How do I remove optional text from UILabel - ios

Question

I'm trying to remove the Optional text on my UILabel when I run the app. However, I already tried many ways and the Optional persists.
It's important to say that I got these values from JSON, so I created a Struct to decode all this Data. The property ibu is the only one that has Optional written, but if I remove the ? I got an error on JSONDecoder that say's:
Swift.DecodingError.Context(codingPath: [_JSONKey(stringValue: "Index
23", intValue: 23), CodingKeys(stringValue: "ibu", intValue: nil)],
debugDescription: "Expected Double value but found null instead.",
underlyingError: nil))
How do I fix that?
App Picture:
Model Folder:
struct Cerveja:Decodable{
let name:String
let image_url:String
let description:String
let tagline:String
let abv:Double
let ibu:Double? //This one that I got the "Optional" written in the UILabel
//If I remove the "?" I got the error below
}
View Folder - Details Screen:
var item:Cerveja?
override func viewDidLoad() {
super.viewDidLoad()
labelName.text = item?.name
labelDescricao.text = item?.description
labelAmargor.text = "\(String(describing: item!.ibu))"
labelTeorAlc.text = "\(item!.abv)"
let resource = ImageResource(downloadURL: URL(string: "\(item?.image_url ?? "")")!, cacheKey: item?.image_url)
imageDetail.kf.setImage(with: resource)
}
Networking Folder:
func getApiData(completion: #escaping ([Cerveja]) -> ()){
guard let urlString = URL(string: "https://api.punkapi.com/v2/beers") else {
print("URL Error")
return
}
Alamofire.request(urlString).responseJSON { response in
if response.data == response.data{
do{
let decoder = try JSONDecoder().decode([Cerveja].self, from: response.data!)
completion(decoder)
}catch{
print(error)
}
}else{print("API Response is Empty")}
}
}
JSON:
[
{
"id": 1,
"name": "Buzz",
"tagline": "A Real Bitter Experience.",
"first_brewed": "09\/2007",
"description": "A light, crisp and bitter IPA brewed with English and American hops. A small batch brewed only once.",
"image_url": "https:\/\/images.punkapi.com\/v2\/keg.png",
"abv": 4.5,
"ibu": 60,
"target_fg": 1010,
"target_og": 1044,
"ebc": 20,
"srm": 10,
"ph": 4.4,
"attenuation_level": 75,
"volume": {
"value": 20,
"unit": "liters"
},
"boil_volume": {
"value": 25,
"unit": "liters"
},
"method": {
"mash_temp": [
{
"temp": {
"value": 64,
"unit": "celsius"
},
"duration": 75
}
],
"fermentation": {
"temp": {
"value": 19,
"unit": "celsius"
}
},
"twist": null
},
"ingredients": {
"malt": [
{
"name": "Maris Otter Extra Pale",
"amount": {
"value": 3.3,
"unit": "kilograms"
}
},
{
"name": "Caramalt",
"amount": {
"value": 0.2,
"unit": "kilograms"
}
},
{
"name": "Munich",
"amount": {
"value": 0.4,
"unit": "kilograms"
}
}
],
"hops": [
{
"name": "Fuggles",
"amount": {
"value": 25,
"unit": "grams"
},
"add": "start",
"attribute": "bitter"
},
{
"name": "First Gold",
"amount": {
"value": 25,
"unit": "grams"
},
"add": "start",
"attribute": "bitter"
},
{
"name": "Fuggles",
"amount": {
"value": 37.5,
"unit": "grams"
},
"add": "middle",
"attribute": "flavour"
},
{
"name": "First Gold",
"amount": {
"value": 37.5,
"unit": "grams"
},
"add": "middle",
"attribute": "flavour"
},
{
"name": "Cascade",
"amount": {
"value": 37.5,
"unit": "grams"
},
"add": "end",
"attribute": "flavour"
}
],
"yeast": "Wyeast 1056 - American Ale\u2122"
},
"food_pairing": [
"Spicy chicken tikka masala",
"Grilled chicken quesadilla",
"Caramel toffee cake"
],
"brewers_tips": "The earthy and floral aromas from the hops can be overpowering. Drop a little Cascade in at the end of the boil to lift the profile with a bit of citrus.",
"contributed_by": "Sam Mason <samjbmason>"
},
{
"id": 2,
"name": "Trashy Blonde",
"tagline": "You Know You Shouldn't",
"first_brewed": "04\/2008",
