1.首先先遵循UITextField 的代理方法
UITextFieldDelegate
2、#pragma mark ------>> 使用键盘的代理方法对输入进行控制 监听的效果 <<------
// 这里返回 NO 就是不让键盘输入
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if ([[[textField textInputMode] primaryLanguage] isEqualToString:@"emoji"] || ![[textField textInputMode] primaryLanguage]) {
return NO;//此处是限制emoji表情输入
}
NSString *tem = [[string componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] componentsJoinedByString:@""];//此处是限制空格输入
if (![string isEqualToString:tem]) {
return NO;
}else{
return YES;
}
return YES;
}