检测字符串包含emoji表情
有时候在开发时会遇到不希望字符串中包含emoji表情的情况，Google之后发现了方法，但是似乎iOS9之后的emoji无法过滤，继续寻找方法，在一个NSString的扩展中发现了办法
#import
/**
Category to search emojis on an NSString.
The category allows to check if has emojis, the number of emojis and the range of the emojis.
*/
@interface NSString (EMOEmoji)
/**
Calculate the NSRange for every emoji on the string.
@return array with the range for every emoji.
*/
- (NSArray *)emo_emojiRanges;
/**
Calculate if the string has any emoji.
@return YES if the string has emojis, No otherwise.
*/
- (BOOL)emo_containsEmoji;
/**
Calculate if the string consists entirely of emoji.
@return YES if the string consists entirely of emoji, No otherwise.
*/
- (BOOL)emo_isPureEmojiString;
/**
Calculate number of emojis on the string.
@return the total number of emojis.
*/
- (NSInteger)emo_emojiCount;
@end #import "NSString+EMOEmoji.h"
@implementation NSString (EMOEmoji)
#pragma mark - EmojiRanges
- (NSArray *)emo_emojiRanges
{
__block NSMutableArray *emojiRangesArray = [NSMutableArray new];
[self enumerateSubstringsInRange:NSMakeRange(0,
[self length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString *substring,
NSRange substringRange,
NSRange enclosingRange,
BOOL *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 <= 0x1f9c0)
{
[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];
}
}
}
else if (substring.length > 1)
{
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3 ||
ls == 0xfe0f ||
ls == 0xd83c)
{
[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];
}
}
else
{
// non surrogate
if (0x2100 <= hs &&
hs <= 0x27ff)
{
[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];
}
else if (0x2B05 <= hs &&
hs <= 0x2b07)
{
[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];
}
else if (0x2934 <= hs &&
hs <= 0x2935)
{
[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];
}
else if (0x3297 <= hs &&
hs <= 0x3299)
{
[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];
}
else if (hs == 0xa9 ||
hs == 0xae ||
hs == 0x303d ||
hs == 0x3030 ||
hs == 0x2b55 ||
hs == 0x2b1c ||
hs == 0x2b1b ||
hs == 0x2b50)
{
[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];
}
}
}];
return emojiRangesArray;
}
#pragma mark - ContainsEmoji
- (BOOL)emo_containsEmoji
{
__block BOOL containsEmoji = NO;
[self enumerateSubstringsInRange:NSMakeRange(0,
[self length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString *substring,
NSRange substringRange,
NSRange enclosingRange,
BOOL *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 <= 0x1f9c0)
{
containsEmoji = YES;
}
}
}
else if (substring.length > 1)
{
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3 ||
ls == 0xfe0f ||
ls == 0xd83c)
{
containsEmoji = YES;
}
}
else
{
// non surrogate
if (0x2100 <= hs &&
hs <= 0x27ff)
{
containsEmoji = YES;
}
else if (0x2B05 <= hs &&
hs <= 0x2b07)
{
containsEmoji = YES;
}
else if (0x2934 <= hs &&
hs <= 0x2935)
{
containsEmoji = YES;
}
else if (0x3297 <= hs &&
hs <= 0x3299)
{
containsEmoji = YES;
}
else if (hs == 0xa9 ||
hs == 0xae ||
hs == 0x303d ||
hs == 0x3030 ||
hs == 0x2b55 ||
hs == 0x2b1c ||
hs == 0x2b1b ||
hs == 0x2b50)
{
containsEmoji = YES;
}
}
if (containsEmoji)
{
*stop = YES;
}
}];
return containsEmoji;
}
#pragma mark - PureEmojiString
- (BOOL)emo_isPureEmojiString
{
if (self.length == 0) {
return NO;
}
__block BOOL isPureEmojiString = YES;
[self enumerateSubstringsInRange:NSMakeRange(0,
[self length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString *substring,
NSRange substringRange,
NSRange enclosingRange,
BOOL *stop)
{
BOOL containsEmoji = NO;
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 <= 0x1f9c0)
{
containsEmoji = YES;
}
}
}
else if (substring.length > 1)
{
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3 ||
ls == 0xfe0f ||
ls == 0xd83c)
{
containsEmoji = YES;
}
}
else
{
// non surrogate
if (0x2100 <= hs &&
hs <= 0x27ff)
{
containsEmoji = YES;
}
else if (0x2B05 <= hs &&
hs <= 0x2b07)
{
containsEmoji = YES;
}
else if (0x2934 <= hs &&
hs <= 0x2935)
{
containsEmoji = YES;
}
else if (0x3297 <= hs &&
hs <= 0x3299)
{
containsEmoji = YES;
}
else if (hs == 0xa9 ||
hs == 0xae ||
hs == 0x303d ||
hs == 0x3030 ||
hs == 0x2b55 ||
hs == 0x2b1c ||
hs == 0x2b1b ||
hs == 0x2b50)
{
containsEmoji = YES;
}
}
if (!containsEmoji)
{
isPureEmojiString = NO;
*stop = YES;
}
}];
return isPureEmojiString;
}
#pragma mark - EmojiCount
- (NSInteger)emo_emojiCount
{
__block NSInteger emojiCount = 0;
[self enumerateSubstringsInRange:NSMakeRange(0,
[self length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString *substring,
NSRange substringRange,
NSRange enclosingRange,
BOOL *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 <= 0x1f9c0)
{
emojiCount = emojiCount + 1;
}
}
}
else if (substring.length > 1)
{
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3 ||
ls == 0xfe0f ||
ls == 0xd83c)
{
emojiCount = emojiCount + 1;
}
}
else
{
// non surrogate
if (0x2100 <= hs &&
hs <= 0x27ff)
{
emojiCount = emojiCount + 1;
}
else if (0x2B05 <= hs &&
hs <= 0x2b07)
{
emojiCount = emojiCount + 1;
}
else if (0x2934 <= hs &&
hs <= 0x2935)
{
emojiCount = emojiCount + 1;
}
else if (0x3297 <= hs &&
hs <= 0x3299)
{
emojiCount = emojiCount + 1;
}
else if (hs == 0xa9 ||
hs == 0xae ||
hs == 0x303d ||
hs == 0x3030 ||
hs == 0x2b55 ||
hs == 0x2b1c ||
hs == 0x2b1b ||
hs == 0x2b50)
{
emojiCount = emojiCount + 1;
}
}
}];
return emojiCount;
}
@end
ps:扩展的链接是https://github.com/woxtu/NSString-RemoveEmoji 感谢作者