项目中需要禁止UITextView以及UITextField输入表情符号的需求,直接上代码
1、首先上判断字符串是否含有表情符号的代码
/**
* 判断字符串中是否存在emoji
* @param string 字符串
* @return YES(含有表情)
*/
- (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];
// 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 <= 0x1f77f) {
returnValue = YES;
}
}
} else if (substring.length > 1) {
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3) {
returnValue = YES;
}
} else {
// non surrogate
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;
}
/**
* 判断字符串中是否存在emoji
* @param string 字符串
* @return YES(含有表情)
*/
- (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;
}
2、然后是去除字符串中的表情
//去除字符串中所带的表情
- (NSString *)disable_emoji:(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;
}
3、由于苹果系统自带的九宫格输入汉字的过程中也会默认是表情符号，因此需要添加判断当前是否是九宫格键盘
/**
判断是不是九宫格
@param string 输入的字符
@return YES(是九宫格拼音键盘)
*/
-(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;
}
首先实现UITextView的禁止输入表情符号代码
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{
if ([textView isFirstResponder]) {
//判断键盘是不是九宫格键盘
if ([self isNineKeyBoard:text] ){
return YES;
}else{
if ([self hasEmoji:text] || [self stringContainsEmoji:text]){
[self LGShowMsg:ForbiddenMsg]; // 提示框
return NO;
}
}
if ([[[textView textInputMode] primaryLanguage] isEqualToString:@"emoji"] || ![[textView textInputMode] primaryLanguage]) {
[self LGShowMsg:ForbiddenMsg]; // 提示框
return NO;
}
}
if ([text isEqualToString:@"\n"]) {
[textView resignFirstResponder];
return NO;
}
return YES;
}
- (void)textViewDidChange:(UITextView *)textView
{
if (textView.text.length > 0 && [self stringContainsEmoji:textView.text]) {
[self LGShowMsg:ForbiddenMsg]; // 提示框
NSLog(@"有表情");
// 禁止系统表情的输入
NSString *text = [self disable_emoji:[textView text]];
if (![text isEqualToString:textView.text]) {
NSRange textRange = [textView selectedRange];
textView.text = text;
[textView setSelectedRange:textRange];
}
}
}
-(void)textViewDidEndEditing:(UITextView *)textView
{
if ([self stringContainsEmoji:textView.text]) {
[self LGShowMsg:@"禁止输入表情,请重新输入"];
NSLog(@"有表情");
}
}
然后实现UITextField的禁止输入表情符号代码
- (void)textFieldDidEndEditing:(UITextField *)textField
{
if ([self stringContainsEmoji:textField.text]) {
[self LGShowMsg:@"禁止输入表情,请重新输入"];
NSLog(@"有表情");
}
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if ([textField isFirstResponder]) {
//判断键盘是不是九宫格键盘
if ([self isNineKeyBoard:string] ){
return YES;
}else{
if ([self hasEmoji:string] || [self stringContainsEmoji:string]){
[self LGShowMsg:ForbiddenMsg];
return NO;
}
}
if ([[[textField textInputMode] primaryLanguage] isEqualToString:@"emoji"] || ![[textField textInputMode] primaryLanguage]) {
[self LGShowMsg:ForbiddenMsg];
return NO;
}
}
if ([string isEqualToString:@"\n"]) {
[textField resignFirstResponder];
return NO;
}
return YES;
return YES;
}
- (void)textFieldDidChange:(UITextField *)TextField
{
if (TextField.text.length > 0 && [self stringContainsEmoji:TextField.text]) {
[self LGShowMsg:ForbiddenMsg];
NSLog(@"有表情");
// 禁止系统表情的输入
NSString *text = [self disable_emoji:[TextField text]];
TextField.text = text;
}
}