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// http://cocoawithlove.com/2009/10/ugly-side-of-blocks-explicit.html has a nice breakdown of the syntax--it helps to think of the ^ as similar to a pointer dereference symbol *

// block typedef:

    typedef void(^Block)();
    typedef void(^ConditionalBlock)(BOOL);
    typedef NSString*(^BlockThatReturnsString)();
    typedef NSString*(^ConditionalBlockThatReturnsString)(BOOL);

// block property with typedef:

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# /bin/bash 

#Usage: $ ./cs_xproj_validate.sh path/to/xcode/project/file/theproject.xcodeproj
#More info: http://stackoverflow.com/q/13962341/89035

PROJECT_FILE="$1/project.pbxproj"

PREVIOUS_LINE=-1

for LINE in `cat "$PROJECT_FILE" | grep -n CODE_SIGN_IDENTITY | grep -o -E '^([0-9]*)'`

sendoa

#define MSDesignatedInitializer(__SEL__) __attribute__((unavailable("Invoke the designated initializer `" # __SEL__ "` instead.")))

// Sample usage:

- (id)initWithObject:(id)object;
- (id)init MSDesignatedInitializer(initWithObject:); // <- This even gets auto-complete.

// Now calling init on this class would throw a warning.

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sys_rb_usr=/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr
sdk_rb_usr=`xcode-select -p`/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr
sudo cp -r $sdk_rb_usr/include $sys_rb_usr/include

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#!/bin/sh
# Create a RAM disk with same perms as mountpoint
# Script based on http://itux.idev.pro/2012/04/iservice-speed-up-your-xcode-%D0%BD%D0%B5%D0%BA%D0%BE%D1%82%D0%BE%D1%80%D1%8B%D0%B5-%D1%81%D0%BF%D0%BE%D1%81%D0%BE%D0%B1%D1%8B/ with some additions
# Usage: sudo ./xcode_ramdisk.sh start

USERNAME=$(logname)

TMP_DIR="/private/tmp"
RUN_DIR="/var/run"
SYS_CACHES_DIR="/Library/Caches"

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- (IBAction)handleTap:(id)sender
{
   BOOL isHiding = !_statusBarHidden;
   _statusBarHidden = isHiding;
   
   [UIView animateWithDuration:UINavigationControllerHideShowBarDuration delay:0 options:0
                    animations:^{
                       [self setNeedsStatusBarAppearanceUpdate];
                    }
                    completion:NULL];

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#import <Foundation/Foundation.h>

// typedef
typedef NSString*(^ConvertBlock)(NSString *text);

@interface Thing : NSObject
@property (nonatomic, strong) void (^coolPropertyBlock)(NSString *text); // Property

// method param
- (void)doSomething:(void(^)(NSString *text))block with:(NSString *)person;

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//
//  BinaryDataScanner.m
//
//  Copyright 2009 Dave Peck <davepeck [at] davepeck [dot] org>. All rights reserved.
//  http://davepeck.org/
//
//  This class makes it quite a bit easier to read sequential binary files in Objective-C.
//
//  This code is released under the BSD license. If you use it in your product, please
//  let me know and, if possible, please put me in your credits.

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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):

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func measure(prefix: String = "Time Taken", closure:()->()) {
  let a = CFAbsoluteTimeGetCurrent()
  closure()
  let b = CFAbsoluteTimeGetCurrent()
  let m = ((b-a) * 1000.0)
  print("\(prefix): \(m) ms")
}