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QUESTION
I am writing my project and wondered. When I read literature or watch videos, I see that this is bad practice. Why? Is this bad for the system?
What is the difference between this
...ANSWER
Answered 2021-Jun-16 at 00:17You have to initialize all instance properties somehow. And you have to do it right up front, either in the declaration line or in your init
method.
But what if you don't actually have the initial value until later, like in viewDidLoad
? Then it is silly to supply a real heavyweight value only to replace it later:
QUESTION
I want to write a computed property for Int. How can I refer to the current Int value?
...ANSWER
Answered 2021-Jun-04 at 10:55You need to use self
.
QUESTION
the swiftui code below should apply the sephia.tone filter to the current photo, to do it I used the code below but the filter is not applied, can anyone explain to me where the problem is? when I click on sepia I make the call to the function that applies the CiFilter,what is this due to? because the filter is not applied correctly
Swift UI Code:
...ANSWER
Answered 2021-Jun-15 at 16:15You need to set input image for the filter and take care of the interoperately between Image
and UImage
QUESTION
WWDC21 introduces Swift 5.5, with async/await. Following the Explore structured concurrency in Swift and Meet async/await in Swift WWDC21 sessions, I'm trying to use the async let function.
Here's my Playground code:
...ANSWER
Answered 2021-Jun-11 at 00:14My advice would be: don't try this in a playground. Playgrounds aren't ready for this stuff yet. Your code compiles and runs fine in a real project. Here's an example:
QUESTION
I'm learning anonymous functions and "define-and-call" functions in Swift using this online compiler (since I don't have a Mac), and I wrote this code to try out what I have learnt by making an anonymous function that adds two numbers and prints the result:
...ANSWER
Answered 2021-Jun-15 at 14:48The reason seems to be explained in the source:
QUESTION
In my iOS app "Progression" there is rarely a crash (1 crash in ~1000+ Sessions) I am currently not able to fix. The message is
Progression: protocol witness for TrainingSetSessionManager.update(object:weight:reps:) in conformance TrainingSetSessionDataManager + 40
This crash points me to the following method:
...ANSWER
Answered 2021-Jun-15 at 13:26While editing my initial question to add more context as Jay proposed I think it found the issue.
What probably happens? The view where the crash is, contains a table view. Each cell will be configured before being presented. I use a flag which holds the information, if the amount of weight for this cell (it is a strength workout app) has been initially set or is a change. When prepareForReuse is being called, this flag has not been reset. And that now means scrolling through the table view triggers a DB write for each reused cell, that leads to unnecessary writes to the db. Unnecessary, because the exact same number is already saved in the db.
My speculation: Scrolling fast could maybe lead to a race condition (I have read something about that issue with realm) and that maybe causes this weird crash, because there are multiple single writes initiated in a short time.
Solution: I now reset the flag on prepareForReuse to its initial value to prevent this misbehaviour.
The crash only happens when the cell is set up and the described behaviour happens. Therefor I'm quite confident I fixed the issue finally. Let's see. -- I was not able to reproduce the issue, but it also only happens pretty rare.
QUESTION
How do I produce an animation that simulates the burning effect of fire consuming an UIView
from top to bottom in Swift?
I found Fireworks, an app that allows users to tweak and try out different settings of CAEmitterLayer
with instant results. The effects are great for applying to a whole screen but how would I use it for my purpose - where the UIView
must disappear as the fire consumes it from one end to the other?
Is there some tutorial on consuming UIView
s with fire using the particle emitter anywhere? I know that I’m supposed to show some code but anything I put here would be irrelevant. I’ve also exhausted my search engine looking for something similar. That’s how I found the Fireworks app actually.
This seems to be a use case that shouldn't be uncommon.
...ANSWER
Answered 2021-Jun-14 at 14:24I was once in your shoe before and came across this Open source library called particle animations.
I would NOT recommend using the library itself since it's deprecated. But I would recommend referring to its source code to get an idea of how to use CAEmitterLayer and CAEmitterCell
to make the looks of a Fire!
As you could see from its readme, it has direct examples of Fire. It also states that even Apple and Facebook uses CAEmitterLayer and CAEmitterCell
to produce the effect of a fire.
Feel free to ask for more questions.
QUESTION
I am successfully using the Tapkey token exchange endpoint to exchange a Firebase token for a Tapkey one, but am then having an error calling login.
I am requested the following Scope's when exchanging the token:
register:mobiles read:user read:ip:users handle:keys
My swift code is below (basically lifted straight from the documentation):
...ANSWER
Answered 2021-Jun-15 at 08:30Users of external identity providers have to be registered before the can login.
You can find the details here: https://developers.tapkey.io/api/authentication/identity_providers/#working-with-users
When it is necessary for your use case, that these users are automatically created when they login, please send a request to tapkey support and they will enable this feature for you.
QUESTION
I have been testing the async/await functionality previewed in the Swift 5.5 release, but I am unable to collect the results from an async function and display them using SwiftUI. Here is my code:
...ANSWER
Answered 2021-Jun-14 at 21:52I'm the author of the article you referenced.
As discussed in Discover concurrency in SwiftUI, views can make use of the new .task { }
and .refreshable { }
modifiers to fetch data asynchronously.
So you now have the following options to call you async code:
QUESTION
Im trying to make a generator for my buttons/actions. How could I do this? >
...ANSWER
Answered 2021-Jun-14 at 21:30You can try this -
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