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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