iOS UITextField限制输入长度,处理中文输入法下的缺陷
-(void)textFiledEditChanged:(NSNotification *)obj{
UITextField *textField = (UITextField *)obj.object;
CGFloat kMaxLength = 30;
NSString *toBeString = textField.text;
if (textField.text.length > 0) {
self.clearBtn.hidden = NO;
}
else {
self.clearBtn.hidden = YES;
}
NSString *lang = [textField.textInputMode primaryLanguage]; // 键盘输入模式
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 = [textField markedTextRange];
//获取高亮部分
UITextPosition *position = [textField 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) {
if (toBeString.length > kMaxLength) {
textField.text = [toBeString substringToIndex:kMaxLength];
}
}
// 有高亮选择的字符串,则暂不对文字进行统计和限制
else{
}
}
// 中文输入法以外的直接对其统计限制即可,不考虑其他语种情况
else{
if (toBeString.length > kMaxLength) {
textField.text = [toBeString substringToIndex:kMaxLength];
}
}
[self.delegate searchBarText:self.searchTextField.text];
}