Simple iOS loading view

LoadingView.h

//
//  LoadingView.h
//  Created by Stephanie Sharp on 26/05/13.
//
// http://www.sitepoint.com/all-purpose-loading-view-for-ios/
// http://www.cocoawithlove.com/2009/04/showing-message-over-iphone-keyboard.html

#import <UIKit/UIKit.h>

@interface LoadingView : UIView

+(LoadingView *)loadingViewInView:(UIView *)superView;
-(void)removeView;

@end

LoadingView.m

//
//  LoadingView.m
//  Created by Stephanie Sharp on 26/05/13.
//

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

@implementation LoadingView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

#pragma mark - Class methods

+(LoadingView *)loadingViewInView:(UIView *)superView
{
  // Create a new view with the same frame size as the superView
	LoadingView * loadingView = [[LoadingView alloc] initWithFrame:superView.bounds];
    
	// If something's gone wrong, abort!
	if(!loadingView)
        return nil;
    
    loadingView.opaque = NO;
    
    // Create background view and add as subview
    UIView * background = [[UIView alloc] initWithFrame:loadingView.frame];
    loadingView.backgroundColor = [UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.5f];
    [loadingView addSubview:background];
    
    // Add activity indicator
    UIActivityIndicatorView * indicator = [[UIActivityIndicatorView alloc]
                                           initWithActivityIndicatorStyle: UIActivityIndicatorViewStyleWhiteLarge];
	
    // Set the resizing mask so it's not stretched
    indicator.autoresizingMask = UIViewAutoresizingFlexibleTopMargin |
                                 UIViewAutoresizingFlexibleRightMargin |
                                 UIViewAutoresizingFlexibleBottomMargin |
                                 UIViewAutoresizingFlexibleLeftMargin;
    
	// Place it in the middle of the view
    indicator.center = superView.center;
    
	// Add it into the loadingView
    [loadingView addSubview:indicator];
    
	// Start it animating
	[indicator startAnimating];

	// Add the loading view to the superView.
	[superView addSubview:loadingView];
    
    // Create a new fade animation & add to superview
    CATransition * animation = [CATransition animation];
	[animation setType:kCATransitionFade];
	[[superView layer] addAnimation:animation forKey:@"layerAnimation"];
    
	return loadingView;
}

#pragma mark

-(void)removeView
{
    CATransition * animation = [CATransition animation];
	[animation setType:kCATransitionFade];
	[[[self superview] layer] addAnimation:animation forKey:@"layerAnimation"];
    
	[super removeFromSuperview];
}

@end