SwiftUI List performance

I'm trying to get started creating a Photos extension for OS X. After changing UIViewController to NSViewController and UIImage to NSImage in the template, opening Photos, hitting Edit, I select my extension in the list of plugins, but then the extension crashes before viewDidLoad is called. This is logged:2015-06-28 12:30:23.927 extension[1911:678982] An uncaught exception was raised2015-06-28 12:30:23.927 extension[1911:678982] *** setObjectForKey: object cannot be nil (key: <__NSConcreteUUID 0x7fb993d1fe30> 04015FC0-C1BB-4DF8-A48F-7C89B4642AC2)What can I do to resolve this?

My app is displaying video on iOS, currently using AVSampleBufferDisplayLayer. Before video is shown on screen I need to add barrel distortion effect to it. How to do it efficiently? There is no easy way to manipulate CALayer contents without significant performance penalty. Requirement for video is 1920x1080 at 60 frames per second.First alternative was to use VTDecompressionSession instead of AVSampleBufferDisplayLayer and use OpenGL shaders for distortion. But it looks like reading frames back from GPU is quite slow, it takes 20-25 milliseconds per frame for decoding and reading the YUV data.Second alternative was using software video decoding and then OpenGL shaders. This is actually faster than using VTDecompressionSession but will kill the battery very quickly.Third alternative would to apply CIFilter to CALayer, but according to documentation this is not supported on iOS.Fourth approach would be to render to offscreen using UIView's renderInContext-method. Haven't tried this yet but it is prob

I have a 13 inch late 2011 macbook pro. will metal be supported by the intel 3000 hd???

Am I missing something here? I cannot see a reason that this would not compile...protocol StringValidationRule { func validate(string: String) throws -> Bool var errorType: StringValidationError { get } } extension Array where T: StringValidationRule { func validateEach(string: String, completion: (valid: Bool, error: StringValidationError?) -> ()) { for rule in self { do { try rule.validate(string) completion(valid: true, error: nil) } catch let error as StringValidationError { completion(valid: false, error: error) } catch { fatalError(Unexpected error type) } } } } var validationRules = ... validationRules.validateEach() { (valid, error) -> () in }Line 23 throws the following error:error: cannot invoke 'validateEach' with an argument list of type '(String, (_, _) -> ())'validationRules.validateEach() { (valid, error) -> () in

hi, I've just scratch installed iOS 9 on my 6plus, then I've sync'd with my iCloud account. Everything seems right but the contacts: I'm having maybe the half of the full contacts list I had before (it was 4.200 contacts).any idea why is this happening? thanks

Am I the only one that is a bit perplexed by the solution Apple has put in place for canOpenURL, how does adding the url schemes to a whitelist in your own application make sense? What is stopping Twitter from just adding the list of known custom URLs into their plist and continuing with their practice of using canOpenURL? It would probably make more sense for the app that is being queried to specify which apps should be allowed to query it, from a security standpoint, but I wouldn't advocate that either. I think Apple needs to come up with a better solution for the restriction on canOpenURL. I think at the very least an application that has the same Team ID as an application it wants to open should be allowed to do so without having to specify it in the whitelist.

here are the steps that I performed for resigning app:1) removing _CodeSignature from package2) replacing embedded.mobileprovision with Enterprise distribution provision profile.3) codesign with entitlements.plist fileAfter resigning app when I try to install on any device then it shows app grayed out.Is there anything I am missing?