nsforge’s gists

nsforge / gist:73fa1d9c77808440a7a7

Last active December 17, 2015 05:13

Lack of warnings on [[self alloc] init] type errors

	@interface MyClass : NSObject

	@end


	@implementation MyClass

	+ (void)myMethod
	{
	NSArray *x = [[self alloc] init]; // This _doesn't_ throw a warning, despite +alloc and -init both being declared as instancetype

nsforge / gist:bba2fb28f9d745ff2c33

Created July 9, 2015 01:56

Related Object Lookup Pattern

	@interface Person

	// Derived from JSON
	@property (readonly) NSString *personID;
	@property (readonly) NSString *name;
	…

	@end

	////////////////////////////////////////

nsforge / gist:71623cb0138a8210cc1f

Last active August 29, 2015 14:21

Private designated initializers in Objective-C

	/*
	My goal here is to have an immutable model class with an initialiser that is hidden unless you import a private header ("Person+Private.h"). This is useful in the context of providing a library or framework where consuming code only ever has read-only access to instances of this class, and they are never supposed to create instances themselves.
	*/

	…

	//***********************************
	// Person.h
	//

nsforge / Warnings.xcconfig

Created February 26, 2015 04:39

Standard Xcode Warnings (for use in .xcconfig files)

	// Apple LLVM - Warnings - All languages
	GCC_WARN_CHECK_SWITCH_STATEMENTS = YES
	GCC_WARN_ABOUT_DEPRECATED_FUNCTIONS = YES
	CLANG_WARN_EMPTY_BODY = YES
	GCC_WARN_SHADOW = YES
	CLANG_WARN_CONSTANT_CONVERSION = YES
	GCC_WARN_64_TO_32_BIT_CONVERSION = YES
	CLANG_WARN_ENUM_CONVERSION = YES
	CLANG_WARN_INT_CONVERSION = YES
	GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES

nsforge / gist:bf7c3d3ed2aba458e21f

Created November 18, 2014 11:25

One-liner to delete your oldest Time Machine backup

sudo tmutil delete "`tmutil listbackups | sed -n 1p`"

nsforge / gist:8949790

Created February 12, 2014 03:51

Demonstration of uint64 accuracy bug in NSJSONSerialization

	NSString *jsonString = @"{\"myNumber\":1029742590268606522}";
	NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];

	NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:NULL];
	NSLog(@"jsonDict: %@", jsonDict);

	uint64_t myNumber = [jsonDict[@"myNumber"] unsignedLongLongValue];
	NSLog(@"myNumber: %llu", myNumber);

	/*

nsforge / gist:7743616

Created December 2, 2013 01:40

Example of why you shouldn't blindly throw away type information from the compiler when casting to a protocol

	- (void)someCallbackWithAViewController:(UIViewController *)viewController
	{
	if ([viewController conformsToProtocol:@protocol(CrazyViewController)])
	{
	UIViewController <CrazyViewController> crazyVC = (UIViewController <CrazyViewController> )viewController;
	if (crazyVC.presentedViewController == nil)
	{
	[crazyVC showCrazyModalView];
	}
	else

nsforge / gist:6861644

Created October 7, 2013 02:17

Things I've added to my .bash_profile to get C code compiling nicely with libraries installed via Homebrew

	# Homebrew path config
	export PATH="$PATH:/usr/local/bin:/usr/local/sbin"
	export LIBRARY_PATH="$LIBRARY_PATH:/usr/local/lib"
	export CPATH="$CPATH:/usr/local/include"

nsforge / gist:6861400

Created October 7, 2013 01:42

Getting RubyCocoa to work in ruby scripts running on OS X 10.9 Mavericks

nsforge / gist:6805167

Last active December 24, 2015 13:29

KVC Helper Macros

	// KVC Compile-time Helpers
	//
	// These macros allow simple compile-time checking of KVC keypaths, as long as the getter methods for properties
	// match up with their property names (i.e. if the property 'available' has the getter method 'isAvailable', these
	// macros will break)

	#define Key(class, key) (0 ? ((class )nil).key, (NSString )nil : @#key)
	#define InstanceKey(instance, key) (0 ? ((__typeof(instance))nil).key, (NSString *)nil : @#key)
	#define SelfKey(key) (0 ? ((__typeof(self))nil).key, (NSString *)nil : @#key)
	#define ProtocolKey(protocol, key) (0 ? ((id <protocol>)nil).key, (NSString *)nil : @#key)

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