Im doing a watch app for the Apple Watch in Xcode and the sample code from the Apple Developer site SpeedySloth: Creating a Workout has the HeartRate rounded to one decimal place, e.g. 61.0
How can I fix this?
case HKQuantityType.quantityType(forIdentifier: .heartRate):
/// - Tag: SetLabel
let heartRateUnit = HKUnit.count().unitDivided(by: HKUnit.minute())
let value = statistics.mostRecentQuantity()?.doubleValue(for: heartRateUnit)
let roundedValue = Double( round( 1 * value! ) / 1 )
label.setText("\(roundedValue) BPM")
I tried changing both the 1's in there to 0 but that gave me a 6.1 BPM or a 0.0 BPM
Thanks
A simple solution is to round to an integer and show the integer.
let value = // ... some Double ...
let s = String(Int(value.rounded(.toNearestOrAwayFromZero)))
label.setText(s + " BPM")
Properly, however, you should put formatting a string based on a number into the hands of a NumberFormatter. That's its job: to format a number.
let i = value.rounded(.toNearestOrAwayFromZero)
let nf = NumberFormatter()
nf.numberStyle = .none
let s = nf.string(from: i as NSNumber)!
// ... and now show the string
Related
I'm having an issue where I am getting a list of skills back from an api and I want them to stack one on top of the other in two different sections, a left column and a right column. It works well but if the skill is longer than the width of the label it drops to a new line with the same spacing as the rest of the labels. The skill Adobe Creative Suite looks like Adobe Creative as one and Suite as another. I would like Suite to be underneath Adobe Creative but much closer so you can tell it's all one skill.
My code is here:
lblLeft.text = ""
lblRight.text = ""
if let expertiseCount = helper.expertise {
for i in 0..<expertiseCount.count {
if i % 2 == 0 {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 10
let attrString = NSMutableAttributedString(string: lblLeft.text! + "\(expertiseCount[i].name ?? "")\n")
attrString.addAttribute(NSParagraphStyleAttributeName, value:paragraphStyle, range: NSMakeRange(0, attrString.length))
lblLeft.attributedText = attrString
} else {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 10
let attrString = NSMutableAttributedString(string: lblRight.text! + "\(expertiseCount[i].name ?? "")\n")
attrString.addAttribute(NSParagraphStyleAttributeName, value:paragraphStyle, range: NSMakeRange(0, attrString.length))
lblRight.attributedText = attrString
}
}
}
I've already tried line spacing and that just changes the size between all lines so the space between Adobe Creative and Suite takes on that change as well.
Try:
lblLeft.numberOfLines = 0
lblLeft.lineBreakMode = .byWordWrapping
lblLeft.sizeToFit()
By setting number of lines to zero and turning word wrapping on, the label will grow to the required number of lines. sizeToFit() should size it properly.
I want to print, e.g., the value 1.5 as "1.5 sec", like Safari's timeline does, and I'm trying to use DateComponentsFormatter for it.
Unfortunately, its .allowedUnits only goes down to .second (even though the enum has .nanosecond). I tried setting .allowsFractionalUnits = true, but I'm still getting "0 sec".
Is there any way to get fractional seconds out of DateComponentsFormatter?
For positional units style, DateComponentsFormatter can be used together with NumberFormatter to get locale-aware string.
func format(_ seconds: TimeInterval) -> String {
let components = DateComponentsFormatter()
components.allowedUnits = [.minute, .second]
components.allowsFractionalUnits = true // does not work as expected
components.unitsStyle = .positional
components.zeroFormattingBehavior = .pad
let fraction = NumberFormatter()
fraction.maximumIntegerDigits = 0
fraction.minimumFractionDigits = 0
fraction.maximumFractionDigits = 3
fraction.alwaysShowsDecimalSeparator = false
let fractionalPart = NSNumber(value: seconds.truncatingRemainder(dividingBy: 1))
return components.string(from: seconds)! + fraction.string(from: fractionalPart)!
