Question

可能重复：
iPhone SDK: Set Max Character length TextField

我有5个UITextFields，其中只允许6个字符。如何将输入限制为每个文本字段仅6个字符？我试过的任何其他代码都失败了，我没有找到修复它的方法，谢谢：D 编辑：这是我测试的代码：

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSUInteger newLength1 = [serie1.text length] + [string length] - range.length;
    NSUInteger newLength2 = [serie2.text length] + [string length] - range.length;
    NSUInteger newLength3 = [serie3.text length] + [string length] - range.length;
    NSUInteger newLength4 = [serie4.text length] + [string length] - range.length;
    NSUInteger newLength5 = [serie5.text length] + [string length] - range.length;

    if(newLength1 > 6)
        return NO;
    if(newLength2 > 6)
        return NO; 
    if(newLength3 > 6)
        return NO; 
    if(newLength4 > 6)
        return NO; 
    if(newLength5 > 6)
        return NO;

    return YES;
}

和

-(BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if(serie1.text.length >= 6 && range.length == 0) {
        return NO;

    }
    if(serie2.text.length >= 6 && range.length == 0) {
        return NO;

    }
    if(serie3.text.length >= 6 && range.length == 0) {
        return NO;

    }
    if(serie4.text.length >= 6 && range.length == 0) {
        return NO;

    }
    if(serie5.text.length >= 6 && range.length == 0) {
        return NO;

    }
    return YES;
}

两者都有这样的问题：当你写6个字符时，你不能再写任何其他文本字段，直到你删除你写的字符

Answer 1

-(BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
   if(textField.text.length >= 7 && range.length == 0)  
   {
      return NO;
   }
   return YES;
}

Answer 2

实施UITextField委托方法：

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSUInteger newLength = [textField.text length] + [string length] - range.length;

    if(newLength > 6)
        return NO;

    return YES;
}

如何限制5个UITextField中的字符数

2 个答案: