最近在做项目遇到一个问题，用户在输入信息是时候，带有表情的话，服务器那边会出现乱码，后来决定禁止用户输入表情，在网上搜了下面的方法：
+ (BOOL)stringContainsEmoji:(NSString *)string
{
__block BOOL returnValue = NO;
[string enumerateSubstringsInRange:NSMakeRange(0, [string length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *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 <= 0x1f77f) {
returnValue = YES;
}
}
} else if (substring.length > 1) {
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3) {
returnValue = YES;
}
} else {
if (0x2100 <= hs && hs <= 0x27ff) {
returnValue = YES;
} else if (0x2B05 <= hs && hs <= 0x2b07) {
returnValue = YES;
} else if (0x2934 <= hs && hs <= 0x2935) {
returnValue = YES;
} else if (0x3297 <= hs && hs <= 0x3299) {
returnValue = YES;
} else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {
returnValue = YES;
}
}
}];
return returnValue;
}
但是后来发现这个方法没法监听到键盘联想提示的emoji表情，很可恼，最后只能监听textView文本变化，然后判断里面是否有emoji表情，再把它替换了 下面是实现代码：
+ (NSString *)disableEmoji:(NSString *)text
{
NSRegularExpression *regular = [[NSRegularExpression alloc] initWithPattern:@"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]" options:NSRegularExpressionCaseInsensitive error:nil];
NSString *modifiedString = [regular stringByReplacingMatchesInString:text options:NSMatchingReportProgress range:NSMakeRange(0, [text length]) withTemplate:@""];
return modifiedString;
}
调用：
#pragma mark - UITextViewDelegate
- (void)textViewDidChange:(UITextView *)textView {
UITextRange *textTange = textView.selectedTextRange;
if (![textView.text isEqualToString:[NSString disableEmoji:textView.text]]) {
textView.text = [NSString disableEmoji:textView.text];
}
textView.selectedTextRange = textTange;
}
这样就能比较完美的替换键盘输入的emoji表情了，另外我很想知道简书是怎么样排版代码的！？
