swift – otz.li

September 30, 2018
in Swift
cwolf
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Swift 4: Validating a 13 digit ISBN

For a project I needed to validate a 13 digit ISBN. According to Wikipedia you can validate an ISBN by calculating the checksum, but more accurately calculating the check-digit of an ISBN as follows: The ISBN-13 check digit, which is the last digit of the ISBN, must range from 0 to 9 and must be […]

September 26, 2018
in Swift
cwolf
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Swift 4: An extension to define UIColors with “normal” RGB values and set some named colors

UIColors require you to enter red, green and blue as values between 0 and 1. In pracitcal terms that means you need to divide your values by 255 to obtain the CGFloat required. Easy enough? Surely! Still it is a tad annoying, especially as the rest of the world will give you RGB values between […]

September 25, 2018
in Swift
cwolf
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Swift 4: Pull To Refresh / UIRefreshControl

TableViews can have a useful feature to refresh the data inside of them, simply pull to refresh. Apple didn’t invent this, that was Loren Brichter of Tweetie, which was sold to Twitter and Twitter was eventually granted a Patent for the feature. Today this feature is absolutely ambiguous and very easy to implement. For example, […]

September 24, 2018
in Swift
cwolf
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Swift 4: JSON decoding with JSONDecoder() and structs

I have no apps in the app store, but a while ago I wrote an app for my own edutainment, which needed to parse JSON Data. At the time it was so darn complicated, that I enlisted Cocoapods and SwiftyJSON to help make things easier. SwiftJSON is pretty cool as it abstracts away a lot […]

September 22, 2018
in Swift
cwolf
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Swift 4: Convert Unix Timestamp to a nicely formatted Date & Time

I needed to convert a Unix Timestamp, which for some inexplicit reason was being returned as a String by an API I was using and this is the super foolish function I ended up with. I am not going to shame the API Provider for returning a timestamp as a String 😉

func createDateTime(timestamp: String) -> String {
    var strDate = "undefined"
        
    if let unixTime = Double(timestamp) {
        let date = Date(timeIntervalSince1970: unixTime)
        let dateFormatter = DateFormatter()
        let timezone = TimeZone.current.abbreviation() ?? "CET"  // get current TimeZone abbreviation or set to CET
        dateFormatter.timeZone = TimeZone(abbreviation: timezone) //Set timezone that you want
        dateFormatter.locale = NSLocale.current
        dateFormatter.dateFormat = "dd.MM.yyyy HH:mm" //Specify your format that you want
        strDate = dateFormatter.string(from: date)
    }
        
    return strDate
}

func createDateTime(timestamp: String) -> String {

var strDate = "undefined"

if let unixTime = Double(timestamp) {

let date = Date(timeIntervalSince1970: unixTime)

let dateFormatter = DateFormatter()

let timezone = TimeZone.current.abbreviation() ?? "CET" // get current TimeZone abbreviation or set to CET

dateFormatter.timeZone = TimeZone(abbreviation: timezone) //Set timezone that you want

dateFormatter.locale = NSLocale.current

dateFormatter.dateFormat = "dd.MM.yyyy HH:mm" //Specify your format that you want

strDate = dateFormatter.string(from: date)

}

return strDate

}