IanColdwater

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jstart

LAContext *myContext = [[LAContext alloc] init];
NSError *authError = nil;
NSString *myLocalizedReasonString = @"Authenticate using your finger";
if ([myContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&authError]) {
   [myContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
                 localizedReason:myLocalizedReasonString
                           reply:^(BOOL success, NSError *error) {
                               if (success) {
                                   NSLog(@"User is authenticated successfully");
                               } else {

nicklockwood

Suppose we want to add support for a new iOS 8 API in our framework that replaces an older iOS 7 API. There are a few problems we might face:

1. The new API will crash if we call it on iOS 7
2. The new API won't compile if we build it using the iOS 7 SDK
3. The old API will raise a deprecation warning if built with a deployment target of iOS 8 and up

These three problems require three different technical solutions:

1. We can avoid calling the new API on an old OS version by using runtime detection (e.g. respondsToSelector:)
2. We can avoid compiling new APIs on old SDKs using the __IPHONE_OS_VERSION_MAX_ALLOWED macro

kongtomorrow

/* The Y combinator in Swift!

For a discussion of what the heck this is all about, see http://www.ece.uc.edu/~franco/C511/html/Scheme/ycomb.html

The nifty thing is that it allows us to implement recursion without the ability for a function to refer to itself from within its own definition. 

Note how we manage a recursive definition of factorial without any function referring to its own name.

Thanks to @eridius for help with the SelfToUnderlying<T> type.
*/

d2burke

//
//  MKMapView+ZoomLevel.h
//
//  Created by Daniel.Burke on 7/3/14 via Nikita Galayko @ StackOverflow
//  Copyright (c) 2014 Forrent.com. All rights reserved.
//

#import <Foundation/Foundation.h>
#define MERCATOR_RADIUS 85445659.44705395
#define MAX_GOOGLE_LEVELS 20

ghvillasboas

WWDC 2014 - Talks by Evangelists
============================================================

============================================================
Jake Behrens - App Frameworks Evangelists
behrens@apple.com/Twitter: @Behrens
============================================================
  - A Look Inside Presentation Controllers
  - Accessibility on iOS
  - Accessibility on OS X

steipete

// NSFormattingContext is new in iOS 8. For NSFormattingContextDynamic it promises is following:

// The capitalization context is determined dynamically from the set {NSFormattingContextStandalone, NSFormattingContextBeginningOfSentence, NSFormattingContextMiddleOfSentence}. For example, if a date is placed at the beginning of a sentence, NSFormattingContextBeginningOfSentence is used to format the string automatically. When this context is used, the formatter will return a string proxy that works like a normal string in most cases. After returning from the formatter, the string in the string proxy is formatted by using NSFormattingContextUnknown. When the string proxy is used in stringWithFormat:, we can determine where the %@ is and then set the context accordingly. With the new context, the string in the string proxy will be formatted again and be put into the final string returned from stringWithFormat:.

// Here's a simple example:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFor

calebd

extension Array {
    
    func first() -> Element? {
        if isEmpty {
            return nil
        }
        return self[0]
    }
    
    func last() -> Element? {

steipete

command alias reveal_load_sim expr (void*)dlopen("/Applications/Reveal.app/Contents/SharedSupport/iOS-Libraries/libReveal.dylib", 0x2);
command alias reveal_load_dev expr (void*)dlopen((const char *)[(NSString*)[(NSBundle*)[NSBundle mainBundle] pathForResource:@"libReveal" ofType:@"dylib"] cStringUsingEncoding:0x4], 0x2);
command alias reveal_start expr (void)[(NSNotificationCenter*)[NSNotificationCenter defaultCenter] postNotificationName:@"IBARevealRequestStart" object:nil];
command alias reveal_stop expr (void)[(NSNotificationCenter*)[NSNotificationCenter defaultCenter] postNotificationName:@"IBARevealRequestStop" object:nil];

command alias reveal expr (void*)dlopen("/Applications/Reveal.app/Contents/SharedSupport/iOS-Libraries/libReveal.dylib", 0x2), (void)[(NSNotificationCenter*)[NSNotificationCenter defaultCenter] postNotificationName:@"IBARevealRequestStart" object:nil];

justin

#import <objc/objc-runtime.h>
#import "UIView+SGAutoLayoutExtensions.h"

@implementation UIView (SGAutoLayoutExtensions)

#ifdef DEBUG

- (NSString *)nsli_description 
{
    return [self restorationIdentifier] ?: [NSString stringWithFormat:@"%@:%p", [self class], self];