iOS - 监控键盘高度、屏蔽字符、限制字符个数

iOS开发中，经常会用到UITextView,UITextField输入文本操作，默认的键盘输入会有emoji表情、空格、非法字符等,会与实际的产品需求不符，这时候就需要我们做限制，禁止输入表情或者空格，甚至标点符号，限制输入的字符个数，小数点之后保留几位，键盘防遮挡（监控键盘高度）等等不同的需求。针对这些需求，博主整理了一下，主要有以下三个方面。

1.屏蔽emoji表情，屏蔽空格

首先说的是屏蔽emoji表情，屏蔽空格，这里主要针对第三方键盘（例如搜狗输入法）和系统键盘的处理。（UITextFieldDelegate和NSNotificationCenter要同时使用）

1）iOS系统键盘使用UITextField的代理即可监控。

#pragma mark - UITextField代理
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{UITextInputMode *inputMode = [UITextInputMode currentInputMode];//会有警告（7.0），可参考替换 UITextInputMode *inputMode = textField.textInputModeNSString *indentifier = [inputMode performSelector:NSSelectorFromString(@"identifier")];//会有警告（leak）,可被忽略。if ([indentifier isEqualToString:@"com.sogou.sogouinput.basekeyboard"]) {//搜狗键盘//过滤emoji表情BOOL isEmoj = [self stringContainsEmoji:string];if (isEmoj) {string = [self disable_emoji:string];}else{//非emoji}//过滤空格NSString *lTmp = [NSString stringWithFormat:@"%s"," "];string = [string stringByReplacingOccurrencesOfString:lTmp withString:@""];}else{if ([indentifier isEqualToString:@"zh_Hans-Pinyin@sw=Pinyin10-Simplified;hw=US"]) {//简体拼音（九宫格）//过滤emoji表情BOOL isEmoj = [self stringContainsEmoji:string];if (isEmoj) {string = [self disable_emoji:string];}else{//非emoji}//过滤空格if ([string isEqualToString:@" "]) {return NO;}}if ([indentifier isEqualToString:@"zh_Hans-Pinyin@sw=Pinyin-Simplified;hw=US"]) {//简体拼音（全键盘）//过滤emoji表情BOOL isEmoj = [self stringContainsEmoji:string];if (isEmoj) {string = [self disable_emoji:string];}else{//非emoji}//过滤空格if ([string isEqualToString:@" "]) {return NO;}}if ([indentifier isEqualToString:@"emoji@sw=Emoji"]) {//表情符号return NO;}if ([indentifier isEqualToString:@"en_US@hw=US;sw=QWERTY"]) {//English(US)}  //其他键盘同理可自行判断（三方自定义键盘样式、输入模式不确定）}return YES;}

2）针对搜狗输入法，联想文字不受控制，UITextField的代理方法就会监控失效，那么此时我们就不能使用代理了。

#pragma mark - 添加监控
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(textFiledEditChanged:)name:@"UITextFieldTextDidChangeNotification"object:textField];//按照自己的需求添加监控对象。

