How to make radial gradient to be faded in the middle of view in Objective C












3















enter image description here



I want to make radial gradient view as above attached image but I am not able to make fade in the middle, here is my code for gradient.



CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = view_background.bounds;
gradient.colors = @[(id)[UIColor colorWithRed:0.93 green:0.95 blue:0.22 alpha:1].CGColor, (id)[UIColor colorWithRed:0.08 green:0.42 blue:0.32 alpha:1].CGColor];
gradient.endPoint = CGPointMake(0.0, 0.5);
gradient.startPoint = CGPointMake(0.5, 1.0);
[view_background.layer insertSublayer: gradient atIndex:0];









share|improve this question

























  • Cannot validate it (hence a comment and not an answer) but I guess you have to set gradient.locations = @[@0, @0.5, @1.0];. You can remove start and end points (the default values are left-middle, right-middle which is what you need). As a sidenote, the image posted seems to be a radial gradient, with the center of the yellowish circle at middle-top.

    – Alladinian
    Nov 22 '18 at 12:00













  • i did as you said but gradient.locations = @[@0, @0.5, @1.0]; makes vertical gradient

    – Jack
    Nov 22 '18 at 13:23
















3















enter image description here



I want to make radial gradient view as above attached image but I am not able to make fade in the middle, here is my code for gradient.



CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = view_background.bounds;
gradient.colors = @[(id)[UIColor colorWithRed:0.93 green:0.95 blue:0.22 alpha:1].CGColor, (id)[UIColor colorWithRed:0.08 green:0.42 blue:0.32 alpha:1].CGColor];
gradient.endPoint = CGPointMake(0.0, 0.5);
gradient.startPoint = CGPointMake(0.5, 1.0);
[view_background.layer insertSublayer: gradient atIndex:0];









share|improve this question

























  • Cannot validate it (hence a comment and not an answer) but I guess you have to set gradient.locations = @[@0, @0.5, @1.0];. You can remove start and end points (the default values are left-middle, right-middle which is what you need). As a sidenote, the image posted seems to be a radial gradient, with the center of the yellowish circle at middle-top.

    – Alladinian
    Nov 22 '18 at 12:00













  • i did as you said but gradient.locations = @[@0, @0.5, @1.0]; makes vertical gradient

    – Jack
    Nov 22 '18 at 13:23














3












3








3


1






enter image description here



I want to make radial gradient view as above attached image but I am not able to make fade in the middle, here is my code for gradient.



CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = view_background.bounds;
gradient.colors = @[(id)[UIColor colorWithRed:0.93 green:0.95 blue:0.22 alpha:1].CGColor, (id)[UIColor colorWithRed:0.08 green:0.42 blue:0.32 alpha:1].CGColor];
gradient.endPoint = CGPointMake(0.0, 0.5);
gradient.startPoint = CGPointMake(0.5, 1.0);
[view_background.layer insertSublayer: gradient atIndex:0];









share|improve this question
















enter image description here



I want to make radial gradient view as above attached image but I am not able to make fade in the middle, here is my code for gradient.



CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = view_background.bounds;
gradient.colors = @[(id)[UIColor colorWithRed:0.93 green:0.95 blue:0.22 alpha:1].CGColor, (id)[UIColor colorWithRed:0.08 green:0.42 blue:0.32 alpha:1].CGColor];
gradient.endPoint = CGPointMake(0.0, 0.5);
gradient.startPoint = CGPointMake(0.5, 1.0);
[view_background.layer insertSublayer: gradient atIndex:0];






ios objective-c gradient cagradientlayer






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 23 '18 at 5:46









Sateesh

2,1171819




2,1171819










asked Nov 22 '18 at 7:24









JackJack

536




536













  • Cannot validate it (hence a comment and not an answer) but I guess you have to set gradient.locations = @[@0, @0.5, @1.0];. You can remove start and end points (the default values are left-middle, right-middle which is what you need). As a sidenote, the image posted seems to be a radial gradient, with the center of the yellowish circle at middle-top.

