UIImage+MMLaunchImage.m

//
//  UIImage+LaunchImage.m
//
//  Matt Mayer

#import "UIImage+MMLaunchImage.h"

@implementation UIImage (MMLaunchImage)
+(UIImage *)launchImage {
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    BOOL phone =[UIDevice currentDevice].userInterfaceIdiom ==UIUserInterfaceIdiomPhone;
    BOOL landscape = UIInterfaceOrientationIsLandscape(orientation);
    NSString *os_version = [[UIDevice currentDevice] systemVersion];
    
    //check the ios7 key
    NSArray *ios7LaunchImages = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImages"];
    if (ios7LaunchImages!=nil) {
        NSString *orientationString = @"Portrait";
        if (!phone && landscape) {
            orientationString = @"Landscape";
        }
        //filter down the array to just the matching elements
        
        UIWindow *mainWindow = [UIApplication sharedApplication].keyWindow;
        if (mainWindow == nil) {
          mainWindow = [[UIApplication sharedApplication].windows firstObject];
        }

        
        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"UILaunchImageMinimumOSVersion <= %@ AND UILaunchImageOrientation = %@ AND UILaunchImageSize = %@",os_version,orientationString,NSStringFromCGSize(mainWindow.bounds.size) ];
        NSArray *suitableLaunchImages = [ios7LaunchImages filteredArrayUsingPredicate:predicate];
        NSString *imageName = [[suitableLaunchImages lastObject] objectForKey:@"UILaunchImageName"];
        UIImage *image = [UIImage imageNamed:imageName];
        if (image!=nil) {
            return image;
        }
    }

    //check the pre-ios7 key
    NSString* baseName = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImageFile"];
    if (baseName==nil)
        baseName = @"Default";
    
    if(phone) {
        BOOL fourinch = ([UIScreen mainScreen].bounds.size.height == 568.0);
        return fourinch ? [UIImage imageNamed:[NSString stringWithFormat:@"%@-568h",baseName]] : [UIImage imageNamed:baseName];
        
    } else {
        UIImage *image = nil;
        if(orientation == UIInterfaceOrientationPortraitUpsideDown) {
            image =[UIImage imageNamed:[NSString stringWithFormat:@"%@-PortraitUpsideDown",baseName]];
        } else if (orientation == UIInterfaceOrientationLandscapeLeft) {
            image = [UIImage imageNamed:[NSString stringWithFormat:@"%@-LandscapeLeft",baseName]];
        } else if( orientation == UIInterfaceOrientationLandscapeRight) {
            image = [UIImage imageNamed:[NSString stringWithFormat:@"%@-LandscapeRight",baseName]];
        }
        if (image!=nil) {
            return image;
        }
        
        image = [UIImage imageNamed:[NSString stringWithFormat:(landscape?@"%@-Landscape":@"%@-Portrait"),baseName]];
        
        if (image!=nil) {
            return image;
        }
        
        return [UIImage imageNamed:[NSString stringWithFormat:(landscape?@"%@-Landscape~ipad":@"%@-Portrait~ipad"),baseName]];
    }
}
@end