我有一个名为“theImageView”的 UIImageView，UIImage 是单一颜色的（透明背景），就像下面的左黑心一样。如何根据 iOS 7+ 导航栏图标中使用的 tint 方法在 iOS 7 或更高版本中以编程方式更改此图像的色调颜色？
此方法是否也适用于 Apple Watch 应用的 WatchKit？
【问题讨论】：
UIImage 和UIImageRenderingModeAlwaysTemplate，然后设置UIImageVIew 的tintColor 确实有效。 （在我的代码中^^）
标签： ios swift uiimage uicolor watchkit
这是一个可以解决问题的类别
@interface UIImage(Overlay)
@end
@implementation UIImage(Overlay)
- (UIImage *)imageWithColor:(UIColor *)color1
{
UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(context, 0, self.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextSetBlendMode(context, kCGBlendModeNormal);
CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
CGContextClipToMask(context, rect, self.CGImage);
[color1 setFill];
CGContextFillRect(context, rect);
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
@end
所以你会这样做：
theImageView.image = [theImageView.image imageWithColor:[UIColor redColor]];
【讨论】：
我必须在 Swift 中使用 extension 来执行此操作。
我想我会分享我是如何做到的：
extension UIImage {
func imageWithColor(color1: UIColor) -> UIImage {
UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
color1.setFill()
let context = UIGraphicsGetCurrentContext() as CGContextRef
CGContextTranslateCTM(context, 0, self.size.height)
CGContextScaleCTM(context, 1.0, -1.0);
CGContextSetBlendMode(context, CGBlendMode.Normal)
let rect = CGRectMake(0, 0, self.size.width, self.size.height) as CGRect
CGContextClipToMask(context, rect, self.CGImage)
CGContextFillRect(context, rect)
let newImage = UIGraphicsGetImageFromCurrentImageContext() as UIImage
UIGraphicsEndImageContext()
return newImage
}
}
用法：
theImageView.image = theImageView.image.imageWithColor(UIColor.redColor())
斯威夫特 4
extension UIImage {
func imageWithColor(color1: UIColor) -> UIImage {
UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
color1.setFill()
let context = UIGraphicsGetCurrentContext()
context?.translateBy(x: 0, y: self.size.height)
context?.scaleBy(x: 1.0, y: -1.0)
context?.setBlendMode(CGBlendMode.normal)
let rect = CGRect(origin: .zero, size: CGSize(width: self.size.width, height: self.size.height))
context?.clip(to: rect, mask: self.cgImage!)
context?.fill(rect)
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage!
}
}
用法：
theImageView.image = theImageView.image?.imageWithColor(color1: UIColor.red)
【讨论】：
color1.setFill() 移动到方法 UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale) 的第一行正下方，这对我不起作用。
CGBlendMode.Normal
试试这个
http://robots.thoughtbot.com/designing-for-ios-blending-modes
或
- (void)viewDidLoad
{
[super viewDidLoad];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 30, 300, 50)];
label.numberOfLines = 0;
label.font = [UIFont systemFontOfSize:13];
label.text = @"These checkmarks use the same gray checkmark image with a tintColor applied to the image view";
[self.view addSubview:label];
[self _createImageViewAtY:100 color:[UIColor purpleColor]];
}
- (void)_createImageViewAtY:(int)y color:(UIColor *)color {
UIImage *image = [[UIImage imageNamed:@"gray checkmark.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
CGRect frame = imageView.frame;
frame.origin.x = 100;
frame.origin.y = y;
imageView.frame = frame;
if (color)
imageView.tintColor = color;
[self.view addSubview:imageView];
}
【讨论】：
iOS
对于 iOS 应用，在 Swift 3、4 或 5 中：
theImageView.image = theImageView.image?.withRenderingMode(.alwaysTemplate)
theImageView.tintColor = UIColor.red
对于 Swift 2：
theImageView.image = theImageView.image?.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate)
