623637646’s gists

623637646 / Singleton.h

Last active April 11, 2019 03:48

iOS Objective-C Singleton with Macro!!!

	#define MACRO_SINGLETON_H \
	+ (instancetype)sharedInstance;\
	- (instancetype)init NS_UNAVAILABLE;\
	+ (instancetype)new NS_UNAVAILABLE;\
	+ (instancetype)allocWithZone:(struct _NSZone *)zone NS_UNAVAILABLE;\
	- (id)copy NS_UNAVAILABLE;\
	- (id)mutableCopy NS_UNAVAILABLE;\
	+ (id)copyWithZone:(struct _NSZone *)zone NS_UNAVAILABLE;\
	+ (id)mutableCopyWithZone:(struct _NSZone *)zone NS_UNAVAILABLE;\

623637646 / 动态库静态库tips

Last active February 19, 2024 07:36

动态库静态库tips

	1. 静态库
	只编译不链接
	只要头文件在，无需设置依赖
	会打包进主工程二进制文件
	2. 动态库
	既编译又链接
	必须设置依赖
	不会打包进主工程二进制文件
	3. 当且仅当动态库依赖静态库时，才会copy静态库的代码到动态库二进制

623637646 / UIImageWithName

Last active November 28, 2018 08:32

Get UIImage by name in framework

	#define UIImageWithName(IMAGE_NAME)\
	(^UIImage (NSString imageName){\
	NSAssert(imageName.length != 0, @"imageName is empty");\
	if (imageName.length == 0) {\
	return nil;\
	}\
	NSBundle *bundle = [NSBundle bundleWithPath:[[NSBundle bundleForClass:NSClassFromString(@"SHPUIModule")] pathForResource:@"SHPUIKit" ofType:@"bundle"]];\
	NSAssert(bundle != nil, @"bundle is nil");\
	if (bundle == nil) {\
	return nil;\

623637646 / iOS push notification logic.txt

Last active April 24, 2019 02:54

iOS push notification logic

	# iOS 10 or above

	1. Cold start
	1. normal notification
	userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler:
	2. silent notification
	userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler:
	2. Hot start
	1. normal notification
	userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler:

623637646 / safari_memory_hole.html

Created March 14, 2019 08:53

Safari memory hole

	<html>

	<head>
	<title>Safari Memory Hole</title>
	</head>

	<body>
	<textarea>This file takes 30MB in Chrome but 2GB in Safari</textarea>
	<script>
	var m = {};

623637646 / Associated.m

Last active April 24, 2019 02:54

Objective C weak associated

	- (id)weakObject {
	id (^block)() = objc_getAssociatedObject(self, @selector(weakObject));
	return (block ? block() : nil);
	}

	- (void)setWeakObject:(id)object {
	id __weak weakObject = object;
	id (^block)() = ^{ return weakObject; };
	objc_setAssociatedObject(self, @selector(weakObject),
	block, OBJC_ASSOCIATION_COPY);

623637646 / ReactiveObjCBug

Last active May 28, 2020 11:57

ReactiveObjC 3.0.0 bug. when hook NSString dealloc method, NSString can't release. Updated: This is not ReactiveObjC bug. Refer to: https://stackoverflow.com/q/62064040/9315497

	int i = 0;
	while (YES) {
	@autoreleasepool {
	NSString *string = [[NSString alloc] initWithFormat:@"%d", i];
	// or
	// NSString *string = [[NSString alloc] init];

	[[string rac_willDeallocSignal] subscribeCompleted:^{
	NSLog(@"obj dealloc");
	}];

623637646 / AspectPositionInstead.m

Last active May 13, 2020 15:01

How to change the return value (for object) with Aspects's AspectPositionInstead. Refer to: https://www.jianshu.com/p/5ba69f35e034

	@interface MyObject : NSObject
	@property NSString *name;
	@end

	@implementation MyObject
	-(void)dealloc
	{
	NSLog(@"dealloc");
	}
	@end

623637646 / DoubleFloat+Deprecated.swift

Created September 5, 2019 08:28

Discard + - * / for Double and Float

	import Foundation

	// Double
	func + (leftAddend: Double, rightAddend: Double) -> Double {
	fatalError()
	}

	func - (leftAddend: Double, rightAddend: Double) -> Double {
	fatalError()
	}

623637646 / ThreadNotSafetyTests.m

Last active May 13, 2020 16:49

iOS multiple threads is not safety with nonatomic properties.

	#import <XCTest/XCTest.h>

	@interface ThreadNotSafetyTests : XCTestCase

	// no crash
	//@property (atomic) NSObject *obj;

	// crash
	@property (nonatomic) NSObject *obj;
	@end

Yanni Wang 623637646