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NSLocale *locale = [NSLocale currentLocale];
// [locale localeIdentifier]  fr_FR (i'm in france)
NSLog(@"current locale: %@", locale.localeIdentifier);

NSArray* preferredLanguages = [NSLocale preferredLanguages];
NSLog(@"preferredLanguages: %@", preferredLanguages);
// en,fr ( the interface is in english )
  
NSString* code = [locale objectForKey:NSLocaleCurrencyCode];

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[self addChildViewController:vc];
// [vc willMoveToParentViewController:self] called automatically
[self.view addSubview:vc.view]; // or something like this.
[vc didMoveToParentViewController:self];
// For removing view controllers:

[vc willMoveToParentViewController:nil];
[vc.view removeFromSuperview]; // or something like this
[vc removeFromParentViewController];

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  self.tableView.estimatedRowHeight = 44.0;
  self.tableView.rowHeight = UITableViewAutomaticDimension;
// 
  cell.textLabel.numberOfLines = 0;

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//http://ronnqvi.st/array-intersections-and-differences

NSPredicate *intersectPredicate = 
    [NSPredicate predicateWithFormat:@"SELF IN %@", otherArray];
NSArray *intersect = 
    [firstArray filteredArrayUsingPredicate:intersectPredicate];

NSPredicate *relativeComplementPredicate =  // a minus b
    [NSPredicate predicateWithFormat:@"NOT SELF IN %@", otherArray];
NSArray *relativeComplement = 

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="7531" systemVersion="14D131" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
    <dependencies>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7520"/>
    </dependencies>
    <customFonts key="customFonts">
        <mutableArray key="FreightSansPro-Book.otf">
            <string>FreightSansProBook-Regular</string>
        </mutableArray>
    </customFonts>

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#!/bin/sh

# Script for managing build and version numbers using git and agvtool.

# Change log:
# v1.0 18-Jul-11 First public release.
# v1.1 29-Sep-12 Launch git, agvtool via xcrun.


version() {

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git show-ref --tags
git format-patch -n --stdout sha >file
git am file

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The ' ## ' preprocessing operator performs token pasting.
#define macro(x) ## x \\gets replaced by the value of x 

Stringification # x makes x in to a string so @#x in objective-c

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- (void)outputStreamToFileAtPathDemo
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *file = [documentsDirectory stringByAppendingPathComponent:@"foo.dat"];
    NSLog(@"file: %@", file);
    
    NSOutputStream *output = [NSOutputStream outputStreamToFileAtPath:file append:NO];
    [output open];
    

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no separators for empty cells
tableView.tableFooterView = UIView(frame: CGRectZero)

//http://stackoverflow.com/questions/25770119/ios-8-uitableview-separator-inset-0-not-working

// From End To end
    cell.separatorInset =  UIEdgeInsetsZero;
    cell.layoutMargins = UIEdgeInsetsZero;
    cell.preservesSuperviewLayoutMargins = NO;
// invisible