Modern Cocoa development involves a lot of asynchronous programming using closures and completion handlers, but these APIs are hard to use. This gets particularly problematic when many asynchronous operations are used, error handling is required, or control flow between asynchronous calls gets complicated. This proposal describes a language extension to make this a lot more natural and less error prone.
This paper introduces a first class Coroutine model to Swift. Functions can opt into to being async, allowing the programmer to compose complex logic involving asynchronous operations, leaving the compiler in charge of producing the necessary closures and state machines to implement that logic.
[個人筆記]後台IMEI表格快速按，程式崩潰問題
上下快速按，約N次後，畫面不再顯示資料。Debug後發現以下錯誤訊息:
[中文訊息]
已超過連接逾時的設定。在取得集區連接之前超過逾時等待的時間，可能的原因為所有的共用連接已在使用中，並已達共用集區大小的最大值。
[發生原因]
每一次的Row select將會call兩支api，最終造成DB連線次數超過
查看資料庫連線次數發現停在101次
[參考資源]
https://dotblogs.com.tw/eason/2011/12/15/62290
Beginning in Android 6.0 (API level 23), users grant permissions to apps while the app is running, not when they install the app. This approach streamlines the app install process, since the user does not need to grant permissions when they install or update the app. It also gives the user more control over the app's functionality; for example, a user could choose to give a camera app access to the camera but not to the device location. The user can revoke the permissions at any time, by going to the app's Settings screen.
| import android.Manifest; | |
| import android.annotation.TargetApi; | |
| import android.app.Activity; | |
| import android.content.Context; | |
| import android.content.pm.PackageManager; | |
| import android.os.Build; | |
| import android.support.annotation.NonNull; |
| import RealmSwift | |
| final class Foo: Object { | |
| dynamic var code: String = UUID().uuidString | |
| dynamic var timestamp: Date = Date() | |
| override static func primaryKey() -> String? { | |
| return "code" | |
| } | |
| // | |
| // UserInfoCell.swift | |
| // | |
| // Created by Mathias Claassen on 30/8/16. | |
| // Copyright © 2016 Xmartlabs. All rights reserved. | |
| // | |
| import Foundation | |
| import Eureka |
| // derived from hhttps://gist.github.com/andreif/ba209f4749d590406562 | |
| import UIKit | |
| struct Page { | |
| var title: String | |
| var image: String | |
| } |
Cronjob can prevent your application and your users from unexpected downtimes.
Create a file called starter.sh in your application's home folder and copy the following code:
#!/bin/sh
if [ $(ps -e -o uid,cmd | grep $UID | grep node | grep -v grep | wc -l | tr -s "\n") -eq 0 ]
| //const TASKS = {task:"Initial Task", completed:true}; | |
| class TodoApp extends React.Component { | |
| constructor(props){ | |
| super(props); | |
| this.changeTask = this.changeTask.bind(this); | |
| this.addTask = this.addTask.bind(this); | |
| this.changeViewByFilter = this.changeViewByFilter.bind(this); | |
| this.removeTask = this.removeTask.bind(this); | |
| this.state={ | |
| tasks:[], filter: 'all' |