iphone - 如何设置文本字段的条件。文本？

Question

if([txtField1.text  intValue] == nil  && [txtField2.text  intValue] == nil && [txtField3.text  intValue] == nil  && [txtField4.text  intValue] == nil  && [txtField5.text  intValue] == nil && [txtField6.text  intValue] == nil && [txtField7.text  intValue] == nil && [txtField8.text  intValue] == nil )
{
    UIAlertView *info = [[UIAlertView alloc] initWithTitle:@"Info" message: @"Please complete your test." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
     [info show];
     [info release];

}
else if(txtField1.text == NULL  || txtField2.text   == NULL || txtField3.text  == NULL || txtField4.text   == NULL  || txtField5.text  == NULL || txtField6.text == NULL ||txtField7.text == NULL || txtField8.text  == NULL )
{
    UIAlertView *info = [[UIAlertView alloc] initWithTitle:@"Info" message: @"Please complete your test." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [info show];
    [info release];

}
else{
fourthScreen=[[FourthScreen alloc] initWithNibName:@"FourthScreen" bundle:nil];
    [self.navigationController pushViewController:self.fourthScreen animated:YES];
}

在上面的代码中我有 8 个文本字段。为此，我定义了一个条件，即当所有文本字段均为空白或 nil 时，显示警报 View 消息。它正在发挥作用。但是，当我定义为当任何一个文本字段为零或空白时，也会显示警报 View ，但不会显示。问题是，当我输入整数值“0”时，它也会显示警报 View ，但我希望它不显示“0”值。 picke4r View 选择的值。如何设置代码？

Answer 1

尝试:

if([txtName.text length] == 0 || [txtName.text isEqualToString:@""])
{
         // Alert here
}

测试长度为 0 或将字符串与空白字符串进行比较。