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Re: Value of type '[AnyObject]!' has no member 'Generator'
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Re: Value of type '[AnyObject]!' has no member 'Generator'


  • Subject: Re: Value of type '[AnyObject]!' has no member 'Generator'
  • From: Roland King <email@hidden>
  • Date: Sun, 04 Oct 2015 14:03:28 +0800

> On 4 Oct 2015, at 13:48, Rick Mann <email@hidden> wrote:
>
> Why won't this compile?
>
> let devices = AVCaptureDevice.devices()		// OKAY
> for device in devices
> {
> 	print("Device: \(device)")
>
> 	for f in device.formats			// no member "Generator"
> 	{
> 		print("  format: \(f)")
> 	}
> }
>
> Each of the loops' collections is of type [AnyObject]! But for the device.formats, I get
>
> 	AppDelegate.swift:25:13: Value of type '[AnyObject]!' has no member 'Generator'
>
> Also, command-clicking on device() takes me to a Swift interface file. Command-clicking on formats takes me to an Objective-C header.
>
> If I put a ! after device.formats, it compiles.
>
> --
> Rick Mann
> email@hidden
>


Apply the usual swift technique and break it down into more than one line then go look at the types of each variable.

let ff = device.formats
let pp = ff!

option-click on each of those variables and you’ll quickly see the ‘!!’ on the first one and hence why you have to explicitly unwrap it to get it into a [AnyObject] which has a generator.
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