theImageView.tintColor = UIColor.redColor()
同时，现代的 Objective-C 解决方案是：
theImageView.image = [theImageView.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[theImageView setTintColor:[UIColor redColor]];
Watchkit
在 Apple Watch 应用程序的 WatchKit 中，您可以设置 tint color for a template image。
然后在 Swift 3 或 4 中设置色调颜色：
theImage.setTintColor(UIColor.red)
斯威夫特 2：
theImage.setTintColor(UIColor.redColor())
然后在 Objective-C 中设置 tint 颜色：
[self.theImage setTintColor:[UIColor redColor]];
如果您使用模板图像并且未应用色调颜色，则会应用您的 WatchKit 应用的全局色调。如果您没有设置全局色调，theImage 用作模板图像时默认为浅蓝色。
【讨论】：
使用斯威夫特
let commentImageView = UIImageView(frame: CGRectMake(100, 100, 100, 100))
commentImageView.image = UIImage(named: "myimage.png")!.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate)
commentImageView.tintColor = UIColor.blackColor()
addSubview(commentImageView)
【讨论】：
.AlwaysTemplate。
【讨论】：
imageView.tintColor。
更改 UIImage SVG / PDF 的色调，适用于具有独特颜色的图像：
import Foundation
// MARK: - UIImage extensions
public extension UIImage {
//
/// Tint Image
///
/// - Parameter fillColor: UIColor
/// - Returns: Image with tint color
func tint(with fillColor: UIColor) -> UIImage? {
let image = withRenderingMode(.alwaysTemplate)
UIGraphicsBeginImageContextWithOptions(size, false, scale)
fillColor.set()
image.draw(in: CGRect(origin: .zero, size: size))
guard let imageColored = UIGraphicsGetImageFromCurrentImageContext() else {
return nil
}
UIGraphicsEndImageContext()
return imageColored
}
}
更改 UIImageView 的色调，适用于具有独特颜色的图像：
let imageView = UIImageView(frame: CGRect(x: 50, y: 50, width: 50, height: 50))
imageView.image = UIImage(named: "hello.png")!.withRenderingMode(.alwaysTemplate)
imageView.tintColor = .yellow
为 picture 更改 UIImage 的色调，使用它：
import Foundation
// MARK: - Extensions UIImage
public extension UIImage {
/// Tint, Colorize image with given tint color
/// This is similar to Photoshop's "Color" layer blend mode
/// 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
///
/// - Parameter TintColor: Tint color
/// - Returns: Tinted image
public func tintImage(with fillColor: 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)
fillColor.setFill()
context.fill(rect)
// mask by alpha values of original image
context.setBlendMode(.destinationIn)
context.draw(context.makeImage()!, 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!
}
}
【讨论】：
现在我使用基于 Duncan Babbage 响应的这种方法：
+ (UIImageView *) tintImageView: (UIImageView *)imageView withColor: (UIColor*) color{
imageView.image = [imageView.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[imageView setTintColor:color];
return imageView;
}
【讨论】：
为了快速 3 个目的
theImageView.image = theImageView.image!.withRenderingMode(.alwaysTemplate)
theImageView.tintColor = UIColor.red
【讨论】：
如果你有一个图像来替换清除按钮，你可以在 Swift 3 中使用它
func addTextfieldRightView(){
let rightViewWidth:CGFloat = 30
let viewMax = self.searchTxt.frame.height
let buttonMax = self.searchTxt.frame.height - 16
let buttonView = UIView(frame: CGRect(
x: self.searchTxt.frame.width - rightViewWidth,
y: 0,
width: viewMax,
height: viewMax))
let myButton = UIButton(frame: CGRect(
x: (viewMax - buttonMax) / 2,
y: (viewMax - buttonMax) / 2,
width: buttonMax,
height: buttonMax))
myButton.setImage(UIImage(named: "BlueClear")!, for: .normal)
buttonView.addSubview(myButton)
let clearPressed = UITapGestureRecognizer(target: self, action: #selector(SearchVC.clearPressed(sender:)))
buttonView.isUserInteractionEnabled = true
buttonView.addGestureRecognizer(clearPressed)
myButton.addTarget(self, action: #selector(SearchVC.clearPressed(sender:)), for: .touchUpInside)
self.searchTxt.rightView = buttonView
self.searchTxt.rightViewMode = .whileEditing
}
【讨论】：
如果有人关心没有UIImageView 的解决方案：
// (Swift 3)
extension UIImage {
func tint(with color: UIColor) -> UIImage {
var image = withRenderingMode(.alwaysTemplate)
UIGraphicsBeginImageContextWithOptions(size, false, scale)
color.set()
image.draw(in: CGRect(origin: .zero, size: size))
image = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return image
}
}
【讨论】：
也可以从代码和 Interface Builder 中使用的子类：
@implementation TintedImageView
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self setup];
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if (self) {
[self setup];
}
return self;
}
-(void)setup {
self.image = [self.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
}
@end
【讨论】：
iOS
从 Interface Builder 执行此操作的解决方案，set templateImage param in keyPath 并从 IB 中选择您的色调
extension UIImageView {
// make template image with tint color
var templateImage: Bool {
set {
if newValue, let image = self.image {
let newImage = image.withRenderingMode(.alwaysTemplate)
self.image = newImage
}
} get {
return false
}
}
}
【讨论】：
这是我的 UIImage 扩展，你可以直接对图像使用 changeTintColor 函数。
extension UIImage {
func changeTintColor(color: UIColor) -> UIImage {
var newImage = self.withRenderingMode(.alwaysTemplate)
UIGraphicsBeginImageContextWithOptions(self.size, false, newImage.scale)
color.set()
newImage.draw(in: CGRect(x: 0.0, y: 0.0, width: self.size.width, height: self.size.height))
newImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return newImage
}
func changeColor(color: UIColor) -> UIImage {
let backgroundSize = self.size
UIGraphicsBeginImageContext(backgroundSize)
guard let context = UIGraphicsGetCurrentContext() else {
return self
}
var backgroundRect = CGRect()
backgroundRect.size = backgroundSize
backgroundRect.origin.x = 0
backgroundRect.origin.y = 0
var red: CGFloat = 0
var green: CGFloat = 0
var blue: CGFloat = 0
var alpha: CGFloat = 0
color.getRed(&red, green: &green, blue: &blue, alpha: &alpha)
context.setFillColor(red: red, green: green, blue: blue, alpha: alpha)
context.translateBy(x: 0, y: backgroundSize.height)
context.scaleBy(x: 1.0, y: -1.0)
context.clip(to: CGRect(x: 0.0, y: 0.0, width: self.size.width, height: self.size.height),
mask: self.cgImage!)
context.fill(backgroundRect)
var imageRect = CGRect()
imageRect.size = self.size
imageRect.origin.x = (backgroundSize.width - self.size.width) / 2
imageRect.origin.y = (backgroundSize.height - self.size.height) / 2
context.setBlendMode(.multiply)
context.draw(self.cgImage!, in: imageRect)
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage!
}
}
这样的用法示例
let image = UIImage(named: "sample_image")
imageView.image = image.changeTintColor(color: UIColor.red)
你可以使用changechangeColor函数来改变图像颜色
【讨论】：
来自 fuzz
的 Swift 3 版本的扩展答案func imageWithColor(color: UIColor) -> UIImage {
UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
color.setFill()
let context = UIGraphicsGetCurrentContext()! as CGContext
context.translateBy(x: 0, y: self.size.height)
context.scaleBy(x: 1.0, y: -1.0);
context.setBlendMode(.normal)
let rect = CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height) as CGRect
context.clip(to: rect, mask: self.cgImage!)
