I want change a label when the textfield contains one of the words in the two arrays, when I start the app, if I insert a word of the first array works. Then I insert a word of the second array and also this works, but if I insert again one word of the first array, the label don't change.
var one = ["word1", "word2", "word3"]
var two = ["word4", "word5", "word6"]
var count1 = 0
var count2 = 0
let s = textField.text?.lowercased()
for item in one{
if (s?.contains(item))!{
count1+=1
}
}
if count1 > 0{
label.text = "First array"
}
for item in two{
if (s?.contains(item))!{
count2+=1
}
}
if count2 > 0{
label.text = "Second array"
}
I'm not exactly clear on what you are asking, but one issue with the above code is that you do not reset count1 after the first loop - so if array one contains item, you will set label.text to "Second array" even if the second array does not contain item.
I'm assuming that count1 is declared outside the displayed code, as you don't declare it as a var within either loop. This means the scope includes both loops.
i guess you missed second counter for array two or you better try to figure another solution for this kind of tasks
var one = ["word1", "word2", "word3"]
var two = ["word4", "word5", "word6"]
var count1 = 0
var count2 = 0
let s = "word1"
var label = ""
for item in one{
if (s.contains(item)) {
count1+=1
}
}
if count1 > 0{
label = "First array"
}
for item in two{
if (s.contains(item)) {
count2+=1
}
}
if count2 > 0{
label = "Second array"
}
Found solution myself.
var one = ["word1", "word2", "word3"]
var two = ["word4", "word5", "word6"]
let s = label.text?.lowercased()
for item in one{
if (s?.contains(item))!{
label.text = "first array"
}
}
for item in two{
if (s?.contains(item))!{
label.text = "second array"
}
}
Related
I have an array myarray and I am using a for loop to get a few information which I add to myarray. But next time the for-loop runs, I don't want to create a separate index, but instead the 2nd time and so on, I want to append the information to myarray[0].
How do I do that?
var myarray = [String]()
for var j in 0 < 12 {
// do some stuff
for var i in 0 ..< 10 {
let parta = json?["users"][j]["name"].string
let partb = json?["users"][j]["Lname"].string
let partc = json?["users"][j]["dob"].string
myarray.append("\(parta)-\(partb)-\(partc)---")
// Here when the for loop comes back again (i = 1) , i dont want to make
// myarray[1] , but instead i want myarray[0] ,
// having value like [parta-partb-partc--parta-partb-partc]
}
}
Basically what I am trying to do is, append the new name/lname/dob values at myarray[0] without affecting the current value/string at myarray[0].
You can insert single element and also add array as below.
Swift 5
var myarray = [String]()
myarray.insert("NewElement", at: 0)
myarray.insert(contentsOf: ["First", "Second", "Third"], at: 0)
If I understand your question correctly, you want to create one long string and add the new data always at the beginning of the string. One way to do that would be:
// Store somewhere
var myString = String()
for var i in(0..<10) {
let parta = json?["name"].string
let partb = json?["Lname"].string
let partc = json?["dob"].string
let newString = "\(parta)-\(partb)-\(partc)---")
newString.append(myString)
myString = newString
// Here when the for loop comes back again (i = 1) , i dont want to make
//myarray[1] , but instead i want myarray[0] ,
//having value like [parta-partb-partc--parta-partb-partc]
}
I have an array of strings. I would like to display 3 unique items from this array randomly. Then every 5 seconds, one of the items gets replaced with another unique item (my idea here is adding an animation with a delay).
I can display the 3 strings, however sometimes they repeat, and the timer is not updating the factLabel label.
Here's my progress:
override func viewDidLoad() {
super.viewDidLoad()
updateUI()
}
func randomFact() -> String {
let arrayCount = model.cancunFacts.count
let randomIndex = Int(arc4random_uniform(UInt32(arrayCount)))
return model.cancunFacts[randomIndex]
}
// Display the facts
func updateUI() {
Timer.scheduledTimer(timeInterval: 5, target: self, selector: #selector(randomFact), userInfo: nil, repeats: true)
factLabel.text = randomFact() + " " + randomFact() + " " + randomFact()
}
How do I get the text to always update randomly, without the 3 facts repeating?
Create an array of indexes. Remove a random index from the array, use it to index into your strings. When the array of indexes is empty, refill it.
