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`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):

What's the difference between UUID, GUID and UDID?

UUID (Universally Unique Identifier): A sequence of 128 bits that can guarantee uniqueness across space and time, defined by [RFC 4122][rfc4122].
GUID (Globally Unique Identifier): Microsoft's implementation of the UUID specification; often used interchangeably with UUID.
UDID _(Unique Device Identifier)): A sequence of 40 hexadecimal characters that uniquely identify an iOS device (the device's Social Security Number, if you will). This value can be retrieved through iTunes, or found using UIDevice -uniqueIdentifier. Derived from hardware details like MAC address.

Is UDID deprecated?

Backend Architectures

ARCHITECTURES

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OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

	// 1. Go to page https://www.linkedin.com/settings/email-frequency
	// 2. You may need to login
	// 3. Open JS console
	// ([How to?](http://webmasters.stackexchange.com/questions/8525/how-to-open-the-javascript-console-in-different-browsers))
	// 4. Copy the following code in and execute
	// 5. No more emails
	//
	// Bookmarklet version:
	// http://chengyin.github.io/linkedin-unsubscribed/

	// Taken from http://PSPDFKit.com. This snippet is under public domain.
	#define UIKitVersionNumber_iOS_7_0 0xB57
	BOOL PSPDFIsUIKitFlatMode(void) {
	static BOOL isUIKitFlatMode = NO;
	static dispatch_once_t onceToken;
	dispatch_once(&onceToken, ^{
	// We get the modern UIKit if system is running >= iOS 7 and we were linked with >= SDK 7.
	if (kCFCoreFoundationVersionNumber >= kCFCoreFoundationVersionNumber_iOS_7_0) {
	isUIKitFlatMode = (NSVersionOfLinkTimeLibrary("UIKit") >> 16) >= UIKitVersionNumber_iOS_7_0;
	}

	// Taken from the commercial iOS PDF framework http://pspdfkit.com.
	// Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved.
	// Licensed under MIT (http://opensource.org/licenses/MIT)
	//
	// You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it.

	// PLEASE DUPE rdar://27192338 (https://openradar.appspot.com/27192338) if you would like to see this in UIKit.

	#import <objc/runtime.h>
	#import <objc/message.h>

	---
	language: objective-c
	before_script:
	- ./scripts/travis/add-key.sh
	after_script:
	- ./scripts/travis/remove-key.sh
	after_success:
	- ./scripts/travis/testflight.sh
	env:
	global:

	@implementation NSURLRequest (printCurlRequest)

	-(NSString *)curlRequest
	{
	__block NSString *curlstr = [NSString stringWithFormat:@"curl -k -X %@ --dump-header -",self.HTTPMethod];

	[[self allHTTPHeaderFields] enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
	curlstr = [curlstr stringByAppendingFormat:@" -H \"%@: %@\"",key, obj];
	}];