我正在构建一个iOS应用程序,而Emojis在其中扮演很重要的角色.
In iOS 10.2,new emojis were released.
我很确定,如果有人有iOS 8,例如,他们实际上不会看到这些emojis.有没有办法检测这个？我正在努力动态地构建用户iOS版本支持的所有Emojis的列表,但是我有一些麻烦.
解决方法
>要知道给定设备或操作系统上是否有几个表情符号或Unicode字符可用,您可以在下面运行emojiAvailable()方法.
它通过将给定的字符图像与已知的无效字符1f3f6进行比较来工作.
>为了制作一些表单或unicode字符,可以在循环中调用characterData(),如batchtest()所示.通过缓存无效字符1f3f6一次,效率略高一些.
第一个例子：测试3个表情符号
let codes:[Character] = ["\u{2764}","\u{1f600}","\u{1F544}"] // change that
for code in codes {
print("\(code) : \(emojiAvailable(code))")
}
第二个例子：测试几百个表情符号
func batchtest() {
let refCode = Character("\u{1f3f6}") // do not change this
if let refData = characterData(refCode) {
for Emojicode in 0x1f300...0x1f600 { // change that
let emojiCharacter = Character(UnicodeScalar(Emojicode)!)
if let testData = characterData(emojiCharacter) {
let valid = !(refData as NSData).isEqual(to: testData)
print("Emoji \(emojiCharacter) for code \(Emojicode) is valid: \(valid)")
}
}
}
}
emojiAvailable()
func emojiAvailable(_ Emojicode:Character) -> Bool
{
let refCode = Character("\u{1f3f6}") // do not change this
if let refData = characterData(refCode),let testData = characterData(Emojicode) {
return !(refData as NSData).isEqual(to: testData)
}
return false
}
字符到PNG
func characterData(_ char:Character) -> Data?
{
let attributes = [NSFontAttributeName: UIFont.systemFont(ofSize: 10)]
let charStr = "\(char)" as Nsstring
let size = charStr.size(attributes: attributes)
UIGraphicsBeginImageContext(size)
charStr.draw(at: CGPoint(x: 0,y :0),withAttributes: attributes)
var charData:Data? = nil
if let charImage = UIGraphicsGetimageFromCurrentimageContext() {
charData = UIImagePNGRepresentation(charImage)
}
UIGraphicsEndImageContext()
return charData
}
►要下载完整的项目,请查阅swiftarchitect.com上的Emoji & Unicode文章.