我们知道emoji表情是一些特殊格式的字符串，因此我们在计算其长度的时候直接用“xxx.length”即可，但有时候产品经理会要求你把所有的emoji表情都当做一个字符处理，别问我怎么知道的😭😭😭，这里写下来希望大家不要跟我一样到处跳坑
还是直接上代码
1.获取emoji个数（我这里写到了NSString的类方法中）
+ (NSInteger)emojiCountInString:(NSString *)string
{
__block NSInteger num = 0;
[string enumerateSubstringsInRange:NSMakeRange(0, [string length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString * _Nullable substring, NSRange substringRange, NSRange enclosingRange, BOOL * _Nonnull stop) {
const unichar hs = [substring characterAtIndex:0];
if (0xd800 <= hs && hs <= 0xdbff){
if (substring.length > 1) {
const unichar ls = [substring characterAtIndex:1];
const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
if (0x1d000 <= uc && uc <= 0x1f918)
{
num += 1;
}
}
}
else if (substring.length > 1)
{
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3 || ls == 0xFE0F || ls == 0xd83c)
{
num += 1;
}
}
else{
// non surrogate
if (0x2100 <= hs && hs <= 0x27ff)
{
if (0x278b <= hs && 0x2792 >= hs)
{
//不为emoji
}
else
{
num += 1;
}
}
else if (0x2B05 <= hs && hs <= 0x2b07)
{
num += 1;
}
else if (0x2934 <= hs && hs <= 0x2935)
{
num += 1;
}
else if (0x3297 <= hs && hs <= 0x3299)
{
num += 1;
}
else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50 || hs == 0xd83e)
{
num += 1;
}
}
}];
return num;
}
2.字符串去掉emoji
+ (NSString *)getStringWithoutEmoji:(NSString *)string
{
__block NSString *tempStr = string;
[string enumerateSubstringsInRange:NSMakeRange(0, [string length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString * _Nullable substring, NSRange substringRange, NSRange enclosingRange, BOOL * _Nonnull stop) {
const unichar hs = [substring characterAtIndex:0];
// surrogate pair
if (0xd800 <= hs && hs <= 0xdbff)
{
if (substring.length > 1)
{
const unichar ls = [substring characterAtIndex:1];
const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
if (0x1d000 <= uc && uc <= 0x1f918)
{
tempStr = [tempStr stringByReplacingOccurrencesOfString:substring withString:@""];
}
}
}
else if (substring.length > 1)
{
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3 || ls == 0xFE0F || ls == 0xd83c)
{
tempStr = [tempStr stringByReplacingOccurrencesOfString:substring withString:@""];
}
}
else
{
// non surrogate
if (0x2100 <= hs && hs <= 0x27ff)
{
if (0x278b <= hs && 0x2792 >= hs)
{
//不为emoji
}
else
{
tempStr = [tempStr stringByReplacingOccurrencesOfString:substring withString:@""];
}
}
else if (0x2B05 <= hs && hs <= 0x2b07)
{
tempStr = [tempStr stringByReplacingOccurrencesOfString:substring withString:@""];
}
else if (0x2934 <= hs && hs <= 0x2935)
{
tempStr = [tempStr stringByReplacingOccurrencesOfString:substring withString:@""];
}
else if (0x3297 <= hs && hs <= 0x3299)
{
tempStr = [tempStr stringByReplacingOccurrencesOfString:substring withString:@""];
}
else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50 || hs == 0xd83e)
{
tempStr = [tempStr stringByReplacingOccurrencesOfString:substring withString:@""];
}
}
}];
return tempStr;
}
3.获取把emoji表情当成单个字符长度处理后的字符串长度
-(NSInteger)lengthWithEmojiString{
NSInteger emojiLen = [NSString emojiCountInString:self];
NSString * normalStr = [NSString getStringWithoutEmoji:self];
NSInteger strLengh = normalStr.length+emojiLen;
return strLengh;
}
