huynguyencong

// IMPORTANCE: I don't use this anymore, because it has problem with a json that missing key. In normal, we can ignore a missing key by set a property optional. But in this case, setting property optional still causes no key error.

/* Huy Nguyen
Use property wrapper to reduce meaningless code in a decodable, when you need to customize how to parse just 1 key, but have to implement all keys.

This snippet assumes you need to decode some models that currency values are Strings with "$" prefix ("$20.3" to 20.3), and you want to parse them to Double values.

For example, the JSON of Product model:
      {
            "price": "$20.3",

daoseng33

class LeftAlignedCollectionViewFlowLayout: UICollectionViewFlowLayout {

    override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
        let attributes = super.layoutAttributesForElements(in: rect)

        var leftMargin = sectionInset.left
        var maxY: CGFloat = -1.0
        attributes?.forEach { layoutAttribute in
            if layoutAttribute.frame.origin.y >= maxY {
                leftMargin = sectionInset.left

auycro

//http://stackoverflow.com/questions/20271812/use-a-one-image-sprite-sheet-in-sprite-kit-ios

Entity *cookie = [[Entity alloc] initWithSpriteSheetNamed:@"cookie_sheet" withinNode:map sourceRect:CGRectMake(0, 0, 32, 32) andNumberOfSprites:6];

- (id) initWithSpriteSheetNamed: (NSString *) spriteSheet withinNode: (SKSpriteNode *) scene sourceRect: (CGRect) source andNumberOfSprites: (int) numberOfSprites {

    // @param numberOfSprites - the number of sprite images to the left
    // @param scene - I add my sprite to a map node. Change it to a SKScene
    // if [self addChild:] is used.

nonamelive

@interface UINavigationController (DMNavigationController)

- (void)didShowViewController:(UIViewController *)viewController animated:(BOOL)animated;

@end

@interface DMNavigationController ()

@property (nonatomic, assign) BOOL shouldIgnorePushingViewControllers;

hujunfeng

UIStatusBarStyle in iOS 7

• The status bar in iOS 7 is transparent, the view behind it shows through.

• The style of the status bar refers to the appearances of its content. In iOS 7, the status bar content is either dark (UIStatusBarStyleDefault) or light (UIStatusBarStyleLightContent). Both UIStatusBarStyleBlackTranslucent and UIStatusBarStyleBlackOpaque are deprecated in iOS 7.0. Use UIStatusBarStyleLightContent instead.

How to change UIStatusBarStyle

• If below the status bar is a navigation bar, the status bar style will be adjusted to match the navigation bar style (UINavigationBar.barStyle):