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

+(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 the content

- (id)initWithSuperview:(UIView*)sview andContent:(NSString*)pContent
{
    self = [super init];
    if (self) {
        // Initialization code here.
        self.bgView = [[UIView alloc] initWithFrame: sview.bounds] ;
        [sview addSubview: self.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 UITextView

-(void)doTransitionWithContent:(NSString*)popupContent
{
    //faux view
    UIView* fauxView = [[UIView alloc] initWithFrame: CGRectMake(10, 10, 200, 200)] ;
    [self.bgView addSubview: fauxView];

    //the new panel
    self.bigPanelView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.bgView.frame.size.width, self.bgView.frame.size.height)];
    self.bigPanelView.center = CGPointMake( self.bgView.frame.size.width/2, self.bgView.frame.size.height/2);
    self.bigPanelView.backgroundColor = [UIColor lightGrayColor];




    //add the text view
    int offsetx = 20;
    int offsety = 50;

    UITextView *view = [[UITextView alloc] initWithFrame:CGRectInset(self.bigPanelView.frame, offsetx, offsety)];
    view.backgroundColor = [UIColor clearColor];


    view.text = popupContent;


    [self.bigPanelView addSubview: view];

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

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

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

        //dim the contents behind the popup window
        UIView* shadeView = [[UIView alloc] initWithFrame:self.bigPanelView.frame] ;
        shadeView.backgroundColor = [UIColor blackColor];
        shadeView.alpha = 0.3;
        shadeView.tag = kShadeViewTag;
        [self.bigPanelView addSubview: shadeView];
        [self.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];
    [[self.bigPanelView viewWithTag: kShadeViewTag] removeFromSuperview];

}

// Animates the window and when done removes all views from the view hierarchy
-(void)closePopupWindowAnimate
{

    //faux view
    __block UIView* fauxView = [[UIView alloc] initWithFrame: CGRectMake(10, 10, 200, 200)];
    [self.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:self.bigPanelView toView:fauxView duration:0.5 options:options completion:^(BOOL finished) {

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

        [self.bgView removeFromSuperview];

    }];
}

@end