表情符号由2个unicodeScalars U + 1F44D,U + 1F3FC组成。
如何将其识别为1'显示'表情符号,因为它将在iOS上显示?
答案 0 :(得分:18)
更新Swift 4(Xcode 9)
从Swift 4开始,“表情符号序列”被视为单个字素 集群(根据Unicode 9标准):
let s = "ab❤️"
print(s.count) // 4
因此不再需要其他解决方法了。
(Swift 3及更早版本的旧答案:)
一个可能的选择是枚举和计算 字符串中的“组合字符序列”:
let s = "ab❤️"
var count = 0
s.enumerateSubstringsInRange(s.startIndex..<s.endIndex,
options: .ByComposedCharacterSequences) {
(char, _, _, _) in
if let char = char {
count += 1
}
}
print(count) // 4
另一种选择是找到组合字符的范围 给定指数的序列:
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
}
}
示例:
"".composedCharacterCount // 1
"".characters.count // 2
"❤️".composedCharacterCount // 1
"❤️".characters.count // 4
"".composedCharacterCount // 2
"".characters.count // 1
如您所见,Swift字符(扩展字形集群)的数量可以或更少 组合字符序列的数量。