    – Alladinian
    Nov 22 '18 at 12:00













  • i did as you said but gradient.locations = @[@0, @0.5, @1.0]; makes vertical gradient

    – Jack
    Nov 22 '18 at 13:23



















  • Cannot validate it (hence a comment and not an answer) but I guess you have to set gradient.locations = @[@0, @0.5, @1.0];. You can remove start and end points (the default values are left-middle, right-middle which is what you need). As a sidenote, the image posted seems to be a radial gradient, with the center of the yellowish circle at middle-top.

    – Alladinian
    Nov 22 '18 at 12:00













  • i did as you said but gradient.locations = @[@0, @0.5, @1.0]; makes vertical gradient

    – Jack
    Nov 22 '18 at 13:23

















Cannot validate it (hence a comment and not an answer) but I guess you have to set gradient.locations = @[@0, @0.5, @1.0];. You can remove start and end points (the default values are left-middle, right-middle which is what you need). As a sidenote, the image posted seems to be a radial gradient, with the center of the yellowish circle at middle-top.

– Alladinian
Nov 22 '18 at 12:00







Cannot validate it (hence a comment and not an answer) but I guess you have to set gradient.locations = @[@0, @0.5, @1.0];. You can remove start and end points (the default values are left-middle, right-middle which is what you need). As a sidenote, the image posted seems to be a radial gradient, with the center of the yellowish circle at middle-top.

– Alladinian
Nov 22 '18 at 12:00















i did as you said but gradient.locations = @[@0, @0.5, @1.0]; makes vertical gradient

– Jack
Nov 22 '18 at 13:23





i did as you said but gradient.locations = @[@0, @0.5, @1.0]; makes vertical gradient

– Jack
Nov 22 '18 at 13:23












1 Answer
1






active

oldest

votes


















3














Try the code below. Make RadialGradientView as IBDesignable.



RadialGradientView.h



#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

IB_DESIGNABLE
@interface RadialGradientView : UIView

@end

NS_ASSUME_NONNULL_END


RadialGradientView.m



#import "RadialGradientView.h"
#import <CoreGraphics/CoreGraphics.h>

@implementation RadialGradientView

- (void)drawRect:(CGRect)rect {
// Drawing code

UIColor* radialColor = [[UIColor colorWithRed:0.93 green:0.95 blue:0.22 alpha:1] CGColor];
UIColor* outerColor = [[UIColor colorWithRed:0.08 green:0.42 blue:0.32 alpha:1] CGColor];

[self.layer setCornerRadius: 10.0];
[self.layer setMasksToBounds:YES];

NSArray* colors = [[NSArray alloc] initWithObjects: radialColor, outerColor, nil];
CGFloat endRadius = sqrt(pow(self.frame.size.width / 1.9, 2) + pow(self.frame.size.height / 1.9, 2));
CGPoint startCenter = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 12);
CGPoint center = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 2);
CGGradientRef gradient = CGGradientCreateWithColors(nil, (CFArrayRef)colors, nil);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextDrawRadialGradient(context, gradient, startCenter, 0.0, center, endRadius, 0);
}


@end


Swift



@IBDesignable class RadialGradientView: UIView {

@IBInspectable var radialColor: UIColor = UIColor(red: 0.93, green: 0.95, blue: 0.22, alpha: 1.0)
@IBInspectable var outerColor: UIColor = UIColor(red: 0.08, green: 0.42, blue: 0.32, alpha: 1.0)

override func draw(_ rect: CGRect) {

layer.cornerRadius = 10.0
layer.masksToBounds = true

let colors = [radialColor.cgColor, outerColor.cgColor]
let endRadius = sqrt(pow(frame.width/1.9, 2) + pow(frame.height/1.9, 2))
let startCenter = CGPoint(x: bounds.size.width / 2, y: bounds.size.height / 12)
let center = CGPoint(x: bounds.size.width / 2, y: bounds.size.height / 2)
let gradient = CGGradient(colorsSpace: nil, colors: colors as CFArray, locations: nil)
let context = UIGraphicsGetCurrentContext()

context?.drawRadialGradient(gradient!, startCenter: startCenter, startRadius: 0.0, endCenter: center, endRadius: endRadius, options: CGGradientDrawingOptions.drawsBeforeStartLocation)
}
}


Screenshot



enter image description here






share|improve this answer
























  • thanks worked nice)

    – Jack
    Nov 22 '18 at 13:53











  • Glad to help you Jack 😀

    – Sateesh
    Nov 22 '18 at 13:57











Your Answer






StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});














draft saved

draft discarded


















StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53425773%2fhow-to-make-radial-gradient-to-be-faded-in-the-middle-of-view-in-objective-c%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown

























1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









3














Try the code below. Make RadialGradientView as IBDesignable.



