TextAlertView

#import 

#define kUITextFieldHeight 30.0
#define kUITextFieldXPadding 12.0
#define kUITextFieldYPadding 10.0
#define kUIAlertOffset 100.0

@interface TextAlertView : UIAlertView {
 UITextField *textField;
 BOOL layoutDone;
}

@property (nonatomic, retain) UITextField *textField;

- (id)initWithTitle:(NSString *)title message:(NSString *)message delegate:(id)delegate 
  cancelButtonTitle:(NSString *)cancelButtonTitle otherButtonTitles:(NSString *)otherButtonTitles, ...;

@end

#import "TextAlertView.h"

@implementation TextAlertView

@synthesize textField;

/*
 * Initialize view with maximum of two buttons
 */
- (id)initWithTitle:(NSString *)title message:(NSString *)message delegate:(id)delegate 
  cancelButtonTitle:(NSString *)cancelButtonTitle otherButtonTitles:(NSString *)otherButtonTitles, ... {
 self = [super initWithTitle:title message:message delegate:delegate cancelButtonTitle:cancelButtonTitle
     otherButtonTitles:otherButtonTitles, nil];
 if (self) {
  // Create and add UITextField to UIAlertView
  UITextField *myTextField = [[[UITextField alloc] initWithFrame:CGRectZero] retain];
  myTextField.autocorrectionType = UITextAutocorrectionTypeNo;
  myTextField.alpha = 0.75;
  myTextField.borderStyle = UITextBorderStyleRoundedRect;
  myTextField.delegate = delegate;
  [self setTextField:myTextField];
  // insert UITextField before first button
  BOOL inserted = NO;
  for( UIView *view in self.subviews ){
   if(!inserted && ![view isKindOfClass:[UILabel class]])
    [self insertSubview:myTextField aboveSubview:view];
  }
  
  //[self addSubview:myTextField];
  // ensure that layout for views is done once
  layoutDone = NO;
  
  // add a transform to move the UIAlertView above the keyboard
  CGAffineTransform myTransform = CGAffineTransformMakeTranslation(0.0, kUIAlertOffset);
  [self setTransform:myTransform];
 }
 return self;
}

/*
 * Show alert view and make keyboard visible
 */
- (void) show {
 [super show];
 [[self textField] becomeFirstResponder];
}

/*
 * Determine maximum y-coordinate of UILabel objects. This method assumes that only
 * following objects are contained in subview list:
 * - UILabel
 * - UITextField
 * - UIThreePartButton (Private Class)
 */
- (CGFloat) maxLabelYCoordinate {
 // Determine maximum y-coordinate of labels
 CGFloat maxY = 0;
 for( UIView *view in self.subviews ){
  if([view isKindOfClass:[UILabel class]]) {
   CGRect viewFrame = [view frame];
   CGFloat lowerY = viewFrame.origin.y + viewFrame.size.height;
   if(lowerY > maxY)
    maxY = lowerY;
  }
 }
 return maxY;
}

/*
 * Override layoutSubviews to correctly handle the UITextField
 */
- (void)layoutSubviews {
 [super layoutSubviews];
 CGRect frame = [self frame];
 CGFloat alertWidth = frame.size.width;
 
 // Perform layout of subviews just once
 if(!layoutDone) {
  CGFloat labelMaxY = [self maxLabelYCoordinate];
  
  // Insert UITextField below labels and move other fields down accordingly
  for(UIView *view in self.subviews){
      if([view isKindOfClass:[UITextField class]]){
    CGRect viewFrame = CGRectMake(
             kUITextFieldXPadding, 
             labelMaxY + kUITextFieldYPadding, 
             alertWidth - 2.0*kUITextFieldXPadding, 
             kUITextFieldHeight);
    [view setFrame:viewFrame];
      } else if(![view isKindOfClass:[UILabel class]]) {
    CGRect viewFrame = [view frame];
    viewFrame.origin.y += kUITextFieldHeight;
    [view setFrame:viewFrame];
   }
  }
  
  // size UIAlertView frame by height of UITextField
  frame.size.height += kUITextFieldHeight + 2.0;
  [self setFrame:frame];
  layoutDone = YES;
 } else {
  // reduce the x placement and width of the UITextField based on UIAlertView width
  for(UIView *view in self.subviews){
      if([view isKindOfClass:[UITextField class]]){
    CGRect viewFrame = [view frame];
    viewFrame.origin.x = kUITextFieldXPadding;
    viewFrame.size.width = alertWidth - 2.0*kUITextFieldXPadding;
    [view setFrame:viewFrame];
      }
  }
 }
}
@end