SwiftUI-Notes | sample Notes app built using SwiftUI | Frontend Framework library
kandi X-RAY | SwiftUI-Notes Summary
kandi X-RAY | SwiftUI-Notes Summary
A laughably simple sample app for experimenting with SwiftUI and a CloudKit-backed CoreData store.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of SwiftUI-Notes
SwiftUI-Notes Key Features
SwiftUI-Notes Examples and Code Snippets
Community Discussions
Trending Discussions on SwiftUI-Notes
QUESTION
I'm looking for an operator that does the opposite of the collect operator:
- Allows you to map from one emission value to many emission values, emitting them on the stream. For example if I have the element
[1,2,3]
in the stream, I want to convert it into a stream that emits1
then2
, then3
. - Does not change the stream's completion state. Admittedly this
uncollect
operator wouldn't be exactly the opposite ofcollect
sincecollect
waits until the stream is finished. Withuncollect
it should just process results while the stream is unfinished, and not attempt to finish/unfinish the stream.
For example, I imagine this is how an uncollect
operator would function:
ANSWER
Answered 2021-May-13 at 17:47You can use flatMap
together with a new publisher
QUESTION
publisher.collect(<#T##strategy: Publishers.TimeGroupingStrategy##Publishers.TimeGroupingStrategy#>)
...ANSWER
Answered 2019-Dec-17 at 20:50In Xcode 11.3, the completion doesn't work extremely well, but the format isn't too complex. There are two options (as of iOS 13.3) that are published in the TimeGroupingStrategy enumeration:
byTime
byTimeOrCount
When you specify either of the strategies, you will also need to specify a scheduler that it runs upon, which is one of the parameters to those enumeration cases.
For example, to collect by time, with a 1.0 second interval of collection, using a DispatchQueue, you might use:
QUESTION
I have been working on an app with a compass in it that updates its heading based on this example for publishing heading changes and this example for creating a publisher to deal with those changes.
I'm very new to reactive programming, but the issue I'm running into seems like a common problem, so I wanted to post it and see if someone can help.
Sometimes it works for a little while, with new headings coming from the publisher and updating the UI, but then stops working. Other times, it doesn't ever start updating (an error is being delivered before any heading updates). In either case, it makes sense that the events would stop since a failure completion event is being sent to the publisher:
...ANSWER
Answered 2019-Dec-04 at 08:30As you pointed out, when an error occurs, that will always end a Combine pipeline built with off-the-shelf operators. This is a feature, not a bug. What can be especially surprising is that the pipeline will end even if you use an error-handling operator like catch
or replaceError
.
You can make a pipeline resilient to errors by wrapping any part of the pipeline where an error can occur in flatMap
.
Think of your main pipeline as the "outer" pipeline and the pipeline(s) wrapped in flatMap
as the "inner" pipeline(s). Make sure that the error type for the outer pipeline is Never
and it can continue to process values forever.
Consider an endpoint that returns the square of a number:
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