近期开发中,发现如果输入文本中有表情上传服务器失败,因此整理一下禁止用户输入表情的方法,网上的帖子中不能禁止所有表情符,比如⚽️,🤵等,因此在此做了整理.
首先创建NSString的分类,在其中添加判断是否含有表情符的方法
//判断是否含有表情符号 yes-有 no-没有
+ (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) {
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 (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 (substring.length > 1) {
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3) {
returnValue =YES;
}
}
}
if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50 || hs == 0xd83e) {
returnValue =YES;
}
}
}];
return returnValue;
}
//是否是系统自带九宫格输入 yes-是 no-不是
+ (BOOL)isNineKeyBoard:(NSString *)string {
NSString *other = @"➋➌➍➎➏➐➑➒";
int len = (int)string.length;
for(int i=0;i<len;i++){
if(!([other rangeOfString:string].location != NSNotFound))
return NO;
}
return YES;
}
//判断第三方键盘中的表情
+ (BOOL)hasEmoji:(NSString*)string {
NSString *pattern = @"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
BOOL isMatch = [pred evaluateWithObject:string];
return isMatch;
}
//去除表情
+ (NSString *)disableEmoji:(NSString *)text {
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]"options:NSRegularExpressionCaseInsensitive error:nil];
NSString *modifiedString = [regex stringByReplacingMatchesInString:text options:0 range:NSMakeRange(0, [text length]) withTemplate:@""];
return modifiedString;
}
1.使用的时候在textFiled的代理方法中判断当前是否是表情键盘,如果当前显示的是表情键盘的话禁止输入
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
if ([[textField.textInputMode primaryLanguage] isEqualToString:@"emoji"] || ![textField.textInputMode primaryLanguage]) {
return NO;
}
return YES;
}
2.创建监听键盘改变的方法,在此方法中过滤表情
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldDidChanged:) name:@"UITextFieldTextDidChangeNotification" object:_inputView.inputTextField];
- (void)textFieldDidChanged:(NSNotification *)obj {
//过滤表情符
if ([NSString stringContainsEmoji:toBeString] || [NSString hasEmoji:toBeString]) {
textFiled.text = [NSString disableEmoji:toBeString];
}
}
-(void)dealloc{
[[NSNotificationCenter defaultCenter] removeObserver:self name:@"UITextFieldTextDidChangeNotification" object:_inputView.inputTextField];
}
当然了你也可以对将要进行传输的数据编码,然后接受服务器数据再反编码展示.
