更改button中的png的颜色 – ios

我已经创build了一组透明的白色PNG图标：

而我想要做的就是能够把它们染成其他颜色。 如蓝色，灰色等

我注意到，“点击/点击”他们自动变成灰色。 所以我认为我可以用水龙头或其正常状态将灰色变成任何我喜欢的东西：

什么是实现这个目标的最好方法？

Answer 1

以下代码将为button的正常状态设置色调颜色：

let origImage = UIImage(named: "imageName"); let tintedImage = origImage?.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate) btn.setImage(tintedImage, forState: .Normal) btn.tintColor = UIColor.redColor() 

button状态变化时，可以根据需要更改色调颜色。

编辑：更新为Swift3

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

Answer 2

iOS 7为视图引入了一个名为tintColor的属性（包括UIImageView）。 不过，你也需要在UIImage上设置渲染types，以达到任何效果。

 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]; 

这应该会产生你在默认状态下的效果。

Answer 3

对于图像的改变色调（ 挑选 ， 古典图像 ， 照片 ）使用：

示例图像：

Swift 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

Swift 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 4

你可以使用这个扩展名：

 extension UIImage { func maskWith(color: UIColor) -> UIImage { UIGraphicsBeginImageContextWithOptions(size, false, scale) let context = UIGraphicsGetCurrentContext()! context.translateBy(x: 0, y: size.height) context.scaleBy(x: 1.0, y: -1.0) context.setBlendMode(.normal) let rect = CGRect(x: 0, y: 0, width: size.width, height: size.height) context.clip(to: rect, mask: cgImage!) color.setFill() context.fill(rect) let newImage = UIGraphicsGetImageFromCurrentImageContext()! UIGraphicsEndImageContext() return newImage } } 

Answer 5

如果您使用资产目录，则可以将图片资源本身设置为以模板模式进行渲染。 之后，你可以在界面生成器（或代码）中设置button的tintColor，它应该采取。

Answer 6

如果你正在设置一个button的图像，只需去属性检查器，并将buttontypes更改为系统。 然后设置图像并更改色调颜色。 图像的颜色会改变。 如果没有发生，请检查buttontypes。