How to Change the Color of an Uiimage

Changing UIImage color

Since iOS 7, this is the most simple way of doing it.

Objective-C:

theImageView.image = [theImageView.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[theImageView setTintColor:[UIColor redColor]];

Swift 2.0:

theImageView.image = theImageView.image?.imageWithRenderingMode(.AlwaysTemplate) 
theImageView.tintColor = UIColor.magentaColor()

Swift 4.0:

theImageView.image = theImageView.image?.withRenderingMode(.alwaysTemplate) 
theImageView.tintColor = .magenta

Storyboard:

First configure the image as template ( on right bar - Render as) in your assets. Then the color of the image would be the tint color applied.

How to change the color of an UIImage

UIImage *image = [UIImage imageNamed:@"triangle.png"];

CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextClipToMask(context, rect, image.CGImage);
CGContextSetFillColorWithColor(context, [[UIColor redColor] CGColor]);
CGContextFillRect(context, rect);
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

UIImage *flippedImage = [UIImage imageWithCGImage:img.CGImage 
                                            scale:1.0 orientation: UIImageOrientationDownMirrored];

yourUIImageView.image = flippedImage;

How to change the color of a UIImage in Swift

edit/update:

For iOS10+ we can use UIGraphicsImageRenderer:

Xcode 11 • Swift 5.1

extension UIImage {
    func tinted(with color: UIColor, isOpaque: Bool = false) -> UIImage? {
        let format = imageRendererFormat
        format.opaque = isOpaque
        return UIGraphicsImageRenderer(size: size, format: format).image { _ in
            color.set()
            withRenderingMode(.alwaysTemplate).draw(at: .zero) 
        }
    }
}

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Playground Testing

let camera = UIImage(data: try! Data(contentsOf: URL(string: "https://cdn4.iconfinder.com/data/icons/ionicons/512/icon-camera-128.png")!))!
let redCamera = camera.tinted(with: .red)

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original answer

You can use UIGraphicsBeginImageContextWithOptions to begin an image context, set the desired color and use image's method func draw(in rect: CGRect) to draw your icon image using rendering mode .alwaysTemplate on it:

extension UIImage {
    func tinted(with color: UIColor) -> UIImage? {
        UIGraphicsBeginImageContextWithOptions(size, false, scale)
        defer { UIGraphicsEndImageContext() }
        color.set()
        withRenderingMode(.alwaysTemplate)
            .draw(in: CGRect(origin: .zero, size: size))
        return UIGraphicsGetImageFromCurrentImageContext()
    }
}

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How can I change image tintColor in iOS and WatchKit

iOS
For an iOS app, in Swift 3, 4 or 5:

theImageView.image = theImageView.image?.withRenderingMode(.alwaysTemplate)
theImageView.tintColor = UIColor.red

For Swift 2:

theImageView.image = theImageView.image?.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate)
theImageView.tintColor = UIColor.redColor()

Meanwhile, the modern Objective-C solution is:

theImageView.image = [theImageView.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[theImageView setTintColor:[UIColor redColor]];

---

Watchkit
In WatchKit for Apple Watch apps, you can set the tint color for a template image.

1. You must add your image to an Asset Catalog in your WatchKit App, and set the image set to be rendered as a Template Image in the Attributes Inspector. Unlike for an iPhone app, you cannot set the template rendering in code in the WatchKit Extension at present.
2. Set that image to be used in your WKInterfaceImage in interface builder for your app
3. Create an IBOutlet in your WKInterfaceController for the WKInterfaceImage called 'theImage'...

To then set the tint color in Swift 3 or 4:

theImage.setTintColor(UIColor.red)

Swift 2:

theImage.setTintColor(UIColor.redColor())

To then set the tint color in Objective-C:

[self.theImage setTintColor:[UIColor redColor]];

If you use a template image and do not apply a tint colour, the Global Tint for your WatchKit app will be applied. If you have not set a Global Tint, theImage will be tinted light blue by default when used as a template image.

How can I change image tintColor

Try to generate new image for yourself

UIImage *newImage = [_sketchImageView.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
UIGraphicsBeginImageContextWithOptions(image.size, NO, newImage.scale);
[yourTintColor set];
[newImage drawInRect:CGRectMake(0, 0, image.size.width, newImage.size.height)];
newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

_sketchImageView.image = newImage;

And use it.

Good luck

======= UPDATE =======

This solution will only change color of all pixel's image.

Example: we have a book image: http://pngimg.com/upload/book_PNG2113.png

And after running above code (exp: TintColor is RED). We have:

SO: how your image is depends on how you designed it

ios: change the colors of a UIImage

hi you want to change remove/ one specific color means use the below category....

