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// in a UITableViewController (or any other view controller with a UITableView)

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
    UIView *header = [[UIView alloc] initWithFrame:CGRectMake(0, 0, size.width, 0)];
    header.translatesAutoresizingMaskIntoConstraints = NO;
    
    // [add subviews and their constraints to header]

    NSLayoutConstraint *headerWidthConstraint = [NSLayoutConstraint 

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// how to programatically create NSLayoutConstraints inside a playground

import UIKit

let viewFrame = CGRect(x: 0, y: 0, width: 640, height: 750)
let view = UIView(frame: viewFrame)
view.backgroundColor = UIColor.greenColor()

// initially the subView will obscure the entire view
let subView = UIVisualEffectView(effect: UIBlurEffect(style: UIBlurEffectStyle.Dark))

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<?xml version="1.0" encoding="utf-8"?>
<resources>

    <!-- RED -->
    <color name="red_50">#FFEBEE</color>
    <color name="red_100">#FFCDD2</color>
    <color name="red_200">#EF9A9A</color>
    <color name="red_300">#E57373</color>
    <color name="red_400">#EF5350</color>
    <color name="red_500">#F44336</color>

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package retrofit.converter;

import com.bluelinelabs.logansquare.LoganSquare;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;

import retrofit.converter.ConversionException;
import retrofit.converter.Converter;

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Android REST Controller with Cache-Control

Android REST Controller with Simple Cache Control Headers using Retrofit 1.9.0 + OkHttp 2.2.0

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   public static Picasso getImageLoader(Context ctx) {
        if(sPicassoInstance == null) {
            Picasso.Builder builder = new Picasso.Builder(ctx);
            sTransformRequest = new Picasso.RequestTransformer() {
                @Override
                public Request transformRequest(Request request) {

                    Uri uri = request.uri;
                    if(uri.getScheme().startsWith("http")) {
                        String urlString = uri.toString();

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@TargetApi(Build.VERSION_CODES.KITKAT) 
static class DocumentExifTransformation implements Transformation {
    private static final String[] CONTENT_ORIENTATION = new String[] {
        MediaStore.Images.ImageColumns.ORIENTATION
    };

    final Context context;
    final Uri uri;

    DocumentExifTransformation(Context context, Uri uri) {

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function dex-method-count() {
  cat $1 | head -c 92 | tail -c 4 | hexdump -e '1/4 "%d\n"'
}
function dex-method-count-by-package() {
  dir=$(mktemp -d -t dex)
  baksmali $1 -o $dir
  for pkg in `find $dir/* -type d`; do
    smali $pkg -o $pkg/classes.dex
    count=$(dex-method-count $pkg/classes.dex)
    name=$(echo ${pkg:(${#dir} + 1)} | tr '/' '.')

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@interface NBNet()
@property(nonatomic, strong) NSURLSession *imageSession;
@property(nonatomic, strong) NSOperationQueue *netOperationQueue;
@end 

@implementation NBNet

+ (id)sharedNBNet {
    static NBNet *sharedNBNet = nil;
    static dispatch_once_t onceToken;

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// Playground - noun: a place where people can play

import UIKit

class ViewController: UIViewController ,UITableViewDelegate, UITableViewDataSource
{
    var tableView: UITableView!
    var items: NSMutableArray!
    override func viewDidLoad() {
        super.viewDidLoad()