#pragma mark - 监控处理
-(void)textFiledEditChanged:(NSNotification*)obj{//textFiledUITextField *textField = (UITextField *)obj.object;NSString *toBeString = textField.text;UITextInputMode *inputMode = [UITextInputMode currentInputMode];//键盘类型NSString *indentifier = [inputMode performSelector:NSSelectorFromString(@"identifier")];if ([indentifier isEqualToString:@"com.sogou.sogouinput.basekeyboard"]) {//搜狗键盘//过滤emoji表情BOOL isEmoj = [self stringContainsEmoji:toBeString];if (isEmoj) {toBeString = [self disable_emoji:toBeString];}else{//非emoji}//过滤空格NSString *lTmp = [NSString stringWithFormat:@"%s"," "];toBeString = [toBeString stringByReplacingOccurrencesOfString:lTmp withString:@""];textField.text = toBeString;}else{if ([indentifier isEqualToString:@"zh_Hans-Pinyin@sw=Pinyin10-Simplified;hw=US"]) {//简体拼音（九宫格）}if ([indentifier isEqualToString:@"zh_Hans-Pinyin@sw=Pinyin-Simplified;hw=US"]) {//简体拼音（全键盘）}if ([indentifier isEqualToString:@"emoji@sw=Emoji"]) {//表情符号//过滤emoji表情BOOL isEmoj = [self stringContainsEmoji:toBeString];if (isEmoj) {toBeString = [self disable_emoji:toBeString];}else{//非emoji}//过滤空格NSString *lTmp = [NSString stringWithFormat:@"%s"," "];toBeString = [toBeString stringByReplacingOccurrencesOfString:lTmp withString:@""];textField.text = toBeString;}if ([indentifier isEqualToString:@"en_US@hw=US;sw=QWERTY"]) {//English(US)//过滤emoji表情BOOL isEmoj = [self stringContainsEmoji:toBeString];if (isEmoj) {toBeString = [self disable_emoji:toBeString];}else{//非emoji}//过滤空格NSString *lTmp = [NSString stringWithFormat:@"%s"," "];toBeString = [toBeString stringByReplacingOccurrencesOfString:lTmp withString:@""];textField.text = toBeString;}}//其他键盘同理可自行判断（三方自定义键盘样式、输入模式不确定）
}

补充说明一下如何屏蔽标点符号

#pragma mark - 屏蔽标点符号（这个算是额外补充，可视情况添加在需要的地方）NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@"@／：；（）¥「」＂、[]{}#%-*+=_\\|~＜＞$€^•'@#$%^&*()_+'\""];toBeString = [toBeString stringByTrimmingCharactersInSet:set];//toBeString为你想要处理的字符串

3) 判断字符串中年是否含有emoji

#pragma mark - 判断NSString字符串是否包含emoji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) {const unichar hs = [substring characterAtIndex:0];// surrogate pairif (0xd800) {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 {// non surrogateif (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;
}

4) 过滤表情

#pragma mark - 过滤表情
- (NSString *)disable_emoji:(NSString *)text
{NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]" options:NSRegularExpressionCaseInsensitive error:nil];NSString *modifiedString = [regex stringByReplacingMatchesInString:textoptions:0range:NSMakeRange(0, [text length])withTemplate:@""];return modifiedString;
}

2.限制键盘输入的字符个数（小数点后保留n位）

#pragma mark - 宏定义#define myDotNumbers     @"0123456789.\n"
#define myNumbers          @"0123456789\n"

#pragma mark - UITextField代理- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{if ([string isEqualToString:@"\n"]||[string isEqualToString:@""]) {//按下returnreturn YES;}NSCharacterSet *cs;NSUInteger nDotLoc = [textField.text rangeOfString:@"."].location;if (NSNotFound == nDotLoc && 0 != range.location) {cs = [[NSCharacterSet characterSetWithCharactersInString:myNumbers]invertedSet];if ([string isEqualToString:@"."]) {return YES;}if (textField.text.length>=20) {  //小数点前面20位return NO;}}else {cs = [[NSCharacterSet characterSetWithCharactersInString:myDotNumbers]invertedSet];if (textField.text.length>=23) {//整个最长23位return  NO;}}NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];BOOL basicTest = [string isEqualToString:filtered];if (!basicTest) {return NO;}if (NSNotFound != nDotLoc && range.location > nDotLoc +2) {//小数点后面两位return NO;}return YES;
}
//具体是如何计算的呢？小数点一位，小数点之后两位，小数点之前最长20，整个最长1+2+20=23.

