swift3 Archives - IT Nursery

Programming, swift

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try, try! & try? what’s the difference, and when to use each?

In Swift 2.0, Apple introduced a new way to handle errors (do-try-catch). And few days ago in Beta 6 an even newer keyword ...

June 2, 2022
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ios, Programming

IT Nursery

Figure out size of UILabel based on String in Swift

I am trying to calculate the height of a UILabel based on different String lengths. func calculateContentHeight() -> CGFloat{ var maxLabelSize: CGSize = ...

May 29, 2022
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CGRectMake, CGPointMake, CGSizeMake, CGRectZero, CGPointZero is unavailable in Swift

After converting code to latest swift 3.0 I am shown this error. Also tell me solution for CGSize = CGSizeMake(0,0) static var frameAtStartOfPan: ...

May 22, 2022
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How do I dispatch_sync, dispatch_async, dispatch_after, etc in Swift 3, Swift 4, and beyond?

I have lots of code in Swift 2.x (or even 1.x) projects that looks like this: // Move to a background thread to ...

May 21, 2022
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Command Line Tool – Error – xcrun: error: unable to find utility “xcodebuild”, not a developer tool or in PATH

I am getting this error while building the SwiftJSON framework to the Some Xcode project through Carthage Dependency Manager. Sivaramaiahs-Mac-mini:GZipDemoApp vsoftMacmini5$ carthage update ...

May 21, 2022
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How to provide a localized description with an Error type in Swift?

I am defining a custom error type with Swift 3 syntax and I want to provide a user-friendly description of the error which ...

May 20, 2022
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What is the ‘open’ keyword in Swift?

The ObjectiveC.swift file from the standard library contains the following few lines of code around line 228: extension NSObject : Equatable, Hashable { ...

May 10, 2022
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How to program a delay in Swift 3

In earlier versions of Swift, one could create a delay with the following code: let time = dispatch_time(dispatch_time_t(DISPATCH_TIME_NOW), 4 * Int64(NSEC_PER_SEC)) dispatch_after(time, dispatch_get_main_queue()) ...

May 9, 2022
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How to create dispatch queue in Swift 3

In Swift 2, I was able to create queue with the following code: let concurrentQueue = dispatch_queue_create("com.swift3.imageQueue", DISPATCH_QUEUE_CONCURRENT) But this doesn’t compile in ...

May 7, 2022
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