
CGContextMoveToPoint(context, fw, fh/2);
CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1);
CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1);
CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1);
CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1);
CGContextClosePath(context);
CGContextRestoreGState(context);
}
And then call CGContextClip(context); to clip it to the rectangle path. Now any drawing done, including drawing an image, will be clipped to the round rectangle shape.
As an example, assuming "image" is a UIImage, and this is in a drawRect: method:
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
addRoundedRectToPath(context, self.frame, 10, 10);
CGContextClip(context);
[image drawInRect:self.frame];
CGContextRestoreGState(context);
Here is an even easier method that is available in iPhone 3.0 and up. Every View-based object has an associated layer. Each layer can have a corner radius set, this will give you just what you want:
UIImageView * roundedView = [[UIImageView alloc] initWithImage: [UIImage imageNamed:#"wood.jpg"]];
// Get the Layer of any view
CALayer * layer = [roundedView layer];
[layer setMasksToBounds:YES];
[layer setCornerRadius:10.0];
// You can even add a border
[layer setBorderWidth:4.0];
[layer setBorderColor:[[UIColor blueColor] CGColor]];
To use these methods you might need to add:
#import <QuartzCore/QuartzCore.h>
I realize this is old news but just to boil it down a bit:
There are two possible questions here: (1) how do I apply rounded corners to a UIView (such as a UIImageView), which will be displayed on screen, and (2) how do I mask a square image (that is, a UIImage) to produce a new image with rounded corners.
For (1), the easiest course is to use CoreAnimation and set the view.layer.cornerRadius property
// Because we're using CoreAnimation, we must include QuartzCore.h
// and link QuartzCore.framework in a build phases
#import <QuartzCore/QuartzCore.h>
// start with an image
UIImage * fooImage = [UIImage imageNamed:#"foo.png"];
// put it in a UIImageView
UIView * view = [UIImageView alloc] initWithImage:fooImage];
// round its corners. This mask now applies to the view's layer's *background*
view.layer.cornerRadius = 10.f
// enable masksToBounds, so the mask applies to its foreground, the image
view.layer.masksToBounds = YES;
For (2), the best way is to use the UIKit graphics operations:
// start with an image
UIImage * fooImage = [UIImage imageNamed:#"foo.png"];
CGRect imageRect = CGRectMake(0, 0, fooImage.size.width, fooImage.size.height);
// set the implicit graphics context ("canvas") to a bitmap context for images
UIGraphicsBeginImageContextWithOptions(imageRect.size,NO,0.0);
// create a bezier path defining rounded corners
UIBezierPath * path = [UIBezierPath bezierPathWithRoundedRect:imageRect cornerRadius:10.f];
// use this path for clipping in the implicit context
[path addClip];
// draw the image into the implicit context
[fooImage drawInRect:imageRect];
// save the clipped image from the implicit context into an image
UIImage *maskedImage = UIGraphicsGetImageFromCurrentImageContext();
// cleanup
UIGraphicsEndImageContext();
What's tricky about problem (2) is that you might think you could do the whole operation using the view.layer.mask property in CoreAnimation. But you can't because the CALayer renderInContext: method, which you'd use to generate a UIImage from the masked layer, seems to ignore the mask. Worse, the documentation for renderInContext: doesn't mention this, and only alludes to the behavior for OSX 10.5.
Some further context: the above approach to (2) is using UIKit's wrappers around more basic CoreGraphics functionality. You can do the same thing using the CoreGraphics calls directly – that is what the chosen answer is doing -- but then you need build the rounded rect bezier path manually from curves and lines and you also need to compensate for the fact that CoreGraphics uses a drawing coordinate system which is flipped with respect to UIKit's.
See this Post - Very simple answer
How to set round corners in UI images in iphone
UIImageView * roundedView = [[UIImageView alloc] initWithImage: [UIImage imageNamed:#"wood.jpg"]];
// Get the Layer of any view
CALayer * l = [roundedView layer];
[l setMasksToBounds:YES];
[l setCornerRadius:10.0];
Very simple.
self.profileImageView.layer.cornerRadius = self.profileImageView.frame.size.width / 2;
self.profileImageView.clipsToBounds = YES;
For every view, there is a bundled layer property. So the first line of the above is to set the corner radius of the layer object (i.e. an instance of CALayer class). To make a circular image from a squared image, the radius is set to the half of the width of UIImageView. For instance, if the width of squared image is 100 pixels. The radius is set to 50 pixels. Secondly, you have to set the clipsToBounds property to YES in order to make the layer works.
Both the methods work but the differences shows up depending on where you use it.
For Ex: If you have a table view with the cells showing an image along with other labels, etc., and you use layer to set the cornerRadius, the scrolling will take a big hit. It gets jerky.
I faced this issue when I was using Layer for an image in a table view cell and was trying to figure out the cause of that jerkiness only to find that CALayer was the culprit.
Used the first solution of doing the stuff in drawRect explained by NilObject. That works like a charm with scrolling being smooth as silk.
On the other hand, if you want to use this in static views like popover view, etc., layer is the easiest way to do it.
As I said, both the methods work well just that you need to decide based on where you want to use it.
I use this method.
+ (UIImage *)imageWithColor:(UIColor *)color andSize:(CGSize)size;
{
UIImage *img = nil;
CGRect rect = CGRectMake(0, 0, size.width, size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context,
color.CGColor);
CGContextFillRect(context, rect);
img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
Building off of algal, here are a couple methods that are nice to put in an UIImage category:
- (UIImage *) roundedCornerImageWithRadius:(CGFloat)radius
{
CGRect imageRect = CGRectMake(0, 0, self.size.width, self.size.height);
UIGraphicsBeginImageContextWithOptions(imageRect.size,NO,0.0); //scale 0 yields better results
//create a bezier path defining rounded corners and use it for clippping
UIBezierPath * path = [UIBezierPath bezierPathWithRoundedRect:imageRect cornerRadius:radius];
[path addClip];
// draw the image into the implicit context
[self drawInRect:imageRect];
// get image and cleanup
UIImage *roundedCornerImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return roundedCornerImage;
}
+ (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size andCornerRadius:(CGFloat)radius
{
UIImage *image = nil;
if (size.width == 0 || size.height == 0) {
size = CGSizeMake(1.0, 1.0);
}
CGRect rect = CGRectMake(0.0f, 0.0f, size.width, size.height);
UIGraphicsBeginImageContextWithOptions(rect.size,NO,0.0); //yields sharper results than UIGraphicsBeginImageContext(rect.size)
CGContextRef context = UIGraphicsGetCurrentContext();
if (context)
{
CGContextSetFillColorWithColor(context, [color CGColor]);
if (radius > 0.0) {
//create a bezier path defining rounded corners and use it for clippping
UIBezierPath * path = [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radius];
[path addClip];
CGContextAddPath(context, path.CGPath);
}
CGContextFillRect(context, rect);
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
return image;
}