更改按钮中的png颜色 - ios

Question

我有一组我创建的透明白色PNG图标:

而我想做的是能够将它们染成其他颜色.如蓝色,灰色等

我注意到"点击/点按"它们会自动变为灰色.所以我假设我可以通过点击或其正常状态将灰色改为我喜欢的任何颜色:

实现这一目标的最佳方法是什么？

Answer 1

以下代码将为按钮的正常状态设置色调颜色:

let origImage = UIImage(named: "imageName")
let tintedImage = origImage?.withRenderingMode(.alwaysTemplate)
btn.setImage(tintedImage, for: .normal)
btn.tintColor = .red

您可以根据按钮状态更改时的需要更改色调颜色.

编辑:已更新为Swift 3

let origImage = UIImage(named: "imageName")
let tintedImage = origImage?.withRenderingMode(.alwaysTemplate)
btn.setImage(tintedImage, forState: .normal)
btn.tintColor = .redColor

编辑:已更新为Swift 4.2

let origImage = UIImage(named: "imageName")
let tintedImage = origImage?.withRenderingMode(.alwaysTemplate)
btn.setImage(tintedImage, for: .normal)
btn.tintColor = .red

Answer 2

iOS 7为视图引入了一个名为tintColor的属性(包括UIImageView).但是,您还需要在UIImage上设置渲染类型,以使其具有任何效果.

UIImage *originalImage = [UIImage imageNamed:@"image.png"];
UIImage *tintedImage = [originalImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
UIImageView *imageView = [[UIImageView alloc] initWithImage:tintedImage];

imageView.tintColor = [UIColor grayColor];
[self.view addSubview:imageView];

这应该会产生您在默认状态下的效果.

Answer 3

斯威夫特 4 或 5

extension UIButton{

    func setImageTintColor(_ color: UIColor) {
        let tintedImage = self.imageView?.image?.withRenderingMode(.alwaysTemplate)
        self.setImage(tintedImage, for: .normal)
        self.tintColor = color
    }

}

用：

button.setImage(UIImage(named: "image_name"), for: .normal) // You can set image direct from Storyboard
button.setImageTintColor(UIColor.white)

Answer 4

我在下面找到了最简单的方法，

打开assetcatalog并选择图像，然后去属性检查器和变革Render As，以Template Image如下

然后在按钮Action方法中添加以下代码

yourButton.tintColor = .gray

Answer 5

您可以使用此扩展程序:

import UIKit

extension CGContext {

    func fill(_ rect: CGRect,
              with mask: CGImage,
              using color: CGColor) {

        saveGState()
        defer { restoreGState() }

        translateBy(x: 0.0, y: rect.size.height)
        scaleBy(x: 1.0, y: -1.0)
        setBlendMode(.normal)

        clip(to: rect, mask: mask)

        setFillColor(color)
        fill(rect)
    }
}

extension UIImage {

    func filled(with color: UIColor) -> UIImage {
        let rect = CGRect(origin: .zero, size: self.size)
        guard let mask = self.cgImage else { return self }

        if #available(iOS 10.0, *) {
            let rendererFormat = UIGraphicsImageRendererFormat()
            rendererFormat.scale = self.scale

            let renderer = UIGraphicsImageRenderer(size: rect.size,
                                                   format: rendererFormat)
            return renderer.image { context in
                context.cgContext.fill(rect,
                                       with: mask,
                                       using: color.cgColor)
            }
        } else {
            UIGraphicsBeginImageContextWithOptions(rect.size,
                                                   false,
                                                   self.scale)
            defer { UIGraphicsEndImageContext() }

            guard let context = UIGraphicsGetCurrentContext() else { return self }

            context.fill(rect,
                         with: mask,
                         using: color.cgColor)
            return UIGraphicsGetImageFromCurrentImageContext() ?? self
        }
    }
}

Answer 6

对于图像的变化色调(拾取,经典图像,照片),请使用:

示例图片:

斯威夫特2

public extension UIImage {
    /**
     Tint, Colorize image with given tint color<br><br>
     This is similar to Photoshop's "Color" layer blend mode<br><br>
     This is perfect for non-greyscale source images, and images that have both highlights and shadows that should be preserved<br><br>
     white will stay white and black will stay black as the lightness of the image is preserved<br><br>

     <img src="http://yannickstephan.com/easyhelper/tint1.png" height="70" width="120"/>

     **To**

     <img src="http://yannickstephan.com/easyhelper/tint2.png" height="70" width="120"/>

     - parameter tintColor: UIColor

     - returns: UIImage
     */
    public func tintPhoto(tintColor: UIColor) -> UIImage {

        return modifiedImage { context, rect in
            // draw black background - workaround to preserve color of partially transparent pixels
            CGContextSetBlendMode(context, .Normal)
            UIColor.blackColor().setFill()
            CGContextFillRect(context, rect)

