nshipster.cn

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NSCoding / NSKeyedArchiver - NSHipster

http://nshipster.com/nscoding

NSCoding / NSKeyed Archiver. Written by Mattt Thompson. Among the most important architectural decisions made when building an app is how to persist data between launches. The question of how, exactly, to re-create the state of the app from the time it was last opened; of how to describe the object graph in such a way that it can be flawlessly reconstructed next time. On iOS and OS X, Apple provides two options: Core Data. Compliant classes to and from a data representation). Might go something like this:.

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Swift & the Objective-C Runtime - NSHipster

http://nshipster.com/swift-objc-runtime

Swift and the Objective-C Runtime. Written by Nate Cook. Even when written without a single line of Objective-C code, every Swift app executes inside the Objective-C runtime, opening up a world of dynamic dispatch and associated runtime manipulation. To be sure, this may not always be the case Swift-only frameworks, whenever they come, may lead to a Swift-only runtime. But as long as the Objective-C runtime is with us, let’s use it to its fullest potential. Come to the rescue. For example, to add a.

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Key-Value Observing - NSHipster

http://nshipster.com/key-value-observing

Written by Mattt Thompson. Ask anyone who’s been around the NSBlock a few times: Key-Value Observing has the. API in all of Cocoa. It’s awkward, verbose, and confusing. And worst of all, its terrible API belies one of the most compelling features of the framework. When dealing with complicated, stateful systems, dutiful book-keeping is essential for maintaining sanity. Lest the left hand not know what the right hand doeth, objects need some way to publish and subscribe to state changes over time. Of all ...

tashanzhishi.net

IT相关有价值的个人网站和博客集锦 | 他山之石

http://www.tashanzhishi.net/Project/3145780

从 aspnet ajax 到 mvc ，linq 等等很多东西都跟随着老姐夫一路走来，也早早入手了赵三本，可惜所学依然是皮毛。 笔者一直在局限于 .NET 开发，对于赵姐夫情有独钟，常看常新，受益匪浅。 唐巧， InfoQ 编辑, iOS开发, 创业者。 NSHipster，关注被忽略的 Objective-C、Swift 和 Cocoa 特性。

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nil / Nil / NULL / NSNull - NSHipster

http://nshipster.com/nil

Nil / Nil / NULL / NSNull. Written by Mattt Thompson. Understanding the concept of nothingness is as much a philosophical issue as it is a pragmatic one. We are inhabitants of a universe of. Yet reason in a logical universe of existential uncertainties. As a physical manifestation of a logical system, computers are faced with the intractable problem of how to represent. In Objective-C, there are several different varieties of. The reason for this goes back to a common NSHipster refrain. Is defined as a.

codedata.cn

开发者酷站 - CodeData

http://www.codedata.cn/sites

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Swift Operators - NSHipster

http://nshipster.com/swift-operators

Written by Mattt Thompson. What would a program be without statements? A mish-mash of classes, namespaces, conditionals, loops, and namespaces signifying nothing. Statements are what do the work of a program. They are the very execution of an executable. If we were to take apart a statement say. Decomposing it into its constituent parts, we would find an operator and operands:. Although expressions are flat, the compiler will construct a tree representation, or AST:. Compound statements, like. 2 * 3) % 4).

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rand(3) / random(3) / arc4random(3) / et al. - NSHipster

http://nshipster.com/random

Rand(3) / random(3) / arc4random(3) / et al. Written by Mattt Thompson. What passes for randomness is merely a hidden chain of causality. In a mechanical universe of material interactions expressed through mathematical equations, it is unclear whether nature encodes an element of chance, or if it’s a uniquely human way to reconcile uncertainty. We can be sure of one thing, however: in the closed, digital universe of CPU cycles, processes, and threads, there is no true randomness, only. Another good optio...

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NSError - NSHipster

http://nshipster.com/nserror

Written by Mattt Thompson. To err is human. To. All programs on a Unix system are a child process of another process, forking all the way from the original process, the unmoved mover:. 1 (which in the case of OS X is. When the executable finishes, it communicates a status code between. To its parent, as a way to communicate why or how the process exited. This can create something of a predicament. Languages more drama-prone and trigger-happy than Objective-C reconcile this by abusing the hell out of exce...