iOS遇到输入框输入时，蓝色的拼音文字也是属于textField的内容，一般的textField.text的length时会算进去，所以这里不太好判断，要是如果遇到了强迫症的产品经理一定要你在输入文字达到最大长度时，连拼音都不能输入，那就麻烦了。
不过别慌，这里有教程，保证你能满足需求，本文是在三方基础上改的 <RestrictionInput>, 末尾回复上该源码，可直接食用，如果对你有帮助点个赞或者收藏下
#import "GroupNameViewCtrl.h"
#import "RestrictionInput.h"
@interface GroupNameViewCtrl () <UITextFieldDelegate>
{
NSInteger MAX_INPUT_LENGTH; // 中文字数限制字数，转化成英文两倍
}
@property (nonatomic, strong) UIView *textBaseview;
@property (nonatomic, strong) UITextField *txtField;
@property (nonatomic, copy) NSString *currentText;
@property (nonatomic, assign) BOOL isStop; // 字数达到最大时否停止输入
@end
@implementation GroupNameViewCtrl
- (void)viewDidLoad {
[super viewDidLoad];
_isStop = NO;
MAX_INPUT_LENGTH = 20;
[self setNavi];
[self setUI];
if (!_isMaster) {
self.rightBtn.hidden = YES;
self.txtField.userInteractionEnabled = NO;
}
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldChange:) name:UITextFieldTextDidChangeNotification object:nil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)setNavi {
[self.rightBtn setTitle:GET_LANGUAGE_KEY(@"OK") forState:UIControlStateNormal];
[self.rightBtn setImage:nil forState:UIControlStateNormal];
self.rightBtn.titleLabel.font = FONT_F3;
self.rightBtn.titleLabel.adjustsFontSizeToFitWidth = YES;
}
- (void)setUI {
[self.view addSubview:self.textBaseview];
[self.textBaseview addSubview:self.txtField];
UIButton *btnDelete = [[UIButton alloc] init];
[btnDelete setImage:[UIImage imageNamed:@"clear"] forState:UIControlStateNormal];
[btnDelete addTarget:self action:@selector(btnDeleteAction:) forControlEvents:UIControlEventTouchUpInside];
[self.textBaseview addSubview:btnDelete];
[self.textBaseview mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(self.naviView.mas_bottom).offset(12);
make.left.right.equalTo(self.view);
make.height.equalTo(49);
}];
[self.txtField mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerY.equalTo(self.textBaseview);
make.left.equalTo(self.textBaseview).offset(15);
make.right.equalTo(self.textBaseview).offset(-40);
}];
[btnDelete mas_makeConstraints:^(MASConstraintMaker *make) {
make.right.equalTo(self.textBaseview).offset(16);
make.centerY.equalTo(self.textBaseview);
}];
}
/*********** 正 文 开 始 ***********/
#pragma mark - notification
- (void)textFieldChange:(NSNotification *)noti {
UITextField *txtView = (UITextField *)noti.object;
//判断输入(不能输入特殊字符)
[RestrictionInput restrictionInputTextField:txtView maxNumber:MAX_INPUT_LENGTH*2+1 showErrorMessage:nil];
NSString *toBeString = txtView.text;
NSString *lang = [[txtView textInputMode] primaryLanguage];
if([lang isEqualToString:@"zh-Hans"]) { //简体中文输入，包括简体拼音，健体五笔，简体手写
UITextRange *selectedRange = [txtView markedTextRange];
UITextPosition *position = [txtView positionFromPosition:selectedRange.start offset:0];
if (!position){//非高亮
NSInteger length = [Utils getToLength:toBeString];
if ((MAX_INPUT_LENGTH-length/2) > 0) {
_isStop = NO;
} else {
_isStop = YES;
}
}
}else{//中文输入法以外
NSInteger length = [Utils getToLength:toBeString];
if ((MAX_INPUT_LENGTH-length/2) > 0) {
_isStop = NO;
} else {
_isStop = YES;
}
}
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if ([string isEqualToString:@""]) {
return YES;
}
if ([string isEqualToString:@"\n"]) {
[textField resignFirstResponder];
return NO;
}
if (_isStop) {
return NO;
}
return YES;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[_txtField resignFirstResponder];
return YES;
}
/*********** 正 文 结 束 ***********/
#pragma mark - event
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
[_txtField resignFirstResponder];
}
- (void)clickLeftButton:(UIButton *)sender {
[_txtField resignFirstResponder];
_currentText = [self.txtField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
if ([_currentText isEqualToString:_model.title]) {
[self.navigationController popViewControllerAnimated:YES];
return;
}
UIAlertController *alert = [UIAlertController alertControllerWithTitle:GET_LANGUAGE_KEY(@"giveupModify") message:nil preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *cancel = [UIAlertAction actionWithTitle:GET_LANGUAGE_KEY(@"cancel") style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
}];
UIAlertAction *ok = [UIAlertAction actionWithTitle:GET_LANGUAGE_KEY(@"OK") style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[self.navigationController popViewControllerAnimated:YES];
}];
[alert addAction:cancel];
[alert addAction:ok];
[self presentViewController:alert animated:YES completion:nil];
}
- (void)clickRightButton:(UIButton *)sender {
[_txtField resignFirstResponder];
// 去掉首位空格
_currentText = [self.txtField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
// 保存网络请求吧啦吧啦吧啦
}
- (void)btnDeleteAction:(UIButton *)sender {
_txtField.text = nil;
}
