| import 'dart:math'; | |
| import 'package:flutter/cupertino.dart'; | |
| import 'package:flutter/widgets.dart'; | |
| // This function can be passed to the [CupertinoSliverRefreshControl] builder function | |
| // in order to achieve a much more natural pull-to-refresh spinner. The out-of-the-box | |
| // implementation provided by Flutter uses a down-arrow which is very unfamiliar to iOS | |
| // users. This implementation is an attempt to make a more faithful implementation. | |
| // |
| // Models an enum with three mutually exclusive states: | |
| // - loading | |
| // - success (with an object of some type) | |
| // - error (with an Error object) | |
| abstract class LoadingStatus<T> { | |
| static const loading = const LoadingStatusLoading(); | |
| factory LoadingStatus.success(T object) = LoadingStatusSuccess; | |
| factory LoadingStatus.error(Error error) = LoadingStatusError; | |
| } |
Apple's Swift 4 recently introduced some amazing new features to support archiving/unarchiving as part of Foundation. This post explores some techniques for unarchiving/decoding while ensuring that instances of reference types can be shared within the object graph based on an arbitrary identifier.
Stepping back a little, imagine you had a simple construct representing a Car and its owner/driver. Using value types, this might look like:
struct Person : Codable {
let identifier: Int
}
| //: Playground - noun: a place where people can play | |
| import Foundation | |
| class DecodableCache<Key,Value> where Key : Hashable { | |
| private var values: [Key:Value] = [:] | |
| subscript(index: Key) -> Value? { | |
| get { | |
| return values[index] | |
| } |
| // Sometimes you want to watch a particular expression over time. Continually dumping | |
| // the value in a loop can be painful because of the sheer volume of values. This snippet | |
| // loops on a background thread checking the result of the passed expression - if the | |
| // value changes (and only then) does it output the new value. Note that this is NOT meant | |
| // as a replacement for a KVO-observable property... it is better suited to expressions | |
| // that do not post KVO events. | |
| // | |
| // Usage: watchExpression(every: 0.1) { someCodeThatReturnsAValue() } | |
| // | |
| // You can control how often the value will be checked using the every parameter (the example |
| From bf726b714c977045974a92d91d561a72c3045924 Mon Sep 17 00:00:00 2001 | |
| From: Tony DiPasquale <[email protected]> | |
| Date: Fri, 13 Mar 2015 13:08:22 -0400 | |
| Subject: [PATCH] Update the documentation for Swift 2 | |
| This also breaks up the main README.md into a Documentations directory | |
| with separate documents for different topics. This will be expanded upon | |
| with new PRs going forward. | |
| --- | |
| ArgoTests/JSON/JSONFileReader.swift | 3 +- |
| Build settings from command line: | |
| SDKROOT = iphonesimulator8.3 | |
| === BUILD TARGET Box-iOS OF PROJECT Box WITH CONFIGURATION Release === | |
| Check dependencies | |
| ProcessInfoPlistFile /Users/edwardsc/Library/Developer/Xcode/DerivedData/Box-davkzunrjrmqakbqofsdvgpbxmfk/Build/Products/Release-iphoneos/Box.framework/Info.plist Box/Info.plist | |
| cd /Users/edwardsc/Desktop/tmp/Blah/Carthage/Checkouts/Box | |
| export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/Users/edwardsc/bin:/Library/Java/JavaVirtualMachines/jdk1.7.0_75.jdk/Contents/Home/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/Server.app/Contents/ServerRoot/usr/bin:/Applications/Server.app/Contents/ServerRoot/usr/sbin:/usr/local/mysql/bin:/Users/edwardsc/.ec2/bin" |