一、實現(xiàn)的邏輯很簡單且代碼量不多，直接貼出源碼供方便快速使用。
@property?(nonatomic,?strong)?UITextView?*textView;
@property?(nonatomic,?strong)?UILabel?*limitLabel;
_textView?=?[[UITextView?alloc]?initWithFrame:CGRectMake(5,5,?MAIN_WIDTH-10,130.3)];
_textView.placeHolder?=?@"請描述您的問題...";
_textView.returnKeyType?=?UIReturnKeyDone;
_textView.delegate?=?self;
_textView.textColor?=?UIColorFromRGB(0xBEBDBD);
_textView.font?=?[UIFont?systemFontOfSize:15];
[self?addSubview:_textView];
_limitLabel?=?[[UILabel?alloc]?initWithFrame:CGRectMake(MAIN_WIDTH/4*3,130.3,?MAIN_WIDTH/4-10,20)];
_limitLabel.text?=?@"0/500";
_limitLabel.font?=?[UIFont?systemFontOfSize:12];
_limitLabel.textAlignment?=?NSTextAlignmentRight;
_limitLabel.textColor?=?UIColorFromRGB(0x999999);
_limitLabel.backgroundColor?=?[UIColor?clearColor];
二、實現(xiàn)TextView代理方法
實時監(jiān)聽TextView輸入框的return鍵，當點擊return鍵時結束編輯的實現(xiàn)思路：判斷輸入的字是否為\n回車，即按下return鍵
-?(void)textViewDidChange:(UITextView?*)textView?{
_limitLabel.text?=?[NSString?stringWithFormat:@"%ld/500",textView.text.length?];
}
-?(BOOL)textView:(UITextView?*)textView?shouldChangeTextInRange:(NSRange)range?replacementText:(NSString?*)text{
NSLog(@"textLength?==?%ld",textView.text.length);
if([text?isEqualToString:@"\n"]){//判斷輸入的字是否是回車，即按下return
[self.textView?resignFirstResponder];
returnNO;
}
if([self?stringContainsEmoji:text]?==?YES)?{
[PubllicMaskViewHelper?showTipViewWith:@"不支持輸入Emoji表情符號"inSuperView:self?withDuration:1];
returnNO;
}
if(textView.text.length?+?text.length?>500)?{
NSString?*allText?=?[NSString?stringWithFormat:@"%@%@",textView.text,text];
textView.text?=?[allText?substringToIndex:500];
[PubllicMaskViewHelper?showTipViewWith:@"輸入不能超過500個字"inSuperView:self?withDuration:1];
returnNO;
}
returnYES;
}
三、過濾所有Emoji表情符號
//?過濾所有表情
-?(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)?{
constunichar?hs?=?[substring?characterAtIndex:0];
//?surrogate?pair
if(0xd800<=?hs?&&?hs1)?{
constunichar?ls?=?[substring?characterAtIndex:1];
constintuc?=?((hs?-0xd800)?*0x400)?+?(ls?-0xdc00)?+0x10000;
if(0x1d000<=?uc?&&?uc1)?{
constunichar?ls?=?[substring?characterAtIndex:1];
if(ls?==0x20e3)?{
returnValue?=?YES;
}
}else{
//?non?surrogate
if(0x2100<=?hs?&&?hs?<=0x27ff)?{
returnValue?=?YES;
}elseif(0x2B05<=?hs?&&?hs?<=0x2b07)?{
returnValue?=?YES;
}elseif(0x2934<=?hs?&&?hs?<=0x2935)?{
returnValue?=?YES;
}elseif(0x3297<=?hs?&&?hs?<=0x3299)?{
returnValue?=?YES;
}elseif(hs?==0xa9||?hs?==0xae||?hs?==0x303d||?hs?==0x3030||?hs?==0x2b55||?hs?==0x2b1c||?hs?==0x2b1b||?hs?==0x2b50)?{
returnValue?=?YES;
}
}
}];
returnreturnValue;
}