3.监控键盘高度

第三方：IQKeyboard同样的原理，可以参考一下。获取高度，位移单个控件或者view。

[[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardWillShow:)name:UIKeyboardWillShowNotificationobject:nil];

例如iPhone6以上的只使用上面的就可以，但是像iPhone5、iPhone5s这样的需要额外监控。以下是补充说明。

//-----------2016年10月25日更新---------------
#ifdef __IPHONE_5_0float version = [[[UIDevice currentDevice] systemVersion] floatValue];if (version >= 5.0) {[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow1:) name:UIKeyboardWillChangeFrameNotification object:nil];}
#endif

- (void)keyboardWillShow:(NSNotification *)notification
{CGRect keyboardRect = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];CGFloat keyboardHeight = keyboardRect.size.height;
}

IQKeyboard的keyboardWillShow:方法。

#pragma mark - UIKeyboad Notification methods
/*  UIKeyboardWillShowNotification. */
-(void)keyboardWillShow:(NSNotification*)aNotification
{_kbShowNotification = aNotification;if ([self privateIsEnabled] == NO)  return;_IQShowLog([NSString stringWithFormat:@"****** %@ started ******",NSStringFromSelector(_cmd)]);//Due to orientation callback we need to resave it's original frame.    //  (Bug ID: #46)//Added _isTextFieldViewFrameChanged check. Saving textFieldView current frame to use it with canAdjustTextView if textViewFrame has already not been changed. (Bug ID: #92)if (_isTextFieldViewFrameChanged == NO && _textFieldView){_textFieldViewIntialFrame = _textFieldView.frame;_IQShowLog([NSString stringWithFormat:@"Saving %@ Initial frame :%@",[_textFieldView _IQDescription],NSStringFromCGRect(_textFieldViewIntialFrame)]);}if (CGRectEqualToRect(_topViewBeginRect, CGRectZero))    //  (Bug ID: #5){//  keyboard is not showing(At the beginning only). We should save rootViewRect._rootViewController = [_textFieldView topMostController];if (_rootViewController == nil)  _rootViewController = [[self keyWindow] topMostController];_topViewBeginRect = _rootViewController.view.frame;_IQShowLog([NSString stringWithFormat:@"Saving %@ beginning Frame: %@",[_rootViewController _IQDescription] ,NSStringFromCGRect(_topViewBeginRect)]);}if (_shouldAdoptDefaultKeyboardAnimation){//  Getting keyboard animation._animationCurve = [[aNotification userInfo][UIKeyboardAnimationCurveUserInfoKey] integerValue];_animationCurve = _animationCurve<<16;}else{_animationCurve = UIViewAnimationOptionCurveEaseOut;}//  Getting keyboard animation durationCGFloat duration = [[aNotification userInfo][UIKeyboardAnimationDurationUserInfoKey] floatValue];//Saving animation durationif (duration != 0.0)    _animationDuration = duration;CGSize oldKBSize = _kbSize;//  Getting UIKeyboardSize.CGRect kbFrame = [[aNotification userInfo][UIKeyboardFrameEndUserInfoKey] CGRectValue];CGRect screenSize = [[UIScreen mainScreen] bounds];//Calculating actual keyboard displayed size, keyboard frame may be different when hardware keyboard is attached (Bug ID: #469) (Bug ID: #381)CGRect intersectRect = CGRectIntersection(kbFrame, screenSize);if (CGRectIsNull(intersectRect)){_kbSize = CGSizeMake(screenSize.size.width, 0);}else{_kbSize = intersectRect.size;}//If last restored keyboard size is different(any orientation accure), then refresh. otherwise not.if (!CGSizeEqualToSize(_kbSize, oldKBSize)){//If _textFieldView is inside UIAlertView then do nothing. (Bug ID: #37, #74, #76)//See notes:- https://developer.apple.com/Library/ios/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html. If it is UIAlertView textField then do not affect anything (Bug ID: #70).if (_textFieldView != nil  && [_textFieldView isAlertViewTextField] == NO){[self adjustFrame];}}_IQShowLog([NSString stringWithFormat:@"****** %@ ended ******",NSStringFromSelector(_cmd)]);
}

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iOS - 监控键盘高度、屏蔽字符、限制字符个数

1.屏蔽emoji表情，屏蔽空格

2.限制键盘输入的字符个数（小数点后保留n位）

3.监控键盘高度

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