Here is some sample code that will generate random, non-repeating strings:
var randomStrings = ["Traitor", "Lord Dampnut", "Cheeto-In-Chief",
"F***face Von Clownstick", "Short-Fingered Vulgarian",
"Drumpf", "Der Gropenführer", "Pumpkin in a suit"]
var indexes = [Int]()
func randomString() -> String {
if indexes.isEmpty {
indexes = Array(0...randomStrings.count-1)
}
let index = Int(arc4random_uniform(UInt32(indexes.count)))
let randomIndex = indexes.remove(at: index)
return randomStrings[randomIndex]
}
for i in 1...100 {
print (randomString())
}
(Note that it may still generate repeating strings in the case when the array of indexes is empty and it needs to be refilled. You'd need to add extra logic to prevent that case.)
Version 2:
Here is the same code, modified slightly to avoid repeats when the array of indexes is empty and needs to be refilled:
var randomStrings = ["tiny-fingered", "cheeto-faced", "ferret-wearing", "sh*tgibbon"]
var indexes = [Int]()
var lastIndex: Int?
func randomString() -> String {
if indexes.isEmpty {
indexes = Array(0...randomStrings.count-1)
}
var randomIndex: Int
repeat {
let index = Int(arc4random_uniform(UInt32(indexes.count)))
randomIndex = indexes.remove(at: index)
} while randomIndex == lastIndex
lastIndex = randomIndex
return randomStrings[randomIndex]
}
for i in 1...10000 {
print (randomString())
}
Even though it's using a repeat...while statement, the repeat condition will never fire twice in a row, because you'll never get a repeat except right after refilling the array of indexes.
With that code, if there is a repeat, the selected string will be skipped on that pass through the array. To avoid that, you'd need to adjust the code slightly to not remove a given index from the array until you verify that it is not a repeat.
Version 3:
Version 2, above, will skip an entry if it picks a repeat when it refills the array. I wrote a 3rd version of the code that refills the array, removes the last item it returned so that it can't repeat, and then adds it back to the array once it's picked a random item. This third version will always return every item in the source array before refilling it and will also never repeat an item. Thus it's truly random with no bias:
import UIKit
var randomStrings = ["Traitor", "Lord Dampnut", "Cheeto-In-Chief",
"F***face Von Clownstick", "Short-Fingered Vulgarian",
"Drumpf", "Der Gropenführer", "Pumpkin in a suit"]
var indexes = [Int]()
var lastIndex: Int?
var indexToPutBack: Int?
func randomString() -> String {
//If our array of indexes is empty, fill it.
if indexes.isEmpty {
indexes = Array(0...randomStrings.count-1)
print("") //Print a blank line each time we refill the array so you can see
//If we have returned an item previously, find and remove that index
//From the refilled array
if let lastIndex = lastIndex,
let indexToRemove = indexes.index(of: lastIndex) {
indexes.remove(at: indexToRemove)
indexToPutBack = indexToRemove //Remember the index we removed so we can put it back.
}
}
var randomIndex: Int
let index = Int(arc4random_uniform(UInt32(indexes.count)))
randomIndex = indexes.remove(at: index)
//If we refilled the array and removed an index to avoid repeats, put the removed index back in the array
if indexToPutBack != nil{
indexes.append(indexToPutBack!)
indexToPutBack = nil
}
lastIndex = randomIndex
return randomStrings[randomIndex]
}
for i in 1...30 {
print (randomString())
}
Sample output:
Short-Fingered Vulgarian
F***face Von Clownstick
Pumpkin in a suit
Drumpf
Lord Dampnut
Traitor
Der Gropenführer
Cheeto-In-Chief
Der Gropenführer
Drumpf
Lord Dampnut
Short-Fingered Vulgarian
Cheeto-In-Chief
Pumpkin in a suit
Traitor
F***face Von Clownstick
Short-Fingered Vulgarian
F***face Von Clownstick
Drumpf
Traitor
Cheeto-In-Chief
Lord Dampnut
Pumpkin in a suit
Der Gropenführer
Lord Dampnut
Short-Fingered Vulgarian
Pumpkin in a suit
Cheeto-In-Chief
Der Gropenführer
F***face Von Clownstick
Your timer is calling random fact, which simply returns a fact and doesn't do anything. You should probably have some third method called initializeTimer that does the Timer.scheduledtimer, which you should take out of your updateUI method. That timer should call updateUI. This would fix your labels updating. Also you would call initializeTimer in your viewDidLoad instead of updateUI. As far as preventing the repetition of facts, Duncan C's idea of having a separate array that you remove items from as you set new random facts then fill back up when it's empty seems like a good idea.
