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I am trying to develop an app that shows a trip on a map from a list of trips.
I have a list of trips in a bottom sheet and when I click on one of these I would like to update the map showing the information of the trip (the tripPoints on the map).
struct Trip {
let id: String
let tripPoints: [TripPoints]
}
struct TripPoints {
let id: String
let latitude: CLLocationDegrees
let longitude: CLLocationDegrees
}
I tried to use a variable selectedTrip that I update everytime i click on one of the trip, but the map doesn't update.
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How can I make a check for the correctness of the entered data?
For example, the user needs to enter a digit, and until this is done, the program will not skip it further
In my case, you need to make sure that the user entered an integer, and not a string, double, etc.
Just create an infinite loop. If your read is successful break it. Something like:
while true {
if let line = readLine(), let value = Int(line) {
print("value", value)
break
}
}
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Closed 3 years ago.
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I'm making a math game. Every time I click a button a new question should appear with different results to choose from.
However every time I click the button which I think is the result it doesn't update the text but the others do.
See github: https://github.com/Combii/BrainTrainerSwift
Use UIButton.setTitle(, for:) method. I suggest you to change code in ViewController.swift:
func setNumbers(numberDic: Dictionary<String, Int>) {
let btns = [bt1, bt2, bt3, bt4]
UIView.performWithoutAnimation {
for (position, number) in numberDic {
btns[(Int(position) ?? 0) - 1]?.setTitle(String(number), for: .normal)
}
}
}
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I'm creating a desktop app with Swift and I need to pass a stop boolean after 5 seconds. How do I do this?
You can use asyncAfter to create an async delay. After the 5.0 seconds you can do what you want.
var stop: Bool = false
DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) { // runs after 5.0 seconds
// pass your stop boolean here
}
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I have a problem with youtube duration.
How to separate this string:
PT1H50M20S
to 1:50:20 with NSRegularExpression.
No need to use NSRegularExpression here, you can use NSCharacterSet instead.
let s = "PT1H50M20S"
s.componentsSeparatedByCharactersInSet(NSCharacterSet.letterCharacterSet())
.filter { $0 != "" }
.joinWithSeparator(":") // 1:50:20
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How could I write this in real code?
if (!UIImageView with origin.x > 50.0) {
//Exlcude the imageview from whatever happens in this statement.
}
if (imageView.frame.origin.x <= 50.0) {
// The code in this block won't bother the image views
// with 'x > 50.0' anymore
}