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How can I check if the string is base64 encoded in swift?
Input = "tNC6umcfBS/gelbo2VJF3i4LAhUKMp4oDHWN5KyYUTWeJIQKKYx6oAcQnGncIrPJNC1tUYMKV4kJQj3q9voIOrxc1n7FmRFvDXeRgWGNcGYO66dH3VjoEgF0oxZOpfzwSZKSv3Jm7Q=="
let base64Regex = "^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$"
let predicate = NSPredicate(format: "SELF MATCHES %#", base64Regex)
let result = predicate.evaluate(with: "InputString")
You can also try to decode using the built-in Data:
let inputString = "..."
let isBase64Encoded = Data(base64Encoded: inputString) != nil
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Input: 9(Wed).12(Dec).2020
Day and month are represented by one number
I need date formatter for above input date string
You can try
func getDateFrom(_ str:String) -> Date? {
let dayTimePeriodFormatter = DateFormatter()
dayTimePeriodFormatter.dateFormat = "dd(EEE).MM(MMM).yyyy"
let date = dayTimePeriodFormatter.date(from: str)
return date
}
and call it getDateFrom("9(Wed).12(Dec).2020")
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I need to check preconditions for proceeding a function in iOS/Swift.
Option 1:
guard let name = str["name"], let age = str["age"] else {
print("name/age missing")
return
}
Option 2:
guard let name = str["name"] else {
print("name missing")
return
}
guard let age = str["age"] else {
print("age missing")
return
}
Which option is recommended.
This is completely unrelated to Swift.
From a UI / UX perspective certainly the 2nd option since you can now point to the exact input field that is missing.
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I would like to validate an email textfield, to make sure that the only email it accepts ends only by (.edu) (ex: example#uwf.edu or example.students#uwf.edu). Anything else like (.com)(.co)(.net) or so are not acceptable.
Try this (Swift 2.0):
func endsWithEdu(str : String) -> Bool {
let regex = try! NSRegularExpression(pattern: "\\.edu$", options: [.CaseInsensitive])
return regex.numberOfMatchesInString(str, options: [], range: NSMakeRange(0, str.characters.count)) > 0
}
print(endsWithEdu("john#university.edu")) // true
print(endsWithEdu("john#university.com")) // false
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In swift ,I need to show “10月02日”**but not **"10月2日",how to transfer "2"to "02"?
Now ， i have wrote these codes,but it will show "2",but not "02":
var publishLastDate:NSDate = momentLast.created_on
println(publishLastDate)
componentsLast = NSCalendar.currentCalendar().components(NSCalendarUnit.CalendarUnitDay | NSCalendarUnit.CalendarUnitMonth | NSCalendarUnit.CalendarUnitYear, fromDate: publishLastDate)
lastDay = componentsLast.day
lastMonth = componentsLast.month
lastYear = componentsLast.year
It looks like you're grabbing the components and printing the string yourself. You can format it like so:
let string = String(format: "%02d月%02d日", lastMonth, lastDay)
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I'm trying to get the data from the UIDatePicker, for example the user picked a date as 7:15 PM
How do I get the data from that so I can manipulate and use it for some other function?
If you have any questions or need any clarifications please comment them down below.
Add a handler for your UIDatePicker like so:
yourDatePicker.addTarget(self, action: #selector(DatePickerViewController.handler(sender:)), for: UIControl.Event.valueChanged)
And then do something like this in your handler:
#objc func handler(sender: UIDatePicker) {
let timeFormatter = DateFormatter()
timeFormatter.timeStyle = DateFormatter.Style.short
var strDate = timeFormatter.string(from: yourDatePicker.date)
// do what you want to do with the string.
}