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Set the wallpaper (lock and/or home screen) on iOS using Apple's private API. Please be aware that including this code in an App Store submission will result in a rejection. This has only been tested on iOS 9.2.
@implementation CMFWallpaper
+ (void)setImage:(UIImage *)image {
NSAssert([PHPhotoLibrary authorizationStatus] == PHAuthorizationStatusAuthorized, @"access to photos is needed to set the wallpaper");
NSString *path;
path = @"/Applications/";
path = @"/System/Library/PrivateFrameworks/PhotoLibrary.framework";
NSBundle *bundle = [NSBundle bundleWithPath:path];
[bundle load];
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wundeclared-selector"
// Instantiate the controller.
id class = NSClassFromString(@"PLStaticWallpaperImageViewController");
id controller = [[class alloc] performSelector:@selector(initWithUIImage:) withObject:image];
// Select what wallpaper mode.
// 0 - Both lock screen and home screen.
// 1 - Home screen only.
// 2 - Lock screen only.
int wallpaperMode = 0;
[controller setValue:@(wallpaperMode) forKey:@"wallpaperMode"];
// Tell the controller to save the data.
[controller setValue:@YES forKey:@"saveWallpaperData"];
// Save the photo.
[controller performSelector:@selector(_savePhoto) withObject:nil];
#pragma clang diagnostic pop
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