            // draw original image
            CGContextSetBlendMode(context, .Normal)
            CGContextDrawImage(context, rect, self.CGImage)

            // tint image (loosing alpha) - the luminosity of the original image is preserved
            CGContextSetBlendMode(context, .Color)
            tintColor.setFill()
            CGContextFillRect(context, rect)

            // mask by alpha values of original image
            CGContextSetBlendMode(context, .DestinationIn)
            CGContextDrawImage(context, rect, self.CGImage)
        }
    }
    /**
     Tint Picto to color

     - parameter fillColor: UIColor

     - returns: UIImage
     */
    public func tintPicto(fillColor: UIColor) -> UIImage {

        return modifiedImage { context, rect in
            // draw tint color
            CGContextSetBlendMode(context, .Normal)
            fillColor.setFill()
            CGContextFillRect(context, rect)

            // mask by alpha values of original image
            CGContextSetBlendMode(context, .DestinationIn)
            CGContextDrawImage(context, rect, self.CGImage)
        }
    }
    /**
     Modified Image Context, apply modification on image

     - parameter draw: (CGContext, CGRect) -> ())

     - returns: UIImage
     */
    private func modifiedImage(@noescape draw: (CGContext, CGRect) -> ()) -> UIImage {

        // using scale correctly preserves retina images
        UIGraphicsBeginImageContextWithOptions(size, false, scale)
        let context: CGContext! = UIGraphicsGetCurrentContext()
        assert(context != nil)

        // correctly rotate image
        CGContextTranslateCTM(context, 0, size.height);
        CGContextScaleCTM(context, 1.0, -1.0);

        let rect = CGRectMake(0.0, 0.0, size.width, size.height)

        draw(context, rect)

        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}

UPD

斯威夫特3

extension UIImage {

    /**
     Tint, Colorize image with given tint color<br><br>
     This is similar to Photoshop's "Color" layer blend mode<br><br>
     This is perfect for non-greyscale source images, and images that have both highlights and shadows that should be preserved<br><br>
     white will stay white and black will stay black as the lightness of the image is preserved<br><br>

     <img src="http://yannickstephan.com/easyhelper/tint1.png" height="70" width="120"/>

     **To**

     <img src="http://yannickstephan.com/easyhelper/tint2.png" height="70" width="120"/>

     - parameter tintColor: UIColor

     - returns: UIImage
     */
    func tintPhoto(_ tintColor: UIColor) -> UIImage {

        return modifiedImage { context, rect in
            // draw black background - workaround to preserve color of partially transparent pixels
            context.setBlendMode(.normal)
            UIColor.black.setFill()
            context.fill(rect)

            // draw original image
            context.setBlendMode(.normal)
            context.draw(cgImage!, in: rect)

            // tint image (loosing alpha) - the luminosity of the original image is preserved
            context.setBlendMode(.color)
            tintColor.setFill()
            context.fill(rect)

            // mask by alpha values of original image
            context.setBlendMode(.destinationIn)
            context.draw(context.makeImage()!, in: rect)
        }
    }

    /**
     Tint Picto to color

     - parameter fillColor: UIColor

     - returns: UIImage
     */
    func tintPicto(_ fillColor: UIColor) -> UIImage {

        return modifiedImage { context, rect in
            // draw tint color
            context.setBlendMode(.normal)
            fillColor.setFill()
            context.fill(rect)

            // mask by alpha values of original image
            context.setBlendMode(.destinationIn)
            context.draw(cgImage!, in: rect)
        }
    }

    /**
     Modified Image Context, apply modification on image

     - parameter draw: (CGContext, CGRect) -> ())

     - returns: UIImage
     */
    fileprivate func modifiedImage(_ draw: (CGContext, CGRect) -> ()) -> UIImage {

        // using scale correctly preserves retina images
        UIGraphicsBeginImageContextWithOptions(size, false, scale)
        let context: CGContext! = UIGraphicsGetCurrentContext()
        assert(context != nil)

        // correctly rotate image
        context.translateBy(x: 0, y: size.height)
        context.scaleBy(x: 1.0, y: -1.0)

        let rect = CGRect(x: 0.0, y: 0.0, width: size.width, height: size.height)

        draw(context, rect)

        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image!
    }

}

Answer 7

如果您使用资产目录，您可以将图像资产本身设置为以模板模式呈现。之后，您可以在 Interface Builder（或在代码中）中设置按钮的 tintColor 并且它应该采用。

Answer 8

如果要为按钮设置图像，只需转到属性检查器，然后将按钮类型更改为system。然后设置图像并更改色调颜色。图像的颜色将改变。如果没有发生，请检查按钮类型。