UITextField 输入空格和删除键的处理

说明

​ 有时候为了控制输入，需要在delegate中实现控制。上代码

代码

#pragma mark - textfield delegate

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    //删除
    if ([string isEqualToString:@""]) {
        if (textField.text.length == 1) {
						//TODO:handle your stuff
						return YES;
        }
    }
    //空格
    if ([string isEqualToString:@" "]) {
        textField.text = [textField.text trim];
        return NO;
    }
   //TODO:handle your stuff
    return YES;
}