如何知道两个表情符号是否将显示为一个表情符号?
表情符号of由2个unicodeScalars????U + 1F44D,????U + 1F3FC组成。
如何将其标识为1个“显示的”表情符号,因为它将在iOS上显示为此类?
回答:
从Swift 4开始,“表情符号序列”被视为单个字素簇(根据Unicode 9标准):
let s = "a????????b????❤️????????"print(s.count) // 4
因此不再需要其他解决方法。
(Swift 3和更早版本的旧答案:)
一个可能的选择是枚举并计算字符串中的“组成字符序列”:
let s = "a????????b????❤️????????"var count = 0
s.enumerateSubstringsInRange(s.startIndex..<s.endIndex,
options: .ByComposedCharacterSequences) {
(char, _, _, _) in
if let char = char {
count += 1
}
}
print(count) // 4
另一个选择是在给定索引下找到组成的字符序列的范围:
let s = "????❤️????????"if s.rangeOfComposedCharacterSequenceAtIndex(s.startIndex) == s.characters.indices {
print("This is a single composed character")
}
作为String
扩展方法:
// Swift 2.2:extension String {
var composedCharacterCount: Int {
var count = 0
enumerateSubstringsInRange(characters.indices, options: .ByComposedCharacterSequences) {
(_, _, _, _) in count += 1
}
return count
}
var isSingleComposedCharacter: Bool {
return rangeOfComposedCharacterSequenceAtIndex(startIndex) == characters.indices
}
}
// Swift 3:
extension String {
var composedCharacterCount: Int {
var count = 0
enumerateSubstrings(in: startIndex..<endIndex, options: .byComposedCharacterSequences) {
(_, _, _, _) in count += 1
}
return count
}
var isSingleComposedCharacter: Bool {
return rangeOfComposedCharacterSequence(at: startIndex) == startIndex..<endIndex
}
}
例子:
"????????".composedCharacterCount // 1"????????".characters.count // 2
"????❤️????????".composedCharacterCount // 1
"????❤️????????".characters.count // 4
"????????????????".composedCharacterCount // 2
"????????????????".characters.count // 1
如您所见,Swift字符(扩展的字素簇)的数量可以大于 或小于 组成的字符序列的数量。
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