iOS - Draw gradient - Swift

Question

I\'m trying to draw a gradient to UILabel, but it draws only the colors I can\'t see the text. I saw the code from here StackOverflow

my modification:

Answer 1

There is an easier way of getting a gradient as a UIImage. You can use a CAGradientLayer. For example:

func yellowGradientImage(bounds:CGRect) -> UIImage
{
    let gradientLayer = CAGradientLayer()
    gradientLayer.colors = [UIColor(red: (202 / 255.0), green: (197 / 255.0), blue: (52 / 255.0), alpha: 1.0).CGColor, UIColor(red: (253 / 255.0), green: (248 / 255.0), blue: (101 / 255.0), alpha: 1.0).CGColor]
    gradientLayer.bounds = bounds
    UIGraphicsBeginImageContextWithOptions(gradientLayer.bounds.size, true, 0.0)
    let context = UIGraphicsGetCurrentContext()
    gradientLayer.renderInContext(context!)
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image
}

To apply the gradient to text you next need to use the image returned as the textColor using UIColor(patternImage: ...). For example:

let label = UILabel()
label.font = UIFont.systemFontOfSize(150.0)
label.text = "HELLO WORLD"
label.sizeToFit()

let image = yellowGradientImage(label.bounds)
label.textColor = UIColor(patternImage: image)

Which results in:

swift 3.0:

func yellowGradientImage(bounds:CGRect) -> UIImage
{
    let gradientLayer = CAGradientLayer()
    gradientLayer.colors = [UIColor(red: (202 / 255.0), green: (197 / 255.0), blue: (52 / 255.0), alpha: 1.0).cgColor, UIColor(red: (253 / 255.0), green: (248 / 255.0), blue: (101 / 255.0), alpha: 1.0).cgColor]
    gradientLayer.bounds = bounds
    UIGraphicsBeginImageContextWithOptions(gradientLayer.bounds.size, true, 0.0)
    let context = UIGraphicsGetCurrentContext()
    gradientLayer.render(in: context!)
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image!
}

let label = UILabel()
label.font = UIFont.systemFont(ofSize: 150.0)
label.text = "HELLO WORLD"
label.sizeToFit()

let image = yellowGradientImage(bounds: label.bounds)
label.textColor = UIColor(patternImage: image)

Answer 2

add a view, modify draw rect with below code.

override func drawRect(rect: CGRect) {
        // Drawing code

        let currentContext = UIGraphicsGetCurrentContext()

        CGContextSaveGState(currentContext);
        let colorSpace = CGColorSpaceCreateDeviceRGB()

        let startColor = UIColor(red: 0.1, green: 0.0, blue: 0.0, alpha: 0.0)
        let startColorComponents = CGColorGetComponents(startColor.CGColor)
        let middleColor = UIColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 0.2)
        let middleColorComponents = CGColorGetComponents(middleColor.CGColor)
        let lowerMiddleColor = UIColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 0.3)
        let lowerMiddleColorComponents = CGColorGetComponents(lowerMiddleColor.CGColor)
        let endColor = UIColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 0.5)
        let endColorComponents = CGColorGetComponents(endColor.CGColor)

        var colorComponents = [startColorComponents[0], startColorComponents[1], startColorComponents[2], startColorComponents[3], middleColorComponents[0], middleColorComponents[1], middleColorComponents[2], middleColorComponents[3], lowerMiddleColorComponents[0], lowerMiddleColorComponents[1], lowerMiddleColorComponents[2], lowerMiddleColorComponents[3], endColorComponents[0], endColorComponents[1], endColorComponents[2], endColorComponents[3]]
        var locations:[CGFloat] = [0.0, 0.6, 0.8, 1.0]
        let gradient = CGGradientCreateWithColorComponents(colorSpace,&colorComponents,&locations,4)
        let startPoint = CGPointMake(0, 0)
        let endPoint = CGPointMake(0, self.bounds.height)
        CGContextAddRect(currentContext, CGRect(x: 0, y: 0, width: self.bounds.width, height: self.bounds.height));
        CGContextClip(currentContext);
        CGContextDrawLinearGradient(currentContext,gradient,startPoint,endPoint, CGGradientDrawingOptions.DrawsBeforeStartLocation)
        CGContextRestoreGState(currentContext)
    }

Now in storyboard add a view change class to your gradient class and add a label to this view.

See if it works for you.