iphone - 当两个文本字段是一些文本时如何显示警报

Question

我有两个 UITextField。我想检查 UITextField，如果两个 UITextField 是一些文本显示警报，或者如果只有一个 UITextField 有一些文本，那么继续。

Answer 1

你可以使用 UITextFieldDelegate 的两个委托函数

-(BOOL) textFieldShouldReturn:(UITextField *)textField
{
  [textField resignFirstResponder];
   return YES;
}

-(void)textFieldDidEndEditing:(UITextField *)textField
{
if ([self.textField1.text isEqualToString:self.textField2.text])
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert"
                                                    message:@"text field have same text"
                                                   delegate:nil
                                          cancelButtonTitle:@"Cancel"
                                          otherButtonTitles:nil];

    [alert show];
}
}

Answer 2

if([txt1.text length] > 0 && [txt2.text length]>0)
    {   
        UIAlertView * alert=[[UIAlertView alloc]initWithTitle:@"Alert" message:@"TextFied Have an Text" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil, nil];

        [alert show];   
    }
else
   {
        //Go Forword
   }

试试这个代码

Answer 3

像这样实现UITextField的委托方法......

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    if ([textField1.text length] > 0 && [textField2.text length] > 0)
    {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"" message:@"Hello" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
    }
   else 
   {
                // go forward here.....
   }
}

Answer 4

如果两个 textField 具有相同的文本，则显示警报，例如确认密码。

if ([firstTextField.text isEqualToString:secodTextField.text])
    {
        //Show Alert
        return;
    }

Answer 5

这是满足您要求的完整代码。

// check if any text field has some text.
if ([txt1.text length] > 0 && [txt1.text length] > 0 )
{
   // show alert 
   UIAlertView * alert=[[UIAlertView alloc]initWithTitle:@"Alert" message:@"TextFied Have an Text" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil, nil];

    [alert show]; 
}
// check if any one text field has some text
else if(([txt1.text length] > 0 && [txt2.text isEqualToString:@"") || ([txt2.text length] > 0 && [txt1.text isEqualToString:@"") )
{   
   // go forward  
}

而已。

Answer 6

如果您想省略文本字段中的空格，可以使用以下代码

if([[self.testfield1.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] length] > 0 && [[self.testfield2.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] length]>0)
    {
        UIAlertView * alert=[[UIAlertView alloc]initWithTitle:@"Alert" message:@"TextFields Have an Text" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil, nil];

        [alert show];
    }
    else
    {
        UIAlertView * alert=[[UIAlertView alloc]initWithTitle:@"Alert" message:@"TextField not having an Text" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil, nil];
        [alert show];

    }