Question

我想在其中创建一个包含两个uitextfield的警报视图。

method:
//show alertview for file input
- (IBAction)showAddFiles:(id)sender {
    UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Enter File Details"
                                                      message:nil
                                                     delegate:self
                                            cancelButtonTitle:@"Cancel"
                                            otherButtonTitles:@"Add", nil];



    UITextField *textFieldDescription = [message textFieldAtIndex:0];
    textFieldDescription.placeholder = @"File Description : Ex. Acat Briefing";
    UITextField *textFieldFileName = [message textFieldAtIndex:1];
    textFieldFileName.placeholder = @"Exact File Name : Ex. acat.pdf";


    [message show];
}


//make sure file description is long enoguh
- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView
{
    NSString *inputText = [[alertView textFieldAtIndex:0] text];

    if( [inputText length] <= 15 && [inputText length] >= 4)
    {
        return YES;
    }
    else
    {
        return NO;
    }
}

//handle add button
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
    if([title isEqualToString:@"Add"])
    {
        UITextField *fileDescription = [alertView textFieldAtIndex:0];
        UITextField *fileName = [alertView textFieldAtIndex:1];
        NSLog(@"Desc: %@\nName: %@", fileDescription.text, fileName.text);
    }
}

错误：

*由于未捕获的异常'NSInvalidArgumentException'而终止应用，原因：'textFieldIndex（0）超出了文本字段数组的范围'

为什么我会收到此错误，如何在警报视图中创建两个uitextfield？

=========工作解决方案=========== 感谢下面的答案，只需要两个纯文本字段

//show alertview for file input
- (IBAction)showAddFiles:(id)sender {
    UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Enter File Details"
                                                      message:nil
                                                     delegate:self
                                            cancelButtonTitle:@"Cancel"
                                            otherButtonTitles:@"Add", nil];



    [message setAlertViewStyle:UIAlertViewStyleLoginAndPasswordInput];
    UITextField *fileDescription = [message textFieldAtIndex:0];
    fileDescription.placeholder=@"Ex. acat.pdf";
    [[message textFieldAtIndex:1] setSecureTextEntry:NO];
    UITextField *fileName= [message textFieldAtIndex:1];
    fileName.placeholder=@"Ex. Acat Briefing";

    [message show];
}

Answer 1

分配“消息”警报视图后。将其添加到您的代码中：

[message setAlertViewStyle:UIAlertViewStyleLoginAndPasswordInput];
[[message textFieldAtIndex:1] setSecureTextEntry:NO];

这将使你的警报视图里面有两个文本字段。

Answer 2

您收到的错误是因为UIAlertView，'消息'中没有文字字段。实例方法“textFieldAtIndex”用于访问使用特定样式创建的UIAlertView中的textField，例如UIAlertViewStylePlainTextInput，UIAlertViewStyleSecureTextInput或UIAlertViewStyleLoginAndPasswordInput。这些样式在属性“alertViewStyle”上设置。例如：

[message setAlertViewStyle:UIAlertViewStylePlainTextInput];

设置此属性后，您可以使用“textFieldAtIndex”，但不幸的是，这些样式似乎都不适合您的需要。

我以前做的是创建默认样式的UIAlertView（就像你已经完成的那样），并将UITextFields作为子视图添加到UIAlertView。

例如：

//Create the alert then add any labels and text fields as subviews.
//You can pad out an alertView by adding newline characters in the message.  This will
// give the alertView more space to draw the text fields.
UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Two Text Field Alert" 
                                                         message:@"\n\n\n\n\n" 
                                                        delegate:self 
                                               cancelButtonTitle:@"CanceL" 
                                               otherButtonTitles:@"OK", nil];

UITextField *textField1 = [[UITextField alloc] initWithFrame:CGRectMake(16,83,252,25)];
textField1.borderStyle = UITextBorderStyleRoundedRect;
textField1.keyboardAppearance = UIKeyboardAppearanceAlert;
textField1.delegate = self;
[message addSubview:textField1];

UITextField *textField2 = [[UITextField alloc] initWithFrame:CGRectMake(16,112,252,25)];
textField2.placeholder = @"Password";
textField2.borderStyle = UITextBorderStyleRoundedRect;
textField2.keyboardAppearance = UIKeyboardAppearanceAlert;
textField2.delegate = self;
[message addSubview:textField2];
[message show];

[message release];
[textField2 release];
[textField1 release];

与alertView样式相比，以这种方式登录更加冗长和混乱，但您可以根据需要调整此值，以便将任意数量的子视图添加到警报视图。

编辑简化示例。

Answer 3

您收到该错误，因为UIAlertView不包含任何文本字段。由于当您尝试拨打[alertView textFieldAtIndex:0]时警报视图的文本字段集合为空，因此您最终会遇到NSInvalidArgumentException并崩溃。

Answer 4

我们被允许在alertview中只创建两个文本字段。这里：

UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Change Password"
                                                 message:@""
                                                delegate:self
                                       cancelButtonTitle:@"Cancel"
                                       otherButtonTitles:@"OK", nil];

alert.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput;
UITextField * alertTextField1 = [alert textFieldAtIndex:0];
alertTextField1.keyboardType = UIKeyboardTypeDefault;
alertTextField1.placeholder = @"Type Current password";
[[alert textFieldAtIndex:0] setSecureTextEntry:YES];

UITextField * alertTextField2 = [alert textFieldAtIndex:1];
alertTextField2.keyboardType = UIKeyboardTypeDefault;
alertTextField2.placeholder = @"Type New Password";

[alert show];

Answer 5

以下是您问题的解决方案.. http://www.alterplay.com/ios-dev-tips/2009/12/username-and-password-uitextfields-in-uialertview-prompt.html

如何在警报视图IOS中创建两个文本字段

5 个答案: