如何在警報視圖中創建兩個文本框，IOS

Question

我想創建一個包含兩個uitextfields的警報視圖。

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); 
    } 
} 

錯誤：

*終止應用程序由於未捕獲的異常 'NSInvalidArgumentException'，原因： 'textFieldIndex（0）是文本字段中的數組的範圍之外'

爲什麼我得到這個錯誤，我怎麼能在一個alert視圖中創建兩個uitextfields？

=========工作液=========== 感謝以下作品的答案時，你只需要兩個簡單的文本框

//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

在您分配「消息」警報視圖。將此代碼添加到您的代碼中：

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

這將使您的警報視圖裏面的兩個文本字段。

Answer 2

這裏是解決方案爲您的問題.. http://www.alterplay.com/ios-dev-tips/2009/12/username-and-password-uitextfields-in-uialertview-prompt.html

Answer 3

由於UIAlertView不包含任何文本字段，因此會出現該錯誤。由於當您嘗試致電[alertView textFieldAtIndex:0]時，警報視圖的文本字段集合是空的，因此最終會出現NSInvalidArgumentException併發生崩潰。

Answer 4

您收到的錯誤發生是因爲UIAlertView'消息'中沒有文本字段。實例方法「textFieldAtIndex」用於訪問使用特定樣式創建的UIAlertView中的文本字段，如UIAlertViewStylePlainTextInput,UIAlertViewStyleSecureTextInput或UIAlertViewStyleLoginAndPasswordInput。這些樣式在屬性「alertViewStyle」上設置。例如：

[message setAlertViewStyle:UIAlertViewStylePlainTextInput]; 

您可以設置此屬性後使用「textFieldAtIndex」，但不幸的是它看起來好像沒有這些款式滿足您的需求。

我之前所做的是創建一個默認樣式的UIAlertView（就像您已經完成的那樣），並將UITextFields作爲子視圖添加到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]; 

這是一個很多更詳細的和凌亂做一個登錄而不是在alertView風格這種方式，但您認爲合適的任何數量的子視圖添加到您能適應這個一個警報視圖。

編輯簡化示例。

Answer 5

我們只允許在alertview中創建兩個文本字段。這裏：

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];