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首页 > 解决方案 > iOS：如何在 TabBar 的 UIImage 中用另一种颜色替换特定颜色（选择和取消选择）？

ios - iOS：如何在 TabBar 的 UIImage 中用另一种颜色替换特定颜色（选择和取消选择）？

问题描述

当它被选中时，我想在我的 UITabBar 中用另一种颜色替换它。目的是获得一张我可以以编程方式更改颜色的图像。

我该怎么做？

let tabBarItem = UITabBarItem(title: menuName, image: unselectedImage, selectedImage: selectedImage)

我检查了没有成功的票：
link1，link2 在此处输入图像描述

标签： iosswiftuitabbaruigraphicscontext

解决方案

我遇到了同样的问题。您应该创建一个背景白色 png，并将另一个图像放在顶部，并带有半透明背景 png。

（而且我认为你应该使用质量更好的图像，因为你的照片看起来很奇怪）

                let iconWhite: UIImage? = self.load(fileName: "APP/icones/\(iconName).png")?.withRenderingMode(UIImage.RenderingMode.alwaysOriginal)
                        
                        
        //UNSELECT IMAGE
                        var unselectedImgBack = UIImage(named: "white.png")
                        var unselectedImgFront = iconWhite?.overlayImage(color: UIColor.black)
                        
                        let size = unselectedImgFront?.size
                        unselectedImgBack = unselectedImgBack?.resized(to: size!)
                        UIGraphicsBeginImageContext(size!)
                        let areaSize = CGRect(x: 0, y: 0, width: size!.width, height: size!.height)
                        unselectedImgBack!.draw(in: areaSize)
                        unselectedImgFront!.draw(in: areaSize, blendMode: .normal, alpha: 1)
                        unselectedImgFront = UIGraphicsGetImageFromCurrentImageContext()!
                        UIGraphicsEndImageContext()
                        
                        let unselectedImage =  unselectedImgFront!.withRenderingMode(UIImage.RenderingMode.alwaysOriginal)
                        
        //SELECT IMAGE
                        
                        var selectedImgBack = UIImage(named: "white.png")
                        var selectedImgFront = iconWhite
                        
                        let scanner2 = Scanner(string: color)
                        var value: UInt64 = 0
                        
                        if scanner2.scanHexInt64(&value) {
                            print("Decimal: \(value)")
                            print("Hex: 0x\(String(value, radix: 16))")
                        }
                        selectedImgBack = selectedImgBack?.overlayImage(color: UIColor.init(rgb: Int(value)))

                        selectedImgBack = selectedImgBack?.resized(to: size!)
                        UIGraphicsBeginImageContext(size!)
                        selectedImgBack!.draw(in: areaSize)
                        selectedImgFront!.draw(in: areaSize, blendMode: .normal, alpha: 0.8)
                        selectedImgFront = UIGraphicsGetImageFromCurrentImageContext()!
                        UIGraphicsEndImageContext()
                        
                        let selectedImage = selectedImgFront!.withRenderingMode(UIImage.RenderingMode.alwaysOriginal)

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