#pragma mark - setter and getter
- (UIView *)textBaseview {
if (!_textBaseview) {
_textBaseview = [[UIView alloc] init];
_textBaseview.backgroundColor = COLOR_B7;
}
return _textBaseview;
}
- (UITextField *)txtField {
if (!_txtField) {
_txtField = [[UITextField alloc] init];
_txtField.textColor = COLOR_B1;
_txtField.font = FONT_F4;
_txtField.returnKeyType = UIReturnKeyDone;
_txtField.delegate = self;
_txtField.text = _model.title;
_txtField.placeholder = GET_LANGUAGE_KEY(@"inputGroupName");
// 防止初始化的时候就达到最大值还能输的情况
NSInteger length = [Utils getToLength:_txtField.text];
if ((MAX_INPUT_LENGTH-length/2) > 0) {
_isStop = NO;
} else {
_isStop = YES;
}
}
return _txtField;
}
@end
// RestrictionInput.h
#import <Foundation/Foundation.h>
@interface RestrictionInput : NSObject
+ (void)restrictionInputTextField:(UITextField *)inputClass maxNumber:(NSInteger)maxNumber showErrorMessage:(NSString *)errorMessage;
+ (void)restrictionInputTextView:(UITextView *)inputClass maxNumber:(NSInteger)maxNumber showErrorMessage:(NSString *)errorMessage checkChar:(BOOL)checkChar;
+ (BOOL)isInputRuleAndBlank:(NSString *)str regular:(NSString *)regular;
@end
// RestrictionInput.m
#import "RestrictionInput.h"
@implementation RestrictionInput
+ (void)restrictionInputTextField:(UITextField *)inputClass maxNumber:(NSInteger)maxNumber showErrorMessage:(NSString *)errorMessage
{
NSString *toBeString = inputClass.text;
if (![self isInputRuleAndBlank:toBeString regular:REGULAR_EXPRESSION]) {
inputClass.text = [self disable_emoji:toBeString];
return;
}
NSString *lang = [[inputClass textInputMode] primaryLanguage]; // 获取当前键盘输入模式
if([lang isEqualToString:@"zh-Hans"]) { //简体中文输入,第三方输入法（搜狗）所有模式下都会显示“zh-Hans”
UITextRange *selectedRange = [inputClass markedTextRange];
//获取高亮部分
UITextPosition *position = [inputClass positionFromPosition:selectedRange.start offset:0];
//没有高亮选择的字，则对已输入的文字进行字数统计和限制
if(!position) {
NSString *getStr = [self getSubString:toBeString maxNumber:maxNumber];
if(getStr && getStr.length > 0) {
inputClass.text = getStr;
[Utils showToastMessage:errorMessage];
}
}
} else{
NSString *getStr = [self getSubString:toBeString maxNumber:maxNumber];
if(getStr && getStr.length > 0) {
inputClass.text= getStr;
}
}
}
+ (void)restrictionInputTextView:(UITextView *)inputClass maxNumber:(NSInteger)maxNumber showErrorMessage:(NSString *)errorMessage checkChar:(BOOL)checkChar
{
NSString *toBeString = inputClass.text;
if (checkChar) {
if (![self isInputRuleAndBlank:toBeString regular:REGULAR_EXPRESSION]) {
inputClass.text = [self disable_emoji:toBeString];
return;
}
}
NSString *lang = [[inputClass textInputMode] primaryLanguage]; // 获取当前键盘输入模式
if([lang isEqualToString:@"zh-Hans"]) { //简体中文输入,第三方输入法（搜狗）所有模式下都会显示“zh-Hans”
UITextRange *selectedRange = [inputClass markedTextRange];
//获取高亮部分
UITextPosition *position = [inputClass positionFromPosition:selectedRange.start offset:0];
//没有高亮选择的字，则对已输入的文字进行字数统计和限制
if(!position) {
NSString *getStr = [self getSubString:toBeString maxNumber:maxNumber];
if(getStr && getStr.length > 0) {
inputClass.text = getStr;
[Utils showToastMessage:errorMessage];
}
}
} else{
NSString *getStr = [self getSubString:toBeString maxNumber:maxNumber];
if(getStr && getStr.length > 0) {
inputClass.text= getStr;
[Utils showToastMessage:errorMessage];
}
}
}
/**
* 获得 kMaxLength长度的字符
*/
+ (NSString *)getSubString:(NSString*)string maxNumber:(NSInteger)maxNumber
{
NSStringEncoding encoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
NSData* data = [string dataUsingEncoding:encoding];
NSInteger length = [data length];
if (length > maxNumber) {
NSData *data1 = [data subdataWithRange:NSMakeRange(0, maxNumber)];
NSString *content = [[NSString alloc] initWithData:data1 encoding:encoding];//【注意4】：当截取kMaxLength长度字符时把中文字符截断返回的content会是nil
if (!content || content.length == 0) {
data1 = [data subdataWithRange:NSMakeRange(0, maxNumber - 1)];
content = [[NSString alloc] initWithData:data1 encoding:encoding];
}
return content;
}
return nil;
}
/**
* 字母、数字、中文正则判断（不包括空格）
*/
+ (BOOL)isInputRuleNotBlank:(NSString *)str {
NSString *pattern = @"^[➋➌➍➎➏➐➑➒\a-zA-Z\u4E00-\u9FA5\\d]*$";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
BOOL isMatch = [pred evaluateWithObject:str];
return isMatch;
}
/**
* 字母、数字、中文正则判断（包括空格）【注意3】
*/
+ (BOOL)isInputRuleAndBlank:(NSString *)str regular:(NSString *)regular {
//九宫格无法输入解决需要加上正则 \➋➌➍➎➏➐➑➒
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regular];
BOOL isMatch = [pred evaluateWithObject:str];
return isMatch;
}
+ (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:text
options:0
range:NSMakeRange(0, [text length])
withTemplate:@""];
return modifiedString;
}
@end
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