雨燕4.2

Question

我需要所有Apple Emojis。
我可以通过从网站getemoji复制它们来获取所有表情符号并将它们放入 String 但是在我的应用程序中我需要表情符号的表情符号为图像。

有没有一种很好的方法将我复制的表情符号转换为字符串转换为 UIImage ？
或者是一个更好的解决方案，以正确的顺序获得所有Apple表情符号？

Answer 1

更新了Swift 4.1

将此扩展程序添加到您的项目中

import UIKit

extension String {
    func image() -> UIImage? {
        let size = CGSize(width: 40, height: 40)
        UIGraphicsBeginImageContextWithOptions(size, false, 0)
        UIColor.white.set()
        let rect = CGRect(origin: .zero, size: size)
        UIRectFill(CGRect(origin: .zero, size: size))
        (self as AnyObject).draw(in: rect, withAttributes: [.font: UIFont.systemFont(ofSize: 40)])
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}

上面的代码将当前String绘制为具有白色背景颜色的图像上下文，最后将其转换为UIImage。

现在你可以写

了

实施例

给出一个范围列表，指示表情符号的unicode值

let ranges = [0x1F601...0x1F64F, 0x2702...0x27B0]

您可以将其转换为图像列表

let images = ranges
    .flatMap { $0 }
    .compactMap { Unicode.Scalar($0) }
    .map(Character.init)
    .compactMap { String($0).image() }

结果：

我无法保证范围列表已完成，您需要自己搜索

Answer 2

Swift 4也是如此：

extension String {
    func emojiToImage() -> UIImage? {
        let size = CGSize(width: 30, height: 35)
        UIGraphicsBeginImageContextWithOptions(size, false, 0)
        UIColor.white.set()
        let rect = CGRect(origin: CGPoint(), size: size)
        UIRectFill(rect)
        (self as NSString).draw(in: rect, withAttributes: [NSAttributedStringKey.font: UIFont.systemFont(ofSize: 30)])
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}

Answer 3

更新了Swift 3.0.1的 @Luca Angeletti 答案

extension String {

    func image() -> UIImage? {
        let size = CGSize(width: 30, height: 35)
        UIGraphicsBeginImageContextWithOptions(size, false, 0);
        UIColor.white.set()
        let rect = CGRect(origin: CGPoint(), size: size)
        UIRectFill(CGRect(origin: CGPoint(), size: size))
        (self as NSString).draw(in: rect, withAttributes: [NSFontAttributeName: UIFont.systemFont(ofSize: 30)])
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }

}

Answer 4

雨燕4.2

我真的很喜欢@Luca Angeletti解决方案。关于透明背景，我和@jonauz有相同的问题。因此，通过小的修改，您将得到相同的东西，但背景颜色清晰。

我没有代表在评论中回答。

import UIKit

extension String {
    func emojiToImage() -> UIImage? {
        let size = CGSize(width: 30, height: 35)
        UIGraphicsBeginImageContextWithOptions(size, false, 0)
        UIColor.clear.set()
        let rect = CGRect(origin: CGPoint(), size: size)
        UIRectFill(CGRect(origin: CGPoint(), size: size))
        (self as NSString).draw(in: rect, withAttributes: [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 30)])
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}

Answer 5

这是更新的答案，其中包含以下更改：

居中：使用draw(at:withAttributes:)而非draw(in:withAttributes:)将文本居中显示在所得UIImage中
正确的大小：使用size(withAttributes:)来生成与字体的实际大小相关的大小的UIImage。
评论：添加了评论，以便更好地理解
快速版本 3.2

import UIKit
extension String {
    func textToImage() -> UIImage? {
        let nsString = (self as NSString)
        let font = UIFont.systemFont(ofSize: 1024) // you can change your font size here
        let stringAttributes = [NSFontAttributeName: font]
        let imageSize = nsString.size(attributes: stringAttributes)

        UIGraphicsBeginImageContextWithOptions(imageSize, false, 0) //  begin image context
        UIColor.clear.set() // clear background
        UIRectFill(CGRect(origin: CGPoint(), size: imageSize)) // set rect size
        nsString.draw(at: CGPoint.zero, withAttributes: stringAttributes) // draw text within rect
        let image = UIGraphicsGetImageFromCurrentImageContext() // create image from context
        UIGraphicsEndImageContext() //  end image context

        return image ?? UIImage()
    }
}

Answer 6

雨燕5 ：（带有可选的fontSize，imageSize和bgColor）

像这样使用它：

let image      = "?".image()
let imageLarge = "?".image(fontSize:100)
let imageBlack = "?".image(fontSize:100, bgColor:.black)
let imageLong  = "?".image(fontSize:100, imageSize:CGSize(width:500,height:100))


import UIKit

extension String
{
    func image(fontSize:CGFloat = 40, bgColor:UIColor = UIColor.clear, imageSize:CGSize? = nil) -> UIImage?
    {
        let font = UIFont.systemFont(ofSize: fontSize)
        let attributes = [NSAttributedString.Key.font: font]
        let imageSize = imageSize ?? self.size(withAttributes: attributes)

        UIGraphicsBeginImageContextWithOptions(imageSize, false, 0)
        bgColor.set()
        let rect = CGRect(origin: .zero, size: imageSize)
        UIRectFill(rect)
        self.draw(in: rect, withAttributes: [.font: font])
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}

Answer 7

使用UIGraphicsImageRenderer的@Luca Angeletti答案的更新版本：

extension String {
    func image() -> UIImage? {
        let size = CGSize(width: 100, height: 100)
        let rect = CGRect(origin: CGPoint(), size: size)
        return UIGraphicsImageRenderer(size: size).image { (context) in
            (self as NSString).draw(in: rect, withAttributes: [.font : UIFont.systemFont(ofSize: 100)])
        }
    }
}

Answer 8

此变体基于@Luca's接受的答案，但允许您有选择地自定义字体的磅值，应产生居中的图像，并且不会使背景颜色变白。

extension String {
    func image(pointSize: CGFloat = UIFont.systemFontSize) -> UIImage? {
        let nsString = self as NSString
        let font = UIFont.systemFont(ofSize: pointSize)

        let size = nsString.size(withAttributes: [.font: font])
        UIGraphicsBeginImageContextWithOptions(size, false, 0)
        let rect = CGRect(origin: .zero, size: size)
        nsString.draw(in: rect, withAttributes: [.font: font])
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}

将Apple Emoji（String）转换为UIImage

8 个答案:

更新了Swift 4.1

实施例

雨燕4.2