dhoerl

/*
     File: KeychainItemWrapper.h
 Abstract: 
 Objective-C wrapper for accessing a single keychain item.
 
  Version: 1.2 - ARCified
 
 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple
 Inc. ("Apple") in consideration of your agreement to the following
 terms, and your use, installation, modification or redistribution of

dhoerl

//
//  Asymmetric.swift
//
//  Created by David Hoerl on 12/23/18.
//  Copyright © 2018 David Hoerl. All rights reserved.
//

/*
  This is the portion you need in the distributed app, which uses the public key that can appear in plain text
*/

dhoerl

static NSString *kcIdentifier = @"MyApp";

@implementation LTAppDelegate (KeyChain)

- (void)keychainInit
{
	self.keychainDict = [NSMutableDictionary dictionaryWithCapacity:7];
	KeychainItemWrapper *item = [[KeychainItemWrapper alloc] initWithIdentifier:kcIdentifier accessGroup:nil];
	
	[self.keychainDict setObject:@"" forKey:kcEmailAddress];

dhoerl

- (uint64_t)freeDiskspace
{
	uint64_t totalFreeSpace = 0;

	__autoreleasing NSError *error = nil;  
	NSString *path = [self applicationDocumentsDirectory];  
	NSDictionary *dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath:path error: &error];  

	if (dictionary) {  
		NSNumber *freeFileSystemSizeInBytes = [dictionary objectForKey:NSFileSystemFreeSize];

dhoerl

Prefer printf to the C++ iosstream methods? Now you can create a string using printf style format strings, and also append formatted string to existing strings.

Inspired by: http://stackoverflow.com/questions/2342162

dhoerl

David's Top 10: Do That When Writing Swift

1) Purchase Dash (OS X and iOS) and get Swift from SwiftDoc.org (invaluable reference, I use it daily!)

2) Use Enums for UIView tags and SegmentedControl segments;

   enum MyViews: Int { case OKButton=1...} then switch MyViews(rawValue: view.tag)
   
 also for states (somewhat replaces C's X-Macros, helps during debugging)
 

dhoerl

When I posted this on Apple’s Cocoadev listserver, I never did get pointers to code to convert a NSDictionary to a binary formatted plist, but did get pointers to look at NSPropertyListSerialization - something I had already (mis)read a few times.

The description for the dataFromPropertyList class method seems confusing if you don't understand that you can create a property list with no keys: that is, you can create one with a single compliant object, and the key becomes "root".

So, in the unlikely event that some else someday has the same mental block, here is actual tested code that takes a NSDictionary and creates a binary plist file:

   NSDictionary *dict;
    char *payload = "This is the payload";
    
    dict = [NSDictionary dictionaryWithObjectsAndKeys:

dhoerl

#if ! __has_feature(objc_arc)
#error THIS CODE MUST BE COMPILED WITH ARC ENABLED!
#endif
 
static CFArrayRef certs;

@implementation MyWebFetcher

+ (void)initialize
{

dhoerl

/*
 
 File: Reachability.h
 Abstract: Basic demonstration of how to use the SystemConfiguration Reachablity APIs.
 
 Version: 2.2 - ARCified
 
 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Inc.
 ("Apple") in consideration of your agreement to the following terms, and your
 use, installation, modification or redistribution of this Apple software

dhoerl

Reloading the NIB is expensive. Better to load it once, then instantiate the objects when you need a cell. Note that you can add UIImageViews etc to the nib, even multiple cells, using this method (Apple's "registerNIB" iOS5 allows only one top level object - one UITableViewCell. Bug 10580062 "iOS5 tableView registerNib: overly restrictive"

So my code is below - you read in the NIB once (in +initialize like I did or in viewDidload - whatever. From then on, you instantiate the nib into objects then pick the one you need. This is much more efficient than loading the nib over and over.