iOS ~ 判断字符是什么（Unicode）中文、英文、俄文等等

Unicode 字符百科

纯中文：

//是否是纯汉字
- (BOOL)isChinese {
    NSString *match = @"(^[\u4e00-\u9fa5]+$)";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF matches %@", match];
    return [predicate evaluateWithObject:self];
}

包含中文：

//是否包含汉字
- (BOOL)includeChinese {
    for(int i=0; i< [self length];i++)
    {
        int a =[self characterAtIndex:i];
        if( a >0x4e00&& a <0x9fff){
            return YES;
        }
    }
    return NO;
}

英文：

//  判断是否以字母开头
- (BOOL)isEnglishFirst:(NSString *)str {
    NSString *regular = @"^[A-Za-z].+$";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regular];
    
    if ([predicate evaluateWithObject:str] == YES){
        return YES;
    }else{
        return NO;
    }
}

俄文：

// 判断一个字符是否是字母
+(BOOL)JudgeString:(NSString *)string {

    NSString *regex =@"^[\u0410-\u044F]+$";
    
    NSPredicate*predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
    return[predicate evaluateWithObject:string];
}