MTPopupWindow.m

//
//
//  MTPopupWindow.m
//
//

#import "MTPopupWindow.h"

#define kShadeViewTag 1000

@interface MTPopupWindow(Private)
- (id)initWithSuperview:(UIView*)sview andContent:(NSString*)pContent;
@end

@implementation MTPopupWindow
@synthesize closeBtn = _closeBtn, bigPanelView = _bigPanelView, bgView = _bgView;
/**
 * This is the only public method, it opens a popup window and loads the given content
 * @param NSString* fileName provide a file name to load a file from the app resources, or a URL to load a web page
 * @param UIView* view provide a UIViewController's view here (or other view)
 */
+(void)showWindowWithContent:(NSString*)popupContent insideView:(UIView*)view
{
    (void)[[MTPopupWindow alloc] initWithSuperview:view andContent:popupContent]; // Cast to void because we don't use the result (otherwise compiler warning)
}

/**
 * Initializes the class instance, gets a view where the window will pop up in
 * and a file name/ URL
 */
- (id)initWithSuperview:(UIView*)sview andContent:(NSString*)pContent
{
    self = [super init];
    if (self) {
        // Initialization code here.
        _bgView = [[UIView alloc] initWithFrame: sview.bounds] ;
        [sview addSubview: _bgView];

        // proceed with animation after the bgView was added
        [self performSelector:@selector(doTransitionWithContent:) withObject:pContent afterDelay:0.1];
    }

    return self;
}

/**
 * Afrer the window background is added to the UI the window can animate in
 * and load the UIWebView
 */
-(void)doTransitionWithContent:(NSString*)popupContent
{
    //faux view
    UIView* fauxView = [[UIView alloc] initWithFrame: CGRectMake(10, 10, 200, 200)] ;
    [_bgView addSubview: fauxView];

    //the new panel
    _bigPanelView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, _bgView.frame.size.width, _bgView.frame.size.height)];
    _bigPanelView.center = CGPointMake( _bgView.frame.size.width/2, _bgView.frame.size.height/2);

    //add the window background
    UIImageView* background = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"popupWindowBack.png"]] ;
    background.center = CGPointMake(_bigPanelView.frame.size.width/2, _bigPanelView.frame.size.height/2);
    [_bigPanelView addSubview: background];

    //add the text view
    int offset = 10;

    UITextView *view = [[UITextView alloc] initWithFrame:CGRectInset(background.frame, offset, offset)];
    view.backgroundColor = [UIColor clearColor];


    view.text = popupContent;


    [_bigPanelView addSubview: view];

    //add the close button
    int closeBtnOffset = 10;
    UIImage* closeBtnImg = [UIImage imageNamed:@"popupCloseBtn.png"];
    _closeBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    [_closeBtn setImage:closeBtnImg forState:UIControlStateNormal];
    [_closeBtn setFrame:CGRectMake( background.frame.origin.x + background.frame.size.width - closeBtnImg.size.width - closeBtnOffset,
                                   background.frame.origin.y ,
                                   closeBtnImg.size.width + closeBtnOffset,
                                   closeBtnImg.size.height + closeBtnOffset)];
    [_closeBtn addTarget:self action:@selector(closePopupWindow) forControlEvents:UIControlEventTouchUpInside];
    [_bigPanelView addSubview: _closeBtn];

    //animation options
    UIViewAnimationOptions options = UIViewAnimationOptionTransitionFlipFromRight |
                                        UIViewAnimationOptionAllowUserInteraction    |
                                        UIViewAnimationOptionBeginFromCurrentState;

    //run the animation
    [UIView transitionFromView:fauxView toView:_bigPanelView duration:0.5 options:options completion: ^(BOOL finished) {

        //dim the contents behind the popup window
        UIView* shadeView = [[UIView alloc] initWithFrame:_bigPanelView.frame] ;
        shadeView.backgroundColor = [UIColor blackColor];
        shadeView.alpha = 0.3;
        shadeView.tag = kShadeViewTag;
        [_bigPanelView addSubview: shadeView];
        [_bigPanelView sendSubviewToBack: shadeView];
    }];
}

/**
 * Removes the window background and calls the animation of the window
 */
-(void)closePopupWindow
{
    //remove the shade
    [self performSelector:@selector(closePopupWindowAnimate) withObject:nil afterDelay:0.1];
    [[_bigPanelView viewWithTag: kShadeViewTag] removeFromSuperview];

}

/**
 * Animates the window and when done removes all views from the view hierarchy
 * since they are all only retained by their superview this also deallocates them
 * finally deallocate the class instance
 */
-(void)closePopupWindowAnimate
{

    //faux view
    __block UIView* fauxView = [[UIView alloc] initWithFrame: CGRectMake(10, 10, 200, 200)];
    [_bgView addSubview: fauxView];

    //run the animation
    UIViewAnimationOptions options = UIViewAnimationOptionTransitionFlipFromLeft |
    UIViewAnimationOptionAllowUserInteraction    |
    UIViewAnimationOptionBeginFromCurrentState;

    //hold to the bigPanelView, because it'll be removed during the animation

    [UIView transitionFromView:_bigPanelView toView:fauxView duration:0.5 options:options completion:^(BOOL finished) {

        //when popup is closed, remove all the views
        for (UIView* child in _bigPanelView.subviews) {
            [child removeFromSuperview];
        }
        for (UIView* child in _bgView.subviews) {
            [child removeFromSuperview];
        }

        [_bgView removeFromSuperview];

    }];
}

@end