VTUIUtils.h/m - spinner overlay

gistfile1.m

// VTUIUtils.h

#import <Foundation/Foundation.h>


@interface VTUIUtils : NSObject {

}

+ (void)fadeInOverlay: (UIView*)parentView;
+ (void)fadeOutOverlay: (UIView*)parentView;
+ (void)fadeInOverlayOnMainWindow;
+ (void)fadeOutOverlayOnMainWindow;

+ (void)accessibilityAnnouncement: (NSString*)message;

@end

// VTUIUtils.m


#import "VTUIUtils.h"
#import <QuartzCore/QuartzCore.h>

@implementation VTUIUtils

static NSMutableDictionary* _fadeMap;

+ (void)accessibilityAnnouncement: (NSString*)message
{
	// TODO: if (UIAccessibilityIsVoiceOverRunning())
	{
		UIAccessibilityPostNotification(1008, message);
		//UIAccessibilityPostNotification(UIAccessibilityAnnouncementNotification, msg);
	}
}

+ (void)fadeInOverlay: (UIView*)parentView
{
	if (parentView == nil)
	{
		NSLog(@"fadeOutOverlay: No corresponding view (%@)", parentView);
		return;
	}
	if ( [_fadeMap objectForKey:parentView] != nil )
	{
		NSLog(@"fadeOutOverlay: View exists (%@)", parentView);
		return;
	}
	UIView* fadeView = [[UIView alloc] initWithFrame:parentView.frame];
	UIActivityIndicatorView* spinner = [[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge] autorelease];
	fadeView.alpha = 0;
	if (fadeView != nil)
	{
		UIView* darkView = [[[UIView alloc] initWithFrame:fadeView.frame] autorelease];
		darkView.backgroundColor = [UIColor blackColor];
		darkView.alpha = 0.33;

		spinner.center = fadeView.center;
		
		CGRect rect = spinner.frame;
		rect.origin.x -= rect.size.width/2;
		rect.origin.y -= rect.size.height/2;
		rect.size.width *= 2;
		rect.size.height *= 2;
		//UIButton* blackrect = [UIButton buttonWithType:UIButtonTypeRoundedRect];
		UIView* blackrect = [[[UIView alloc] initWithFrame: rect] autorelease];
		blackrect.backgroundColor = [UIColor blackColor];
		blackrect.opaque = NO;
		blackrect.layer.cornerRadius = 8.0;
		[fadeView addSubview:darkView];
		[fadeView addSubview:blackrect];
		[fadeView addSubview:spinner];
		[parentView addSubview:fadeView];
		[spinner startAnimating];
		
		[UIView beginAnimations:nil context:fadeView];
		[UIView setAnimationDuration: 0.3];
		[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
		fadeView.alpha = 1;
		[UIView commitAnimations];
		if (_fadeMap == nil)
			_fadeMap = [[NSMutableDictionary alloc] initWithCapacity:3];
		id key = [NSNumber numberWithInt:(int)parentView];
		[_fadeMap setObject:fadeView forKey:key];
	}
}

+ (void)fadeOutAnimationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(UIView*)context
{
	// context contains the fade out UIView
	[context removeFromSuperview];
	context = nil;
}

+ (void)fadeOutOverlay: (UIView*)parentView
{
	id key = [NSNumber numberWithInt:(int)parentView];
	UIView* _fadeView = [_fadeMap objectForKey:key];
	if (_fadeView != nil)
	{
		[UIView beginAnimations:nil context:_fadeView];
		[UIView setAnimationBeginsFromCurrentState:YES];
		[UIView setAnimationDuration: 0.3];
		[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
		[UIView setAnimationDelegate:[VTUIUtils class]];
		[UIView setAnimationDidStopSelector:@selector(fadeOutAnimationDidStop:finished:context:)];
		_fadeView.alpha = 0;
		[UIView commitAnimations];
		[_fadeMap removeObjectForKey:key];
	} else {
		NSLog(@"fadeOutOverlay: No corresponding view (%@)", parentView);
	}
}

+ (void)fadeInOverlayOnMainWindow
{
	[VTUIUtils fadeInOverlay: [[[UIApplication sharedApplication] windows] objectAtIndex:0]];
}

+ (void)fadeOutOverlayOnMainWindow
{
	[VTUIUtils fadeOutOverlay: [[[UIApplication sharedApplication] windows] objectAtIndex:0]];
}

@end