IOS 禁止用户将键盘切换到 Emoji 表情
func searchBar(_ searchBar: UISearchBar, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
// [S] 禁止用户切换键盘为Emoji表情
if searchBar.isFirstResponder {
if searchBar.textInputMode?.primaryLanguage == "emoji" || searchBar.textInputMode?.primaryLanguage == nil {
return false;
}
}
// [E] 禁止用户切换键盘为Emoji表情
return true;
}
检测文本中是否有 Emoji表情：
func stringContainsEmoji(string:String)->Bool{
var returnValue = false;
let Str = NSString(format: "%@", string);
Str.enumerateSubstrings(in: NSMakeRange(0, Str.length), options: NSString.EnumerationOptions.byComposedCharacterSequences) { (substring, substringRange, enclosingRange, stop) in
let subStr = NSString(format: "%@", substring!);
let hs = subStr.character(at: 0);
// surrogate pair
if (0xd800 <= hs && hs <= 0xdbff) {
if (subStr.length > 1) {
let ls = subStr.character(at: 1);
let uc = Int(((hs - 0xd800) * 0x400) + (ls - 0xdc00)) + 0x10000;
if (0x1d000 <= uc && uc <= 0x1f77f){
returnValue = true;
}
}
}
else if (subStr.length > 1) {
let ls = subStr.character(at: 1);
if (ls == 0x20e3){
returnValue = true;
}
}
else {
// non surrogate
if (0x2100 <= hs && hs <= 0x27ff){
returnValue = true;
}
else if (0x2B05 <= hs && hs <= 0x2b07){
returnValue = true;
}
else if (0x2934 <= hs && hs <= 0x2935){
returnValue = true;
}
else if (0x3297 <= hs && hs <= 0x3299){
returnValue = true;
}
else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50){
returnValue = true;
}
}
};
return returnValue;
}