Emoji Picker Ios Swift

Question

我最近看到一个应用程序，它包含了一个表情选择器，作为对某些事情作出反应的一种方式。我想在我的应用程序中实现一个类似的概念，任何人都知道我如何创建这张照片。我正在考虑使用一个集合视图，让每个单元格都是自己的表情符号。有什么想法或者更好的方法？

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Answer 1

若要将表情符号放入collectionView，请执行以下操作：

var emojiList: [[String]] = []
let sectionTitle: [String] = ["Emoticons", "Dingbats", "Transport and map symbols", "Enclosed Characters"]

override func layoutSubviews() {
    super.layoutSubviews()
    fetchEmojis()
}

func fetchEmojis(){

    let emojiRanges = [
        0x1F601...0x1F64F,
        0x2702...0x27B0,
        0x1F680...0x1F6C0,
        0x1F170...0x1F251
    ]

    for range in emojiRanges {
        var array: [String] = []
        for i in range {
            if let unicodeScalar = UnicodeScalar(i){
                array.append(String(describing: unicodeScalar))
            }
        }

        emojiList.append(array)
    }
}


override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! DragCell
    cell.imageView.image = emojiList[indexPath.section][indexPath.item].image()
    return cell
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return emojiList[section].count
}

func numberOfSections(in collectionView: UICollectionView) -> Int {
    return emojiList.count
}

此分机如下：

extension String {

    func image() -> UIImage? {
        let size = CGSize(width: 100, height: 100)
        UIGraphicsBeginImageContextWithOptions(size, false, 0);
        UIColor.clear.set()

        let stringBounds = (self as NSString).size(withAttributes: [NSAttributedStringKey.font: UIFont.systemFont(ofSize: 75)])
        let originX = (size.width - stringBounds.width)/2
        let originY = (size.height - stringBounds.height)/2
        print(stringBounds)
        let rect = CGRect(origin: CGPoint(x: originX, y: originY), size: size)
        UIRectFill(rect)

        (self as NSString).draw(in: rect, withAttributes: [NSAttributedStringKey.font: UIFont.systemFont(ofSize: 75)])

        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }

}

请记住，unicode表情符号范围可能不包括所有的表情符号，您可能需要查找和修改应用程序的范围。