context.fill(rect)
let newImage = UIGraphicsGetImageFromCurrentImageContext()! as UIImage
UIGraphicsEndImageContext()
return newImage
}
【讨论】：
profileImageView.image = theImageView.image!.withRenderingMode(.alwaysTemplate)
profileImageView.tintColor = UIColor.green
或
首先选择图像资产中的特定图像，然后选择红色作为模板而不是默认，然后在该写入行之后。 profileImageView.tintColor = UIColor.green
【讨论】：
用于为 UIButton 的图像着色
let image1 = "ic_shopping_cart_empty"
btn_Basket.setImage(UIImage(named: image1)?.withRenderingMode(.alwaysTemplate), for: .normal)
btn_Basket.setImage(UIImage(named: image1)?.withRenderingMode(.alwaysTemplate), for: .selected)
btn_Basket.imageView?.tintColor = UIColor(UIColor.Red)
【讨论】：
如果您有 SVG 图像的任何 ID，则可以根据 ID 填充颜色。
let image = SVGKImage(named: "iconName")
let svgIMGV = SVGKFastImageView(frame: self.imgView.frame)
svgIMGV.image = image
svgIMGV.fillTintColor(colorImage: UIColor.red, iconID: "Bank")
// Add in extension SVGKImageView
extension SVGKImageView {
func fillTintColor(colorImage: UIColor, iconID: String) {
if self.image != nil && self.image.caLayerTree != nil {
print(self.image.caLayerTree.sublayers)
guard let sublayers = self.image.caLayerTree.sublayers else { return }
fillRecursively(sublayers: sublayers, color: colorImage, iconID: iconID)
}
}
private func fillRecursively(sublayers: [CALayer], color: UIColor, iconID: String, hasFoundLayer: Bool) {
var isLayerFound = false
for layer in sublayers {
if let l = layer as? CAShapeLayer {
print(l.name)
//IF you want to color the specific shapelayer by id else remove the l.name == "myID" validation
if let name = l.name, hasFoundLayer == true && name == "myID" {
self.colorThatImageWIthColor(color: color, layer: l)
print("Colouring FInished")
}
} else {
if layer.name == iconID {
if let innerSublayer = layer.sublayers as? [CAShapeLayer] {
fillRecursively(sublayers: innerSublayer, color: color, iconID: iconID, hasFoundLayer: true )
print("FOund")
}
} else {
if let l = layer as? CALayer, let sub = l.sublayers {
fillRecursively(sublayers: sub, color: color, iconID: iconID, hasFoundLayer: false)
}
}
}
}
}
func colorThatImageWIthColor(color: UIColor, layer: CAShapeLayer) {
if layer.strokeColor != nil {
layer.strokeColor = color.cgColor
}
if layer.fillColor != nil {
layer.fillColor = color.cgColor
}
}
}
或查看此示例。
【讨论】：
let navHeight = self.navigationController?.navigationBar.frame.height;
let menuBtn = UIButton(type: .custom)
menuBtn.frame = CGRect(x: 0, y: 0, width: 45, height: navHeight!)
menuBtn.setImage(UIImage(named:"image_name")!.withRenderingMode(.alwaysTemplate), for: .normal)
menuBtn.tintColor = .black
【讨论】：
iOS 13 及以上版本，您可以简单地使用
let image = UIImage(named: "Heart")?.withRenderingMode(.alwaysTemplate)
if #available(iOS 13.0, *) {
imageView.image = image?.withTintColor(UIColor.white)
}
【讨论】：
用背景和填充颜色重绘图像
extension UIImage {
func withBackground(color: UIColor, fill fillColor: UIColor) -> UIImage {
UIGraphicsBeginImageContextWithOptions(size, true, scale)
guard let ctx = UIGraphicsGetCurrentContext(), let image = cgImage else { return self }
defer { UIGraphicsEndImageContext() }
ctx.concatenate(CGAffineTransform(a: 1, b: 0, c: 0, d: -1, tx: 0, ty: size.height))
let rect = CGRect(origin: .zero, size: size)
// draw background
ctx.setFillColor(color.cgColor)
ctx.fill(rect)
// draw image with fill color
ctx.clip(to: rect, mask: image)
ctx.setFillColor(fillColor.cgColor)
ctx.fill(rect)
return UIGraphicsGetImageFromCurrentImageContext() ?? self
}
}
【讨论】：
从 iOS 13 开始就有 UIImage 的原生方法
let image = yourImage.withTintColor(.systemRed)
【讨论】：
另外，对于上述答案，在 iOS 13 及更高版本中有一种干净的方法
let image = UIImage(named: "imageName")?.withTintColor(.white, renderingMode: .alwaysTemplate)
【讨论】：
这是一个适用于 Swift 5 的简单扩展：
extension UIImageView {
func setImageTintColor(_ color: UIColor) {
let tintedImage = self.image?.withRenderingMode(.alwaysTemplate)
self.image = tintedImage
self.tintColor = color
}
}
用法：
myImageView.setImageTintColor(.systemBlue)
【讨论】：