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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
}
}
Related
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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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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 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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Very strange issue.
I have the following code:
NSDictionary* notificationUserInfo = [pNotification userInfo];
NSManagedObject* newShoppingFilter = [notificationUserInfo valueForKey:#"shoppingListFilter"];
self.shoppingListFilter = newShoppingFilter;
NSLog(#"%# tapped", [newShoppingFilter valueForKey:#"name"]);
For some reason the self.shoppingListFilter = newShoppingFilter is not setting the variable.
I assume that this is some issue with not initializing the self.shoppingListFilter variable in some way but I cannot figure this out. The NSLog shows the right output, newShoppingFilter is not null but self.shoppingListFilter is.
Any help is appreciated.
I bet newShoppingFilter is nil. Most likely, there is no key "shoppingListFilter" in the notification user info dictionary.
Set a breakpoint at the line that assigns a value to self.shoppingListFilter and check the value of newShoppingFilter. Also display the entire contents of notificationUserInfo.
Post the code that creates the user info dictionary and passes it into the notification that you are posting. That would help track down the problem.
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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
}