danmartyn

// Doing something on the main thread

dispatch_queue_t myQueue = dispatch_queue_create("My Queue",NULL);
dispatch_async(myQueue, ^{
    // Perform long running process

    dispatch_async(dispatch_get_main_queue(), ^{
        // Update the UI

    });

danmartyn

Taken From: http://stablekernel.com/blog/speeding-up-nscoding-with-macros/

#define OBJC_STRINGIFY(x) @#x
#define encodeObject(x) [aCoder encodeObject:x forKey:OBJC_STRINGIFY(x)]
#define decodeObject(x) x = [aDecoder decodeObjectForKey:OBJC_STRINGIFY(x)]
#define encodeFloat(x) [aCoder encodeFloat:x forKey:OBJC_STRINGIFY(x)]
#define decodeFloat(x) x = [aDecoder decodeFloatForKey:OBJC_STRINGIFY(x)]

- (id)initWithCoder:(NSCoder *)aDecoder
{

danmartyn

1) Choose the target you want to add to
2) Choose Build Settings
3) Search for 'macros'
4) Add a macro

To use the macro in the app:
#ifdef MACRO
  // do some stuff
#elif OTHERMACRO
  // do other stuff

danmartyn

- (NSString *)appNameAndVersionNumberDisplayString {
    NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
    NSString *appDisplayName = [infoDictionary objectForKey:@"CFBundleDisplayName"];
    NSString *majorVersion = [infoDictionary objectForKey:@"CFBundleShortVersionString"];
    NSString *minorVersion = [infoDictionary objectForKey:@"CFBundleVersion"];

    return [NSString stringWithFormat:@"%@, Version %@ (%@)", 
                appDisplayName, majorVersion, minorVersion];
}

danmartyn

+(void)restart:(id)sender
{
    NSString *restartScript = @"while ps -p $1 > /dev/null; do sleep 0.1; done; open \"$2\"";
    NSArray *arguments = [NSArray arrayWithObjects:
                          @"-c", restartScript,
                          @"",
                          [NSString stringWithFormat:@"%d",[[NSProcessInfo processInfo] processIdentifier]],
                          [[NSBundle mainBundle] bundlePath],
                          nil];
    [NSTask launchedTaskWithLaunchPath:@"/bin/sh" arguments:arguments];

danmartyn

+ (<#Class#> *)sharedManager
{
    static <#Class#> *sharedManager = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedManager = [[<#Class#> alloc] init];
        // other initialisation stuff
    });
    return sharedManager;
}

danmartyn

#pragma mark -
#pragma mark UIImagePickerController Delegate Methods

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    // dismiss the picker
    if (self.popover)
    {
        [self.popover dismissPopoverAnimated:YES];
        self.popover = nil;

danmartyn

UIImagePickerController *libraryController = [[UIImagePickerController alloc] init];
        libraryController.delegate = self;
        libraryController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        libraryController.allowsEditing = YES;
        
        // if on the ipad, show the library in a popover
        if (iPad)
        {
            UIPopoverController *libraryPopover = [[UIPopoverController alloc] initWithContentViewController:libraryController];
            [libraryPopover presentPopoverFromRect:self.rectToPresentPopoverFrom inView:self.scrollView permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

danmartyn

// setup a picker for the camera
        UIImagePickerController *cameraController = [[UIImagePickerController alloc] init];
        cameraController.delegate = self;
        cameraController.sourceType = UIImagePickerControllerSourceTypeCamera;
        cameraController.allowsEditing = YES;
        [self presentViewController:cameraController animated:YES completion:nil];

danmartyn

// Link Against Assets Library
// #import <AssetsLibrary/AssetsLibrary.h>

ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    
    // Enumerate just the photos and videos group by using ALAssetsGroupSavedPhotos.
    [library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop)
    {        
        // Within the group enumeration block, filter to enumerate just photos.
        [group setAssetsFilter:[ALAssetsFilter allPhotos]];