.h file:

#import <UIKit/UIKit.h>

@interface UIImage (Color)

+ (UIImage*)setBackgroundImageByColor:(UIColor *)backgroundColor withFrame:(CGRect )rect;

+ (UIImage*) replaceColor:(UIColor*)color inImage:(UIImage*)image withTolerance:(float)tolerance;

+(UIImage *)changeWhiteColorTransparent: (UIImage *)image;

+(UIImage *)changeColorTo:(NSMutableArray*) array Transparent: (UIImage *)image;

//resizing Stuff...
+ (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize;

@end

.m file

#import <QuartzCore/QuartzCore.h>
#import "UIImage+Color.h"

@implementation UIImage (Color)

+ (UIImage* )setBackgroundImageByColor:(UIColor *)backgroundColor withFrame:(CGRect )rect{

    // tcv - temporary colored view
    UIView *tcv = [[UIView alloc] initWithFrame:rect];
    [tcv setBackgroundColor:backgroundColor];

    // set up a graphics context of button's size
    CGSize gcSize = tcv.frame.size;
    UIGraphicsBeginImageContext(gcSize);
    // add tcv's layer to context
    [tcv.layer renderInContext:UIGraphicsGetCurrentContext()];
    // create background image now
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
     UIGraphicsEndImageContext();

     return image;
//    [tcv release];

}

+ (UIImage*) replaceColor:(UIColor*)color inImage:(UIImage*)image withTolerance:(float)tolerance {
    CGImageRef imageRef = [image CGImage];

    NSUInteger width = CGImageGetWidth(imageRef);
    NSUInteger height = CGImageGetHeight(imageRef);
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    NSUInteger bytesPerPixel = 4;
    NSUInteger bytesPerRow = bytesPerPixel * width;
    NSUInteger bitsPerComponent = 8;
    NSUInteger bitmapByteCount = bytesPerRow * height;

    unsigned char *rawData = (unsigned char*) calloc(bitmapByteCount, sizeof(unsigned char));

    CGContextRef context = CGBitmapContextCreate(rawData, width, height,
                                                 bitsPerComponent, bytesPerRow, colorSpace,
                                                 kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
    CGColorSpaceRelease(colorSpace);

    CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);

    CGColorRef cgColor = [color CGColor];
    const CGFloat *components = CGColorGetComponents(cgColor);
    float r = components[0];
    float g = components[1];
    float b = components[2];
    //float a = components[3]; // not needed

    r = r * 255.0;
    g = g * 255.0;
    b = b * 255.0;

    const float redRange[2] = {
        MAX(r - (tolerance / 2.0), 0.0),
        MIN(r + (tolerance / 2.0), 255.0)
    };

    const float greenRange[2] = {
        MAX(g - (tolerance / 2.0), 0.0),
        MIN(g + (tolerance / 2.0), 255.0)
    };

    const float blueRange[2] = {
        MAX(b - (tolerance / 2.0), 0.0),
        MIN(b + (tolerance / 2.0), 255.0)
    };

    int byteIndex = 0;

    while (byteIndex < bitmapByteCount) {
        unsigned char red   = rawData[byteIndex];
        unsigned char green = rawData[byteIndex + 1];
        unsigned char blue  = rawData[byteIndex + 2];

        if (((red >= redRange[0]) && (red <= redRange[1])) &&
            ((green >= greenRange[0]) && (green <= greenRange[1])) &&
            ((blue >= blueRange[0]) && (blue <= blueRange[1]))) {
            // make the pixel transparent
            //
            rawData[byteIndex] = 0;
            rawData[byteIndex + 1] = 0;
            rawData[byteIndex + 2] = 0;
            rawData[byteIndex + 3] = 0;
        }

        byteIndex += 4;
    }

    UIImage *result = [UIImage imageWithCGImage:CGBitmapContextCreateImage(context)];

    CGContextRelease(context);
    free(rawData);

    return result;
}

+(UIImage *)changeWhiteColorTransparent: (UIImage *)image
{
    CGImageRef rawImageRef=image.CGImage;

    const float colorMasking[6] = {222, 255, 222, 255, 222, 255};

    UIGraphicsBeginImageContext(image.size);
    CGImageRef maskedImageRef=CGImageCreateWithMaskingColors(rawImageRef, colorMasking);
    {
        //if in iphone
        CGContextTranslateCTM(UIGraphicsGetCurrentContext(), 0.0, image.size.height);
        CGContextScaleCTM(UIGraphicsGetCurrentContext(), 1.0, -1.0); 
    }

    CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, image.size.width, image.size.height), maskedImageRef);
    UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
    CGImageRelease(maskedImageRef);
    UIGraphicsEndImageContext();    
    return result;
}

+(UIImage *)changeColorTo:(NSMutableArray*) array Transparent: (UIImage *)image
{
    CGImageRef rawImageRef=image.CGImage;

//    const float colorMasking[6] = {222, 255, 222, 255, 222, 255};

     const float colorMasking[6] = {[[array objectAtIndex:0] floatValue], [[array objectAtIndex:1] floatValue], [[array objectAtIndex:2] floatValue], [[array objectAtIndex:3] floatValue], [[array objectAtIndex:4] floatValue], [[array objectAtIndex:5] floatValue]};

    UIGraphicsBeginImageContext(image.size);
    CGImageRef maskedImageRef=CGImageCreateWithMaskingColors(rawImageRef, colorMasking);
    {
        //if in iphone
        CGContextTranslateCTM(UIGraphicsGetCurrentContext(), 0.0, image.size.height);
        CGContextScaleCTM(UIGraphicsGetCurrentContext(), 1.0, -1.0); 
    }

    CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, image.size.width, image.size.height), maskedImageRef);
    UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
    CGImageRelease(maskedImageRef);
    UIGraphicsEndImageContext();    
    return result;
}

+ (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
    //UIGraphicsBeginImageContext(newSize);
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    
    UIGraphicsEndImageContext();
    return newImage;
}

@end

i changed the removed white color to transparent by this code....

the call will be...

 self.rawImage.image=[UIImage changeWhiteColorTransparent:originalStateImage];

i hope this idea will help you....

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