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我有以下情况：我有 2 个文本字段，一个用于人名，另一个用于电子邮件输入。我现在要验证来自文本字段的输入，我使用“if 语句”来验证，如下所示：

NSString *name = [self.defaults objectForKey:@"Name"];
NSString *email = [self.defaults objectForKey:@"Email"];

 if ([name length] > 0 && NSStringIsValidName(name) && [email length] > 0 && NSStringIsValidEmail(email) ) {

        //All is okay, proceed to main menu. 



    } else {


        if (!NSStringIsValidName(name)) {
            alertMessage = @"Your name is not valid"

        }else if ([name length] == 0) {


            alertMessage = @"Name not written. Please write a name in settings";

            NSLog(@"3 name not written");

        }else if (!NSStringIsValidEmail(email)) {

            alertMessage = @"Your email is not valid";

            NSLog(@"4 email not valid");
        }else if ([email length] == 0) {

            alertMessage = @"Email not written. Please write a name in settings";

            NSLog(@"5 email not written ");

        }


            alertMessage = @"Name and email is not written or is not valid";

            NSLog(@"1 all not valid");

        //Show Alert message.... 
    }

如果只有姓名和电子邮件均未写入或无效，我现在想显示警报消息，然后仅在满足其条件时才显示其余的警报消息。使用我当前的代码，警报显示两次。例如，如果姓名和电子邮件都有效，我会为他们收到一条消息，并为他们各自的 if 语句收到两条消息。如果两个值都为真或假，如何only 执行一项操作，以便根据条件显示一个警报？

4

1 回答 1

1

让它成为你的第一个条件：

if (!NSStringIsValidName(name) && !NSStringIsValidEmail(email)) {
  alertMessage = @"Name and email is not written or is not valid";
  NSLog(@"1 all not valid");
} else if (!NSStringIsValidName(name)) {
  alertMessage = @"Your name is not valid"
} else if ([name length] == 0) {
  alertMessage = @"Name not written. Please write a name in settings";
  NSLog(@"3 name not written");
} else if (!NSStringIsValidEmail(email)) {
  alertMessage = @"Your email is not valid";
  NSLog(@"4 email not valid");
} else if ([email length] == 0) {
  alertMessage = @"Email not written. Please write a name in settings";
  NSLog(@"5 email not written ");
}
于 2013-11-05T18:34:30.330 回答