How to Initialize OpaquePointer in Swift

I want to use OpaquePointer in Swift. This is my Code.

@State var OP : OpaquePointer = OpaquePointer.init(bitPattern: <#T##Int#>)

In my Project, I use SwiftGit2 Library. And because of that, I must initialize the OpaquePointer.

It doesn't matter what way.

In addition, I put any bitPatter in the Parameter. And, here is the Error

@State var OP : OpaquePointer = OpaquePointer.init(bitPattern: 1)

Value of optional type 'OpaquePointer?' must be unwrapped to a value of type 'OpaquePointer'

Thank you.

Solution 1:

What the compile error is telling you is that the initialiser that takes a bit pattern returns an optional OpaquePointer.

So you either should use it as an optional:

@State var OP: OpaquePointer? = OpaquePointer(bitPattern: 1)

Or if you're a 100% certain the opaque pointer is never nil, you can force unwrap it:

@State var OP: OpaquePointer = OpaquePointer(bitPattern: 1)!

However, if the OpaquePointer fails to initialise, your app will crash.

Please note that a bitPattern of 1 will most certainly fail, since this should point to an address in memory.

A better way to get an OpaquePointer is to derive it from an UnsafePointer or UnsafeMutablePointer, so you're sure the pointer is actually pointing to the thing you want it to.

What are you trying to point to? And do you really need an OpaquePointer? If so, I'd highly advise to not mess with pointers inside your SwiftUI view, do this stuff in a (or multiple) layers 'above' that (so either ViewModel or Model/Data).