}
print(Locale.current) // ru_RU (current)
print(format(600.5)) // 10:00,5 <- note locale specific decimal separator
Unfortunately, using this method for other date styles is even more hacky.
so i'm trying to implement a simple english to farsi dictionary in iOS
i'd like to include both words in one table cell, problem is that english is L>R and farsi is R>L, also i'd like to make the farsi word a bit bigger.
I created an AttributedMutableString and I thought I put down all the correct values but it looks like there is a problem since it isn't rendering correctly.
code:
cell.textLabel?.numberOfLines = 0
var myString = "\(englishConvo[indexPath.row])\n\(farsiConvo[indexPath.row])"
var mutableString = NSMutableAttributedString()
var lenOfLang1 = englishConvo[indexPath.row].characters.count
var lenOfLang2 = farsiConvo[indexPath.row].characters.count
let increaseFontSize = UIFont(name: (cell.textLabel?.font.fontName)!, size: (cell.textLabel?.font?.pointSize)! + 5)
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = NSTextAlignment.Right
mutableString = NSMutableAttributedString(string: myString)
mutableString.addAttribute(NSParagraphStyleAttributeName, value: paragraphStyle, range: NSRange(location: lenOfLang1 + 1, length: lenOfLang2))
mutableString.addAttribute(NSFontAttributeName, value: increaseFontSize!, range: NSRange(location: lenOfLang1 + 1, length: lenOfLang2))
cell.textLabel?.attributedText = mutableString
If i convert to a string using this code this is what I get
cell.textLabel?.text = String(mutableString)
Any thoughts / ideas would be super appreciated
Table cells already come with a layout that gives you two labels (text and detail), so why not just use it? Here, for example, in a language app of mine, I'm displaying a Latin word in the text label and an English translation in the detail label. You could easily do the same with Farsi and English.
I am currently storing time in seconds (for example 70.149 seconds). How would I easily get the minutes and seconds? What I mean is 70.149 seconds is 1min and 10sec. How would I be able to do this easily in swift?
Here is an example of what I want to do.
let time:Double = 70.149 //This can be any value
let mins:Int = time.minutes //In this case it would be 1
let secs:Int = time.seconds //And this would be 10
How would I do this using Swift 2 OS X (not iOS)
Something like this:
let temp:Int = Int(time + 0.5) // Rounding
let mins:Int = temp / 60
let secs:Int = temp % 60
This would be a relatively simple solution. It's worth noting this would truncate partial seconds. You'd have to use floating point math on the third line and call trunc()/ceil()/floor() on the result before conversion to an Int if you wanted control over that.
let time:Double = 70.149 //This can be any value
let mins:Int = Int(time) / 60 //In this case it would be 1
let secs:Int = Int(time - Double(mins * 60)) //And this would be 10
Swift 5
The date components formatter has lots of advantages when displaying human readable text to a user. This function will take a double.
func humanReadable(time:Double) -> String {
let formatter = DateComponentsFormatter()
formatter.allowedUnits = [.hour, .minute, .second]
formatter.unitsStyle = .full
if let str = formatter.string(from: time) {
return str
}
return "" // empty string if number fails
}
// will output '1 minute, 10 seconds' for 70.149
I just downloaded the XCode 7 GM seed. It complains about the join method on String. How do I use joinWithSeparator instead of join?
//1
// Create an `NSCharacterSet` set which includes everything *but* the digits
let inverseSet = NSCharacterSet(charactersInString:"0123456789").invertedSet
//2
// At every character in this "inverseSet" contained in the string,
// split the string up into components which exclude the characters
// in this inverse set
let components = string.componentsSeparatedByCharactersInSet(inverseSet)
//3
// Rejoin these components
let filtered = "".join(components)
Soon after I figured it out, in case you are stuck on the same problem.
replace 3rd step with the line below
let filtered = components.joinWithSeparator("")
let inverseSet =
NSCharacterSet(charactersInString:"0123456789+").invertedSet
let components = string.componentsSeparatedByCharactersInSet(inverseSet)
//let filtered = join("", components)
let filtered = components.joinWithSeparator("") //swift2.0change