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| Context不保存，NSManagedObject都不释放 | |
| NSManagedObject没有循环引用，只要Context保存，就释放 | |
| NSManagedObject存在循环引用，必须Context reset，才会释放 | |
| 可以写个test case |
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| // | |
| // main.swift | |
| // CheckBRD | |
| // | |
| // Created by Yanni Wang on 11/10/19. | |
| // Copyright © 2019 Yanni. All rights reserved. | |
| // | |
| import Foundation |
623637646
/ ThreadNotSafetyTests.m
Last active
May 13, 2020 16:49
iOS multiple threads is not safety with nonatomic properties.
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| #import <XCTest/XCTest.h> | |
| @interface ThreadNotSafetyTests : XCTestCase | |
| // no crash | |
| //@property (atomic) NSObject *obj; | |
| // crash | |
| @property (nonatomic) NSObject *obj; | |
| @end |
623637646
/ DoubleFloat+Deprecated.swift
Created
September 5, 2019 08:28
Discard + - * / for Double and Float
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| import Foundation | |
| // Double | |
| func + (leftAddend: Double, rightAddend: Double) -> Double { | |
| fatalError() | |
| } | |
| func - (leftAddend: Double, rightAddend: Double) -> Double { | |
| fatalError() | |
| } |
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
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| @interface MyObject : NSObject | |
| @property NSString *name; | |
| @end | |
| @implementation MyObject | |
| -(void)dealloc | |
| { | |
| NSLog(@"dealloc"); | |
| } | |
| @end |
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
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| 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"); | |
| }]; |
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| - (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); |
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| <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
/ iOS push notification logic.txt
Last active
April 24, 2019 02:54
iOS push notification logic
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| # 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: |
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| #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;\ |