"description": "A titillating, neurotic, peroxide punk of a Pale Ale. Combining attitude, style, substance, and a little bit of low self esteem for good measure; what would your mother say? The seductive lure of the sassy passion fruit hop proves too much to resist. All that is even before we get onto the fact that there are no additives, preservatives, pasteurization or strings attached. All wrapped up with the customary BrewDog bite and imaginative twist.",
"image_url": "https:\/\/images.punkapi.com\/v2\/2.png",
"abv": 4.1,
"ibu": 41.5,
"target_fg": 1010,
"target_og": 1041.7,
"ebc": 15,
"srm": 15,
"ph": 4.4,
"attenuation_level": 76,
"volume": {
"value": 20,
"unit": "liters"
},
"boil_volume": {
"value": 25,
"unit": "liters"
},
"method": {
"mash_temp": [
{
"temp": {
"value": 69,
"unit": "celsius"
},
"duration": null
}
],
"fermentation": {
"temp": {
"value": 18,
"unit": "celsius"
}
},
"twist": null
},
"ingredients": {
"malt": [
{
"name": "Maris Otter Extra Pale",
"amount": {
"value": 3.25,
"unit": "kilograms"
}
},
{
"name": "Caramalt",
"amount": {
"value": 0.2,
"unit": "kilograms"
}
},
{
"name": "Munich",
"amount": {
"value": 0.4,
"unit": "kilograms"
}
}
],
"hops": [
{
"name": "Amarillo",
"amount": {
"value": 13.8,
"unit": "grams"
},
"add": "start",
"attribute": "bitter"
},
{
"name": "Simcoe",
"amount": {
"value": 13.8,
"unit": "grams"
},
"add": "start",
"attribute": "bitter"
},
{
"name": "Amarillo",
"amount": {
"value": 26.3,
"unit": "grams"
},
"add": "end",
"attribute": "flavour"
},
{
"name": "Motueka",
"amount": {
"value": 18.8,
"unit": "grams"
},
"add": "end",
"attribute": "flavour"
}
],
"yeast": "Wyeast 1056 - American Ale\u2122"
},
"food_pairing": [
"Fresh crab with lemon",
"Garlic butter dipping sauce",
"Goats cheese salad",
"Creamy lemon bar doused in powdered sugar"
],
"brewers_tips": "Be careful not to collect too much wort from the mash. Once the sugars are all washed out there are some very unpleasant grainy tasting compounds that can be extracted into the wort.",
"contributed_by": "Sam Mason <samjbmason>"
},
{
"id": 3,
"name": "Berliner Weisse With Yuzu - B-Sides",
"tagline": "Japanese Citrus Berliner Weisse.",
"first_brewed": "11\/2015",
"description": "Japanese citrus fruit intensifies the sour nature of this German classic.",
"image_url": "https:\/\/images.punkapi.com\/v2\/keg.png",
"abv": 4.2,
"ibu": 8,
"target_fg": 1007,
"target_og": 1040,
"ebc": 8,
"srm": 4,
"ph": 3.2,
"attenuation_level": 83,
"volume": {
"value": 20,
"unit": "liters"
},
"boil_volume": {
"value": 25,
"unit": "liters"
},
"method": {
"mash_temp": [
{
"temp": {
"value": 60,
"unit": "celsius"
},
"duration": 10
},
{
"temp": {
"value": 65,
"unit": "celsius"
},
"duration": 30
},
{
"temp": {
"value": 72,
"unit": "celsius"
},
"duration": 10
},
{
"temp": {
"value": 78,
"unit": "celsius"
},
"duration": 5
}
],
"fermentation": {
"temp": {
"value": 21,
"unit": "celsius"
}
},
"twist": "Soured naturally using the kettle souring technique, Yuzu fruit: 50g at middle, Yuzu juice: 200ml at FV"
},
"ingredients": {
"malt": [
{
"name": "Propino Pale Malt",
"amount": {
"value": 1.63,
"unit": "kilograms"
}
},
{
"name": "Wheat Malt",
"amount": {
"value": 1.63,
"unit": "kilograms"
}
},
{
"name": "Propino Pale Malt for kettle 0.03kg souring",
"amount": {
"value": 0.03,
"unit": "kilograms"
}
},
{
"name": "Acidulated Malt for kettle souring",
"amount": {
"value": 0.03,
"unit": "kilograms"
}
}
],
"hops": [
{
"name": "Bramling Cross",
"amount": {
"value": 10,
"unit": "grams"
},
"add": "middle",
"attribute": "bitter"
}
],
"yeast": "Wyeast 1056 - American Ale\u2122"
}

Answer 1

Use optional binding to avoid this problem
Use
if let ibu = item?.ibu {
labelAmargor.text = "\(String(describing: ibu))"
}
Instead of
labelAmargor.text = "\(String(describing: item!.ibu))"

Answer 2

I would recommend Nil-Coalescing Operator ( ?? ). You can find detailed info here
class Test {
var ibu: Double?
}
var tt: Test? = Test()
tt?.ibu = 3.14
print(String(describing: tt?.ibu)) // Optional("3.14")
print(tt?.ibu ?? 0) // 3.14
tt?.ibu = nil
print(String(describing: tt?.ibu)) // nil
print(tt?.ibu ?? 0) // 0