{"id":2267,"date":"2016-11-18T16:19:18","date_gmt":"2016-11-18T10:49:18","guid":{"rendered":"https:\/\/www.innovationm.com\/blog\/?p=2267"},"modified":"2023-01-20T18:55:58","modified_gmt":"2023-01-20T13:25:58","slug":"cache-application-data-in-ios","status":"publish","type":"post","link":"https:\/\/www.innovationm.com\/blog\/cache-application-data-in-ios\/","title":{"rendered":"Application Data Caching in iOS"},"content":{"rendered":"

Cache is a prominent term which you\u2019ve heard very often in Computing world. Alike, we have cache memory in our iPhones. <\/span><\/p>\n

As per the <\/span>Wikipedia<\/span><\/i>, description of cache is <\/span><\/p>\n

\u201cCache Memory <\/span><\/i>is a fast and relatively small memory that is completely handled by the hardware, that stores the most recently used \u00a0<\/span><\/i>main memory<\/span><\/i><\/a> (RAM). The function of the cache memory is to speed up the RAM data access (performance increasing).<\/span><\/i>\u201d<\/span><\/p>\n

Every Smartphone OS like Android or iOS allow developer to cache their data in Cache Memory. Internally, cache Memory is handled by OS itself and they can clear app-cache when OS is in shortage of cache memory. So, it\u2019s quite unreliable to store data in cache memory but you can use it to store data for a particular active session. <\/span><\/p>\n

Assumption<\/b><\/p>\n

Say, i have three View Controllers (A, B and C) and i have typed some name in A View controller. Then, I navigate to Viewcontroller-B and them moved to C. In C View Controller, I need what you have typed in \u00a0View Controller-A. In such cases, you should maintain a global property which you can access from any screen. That particular file is CacheManager which will handle all the global property which store the instance or value.<\/span><\/p>\n

 <\/p>\n

So it would be like:<\/span><\/p>\n

When I was typing name in text field of View Controller-A then, at that point of time I will store the inputted name in a Global Property (i.e Cache) which you can access it from View Controller-C. <\/span><\/p>\n

Basically, In Step (1) we are saving the \u2018<\/span>name\u2019 <\/span><\/i>text field value and then, in Step (2) we are trying to retrieve data what we\u2019ve cached. Cache Data retains their data till application\u2019s active session. It will loose it\u2019s state when you kill your app. So, every time when you launch your app you\u2018ll have new cache. <\/span><\/p>\n

Customize Your Cache Manager<\/b><\/p>\n

You are going to maintain a <\/span>CacheManager<\/span><\/i> file in your project which is a singleton class with list of properties.<\/span><\/p>\n

For instance, I want to cache my <\/span>name<\/span><\/i> then, I\u2019ll declare a property with String-Optional type.<\/span><\/p>\n

