又遇到输入框输入表情的情况了，之前写了一篇文章“UITextView/UITextField检测并过滤Emoji表情符号”http://www.jianshu.com/p/90d68e7e5d53,但是总觉得那两种方式都各有弊端，这次又遇到之后，仔细考虑了下之后，想到了用两种方式组合在一起使用，测试结果暂时没什么问题，在输入时就限制了emoji表情输入，完全符合需求。在此贴出代码，如果有什么问题，欢迎指正！
@interface JQTestViewController ()<UITextFieldDelegate>
@property (weak, nonatomic) IBOutlet UITextField *textField;
@property (nonatomic, assign) NSInteger textLocation;//这里声明一个全局属性，用来记录输入位置
@end
- (void)viewDidLoad {
[super viewDidLoad];
self.textField.delegate = self;
[self.textField addTarget:self action:@selector(textFieldDidChanged:) forControlEvents:UIControlEventEditingChanged];//注意：textFied没有textFieldDidChanged代理方法，但是有UITextFieldTextDidChangeNotification通知，这里添加通知方法，textView有textFieldDidChanged代理方法，下面用法一样
}
#pragma mark-- UITextFieldDelegate
//在输入时，调用下面那个方法来判断输入的字符串是否含有表情
- (void)textFieldDidChanged:(UITextField *)textField
{
if (textField.text.length > 20) {
textField.text = [textField.text substringToIndex:20];
[self showMessage:@"不可超过20字！"];
}else {
if (self.textLocation == -1) {
NSLog(@"输入不含emoji表情");
}else {
NSLog(@"输入含emoji表情");
//截取emoji表情前
textField.text = [textField.text substringToIndex:self.textLocation];
}
}
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSLog(@"location-->>%lu",(unsigned long)range.location);
NSLog(@"replacementString-->>%@",string);
//禁止输入emoji表情
if ([self stringContainsEmoji:string]) {
self.textLocation = range.location;
}else {
self.textLocation = -1;
}
return YES;
}
//表情符号的判断
- (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;
}
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|| code == 0x267B
|| code == 0x267F
|| (code >= 0x2692 && code <= 0x2694)
|| code == 0x2696 || code == 0x2697
|| code == 0x2699
|| code == 0x269B || code == 0x269C
|| code == 0x26A0 || code == 0x26A1
|| code == 0x26AA || code == 0x26AB
|| code == 0x26B0 || code == 0x26B1
|| code == 0x26BD || code == 0x26BE
|| code == 0x26C4 || code == 0x26C5
|| code == 0x26C8
|| code == 0x26CE
|| code == 0x26CF
|| code == 0x26D1
|| code == 0x26D3 || code == 0x26D4
|| code == 0x26E9 || code == 0x26EA
|| (code >= 0x26F0 && code <= 0x26F5)
|| (code >= 0x26F7 && code <= 0x26FA)
|| code == 0x26FD
|| code == 0x2702
|| code == 0x2705
|| (code >= 0x2708 && code <= 0x270D)
|| code == 0x270F
|| code == 0x2712
|| code == 0x2714
|| code == 0x2716
|| code == 0x271D
|| code == 0x2721
|| code == 0x2728
|| code == 0x2733 || code == 0x2734
|| code == 0x2744
|| code == 0x2747
|| code == 0x274C
|| code == 0x274E
|| (code >= 0x2753 && code <= 0x2755)
|| code == 0x2757
|| code == 0x2763 || code == 0x2764
|| (code >= 0x2795 && code <= 0x2797)
|| code == 0x27A1
|| code == 0x27B0
|| code == 0x27BF
|| code == 0x2934 || code == 0x2935
|| (code >= 0x2B05 && code <= 0x2B07)
|| code == 0x2B1B || code == 0x2B1C
|| code == 0x2B50
|| code == 0x2B55
|| code == 0x3030
|| code == 0x303D
|| code == 0x3297
|| code == 0x3299
// 第二段
|| code == 0x23F0) {
return YES;
}
return NO;
}
{
if (code == 0x0023
|| code == 0x002A
|| (code >= 0x0030 && code <= 0x0039)
|| code == 0x00A9
|| code == 0x00AE
|| code == 0x203C
|| code == 0x2049
|| code == 0x2122
|| code == 0x2139
|| (code >= 0x2194 && code <= 0x2199)
|| code == 0x21A9 || code == 0x21AA
|| code == 0x231A || code == 0x231B
|| code == 0x2328
|| code == 0x23CF
|| (code >= 0x23E9 && code <= 0x23F3)
|| (code >= 0x23F8 && code <= 0x23FA)
|| code == 0x24C2
|| code == 0x25AA || code == 0x25AB
|| code == 0x25B6
|| code == 0x25C0
|| (code >= 0x25FB && code <= 0x25FE)
|| (code >= 0x2600 && code <= 0x2604)
|| code == 0x260E
|| code == 0x2611
|| code == 0x2614 || code == 0x2615
|| code == 0x2618
|| code == 0x261D
|| code == 0x2620
|| code == 0x2622 || code == 0x2623
|| code == 0x2626
|| code == 0x262A
|| code == 0x262E || code == 0x262F
|| (code >= 0x2638 && code <= 0x263A)
|| (code >= 0x2648 && code <= 0x2653)
|| code == 0x2660
|| code == 0x2663
|| code == 0x2665 || code == 0x2666 接下面。。。
+ (BOOL)stringContainsEmoji:(NSString *)string
{
NSUInteger len = [string lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
if (len < 3) { // 大于2个字符需要验证Emoji(有些Emoji仅三个字符)
return NO;
}
// 仅考虑字节长度为3的字符,大于此范围的全部做Emoji处理
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
Byte *bts = (Byte *)[data bytes];
Byte bt;
short v;
for (NSUInteger i = 0; i < len; i++) {
bt = bts[i];
if ((bt | 0x7F) == 0x7F) { // 0xxxxxxx ASIIC编码
continue;
}
if ((bt | 0x1F) == 0xDF) { // 110xxxxx 两个字节的字符
i += 1;
continue;
}
if ((bt | 0x0F) == 0xEF) { // 1110xxxx 三个字节的字符(重点过滤项目)
// 计算Unicode下标
v = bt & 0x0F;
v = v << 6;
v |= bts[i + 1] & 0x3F;
v = v << 6;
v |= bts[i + 2] & 0x3F;
// NSLog(@"%02X%02X", (Byte)(v >> 8), (Byte)(v & 0xFF));
if ([NSString emojiInSoftBankUnicode:v] || [NSString emojiInUnicode:v]) {
return YES;
}
i += 2;
continue;
}
if ((bt | 0x3F) == 0xBF) { // 10xxxxxx 10开头,为数据字节,直接过滤
continue;
}
return YES; // 不是以上情况的字符全部超过三个字节,做Emoji处理
}
return NO;
}
+ (BOOL)emojiInSoftBankUnicode:(short)code
{
return ((code >> 8) >= 0xE0 && (code >> 8) <= 0xE5 && (Byte)(code & 0xFF) < 0x60);
}