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; }
