init | 易学教程

Would it be correct/ellegant use only alloc without init?

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问题 If we don't want to implement init method in our class, and bearing in mind that init in NSObject only returns an instance of the object without initialization, I don't see the point of calling init if we already get the instance with alloc. I have tried and it works, but I am not sure it won't cause future problems. myClass *newObject = [myClass alloc]; instead of: myClass *newObject = [[myClass alloc] init]; Thanks a lot. 回答1: No, just calling alloc would not be correct. alloc zeroes out

中国空气质量在线监测分析平台之JS加密、JS混淆处理

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中国空气质量在线监测分析平台数据爬取分析页面分析：确定url、请求方式、请求参数、响应数据　　 1.访问网站首页： https://www.aqistudy.cn/html/city_detail.html ，通过抓包工具分析首页请求并没有获取到页面内的数据信息　　 2.因此可以确定页面内的数据是动态加载的，通过抓包工具捕获加密的响应对象，　　 3.加密响应对象是通过post请求携带加密的参数发起（2次）。　　 4.综上分析可以确定，动态请求时在搜索按钮触发时发起的，因此通过火狐firefox浏览器分析页面搜索按钮的绑定事件以及定位到具体的代码在哪一行。　　 5.通过标签绑定事件可以确定是触发了getData()函数，因此对应转包工具捕获到的两次请求，进入js代码，找到函数的执行过程。　　 6。在当前js中搜索找到getAQIData();和getWeatherData();函数，也没发现ajax发起的post请求，但都调用了getServerData函数，只是唯一一个参数不同method = 'GETDETAIL';method = 'GETCITYWEATHER';，因此继续分析getServerData函数。　　 7.在当前js中为找到getServerData 函数定义，切换到google浏览器对请求响应进行全局搜索，获取函数定义--- js反混淆。　　

How critical is dumb-init for Docker?

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问题 I hope that this question will not be marked as primarily opinion-based , but that there is an objective answer to it. I have read Introducing dumb-init, an init system for Docker containers, which extensively describes why and how to use dumb-init . To be honest, for someone not too experienced with how the Linux process structure works, this sounds pretty dramatic - and it feels as if you are doing things entirely wrong if you don't use dumb-init . This is why I'm thinking about using it

iOS loadNibNamed confusion, what is best practice?

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问题 I'm familiar with most of the process of creating an XIB for my own UIView subclass, but not everything is working properly for me - it's mostly to do with the IBOutlets linking up. I can get them to work in what seems like a roundabout way. My setup is this: I have MyClass.h and MyClass.m. They have IBOutlets for a UIView (called view) and a UILabel (called myLabel). I added the 'view' property because some examples online seemed to suggest that you need this, and it actually solved an issue

rspec --init not working/ `mkd ir': Invalid argument - ./C: (Errno::EINVAL)

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问题 I'm following codeschool's class on rspec. Installing worked fine. I made a file called rspec-zombie for the project. Fine. But when I tried rspec --init in powershell, I got an unholy error message. I'm under the impression there are supposed to be some files made inside the directory, which aren't there. It follows. C:\Users\Roman\The-Odin-Project\rspec-zombie> rspec --init create .rspec C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-support-3.1.0/lib/rspec/support/directory

Order of init calls in Kotlin Array initialization

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问题 In the constructor of an Array is there a guarantee that the init function will be called for the indexes in an increasing order? It would make sense but I did not find any such information in the docs: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/-init-.html#kotlin.Array%24%28kotlin.Int%2C+kotlin.Function1%28%28kotlin.Int%2C+kotlin.Array.T%29%29%29%2Finit 回答1: There is no guarantee for this in the API. TLDR: If you need the sequential execution, because you have some state that

module_init() vs. core_initcall() vs. early_initcall()

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问题 In drivers I often see these three types of init functions being used. module_init() core_initcall() early_initcall() Under what circumstances should I use them? Also, are there any other ways of init? 回答1: They determine the initialization order of built-in modules. Drivers will use device_initcall (or module_init ; see below) most of the time. Early initialization ( early_initcall ) is normally used by architecture-specific code to initialize hardware subsystems (power management, DMAs, etc

iOS: UIView subclass init or initWithFrame:?

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问题 I made a subclass of UIView that has a fixed frame. So, can I just override init instead of initWithFrame: ? E.g.: - (id)init { if ((self = [super initWithFrame:[[UIScreen mainScreen] bounds]])) { self.backgroundColor = [UIColor clearColor]; } return self; } The Xcode documentation for -initWithFrame: says: "If you create a view object programmatically, this method is the designated initializer for the UIView class. Subclasses can override this method to perform any custom initialization but

Why are alloc and init called separately in Objective-C?

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问题 Note: I'm relatively new to Objective-C and am coming from Java and PHP. Could someone explain to me why I always have to first allocate and then initialize an instance? Couldn't this be done in the init methods like this: + (MyClass*)init { MyClass *instance = [MyClass alloc]; [instance setFoo:@"bla"]; return instance; } + (MyClass*)initWithString:(NSString*)text { MyClass *instance = [MyClass init]; [instance setFoo:text]; return instance; } ... Is this just a relict from the old C days or

How to write Init method in Swift

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问题 I want to write init method in swift , Here I given NSObject model class in Objective-C -(id)initWithNewsDictionary:(NSDictionary *)dictionary { self = [super init]; if (self) { self.title = dictionary[@"title"]; self.shortDescription = dictionary[@"description"]; self.newsDescription = dictionary[@"content:encoded"]; self.link = dictionary[@"link"]; self.pubDate = [self getDate:dictionary[@"pubDate"]]; } return self; } How can I write this method in swift ? 回答1: that could be good bases for