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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.
Related
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I want to convert this Swift code to Objective C. I searched and did not find a way to convert automatically . Is there any way that can help convert ?
let token="0000000009"
SkyIdConfig.shared.setup(With: token)
var skyIdView:SkyDocumentsAnalyzer?
SkyIdConfig.shared.loadAndConfigure(){[unowned self] isConfigured,error in
if error != nil || !isConfigured {
print(error?.localizedDescription ?? "Error !!!!")
return
}
DispatchQueue.main.async {[unowned self] in
self.skyIdView=SkyIdBuilder.shared.getDocumentAnalyzerInstance(with: "03", lang: "fra")
if self.skyIdView != nil
{
self.skyIdView!.delegate=self
self.skyIdView?.modalPresentationStyle = .fullScreen
self.present(self.skyIdView!, animated: true, completion: nil)
}else{
print("Error in config loading")
}
}
}
Of course there is a way to convert ..
..manually. Which is the best way to understand whats going on.
your token is probably an
NSString *token = #"0000000009";
depending on the Class definition you have to look up how SkyIdConfig is done..
//assuming its something like..
[[SkyIdConfig shared] setupWith:token];
SkyDocumentsAnalyzer *skyIdView = [[SkyDocumentsAnalyzer alloc] init];
[[SkyIdConfig shared] loadAndConfigure];
before going forward in code read more about dispatching in objective-c (aka c) here...
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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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I have the following object:
(rates)
{
EUR: "1"
RON: 4.5
USD: 1.3
.
.
.
n: INT/STRING
}
Is there any function that does this?
if you care about the index, you can use a 'traditional' for loop - although #Eric points out this will soon be completely removed
for var i = 0; i < rates.count; i++
{
let rate = rates[i]
// do stuff with rate
}
The enumerate approach looks like this
for (index, rate) in rates.enumerate()
{
print("Do stuff with \(rate) at position \(index)")
}
if you just need each object in turn it's a bit easier
for rate in rates
{
// do stuff with rate
}
Because it's a dictionary, no enumerate() required:
var aDictionary: [String: Float] = ["EUR": 1, "RON": 4.5,
"USD": 1.3]
for (index,item) in aDictionary{
print(index,item)
}
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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)