It may be easiest to maintain two arrays, usedStrings and unusedStrings, of random strings, like this:
var unusedStrings: [String] = ["king", "philip", "calls", "out", "for", "good", "soup"]
var usedStrings: [String] = []
func randomString() -> String {
if unusedStrings.isEmpty() {
unusedStrings = usedStrings
usedStrings = []
}
let randomIndex = Int(arc4random_uniform(unusedStrings.count))
let randomString = unusedStrings[randomIndex]
usedStrings.append(randomString)
return randomString
}
I have an array of Super Hero objects. I want to group the superheroes based on the name property into separated arrays and then count how many objects are in each individual separated array
Object:
class SuperHero{
var name: String?
var power: Bool?
}
Array of superheroes (there can be an infinite num of superheroes)
var superHeroes = [SuperHero]()
let superHero1 = SuperHero()
superHero1.name = "SuperMan"
superHero1.power = true
superHeroes.append(superHero1)
let superHero2 = SuperHero()
superHero2.name = "BatMan"
superHero2.power = true
superHeroes.append(superHero2)
let superHero3 = SuperHero()
superHero3.name = "BatMan"
superHero3.power = true
superHeroes.append(superHero3)
let superHero4 = SuperHero()
superHero4.name = "SuperMan"
superHero4.power = true
superHeroes.append(superHero4)
//etc...
Use name property to sort:
let sortedHeros = superHeroes.sort{$0.name < $1.name}
for hero in sortedHeros{
print(hero.name)
/*
prints
BatMan
BatMan
SuperMan
SuperMan
*/
}
How do I put the sorted array into separate arrays then print the count of each separated array?
//this is what I want
separatedArraysOfSuperHeroes = [[superHero2, superHero3], [superHero1, superHero4]]
//subscriprting isn't ideal because i'll never know the exact number of separated arrays
print(separatedArraysOfSuperHeroes[0].count)
print(separatedArraysOfSuperHeroes[1].count)
As per the comments the reason why I want sub arrays is because I want to use them to populate different tableview sections. For i.e. inside my tableview I would now have a 2 sections. The first section would have a header that says "Batman" with 2 Batman objects inside of it and the second section would have a header that says Superman with 2 Superman objects inside of it. The count property would show the number of super hero objects inside each section.
func getSeparatedArrayBasedOnName(superHeroes: [SuperHero]) -> [[SuperHero]] {
guard let superNames = NSOrderedSet.init(array: superHeroes.map { $0.name ?? "" }).array as? [String] else {
print("Something went wrong with conversion")
return [[SuperHero]]()
}
var filteredArray = [[SuperHero]]()
for superName in superNames {
let innerArray = superHeroes.filter({ return $0.name == superName })
filteredArray.append(innerArray)
}
for array in filteredArray {
for hero in array {
print(hero.name ?? "")
}
}
return filteredArray
}
Here is my code so far
var counter = 0
for i in 0...9 {
var val = NamePicker()
// array to find duplicates
var buttonValues = ["", "", "", "", "", "", "", "", "", ""] // array for button names
buttonValues.insert(val, at: counter)
print(buttonValues[counter])
counter += 1
}
This code is putting 10 string values into my array. What I would like to do is find a way to check each value in my array. for eample if my end result array is ["a","a","a","b","b","c","c","e","f","c"] I want to see if there is a triple of the same name(single and duplicates are fine). However if there is a triple I would like to change the 3rd value to another val from my NamePicker() function.
so with my array of
["a","a","a","b","b","c","c","e","f","c"]
there are 3 "a" and 3 "c", having two of the same is ok, i would like to change the 3rd to a new values and if the new value makes another triple it will change until there are no more triples.
so that array could possible have an end result of
["a","a","f","b","b","c","c","e","f","z"]
this is where the triples where changed.
Any help on how to do this efficiently?
Both options below asume that your NamePciker() function can generate at least 5 distinct values so there exists an array that satisfies your requirement.
