Networking with Background Tasks in iOS 13
Reading time: 4 min
This recipe shows how to perform a GET request in the background using BGTaskScheduler and BGAppRefreshTaskRequest. For whatever reason, this has way too many gotchas:
- You can't use Alamofire, you have to use
URLSession. - You can use
URLSessionDataTask, it has to be aURLSessionDownloadTask. Why? Beats me. - You can't use callbacks, you must use delegates to track request progress and completion.
Infinite Scroll List in SwiftUI
Reading time: 4 min
This recipe shows how to implement infinite scrolling list in SwiftUI. The result code is a single view, that can be used just like any other List. It renders data from a collection via a ViewBuilder and triggers loading when the list is scrolled to the bottom.
File Tree with Expanding List in SwiftUI
Reading time: 2 min
This recipe shows how to create a simple file tree using SwiftUI expandable list. This feature is useful for representing any hierarchical data structure, allowing the user to expand and collapse branches to navigate the tree.
SwiftUI Toolbar Placement Cheatsheet
Reading time: 5 min
This recipe is a cheatsheet for various ToolbarItemPlacement values and combinations on iOS. This is useful because:
- The namings of the placement values don't necessarily clearly depict where will a
ToolbarItemend up. - Some values don't play well with each other. E.g,
.primaryActionwill hide.confirmationActionif it's placed above it, but not if placed below. - Some positions change if
TitleDisplayModeis.inline.
Map with Annotations in SwiftUI
Reading time: 6 min
This recipe shows how to add a Map View using SwiftUI. It also shows how to add pins/markers/annotations to the map, allowing for mixing of different map annotation types.
