Question

我想创建像下面的图像你可以帮助我任何代码如何使它四舍五入谢谢你的帮助！

Answer 1

我认为你需要

（可选）如果图像大于标准条按钮图像大小，请调整图像大小）
使图像成为圆形

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!
}
}

使用示例：

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

我改变并为@firstinq回答添加了一个新功能。这种方式适合我。

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

Answer 3

 (async function() {
   // Get the first token to start:
   let tokenPromise = retrieveToken();
   // Update the token sometimes:
   setInterval(() => tokenPromise = retrieveToken(), 10000);
   // Retrieve the data
   for(let i = 1, i < 10; i++)
     await retrieveContacts(25, i, await tokenPromise);
 })();

如何以编程方式在swift中舍入UItabbar图像

3 个答案: