CODEWITHSUNDEEP
swifttype-conversionintuint
Fakher Mokadem
Fakher Mokadem

Reputation: 1099

How to convert UInt to Int in swift?

I need to convert a variable from NSUInt to Int to pass it as argument to allocate.

I tried initializing with Int() but the compiler refuses cannot invoke initializer for type 'int' with an argument of type '(UInt?)'

this is the variable: NSUInteger count this is the call to allocatelet outPut = UnsafeMutablePointer<Float>.allocate(capacity: count)

Without the conversion the compiler generates this error: cannot convert value of type 'UInt?' to expected argument type 'Int'

Upvotes: 1

Views: 849

Answers (2)

Joakim Danielson
Joakim Danielson

Reputation: 51891

It's because it is optional, you need to unwrap it

var x: UInt?

if let z = x {
    let y = Int(exactly: z) 
}

Note that Int(exactly:) returns an optional as well so you might want to use a guard statement or another if let...

Update, as pointed out by vacawama Int(z) might crash

Upvotes: 2

Shreeram Bhat
Shreeram Bhat

Reputation: 3157

You need to use bit pattern initialiser.

let unsignedInt = Int(bitPattern: UInt)

But this will not take care overflow situations.

Upvotes: 0

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