參考文獻(xiàn):http://www.reibang.com/p/ea6b8c026f6b
#import "ViewController.h"
#define kMaxLength 20
@interface ViewController ()<UITextFieldDelegate>
@property (weak, nonatomic) IBOutlet UITextField *demoTextField;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self.demoTextField addTarget:self action:@selector(textFieldChanged:) forControlEvents:UIControlEventEditingChanged];
self.demoTextField.delegate = self;
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSLog(@"------------shouldChangeCharactersInRange:%@-----------",string);
if ([self isInputRuleNotBlank:string] || [string isEqualToString:@""]) {//當(dāng)輸入符合規(guī)則和退格鍵時(shí)允許改變輸入框
return YES;
} else {
return NO;
}
}
- (void)textFieldChanged:(UITextField *)textField {
NSLog(@"----------textFieldChanged:%@-------------",textField.text);
NSString *toBeString = textField.text;
if (![self isInputRuleAndBlank:toBeString]) {
textField.text = [self disable_emoji:toBeString];
return;
}
NSString *lang = [[textField textInputMode] primaryLanguage]; // 獲取當(dāng)前鍵盤(pán)輸入模式
NSLog(@"%@",lang);
if([lang isEqualToString:@"zh-Hans"])
{ //簡(jiǎn)體中文輸入,第三方輸入法(搜狗)所有模式下都會(huì)顯示“zh-Hans”
UITextRange *selectedRange = [textField markedTextRange];
//獲取高亮部分
UITextPosition *position = [textField positionFromPosition:selectedRange.start offset:0];
//沒(méi)有高亮選擇的字,則對(duì)已輸入的文字進(jìn)行字?jǐn)?shù)統(tǒng)計(jì)和限制
if(!position) {
NSString *getStr = [self getSubString:toBeString];
if(getStr && getStr.length > 0) {
textField.text = getStr;
}
}
}
else
{
NSString *getStr = [self getSubString:toBeString];
if(getStr && getStr.length > 0) {
textField.text= getStr;
}
}
}
/**
* 字母、數(shù)字、中文正則判斷(不包括空格)
*/
- (BOOL)isInputRuleNotBlank:(NSString *)str {
//NSString *pattern = @"^[a-zA-Z\u4E00-\u9FA5\\d]*$";
NSString *pattern = @"^[????????a-zA-Z\u4E00-\u9FA5\\d]*$";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
BOOL isMatch = [pred evaluateWithObject:str];
return isMatch;
}
/**
* 字母搀愧、數(shù)字该镣、中文正則判斷(包括空格)(在系統(tǒng)輸入法中文輸入時(shí)會(huì)出現(xiàn)拼音之間有空格荆姆,需要忽略攻询,當(dāng)按return鍵時(shí)會(huì)自動(dòng)用字母替換恶复,按空格輸入響應(yīng)漢字)
*/
- (BOOL)isInputRuleAndBlank:(NSString *)str {
//NSString *pattern = @"^[a-zA-Z\u4E00-\u9FA5\\d\\s]*$";
NSString *pattern = @"^[????????a-zA-Z\u4E00-\u9FA5\\d\\s]*$";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
BOOL isMatch = [pred evaluateWithObject:str];
return isMatch;
}
/**
* 獲得 kMaxLength長(zhǎng)度的字符
*/
-(NSString *)getSubString:(NSString*)string
{
NSStringEncoding encoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
NSData* data = [string dataUsingEncoding:encoding];
NSInteger length = [data length];
if (length > kMaxLength) {
NSData *data1 = [data subdataWithRange:NSMakeRange(0, kMaxLength)];
NSString *content = [[NSString alloc] initWithData:data1 encoding:encoding];//注意:當(dāng)截取kMaxLength長(zhǎng)度字符時(shí)把中文字符截?cái)喾祷氐腸ontent會(huì)是nil
if (!content || content.length == 0) {
data1 = [data subdataWithRange:NSMakeRange(0, kMaxLength - 1)];
content = [[NSString alloc] initWithData:data1 encoding:encoding];
}
return content;
}
return nil;
}
- (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;
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
[self.view endEditing:YES];
}