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What is the best approach to iterate all SKSpriteNodes in a Scene using Swift?
If your sprites have their name properties set, you can use enumeration closure:
self.enumerateChildNodesWithName(spriteName) {
node, stop in
// Do something with node.
}
I figured it out. Sample Swift code below.
self.enumerateChildNodesWithName("SomeSprite*", usingBlock: {
(node: SKNode!, stop: UnsafeMutablePointer <ObjCBool>) -> Void in
// do something with node or stop
let action = SKAction.rotateByAngle(CGFloat(M_PI), duration:0.8)
node.runAction(SKAction.repeatActionForever(action))
}
})
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Image(uiImage: image ?? UIImage(named: "photo")!)
.resizable()
.frame(width: 300, height: 300)
Crash error
Implicity unwrapped nil value
How can I unwrap this?
How can I unwrap this?
According to the error message, you've got an implicitly unwrapped nil value. That is, you have some variable declared like:
var image: UIImage! = ...
You should only ever use implicit unwrapping when you know for certain that the object will exist as soon as the variable is initialized, and that it will continue to exist for the life of the variable.
The way to fix your problem is to either ensure that the object exists, which is not currently the case since you're getting nil, or stop using implicit unwrapping. You could, for example, change your variable declaration to something like:
var image: UIImage? = ...
Then you'd have a regular optional that you could attempt to unwrap normally as you're doing in the first line of your question.
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How can I fix this error, while still keeping the value of the array the same? Here's a screenshot of my code:
var group_array is defined out of VStack scope.
I suggest using #State in order to store group_array.
#State var group_array: Array
var body: some View {
....
If I have understood correctly the question, and the problem... you have to set var group_array as a property of the class.
This way you could access it in the Firestore function, and read it in body view.
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For example if I have:
var hostingController: UIHostingController<Content>! = nil
What does it example mean when I put content inside the greater than and less than signs?
It's a generic definition. Generics are useful when you’re writing code that could be applied to many different types.
For example, that means that UIHostingController could be initialised with any view.
hostingController = UIHostingController.init(rootView: ContentView())
struct ContentView: View {
var body: some View {
Text("some text")
}
}
Hope this is helpful!
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From here I'm trying to grab speed data from the class, but I cannot figure how.
Let's say I have a class SpeedTest; in MyViewController I instantiate:
let mySpeedTest = SpeedTest()
starting test
mySpeedTest.startSpeedTest(usedVC: self)
now, how do I grab the result in my MyViewController?
You need
mySpeedTest.checkForSpeedTest()
mySpeedTest.speedTestCompletionBlock = { [weak self] (megabytesPerSecond ,error) in
print(megabytesPerSecond)
}
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code:
note.userInfo as! NSDictionary
warning:
Cast form '[NSObject : AnyObject]?' to unrelated type 'NSDictionary' always fails
To say
let userInfo = note.userInfo as! NSDictionary
is silly, as this is already an NSDictionary. But it could be nil, so it is an Optional wrapping a dictionary. So you need to unwrap it. If you are certain there is a userInfo, then say
let userInfo = note.userInfo!
If you are not sure, then unwrap safely.