RadialGradientView.h



#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

IB_DESIGNABLE
@interface RadialGradientView : UIView

@end

NS_ASSUME_NONNULL_END


RadialGradientView.m



#import "RadialGradientView.h"
#import <CoreGraphics/CoreGraphics.h>

@implementation RadialGradientView

- (void)drawRect:(CGRect)rect {
// Drawing code

UIColor* radialColor = [[UIColor colorWithRed:0.93 green:0.95 blue:0.22 alpha:1] CGColor];
UIColor* outerColor = [[UIColor colorWithRed:0.08 green:0.42 blue:0.32 alpha:1] CGColor];

[self.layer setCornerRadius: 10.0];
[self.layer setMasksToBounds:YES];

NSArray* colors = [[NSArray alloc] initWithObjects: radialColor, outerColor, nil];
CGFloat endRadius = sqrt(pow(self.frame.size.width / 1.9, 2) + pow(self.frame.size.height / 1.9, 2));
CGPoint startCenter = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 12);
CGPoint center = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 2);
CGGradientRef gradient = CGGradientCreateWithColors(nil, (CFArrayRef)colors, nil);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextDrawRadialGradient(context, gradient, startCenter, 0.0, center, endRadius, 0);
}


@end


Swift



@IBDesignable class RadialGradientView: UIView {

@IBInspectable var radialColor: UIColor = UIColor(red: 0.93, green: 0.95, blue: 0.22, alpha: 1.0)
@IBInspectable var outerColor: UIColor = UIColor(red: 0.08, green: 0.42, blue: 0.32, alpha: 1.0)

override func draw(_ rect: CGRect) {

layer.cornerRadius = 10.0
layer.masksToBounds = true

let colors = [radialColor.cgColor, outerColor.cgColor]
let endRadius = sqrt(pow(frame.width/1.9, 2) + pow(frame.height/1.9, 2))
let startCenter = CGPoint(x: bounds.size.width / 2, y: bounds.size.height / 12)
let center = CGPoint(x: bounds.size.width / 2, y: bounds.size.height / 2)
let gradient = CGGradient(colorsSpace: nil, colors: colors as CFArray, locations: nil)
let context = UIGraphicsGetCurrentContext()

context?.drawRadialGradient(gradient!, startCenter: startCenter, startRadius: 0.0, endCenter: center, endRadius: endRadius, options: CGGradientDrawingOptions.drawsBeforeStartLocation)
}
}


Screenshot



enter image description here






share|improve this answer
























  • thanks worked nice)

    – Jack
    Nov 22 '18 at 13:53











  • Glad to help you Jack 😀

    – Sateesh
    Nov 22 '18 at 13:57
















3














Try the code below. Make RadialGradientView as IBDesignable.



RadialGradientView.h



#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

IB_DESIGNABLE
@interface RadialGradientView : UIView

@end

NS_ASSUME_NONNULL_END


RadialGradientView.m



#import "RadialGradientView.h"
#import <CoreGraphics/CoreGraphics.h>

@implementation RadialGradientView

- (void)drawRect:(CGRect)rect {
// Drawing code

UIColor* radialColor = [[UIColor colorWithRed:0.93 green:0.95 blue:0.22 alpha:1] CGColor];
UIColor* outerColor = [[UIColor colorWithRed:0.08 green:0.42 blue:0.32 alpha:1] CGColor];

[self.layer setCornerRadius: 10.0];
[self.layer setMasksToBounds:YES];

