myell0w’s gists

steipete / gist:4233987

Created December 7, 2012 15:32

Print a CGPath

	extern void CGPathPrint(CGPathRef path, FILE* file);


	CGPathPrint(path.CGPath, NULL);

	Path 0xb44e380:
	moveto (-12, 295)
	lineto (115, 295)
	lineto (108, -12)
	lineto (235, -12)

krzysztofzablocki / gist:4396302

Last active November 24, 2021 19:17

Set symbol breakpoint on objc_msgSend then setup this debug command to log all methods called in iOS Simulator. If you want to do device debugging change esp+4 register to r0, esp+8 to r1 Found long ago somewhere on stackoverflow.

expr -- (void)printf("[%s, %s]\n",(char *) object_getClassName(*(long*)($esp+4)), (char *) *(long *)($esp+8) )

drance / gist:4546014

Created January 16, 2013 09:57

Workaround to vanilla UICollectionView+UICollectionViewFlowLayout using non-integral origins, leading to blurry cells.

	@implementation BHSCollectionViewFlowLayout

	- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect {
	NSArray *allAttrs = [super layoutAttributesForElementsInRect:rect];
	for (UICollectionViewLayoutAttributes *attributes in allAttrs) {
	attributes.frame = CGRectIntegral(attributes.frame);
	}
	return allAttrs;
	}

mbigatti / BMXRubberBanding.h

Last active December 11, 2015 07:08

iOS6 Rubber-banding Formula, as described by Grant Paul (chpwn) (ref. https://twitter.com/chpwn/status/285540192096497664)

	//
	// BMXRubberBanding.h
	// Rubber-banding Formula, as described by Grant Paul (chpwn)
	// https://twitter.com/chpwn/status/285540192096497664
	//

	#ifndef TimerApp_BMXRubberBanding_h
	#define TimerApp_BMXRubberBanding_h

	#define BMX_RUBBER_BANDING_CONSTANT 0.55

jverkoey / UIView Layout

Last active May 16, 2020 02:51

Layout + size calculations for iOS.

	- (CGSize)sizeOfContentsWithSize:(CGSize)size
	shouldLayout:(BOOL)shouldLayout {
	// Calculate frames.

	if (shouldLayout) {
	// Update frames.
	}

	return // size
	}

steipete / PSPDFViewController.h

Last active June 6, 2017 03:56

This method will help to prevent a lot of emails about "weird bugs".

	// Defines a yet undocumented method to add a warning if super isn't called.
	#ifndef NS_REQUIRES_SUPER
	#if __has_attribute(objc_requires_super)
	#define NS_REQUIRES_SUPER __attribute((objc_requires_super))
	#else
	#define NS_REQUIRES_SUPER
	#endif
	#endif

	@interface UIViewController (SubclassingWarnings)

steipete / PSPDFUIKitMainThreadGuard.m

Last active May 27, 2024 12:11

This is a guard that tracks down UIKit access on threads other than main. This snippet is taken from the commercial iOS PDF framework http://pspdfkit.com, but relicensed under MIT. Works because a lot of calls internally call setNeedsDisplay or setNeedsLayout. Won't catch everything, but it's very lightweight and usually does the job.You might n…

	// Taken from the commercial iOS PDF framework http://pspdfkit.com.
	// Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved.
	// Licensed under MIT (http://opensource.org/licenses/MIT)
	//
	// You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it.

	// PLEASE DUPE rdar://27192338 (https://openradar.appspot.com/27192338) if you would like to see this in UIKit.

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

JaviSoto / gist:5906004

Last active June 27, 2023 10:25

Mark designated initializer at compile time

	#define MSDesignatedInitializer(__SEL__) __attribute__((unavailable("Invoke the designated initializer `" # __SEL__ "` instead.")))

	// Sample usage:

	- (instancetype)initWithObject:(id)object;
	- (instancetype)init MSDesignatedInitializer(initWithObject:); // <- This even gets auto-complete.

	// Now calling init on this class would throw a warning.

krzysztofzablocki / Asserts

Created July 3, 2013 18:52

My take on assertions, code sample accompanying blog post at http://merowing.info/2013/07/expanded-use-of-asserts/

	typedef NS_ENUM(NSInteger, kErrorCode) {
	kErrorCodeInternal = 431432,
	};

	//! generate error and log it.
	extern NSError pixle_NSErrorMake(NSString message, NSUInteger code, NSDictionary *aUserInfo, SEL selector);

	#define AssertTrueOrReturnBlock(condition, block) do{ NSAssert((condition), @"Invalid condition not satisfying: %s", #condition);\
	if(!(condition)) { block(pixle_NSErrorMake([NSString stringWithFormat:@"Invalid condition not satisfying: %s", #condition], kErrorCodeInternal, nil, _cmd)); return;} }while(0)

jaybaird / gist:6003951

Last active December 19, 2015 19:09

Binary Tree with NSArray

	#import <Foundation/Foundation.h>

	@interface Node : NSObject
	@property (nonatomic) NSInteger identifier;
	@property (nonatomic, copy) NSString *value;
	+ (Node )nodeWithIdentifier:(NSInteger)identifier value:(NSString )value;
	@end

	@implementation Node
	+ (Node )nodeWithIdentifier:(NSInteger)identifier value:(NSString )value {

Matthias Tretter myell0w