首先在建立textfield的时候要给当前的视图添加一个通知
[[NSNotificationCenter defaultCenter] mdf_safeAddObserver:self selector:@selector(textFieldDidChange) name:UITextFieldTextDidChangeNotification object:nil];
其次就是写这个方法了
- (void)textFieldDidChange
{
UITextRange *selectedRange = [self.contentTextField markedTextRange];
//获取高亮部分
UITextPosition *pos = [self.contentTextField positionFromPosition:selectedRange.start offset:0];
//如果在变化中是高亮部分在变，就不判断了
if (selectedRange && pos) {
return;
}
NSString *replaceStr = [self.contentTextField.text mdf_safeSubstringFromIndex:self.tempStr.length];
if (self.inputType == QTKEnterPriseBaseInfoInputTypeChineseCharacter) {
if (replaceStr.length) {
// 只能输入中文
NSString *regex = @"[\\u4e00-\\u9fa5]+$";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
if (![pred evaluateWithObject:replaceStr]) {
[SVProgressHUD showInfoWithStatus:@"只能输入汉字"];
self.contentTextField.text = self.tempStr;
return;
}
}
}
if (self.contentTextField.text.length > self.inputLength && self.inputLength) {
self.contentTextField.text = [self.contentTextField.text mdf_safeSubstringToIndex:self.inputLength];
[SVProgressHUD showInfoWithStatus:[NSString stringWithFormat:@"只能输入%@个字", @(self.inputLength)]];
}
self.tempStr = self.contentTextField.text;
}
