用户输入时如何检查 textFiled 输入字符串 [英] How to check the textFiled input string when user inputting

问题描述

我有问题.
我有四个文本字段，但我不知道如何检查输入字符串的文本字段.

I have a problem.
I have four textfields, but I don't know how to check the textfield that input String.

• nameField 不超过 10 个字符串
• ageField 检查是否为数字
• sexField 检查男性或女性

• nameField doesn't over 10 strings
• ageField check whether is number or not
• sexField check male or female

这是我的代码:

- (IBAction)addComment:(id)sender {

    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Commend" message:nil preferredStyle:UIAlertControllerStyleAlert];

    [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"Please input your name:";
    }];
    [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"Please input your age:";
    }];
    [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"Please input your sex:";
    }];
    [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"Please input your commend:";
    }];

    UIAlertAction *sendAction = [UIAlertAction actionWithTitle:@"send" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

        UITextField *nameField = alertController.textFields[0];
        UITextField *ageField = alertController.textFields[1];
        UITextField *sexField = alertController.textFields[2];
        UITextField *commentField = alertController.textFields[3];


        UIAlertController *successAlertController = [UIAlertController alertControllerWithTitle:@"Alert" message:@"Success" preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

            [self.navigationController popViewControllerAnimated:YES];

        }];
        [successAlertController addAction:okAction];
        [self presentViewController:successAlertController animated:YES completion:nil];


    }];

    [alertController addAction:sendAction];
    [self presentViewController:alertController animated:YES completion:nil];

}

谢谢！

推荐答案

按照以下步骤操作，可能会有所帮助:

Follow below steps, may it help:

1. 将 delegate 和 tag 设置为 UIAlertController 文本字段.

1. Set delegate and tag to UIAlertController textfields.

现在使用 UITextField 委托方法 shouldChangeCharactersInRange 在键入时验证文本或使用 textFieldDidEndEditing 在文本字段结束编辑后进行检查.检查使用它的标签来区分 textFields.

Now use UITextField delegate method shouldChangeCharactersInRange to validate text while typing OR use textFieldDidEndEditing to check after textfield end editing . Check using it's tag to differentiate between textFields.

喜欢

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

if(textField.tag==TxtNameTag){

   //Validate Name textField
}
//Same way for other textFields


    return YES; 
}

OR 使用 textFieldDidEndEditing 在 textField 结束编辑时进行验证.

OR Use textFieldDidEndEditing to validate while textField end editing.

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