![]() This means you can either accept the optionality, or typecast it to a non-optional type and use the nil coalescing operator to handle missing values. When retrieving objects, the result is optional. If your tool bar is missing, just hit Option-Command-T, or go to View -> Show Toolbar. Let useTouchID = defaults.bool(forKey: "UseTouchID") You can open the tab by clicking the top right button on the tool bar. With that in mind, you can read values back like this: let age = defaults.integer(forKey: "Age") ![]() object(forKey:) returns AnyObject? so you need to conditionally typecast it to your data type. ![]() double(forKey:) returns a double if the key existed, or 0.0 if not.float(forKey:) returns a float if the key existed, or 0.0 if not.bool(forKey:) returns a boolean if the key existed, or false if not.This means that after NSUserDefaults has looked for a value in every. integer(forKey:) returns an integer if the key existed, or 0 if not. registerDefaults: adds the registrationDictionary to the last item in every search list.You need to know what these default values are so that you don't confuse them with real values that you set. When it comes to reading data back, it's still easy but has an important proviso: UserDefaults will return a default value if the setting can't be found. As an advance warning, you might find some old tutorials recommend calling the synchronize() method to force your data to save, but Apple has asked us not to do that for some years now.Īs mentioned, you can use UserDefaults to store arrays and dictionaries, like this: let array = ĭt(array, forKey: "SavedArray") When you set values like that, they become permanent – you can quit the app then re-launch and they'll still be there, so it's the ideal way to store app configuration data. Here's an example of setting some values: let defaults = UserDefaults.standardĭt("Paul Hudson", forKey: "Name")ĭt(Date.now, forKey: "LastRun") This system, called UserDefaults can save integers, booleans, strings, arrays, dictionaries, dates and more, but you should be careful not to save too much data because it will slow the launch of your app. If let existingHeaders = urlRequest.All iOS apps have a built in data dictionary that stores small amounts of user settings for as long as the app is installed. If you prefer, you can get the current headers, add your new values, then set them: Use urlRequest.addValue to avoid replacing an existing headers. UrlRequest.addValue("application/json", forHTTPHeaderField: "Accept") ![]() UrlRequest.addValue(MY_API_KEY, forHTTPHeaderField: "X-Mashape-Key") Here’s an example of creating an Alamofire request using a URLRequest: When creating that request you can add headers. When creating Alamofire requests you can provide a URLRequest instead of passing in the URL as a string like we did above. Let sessionManager = Alamofire.SessionManager(configuration: configuration)Īs before, if you need to check the headers are being added correctly use debugPrint to check the request: create a session manager with the configuration Let configuration = faultĬonfiguration.httpAdditionalHeaders = headers An example of when you might use it is for API version headers: This shouldn’t be used for authentication. If you need to specify a header for all of the calls you make, then create a custom session configuration and add it there. H "Accept-Encoding: gzip q=1.0, compress q=0.5" \ Which will show you the equivalent curl statement: Let request = Alamofire.request("", headers: headers) To make sure your headers are being sent, you can use debugPrint to inspect the request: For the headers we need for Mashape there are better options that will avoid having to add the headers to each request. This way of including headers is useful when you only need to pass a header for a single call. HTTPHeaders is just a dictionary of strings: Here’s how we’d do that for our two headers: When creating a request, we can pass the headers as an argument. This tutorial has been written using Swift 3.0, Xcode 8.0, and Alamofire 4.0. You can see the documentation for the Urban Dictionary API in Mashape. Sign up for a free account to get an API key to use wherever you see MY_API_KEY in this tutorial. Mashape has tons of free APIs that you can use play with to build your skills. Here’s a curl statement with those headers included: curl -get -include '' \ The custom headers we set up previously were an API key and JSON accept header for the Mashape API: We’ll show how to handle both of those scenarios and the four different ways that headers can be included in Alamofire calls. When dealing with custom headers in Alamofire requests you might need to include a header for all of your API calls or just for a single call. Let’s figure out how to handle custom headers in Swift 3 and Alamofire 4. I previously wrote about adding custom headers to Alamofire 3 calls.
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