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POiPhone Developer's Cookbook: ModalAlert Frozen
 

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  1. POiPhone Developer's Cookbook: ModalAlert Frozen
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    <p>I've used a recipe from the iPhone Developer's Cookbook called ModalAlert in order to get some text from a user; however, when the alert is shown, the keyboard and buttons are frozen. Here is the code for the modal alert.</p> <pre><code>+(NSString *) textQueryWith: (NSString *)question prompt: (NSString *)prompt button1: (NSString *)button1 button2:(NSString *) button2 { // Create alert CFRunLoopRef currentLoop = CFRunLoopGetCurrent(); ModalAlertDelegate *madelegate = [[ModalAlertDelegate alloc] initWithRunLoop:currentLoop]; UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:question message:@"\n" delegate:madelegate cancelButtonTitle:button1 otherButtonTitles:button2, nil]; // Build text field UITextField *tf = [[UITextField alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 260.0f, 30.0f)]; tf.borderStyle = UITextBorderStyleRoundedRect; tf.tag = TEXT_FIELD_TAG; tf.placeholder = prompt; tf.clearButtonMode = UITextFieldViewModeWhileEditing; tf.keyboardType = UIKeyboardTypeAlphabet; tf.keyboardAppearance = UIKeyboardAppearanceAlert; tf.autocapitalizationType = UITextAutocapitalizationTypeWords; tf.autocorrectionType = UITextAutocorrectionTypeNo; tf.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter; // Show alert and wait for it to finish displaying [alertView show]; while (CGRectEqualToRect(alertView.bounds, CGRectZero)); // Find the center for the text field and add it CGRect bounds = alertView.bounds; tf.center = CGPointMake(bounds.size.width / 2.0f, bounds.size.height / 2.0f - 10.0f); [alertView addSubview:tf]; [tf release]; // Set the field to first responder and move it into place [madelegate performSelector:@selector(moveAlert:) withObject:alertView afterDelay: 0.7f]; // Start the run loop CFRunLoopRun(); // Retrieve the user choices NSUInteger index = madelegate.index; NSString *answer = [[madelegate.text copy] autorelease]; if (index == 0) answer = nil; // assumes cancel in position 0 [alertView release]; [madelegate release]; return answer; } </code></pre> <p>Thanks!</p>
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