numist

static BOOL (^imagesDifferByCGDataProviderComparison)(CGImageRef, CGImageRef) = ^(CGImageRef a, CGImageRef b) {
    BOOL result = NO;
    
    CGDataProviderRef aDataProvider = CGImageGetDataProvider(a);
    CGDataProviderRef bDataProvider = CGImageGetDataProvider(b);

    // It turns out that the CGDataProvider's pages are set copy-on-write, so these calls are not nearly as expensive as you think.
    CFDataRef aData = CGDataProviderCopyData(aDataProvider);
    CFDataRef bData = CGDataProviderCopyData(bDataProvider);
    

numist

NSMutableData *dataObj = [NSMutableData dataWithLength:length];
objc_setAssociatedObject(self, key, dataObj, OBJC_ASSOCIATION_RETAIN);
void *data = [dataObj mutableBytes];

numist

// Example ignores concurrency protection on internalRefCount for brevity.
// Not compatible with ARC, for obvious reasons (but could be implemented in part with a non-ARC category?).
@interface Foo ()

@property (nonatomic, assign) NSUInteger internalRefCount;

@end


@implementation Foo

numist

//
//  NSCoder+NNSecureRectCoding.h
//  Switch
//
//  Created by Scott Perry on 07/06/13.
//  Copyright © 2013 Scott Perry.
//
//  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 all copies or substantial portions of the Software.

numist

//
// NNMainThreadGuard.m
//
// Mostly taken from the commercial iOS PDF framework http://pspdfkit.com and Switch https://github.com/numist/Switch.
// Copyright © 2013 Peter Steinberger and Scott Perry. All rights reserved.
//
// 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 all copies or substantial portions of the Software.
//

numist

// Built for ARC, remove the __bridge and it should work in MRC as well.
void *NNCFAutorelease(CFTypeRef cfObject)
{
    if (cfObject) {
        static Class arp = Nil;
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            arp = NSClassFromString(@"NSAutoreleasePool");
            Assert(arp);
        });

numist

#import <objc/runtime.h>
#import <stdlib.h>

// declare some of the Objective-C runtime's private parts where we can see them
typedef struct _NXMapTable NXMapTable;
extern NXMapTable *gdb_objc_realized_classes;
extern void *NXMapInsert(NXMapTable *table, const void *key, const void *value);

@implementation NSObject (Poser)

numist

#import "memoize.h"

@implementation Example

- (id)null;
{
    return NNMemoize(^{
        sleep(1);
        return [NSNull null];
    });

numist

/**
 Provides the ability to verify key paths at compile time.
 
 If "keyPath" does not exist, a compile-time error will be generated.
 
 Example:
    // Verifies "isFinished" exists on "operation".
    NSString *key = SQKeyPath(operation, isFinished);
 
    // Verifies "isFinished" exists on self.

numist

#import <UIKit/UIKit.h>

@protocol NNApplicationSubscriber <NSObject>
@optional

- (void)applicationDidBecomeActive:(UIApplication *)application;
- (void)application:(UIApplication *)application didChangeStatusBarFrame:(CGRect)oldStatusBarFrame;
- (void)application:(UIApplication *)application didChangeStatusBarOrientation:(UIInterfaceOrientation)oldStatusBarOrientation;
- (void)applicationDidEnterBackground:(UIApplication *)application;
- (void)applicationDidFinishLaunching:(UIApplication *)application;