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Keep Track of Your Files’ SCM Status
You can keep track of your files’ SCM status in the project navigator. SCM status is shown as a badge next to the file name  as follows:

Badge  SCM status
M      Locally modified

U      Updated in repository

A      Locally added

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//To initialize a view controller with a nib file you use initWithNibName.

UIViewController *viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];

//Using Storyboard instead of nib files, use the UIStoryboard class 

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MyStoryboard" bundle:nil];

UIViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"ViewController"];

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//Go to the directory containing your project.

cd <directory of your Xcode project>

//If you already have a local git project, skip the steps below
git init .
git add .
git commit -s <type in a commit message>

//Push into your repository.  --Push an existing repository from the command line

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Useful iOS Project structure

A simple folder structure:
AppDelegate
Controllers
Models
Helpers

Folder Structure  for a complex app

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#include <stdlib.h>

int r = arc4random() % 74;

arc4random_uniform(74)

//Use the arc4random_uniform(upper_bound) function to generate a random number within a range. 

//The following will generate a number between 0 and 73 inclusive.
arc4random_uniform(74)

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//This will check a UITextField for a proper email and phone number of 10 digits or less.
//Add this method to the textFields delegate then check if the characters it is about to change should be added or not.
//Return YES or NO depending on the text field, how many characters are currently in it, and what characters it wants to add:

#define ALPHA                   @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
#define NUMERIC                 @"1234567890"
#define ALPHA_NUMERIC           ALPHA NUMERIC

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    NSCharacterSet *unacceptedInput = nil;

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NSDateFormatter *formatter;
NSString        *dateString;

formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"dd-MM-yyyy HH:mm"];

dateString = [formatter stringFromDate:[NSDate date]];

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To avoid always entering your login credentials and generating SSH keys, you'll want to install the credential helper so your passwords are cached. On OS X, you'll need to handle this through the Terminal. To start, use this command to download the credential helper:

//Get the helper
curl -s -O \
http://github-media-downloads.s3.amazonaws.com/osx/git-credential-osxkeychain

//change permissions
chmod u+x git-credential-osxkeychain

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Master-Detail App Template 
=====================
A Master-Detail App Template from Xcode

Overview
--------
- version: 0.1.0


Description

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Markup reference 
https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet

Github Help
https://help.github.com/