Your requirement is better handled by not generating so many duplicates to begin with. If all you want is an array of names when each name cannot be repeated more than twice, try this:
var buttonValues = [String]()
var dict = [String: Int]()
while buttonValues.count < 10 {
let name = NamePicker()
let count = dict[name] ?? 0
guard count < 2 else { continue }
buttonValues.append(name)
dict[name] = count + 1
}
If you already have the array and want to correct it, do this:
var buttonValues = ["a","a","a","b","b","c","c","e","f","c"]
// Scan the array to tally how many times each name appears
var totalDict = [String: Int]()
buttonValues.forEach { totalDict[$0] = (totalDict[$0] ?? 0) + 1 }
// Now scan it again to update names that appear too many times
var runningDict = [String: Int]()
for (index, value) in buttonValues.enumerated() {
let count = runningDict[value] ?? 0
if count >= 2 {
while true {
let newValue = NamePicker()
let newTotal = (totalDict[newValue] ?? 0) + 1
if newTotal < 3 {
buttonValues[index] = newValue
totalDict[newValue] = newTotal
break
}
}
} else {
runningDict[value] = count + 1
}
}
Dictionary is the best way I think. Have the key be the character and the value be the count of that character. Your runtime will be O(n) since you only have to run through each input once. Here is an example:
let chars = ["a","a","a","b","b","c","c","e","f","c"]
var dict = [String: Int]()
for char in chars {
//If already in Dictionary, increase by one
if var count = dict[char] {
count += 1
dict[char] = count
} else {//else is not in the dictionary already, init with 1
dict[char] = 1
}
}
Output:
["b": 2, "e": 1, "a": 3, "f": 1, "c": 3]
Now I'm not sure how you want to replace the value that's the same character for a third time, but this is probably the best way to group the strings to determine which are over the limit.
Instead of inserting the wrong value and then checking if the values are correct, I would suggest to automatically create the correct array.
//array for button names
var buttonValues = Array<String>()
//tracks what value has been inserted how many times
var trackerDict = [String: Int]()
for i in 0...9 {
//we initialize a new variable that tells us if we found a valid value (if the value has not been inserted 2 times already)
var foundValidValue = false
while !foundValidValue{
var val = NamePicker()
//now we check if the value exists and if it is inserted less than 2 times
if let count = trackerDict[val] {
if count < 2 {
foundValidValue = true
}
}
//if we found the value, we can add it
if foundValidValue {
trackerDict[val] = (trackerDict[val] ?? 0) + 1
buttonValues.append(val)
}
//if we did not find it, we just run through the loop again
}
}
I added a dictionary because it is faster to keep track of the count in a dictionary than counting the number of occurrences in the array every time.
can someone help me
i make button to retrieve previous Values
but i have two TextFiled
i must write in two TextFiled for work retrieve button
i do not want this happens
i want when I write in the first TextFiled, retrieve button work without any problem
but if i write in first TextFiled and second TextFiled at the same time i want retrieve button work without any problem
var previousValues: [String] = [String]();
var previousValues1: [String] = [String]();
previousValues.append(TextFailde.text ?? "error");
previousValues1.append(TextFilde1.text ?? "error");
if self.previousValues.count > 0 {
let previousValue = self.previousValues.removeLast()
let subtracted = (Int(self.lblZeroUs.text!)!) - (Int(previousValue)!)
self.lblZeroUs.text = "\(subtracted)"
}
else if self.previousValues1.count > 0 {
let previousValue = self.previousValues1.removeLast()
let subtracted2 = (Int(self.lblZeroThey.text!)!) - (Int(previousValue)!)
self.lblZeroThey.text = "\(subtracted2)"
}
and here the error
There are many errors, first of all you dont declare your properties with the first letter in uppercase, it's considered a bad practice.
Then, when you involve your properties in mathematical operations what do you need is to assign them a start value, especially if your code try to convert strings.
In Swift, you don’t need to write semicolons at the end of every statement.
I dont know the rest of your code, but your lines crash because you attempt to run mathematical operations using properties have nil as value.
This below it's just an example to avoid the first crashing for nil:
textFailde.text = "0"
textFilde1.text = "0"
previousValues.append(textFailde.text ?? String(0))
previousValues1.append(textFilde1.text ?? String(0))
self.lblZeroUs.text = String(0)
self.lblZeroThey.text = String(0)
if self.previousValues.count > 0 {
let subtracted = (Int(self.lblZeroUs.text!)!) - (Int(self.previousValues.last!))!
self.previousValues.removeLast()
self.lblZeroUs.text = "\(subtracted)"
}
else if self.previousValues1.count > 0 {
let subtracted2 = (Int(self.lblZeroThey.text!)!) - (Int(self.previousValues1.last!))!
self.previousValues1.removeLast()
self.lblZeroThey.text = "\(subtracted2)"
}
previousValues.append(TextFailde.text ?? "error");
previousValues.append(TextFilde1.text ?? "error");
You added to the same array twice, try changing the code to
previousValues.append(TextFailde.text ?? "error");
previousValues1.append(TextFilde1.text ?? "error");