var userName:String?<\/pre>\n
And, after every declaration make sure you put your property to nil in clear() method. As, we will use this method to clear cache when we want to de-initialise all the property.<\/span><\/p>\n
userName = nil<\/pre>\n
Demonstration<\/b><\/p>\n
I assume you have enough skills to design a screen. So, there is a View Controller which list two Text Fields (which accepts Name and Account Number) along with three buttons (Add to Cache, Get From Cache and Clear Cache).<\/span><\/p>\n
Last, we need a Label where you can show your cached data.<\/span><\/p>\n
\"picture2\"<\/a><\/p>\n
Next, we will create outlets for text fields & label and touch up connection for buttons. <\/span><\/p>\n
Next, we will modify CacheManager as per our need. For time being, we want to cache employee name and employee number what user is passing. So, we will declare two Optional-String type properties.<\/span><\/p>\n
Then Our Cache Manager would be like:<\/span><\/p>\n
\/\/MARK:- Stored Property for  Username(String)\r\nvar employeeName:String?\r\n\r\n  \/\/MARK:- Stored Property for Account Number (String)\r\n  var employeeID:String?\r\n\r\n\/\/MARK:- Computed Property for User Age\r\n    \/\/Special Case : I want to restrict user to have their AGE to '18'. They can't allow you to have their age more than 18.\r\n    var employeeRating:Int?{\r\n        \r\n        didSet{\r\n            if employeeRating! > 10{\r\n                employeeRating = 10\r\n            }\r\n        }\r\n        \r\n    }\r\n  \r\n \/\/MARK: Clear Cache\r\n    public func clear(){\r\n        \r\n        employeeName = nil\r\n        employeeID = nil\r\n        employeeRating = 0\r\n\r\n\r\n    }<\/pre>\n
1. Write Data to Cache<\/b><\/p>\n
Now, we are ready with our CacheManager and now we will store corresponding value when you click on button \u201cAdd to Cache\u201d.<\/span><\/p>\n
private func cacheData(employeeName:String, employeeID:String, employeeRating:String){\r\n    \r\n        \r\n        \/\/Employee Name\r\n        CacheManager.shared.employeeName = employeeName\r\n        \r\n        \/\/Employee ID\r\n        CacheManager.shared.employeeID = employeeID\r\n        \r\n        \/\/Rating\r\n        CacheManager.shared.employeeRating = Int(employeeRating) ?? 0<\/pre>\n
CacheManager <\/span><\/i>is a singleton class which force you to use only single instance of cachemanager object. Hence, we have a <\/span>shared <\/span><\/i>object which return you only instance of CacheManager across the app. <\/span><\/p>\n
That\u2019s the sole reason we are using <\/span>CacheManager.shared<\/span><\/i><\/p>\n
CacheData() is a private method which is called from buttonCacheData_Clicked(_:) along with the three parameters.<\/span><\/p>\n
self.cacheData(employeeName: self.textFieldEmployeeName.text!, employeeID: self.textFieldEmployeeId.text!, employeeRating: self.textFieldRatting.text!)<\/pre>\n
Here, we are passing the text field\u2019s value to the cacheData() method which ultimately store data in cache object.<\/span><\/p>\n
2. Read Data From Cache<\/b><\/p>\n
 <\/p>\n
Next, we will see how to retrieve data from Cache.<\/span><\/span><\/p>\n
Alike, every property getter we’ll call by its name. So, we will write something like this:<\/span><\/p>\n
let cacheEmployeeID = CacheManager.shared.employeeID ?? \"\"\r\nlet cacheEmpolyeeName = CacheManager.shared.employeeName ?? \"\"\r\nlet cacheEmployeeRating = CacheManager.shared.employeeRating ?? 0<\/pre>\n
Note <\/b>: ?? operator checks if the corresponding value is nil then it will set the \u201cempty\u201d.<\/span><\/p>\n
Since, properties are Optional type so we have to check whether it is returning nil value or not. <\/span><\/p>\n
If it\u2019s a nil value then store \u201c \u201d else return its value. That\u2019s the sole reason to use \u201cnil-coalescing operator (??)\u201d.<\/span><\/p>\n
3. Clear Cache<\/b><\/p>\n
What if, i want to clear all data what i have cache. Then, you just call a method i.e. clear()<\/span><\/p>\n
CacheManager.shared.clear()<\/pre>\n
\"picture4\"<\/a><\/p>\n
Conclusion<\/b><\/p>\n
CacheManager<\/span><\/i> allow you to store state of any object or any value which you want to use in further screen of your app. Caching is only feasible when you don’t to persist your data permanently. As, it will reset its value when app restart itself. It come up with the best practice to maintain a Cache when you storing state for a single active-session of App.<\/span><\/span><\/p>\n
 <\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
Cache is a prominent term which you\u2019ve heard very often in Computing world. Alike, we have cache memory in our iPhones. As per the Wikipedia, description of cache is \u201cCache Memory is a fast and relatively small memory that is completely handled by the hardware, that stores the most recently used \u00a0main memory (RAM). The […]<\/p>\n","protected":false},"author":1,"featured_media":2271,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,71],"tags":[181,178],"class_list":["post-2267","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ios","category-mobile","tag-ios-10","tag-swift-3-0"],"yoast_head":"\nApplication Data Caching in iOS - InnovationM - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.innovationm.com\/blog\/cache-application-data-in-ios\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Application Data Caching in iOS - InnovationM - Blog\" \/>\n<meta property=\"og:description\" content=\"Cache is a prominent term which you\u2019ve heard very often in Computing world. 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