NSArray* colors = [[NSArray alloc] initWithObjects: radialColor, outerColor, nil];
CGFloat endRadius = sqrt(pow(self.frame.size.width / 1.9, 2) + pow(self.frame.size.height / 1.9, 2));
CGPoint startCenter = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 12);
CGPoint center = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 2);
CGGradientRef gradient = CGGradientCreateWithColors(nil, (CFArrayRef)colors, nil);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextDrawRadialGradient(context, gradient, startCenter, 0.0, center, endRadius, 0);
}


@end


Swift



@IBDesignable class RadialGradientView: UIView {

@IBInspectable var radialColor: UIColor = UIColor(red: 0.93, green: 0.95, blue: 0.22, alpha: 1.0)
@IBInspectable var outerColor: UIColor = UIColor(red: 0.08, green: 0.42, blue: 0.32, alpha: 1.0)

override func draw(_ rect: CGRect) {

layer.cornerRadius = 10.0
layer.masksToBounds = true

let colors = [radialColor.cgColor, outerColor.cgColor]
let endRadius = sqrt(pow(frame.width/1.9, 2) + pow(frame.height/1.9, 2))
let startCenter = CGPoint(x: bounds.size.width / 2, y: bounds.size.height / 12)
let center = CGPoint(x: bounds.size.width / 2, y: bounds.size.height / 2)
let gradient = CGGradient(colorsSpace: nil, colors: colors as CFArray, locations: nil)
let context = UIGraphicsGetCurrentContext()

context?.drawRadialGradient(gradient!, startCenter: startCenter, startRadius: 0.0, endCenter: center, endRadius: endRadius, options: CGGradientDrawingOptions.drawsBeforeStartLocation)
}
}


Screenshot



enter image description here






share|improve this answer
























  • thanks worked nice)

    – Jack
    Nov 22 '18 at 13:53











  • Glad to help you Jack 😀

    – Sateesh
    Nov 22 '18 at 13:57














3












3








3







Try the code below. Make RadialGradientView as IBDesignable.



RadialGradientView.h



#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

IB_DESIGNABLE
@interface RadialGradientView : UIView

@end

NS_ASSUME_NONNULL_END


RadialGradientView.m



#import "RadialGradientView.h"
#import <CoreGraphics/CoreGraphics.h>

@implementation RadialGradientView

- (void)drawRect:(CGRect)rect {
// Drawing code

UIColor* radialColor = [[UIColor colorWithRed:0.93 green:0.95 blue:0.22 alpha:1] CGColor];
UIColor* outerColor = [[UIColor colorWithRed:0.08 green:0.42 blue:0.32 alpha:1] CGColor];

[self.layer setCornerRadius: 10.0];
[self.layer setMasksToBounds:YES];

NSArray* colors = [[NSArray alloc] initWithObjects: radialColor, outerColor, nil];
CGFloat endRadius = sqrt(pow(self.frame.size.width / 1.9, 2) + pow(self.frame.size.height / 1.9, 2));
CGPoint startCenter = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 12);
CGPoint center = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 2);
CGGradientRef gradient = CGGradientCreateWithColors(nil, (CFArrayRef)colors, nil);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextDrawRadialGradient(context, gradient, startCenter, 0.0, center, endRadius, 0);
}


@end


Swift



@IBDesignable class RadialGradientView: UIView {

@IBInspectable var radialColor: UIColor = UIColor(red: 0.93, green: 0.95, blue: 0.22, alpha: 1.0)
@IBInspectable var outerColor: UIColor = UIColor(red: 0.08, green: 0.42, blue: 0.32, alpha: 1.0)

override func draw(_ rect: CGRect) {

layer.cornerRadius = 10.0
layer.masksToBounds = true

let colors = [radialColor.cgColor, outerColor.cgColor]
let endRadius = sqrt(pow(frame.width/1.9, 2) + pow(frame.height/1.9, 2))
let startCenter = CGPoint(x: bounds.size.width / 2, y: bounds.size.height / 12)
let center = CGPoint(x: bounds.size.width / 2, y: bounds.size.height / 2)
let gradient = CGGradient(colorsSpace: nil, colors: colors as CFArray, locations: nil)
let context = UIGraphicsGetCurrentContext()

context?.drawRadialGradient(gradient!, startCenter: startCenter, startRadius: 0.0, endCenter: center, endRadius: endRadius, options: CGGradientDrawingOptions.drawsBeforeStartLocation)
}
}


Screenshot



enter image description here






share|improve this answer













Try the code below. Make RadialGradientView as IBDesignable.



