如何以编程方式在swift中舍入UItabbar图像

Question

我想创建像图像一样的东西如下你能帮助我任何代码如何使它圆润感谢你的帮助!

Answer 1

我想你需要

1. (可选)如果图像大于标准条按钮图像大小,请调整图像大小)
2. 使图像圆

在将其用作UItabBarItem图像之前.下面是UIImage的扩展,具有以下两个功能:

extension UIImage{
var roundedImage: UIImage {
    let rect = CGRect(origin:CGPoint(x: 0, y: 0), size: self.size)
    UIGraphicsBeginImageContextWithOptions(self.size, false, 1)
    UIBezierPath(
        roundedRect: rect,
        cornerRadius: self.size.height
        ).addClip()
    self.draw(in: rect)
    return UIGraphicsGetImageFromCurrentImageContext()!
}
func resizedImage(newWidth: CGFloat) -> UIImage {
    let scale = newWidth / self.size.width
    let newHeight = self.size.height * scale
    UIGraphicsBeginImageContext(CGSize(width: newWidth, height: newHeight))
    self.draw(in: CGRect(x: 0, y: 0, width: newWidth, height: newHeight))
    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    return newImage!
}
}

用法示例:

let barImage: UIImage = UIImage(named: "avatar_copy.png")!.resizedImage(newWidth: 40).roundedImage.withRenderingMode(.alwaysOriginal)
let roundTabBar = UITabBarItem(title: nil, image: barImage.withRenderingMode(.alwaysOriginal), selectedImage: barImage)        
self.bottomTabbar.items = [roundTabBar]

Answer 2

我更改了 @firstinq 答案并添加了一个新函数。这种方法对我有用。

extension UIImage{

    var roundMyImage: UIImage {
        let rect = CGRect(origin:CGPoint(x: 0, y: 0), size: self.size)
        UIGraphicsBeginImageContextWithOptions(self.size, false, 1)
        UIBezierPath(
            roundedRect: rect,
            cornerRadius: self.size.height
            ).addClip()
        self.draw(in: rect)
        return UIGraphicsGetImageFromCurrentImageContext()!
    }
    func resizeMyImage(newWidth: CGFloat) -> UIImage {
        let scale = newWidth / self.size.width
        let newHeight = self.size.height * scale
        UIGraphicsBeginImageContext(CGSize(width: newWidth, height: newHeight))

        self.draw(in: CGRect(x: 0, y: 0, width: newWidth, height: newHeight))
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return newImage!
    }
    func squareMyImage() -> UIImage {
        UIGraphicsBeginImageContext(CGSize(width: self.size.width, height: self.size.width))

        self.draw(in: CGRect(x: 0, y: 0, width: self.size.width, height: self.size.width))

        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return newImage!
    }
}

在 TabBarController 中我将其更改为：

let barImage: UIImage = UIImage(named: "landingpage_image2")!.squareMyImage().resizeMyImage(newWidth: 40).roundMyImage.withRenderingMode(.alwaysOriginal)

self.tabBar.items?[1].image = barImage