joshavant

##XXAppDelegate.m, XXSomeView.m, some other object, etc##

...
[[XXSomeSingletonController sharedInstance] doThatThing];
...

##XXSomeSingletonControllerObserver.h##

@protocol XXSomeSingletonControllerObserver 

joshavant

#import "Foo.h"

static dispatch_once_t FooSharedDispatchOnceToken;
static Foo *FooSharedInstance;

+ (void)prepareService
{
    [self fetchSharedServiceAndInitialize:YES];
}

joshavant

static void *kFOOClassKVOContext = &kFOOClassKVOContext;

@implementation FOOClass

- (void)addKVOObservers
{
    [self.property addObserver:self forKeyPath:@"someKeyPath" options:0 context:kFOOClassKVOContext];
}

- (void)removeKVOObservers

joshavant

Copyright (c) <year> Josh Avant

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

joshavant

The recommended way to keep a long-term reference to a particular record is to store the first and last name, or a hash of the first and last name, in addition to the identifier. When you look up a record by ID, compare the record’s name to your stored name. If they don’t match, use the stored name to find the record, and store the new ID for the record.

-from Address Book Programming Guide for iOS, Using Record Identifiers, 2nd paragraph

joshavant

// requires UICKeyChainStore lib

NSString *uniqueIdentifier;

#if TARGET_IPHONE_SIMULATOR
    uniqueIdentifier = @"SIMULATOR";
#else
    uniqueIdentifier = [UICKeyChainStore stringForKey:@"UUID" service:@"joshavant"];

    if(![uniqueIdentifier length] > 0)

joshavant

    func alertControllerToSelectContactMethod() -> UIAlertController {
        let controller = UIAlertController(title: "How do you want to contact \(firstName.value)?", message: "", preferredStyle: .ActionSheet)
        
        let methodsAndHandlers = contactMethodsAndHandlers()
        
        if (methodsAndHandlers.count == 0) {
            let action = UIAlertAction(title: NSLocalizedString("No Contact Info Found", comment: ""), style: .Default, handler: nil)
            action.enabled = false
            
            controller.addAction(action)

joshavant

Translucent Bar Bliss: Scroll View Insetting w/ Nav + Tab Bars, in an IB Workflow

This document describes how to configure your scroll views in IB, so that their insets are configured to accomodate coverage by UINavigationBar and UITabBar.

A common reason for wanting this is to allow these views to configured as 'translucent', while scroll view content scrolls beneath them.

This guide is broken up into two types of view configurations...

• Configuration 1: A top-level scroll view, which fills UIViewController's view
• Configuration 2: A top-level scroll view, which does not fill UIViewController's view

joshavant

import Foundation

protocol Pageable {
    typealias PagedContentType
    
    var pageLimit: Int { get set }
    var pageOffset: Int { get set }
    
    func getPage(limit limit: Int, offset: Int, completion: (result: [PagedContentType]?, error: NSError?) -> Void)
    mutating func nextPage(completion: (result: [PagedContentType]?, error: NSError?) -> Void)

joshavant

// Broken on 9.2, Worked on 9.1
let keysToFetch = [CNContactGivenNameKey, CNContactFamilyNameKey, CNContactPhoneNumbersKey, CNContactEmailAddressesKey]

// Works on 9.2 + 9.1
let keysToFetch = [CNContactPhoneNumbersKey, CNContactEmailAddressesKey, CNContactFormatter.descriptorForRequiredKeysForStyle(.FullName)]