RadialGradientView.h



#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

IB_DESIGNABLE
@interface RadialGradientView : UIView

@end

NS_ASSUME_NONNULL_END


RadialGradientView.m



#import "RadialGradientView.h"
#import <CoreGraphics/CoreGraphics.h>

@implementation RadialGradientView

- (void)drawRect:(CGRect)rect {
// Drawing code

UIColor* radialColor = [[UIColor colorWithRed:0.93 green:0.95 blue:0.22 alpha:1] CGColor];
UIColor* outerColor = [[UIColor colorWithRed:0.08 green:0.42 blue:0.32 alpha:1] CGColor];

[self.layer setCornerRadius: 10.0];
[self.layer setMasksToBounds:YES];

NSArray* colors = [[NSArray alloc] initWithObjects: radialColor, outerColor, nil];
CGFloat endRadius = sqrt(pow(self.frame.size.width / 1.9, 2) + pow(self.frame.size.height / 1.9, 2));
CGPoint startCenter = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 12);
CGPoint center = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 2);
CGGradientRef gradient = CGGradientCreateWithColors(nil, (CFArrayRef)colors, nil);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextDrawRadialGradient(context, gradient, startCenter, 0.0, center, endRadius, 0);
}


@end


Swift



@IBDesignable class RadialGradientView: UIView {

@IBInspectable var radialColor: UIColor = UIColor(red: 0.93, green: 0.95, blue: 0.22, alpha: 1.0)
@IBInspectable var outerColor: UIColor = UIColor(red: 0.08, green: 0.42, blue: 0.32, alpha: 1.0)

override func draw(_ rect: CGRect) {

layer.cornerRadius = 10.0
layer.masksToBounds = true

let colors = [radialColor.cgColor, outerColor.cgColor]
let endRadius = sqrt(pow(frame.width/1.9, 2) + pow(frame.height/1.9, 2))
let startCenter = CGPoint(x: bounds.size.width / 2, y: bounds.size.height / 12)
let center = CGPoint(x: bounds.size.width / 2, y: bounds.size.height / 2)
let gradient = CGGradient(colorsSpace: nil, colors: colors as CFArray, locations: nil)
let context = UIGraphicsGetCurrentContext()

context?.drawRadialGradient(gradient!, startCenter: startCenter, startRadius: 0.0, endCenter: center, endRadius: endRadius, options: CGGradientDrawingOptions.drawsBeforeStartLocation)
}
}


Screenshot



enter image description here







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 22 '18 at 13:33









SateeshSateesh

2,1171819




2,1171819













  • thanks worked nice)

    – Jack
    Nov 22 '18 at 13:53











  • Glad to help you Jack 😀

    – Sateesh
    Nov 22 '18 at 13:57



















  • thanks worked nice)

    – Jack
    Nov 22 '18 at 13:53











  • Glad to help you Jack 😀

    – Sateesh
    Nov 22 '18 at 13:57

















thanks worked nice)

– Jack
Nov 22 '18 at 13:53





thanks worked nice)

– Jack
Nov 22 '18 at 13:53













Glad to help you Jack 😀

– Sateesh
Nov 22 '18 at 13:57





Glad to help you Jack 😀

– Sateesh
Nov 22 '18 at 13:57




















draft saved

draft discarded




















































Thanks for contributing an answer to Stack Overflow!


  • Please be sure to answer the question. Provide details and share your research!

But avoid



  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.


To learn more, see our tips on writing great answers.




draft saved


draft discarded














StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53425773%2fhow-to-make-radial-gradient-to-be-faded-in-the-middle-of-view-in-objective-c%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown





















































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown

































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown







Popular posts from this blog

MongoDB - Not Authorized To Execute Command

How to fix TextFormField cause rebuild widget in Flutter

in spring boot 2.1 many test slices are not allowed anymore due to multiple @BootstrapWith