Question

我有一个ViewController，它包含我的应用程序用户填写并提交的一系列UITextFields（表单）（通过点击UIButton）。数据发布到外部数据库（MySQL），一切都很好。但是，我希望所有的UITextField都是“必需的”;换句话说，除非填写所有字段（包含值），否则“提交”按钮不应发布数据。有谁知道我会怎么做呢？请参阅下面的代码。

ViewController.h

-(IBAction)addParty:(id)sender;

@property (strong, nonatomic) IBOutlet UITextField *firstname;
@property (strong, nonatomic) IBOutlet UITextField *lastname;
@property (strong, nonatomic) IBOutlet UITextField *guestphone;
@property (strong, nonatomic) IBOutlet UITextField *guestemail;
@property (strong, nonatomic) IBOutlet UITextField *guestsize;

@end

ViewController.m

- (IBAction)addParty:(id)sender
{


    NSString *strURL = [NSString stringWithFormat:@"guestfirst=%@&guestlast=%@&guestphone=%@&guestemail=%@&guestsize=%@", firstname.text, lastname.text, guestphone.text, guestemail.text, guestsize.text];
    NSLog(@"%@", strURL);


    NSData *postData = [strURL dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:@"postgl.php"]];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Current-Type"];
    [request setHTTPBody:postData];


    NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:request delegate:self];

    if(conn)
    {
        NSLog(@"Connection Successful");

        [thankyou setHidden:NO];         
    }
    else
    {
         [thankyou setHidden:YES];
        NSLog(@"Connection could not be made");
    }

}

Answer 1

一种解决方案是将textfields的委托设置为UIViewController。

在委托方法

中实现以下内容

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

实现此功能后，您应该拥有如下方法：

- (BOOL)enableSubmitButton
{
    for (UITextField *textField in @[self.firstname, self.lastname, self.guestphone, self.guestemail, self.guestsize]) {
        if (textfield.text.length == 0) {
            return NO;
        }
    }
    return YES;
}

然后你应该有一个按钮组的IBOutlet，你可以在shouldChangeCharactersInRange内部调用enableSubmitButton并将按钮设置为启用，即

。

@property (nonatomic, weak) IBOutlet UIButton *submitButton;

or could be UIBarButtonItem

@property (nonatomic, weak) IBOutlet UIBarButtonItem *submitButton;

self.submitButton.enabled = [self enableSubmitButton];

Answer 2

对于未来的观众来说，值得注意的是，使用KVO收集运营商可以非常轻松地完成这项工作。

int system (constant char *command)

Answer 3

嵌入if / else语句最终为我工作（例如，如果填写3/5字段，除非5/5完成，否则数据不会发布）。谢谢大家的帮助！

  - (IBAction)addParty:(id)sender

{

    for (UITextField *textFielda in @[self.firstname]) {
        if (textFielda.text.length == 0) {

             [pleasefinish setHidden:NO];

        }

        for (UITextField *textFieldb in @[self.lastname]) {
            if (textFieldb.text.length == 0) {

                [pleasefinish setHidden:NO];

            }

        for (UITextField *textFieldc in @[self.guestphone]) {
                if (textFieldc.text.length == 0) {

                    [pleasefinish setHidden:NO];

                }

        for (UITextField *textFieldd in @[self.guestemail]) {
                    if (textFieldd.text.length == 0) {

                        [pleasefinish setHidden:NO];

                    }

        for (UITextField *textFielde in @[self.guestsize]) {
                        if (textFielde.text.length == 0) {

                            [pleasefinish setHidden:NO];

                        }

        else {

         [pleasefinish setHidden:YES];

    NSString *strURL = [NSString stringWithFormat:@"guestfirst=%@&guestlast=%@&guestphone=%@&guestemail=%@&guestsize=%@", firstname.text, lastname.text, guestphone.text, guestemail.text, guestsize.text];
    NSLog(@"%@", strURL);


    NSData *postData = [strURL dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:@"postgl.php"]];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Current-Type"];
    [request setHTTPBody:postData];


    NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:request delegate:self];



    if(conn)
    {
        NSLog(@"Connection Successful");

       [thankyou setHidden:NO];

    }
    else
    {
       [thankyou setHidden:YES];
        NSLog(@"Connection could not be made");
    }


}
    }

                }


            }
        }
    }
}

Answer 4

在发送请求之前，您可以执行嵌套的if语句，检查空字符串值。

所以如果你有3个需要的文本字段，那么3个嵌套的if语句可以解决问题。

如何制作“必需的”UITextFields？

4 个答案: