in Objective-C this works fine
Can't compile this in Swift
Or
ALAuthorizationStatus definition in IOS SDK
enum ALAuthorizationStatus : Int {
case NotDetermined // User has not yet made a choice with regards to this application
case Restricted // This application is not authorized to access photo data.
// The user cannot change this application’s status, possibly due to active restrictions
// such as parental controls being in place.
case Denied // User has explicitly denied this application access to photos data.
case Authorized // User has authorized this application to access photos data.
}
The comparison operator ==
returns a Bool
, not Boolean
. The following compiles:
func isAuthorized() -> Bool {
let status = ALAssetsLibrary.authorizationStatus()
return status == ALAuthorizationStatus.Authorized
}
(Personally, I find the error messages from the Swift compiler sometimes confusing. In this case, the problem was not the arguments of ==
, but the incorrect return type.)
Actually, the following should also compile due to the automatic type inference:
func isAuthorized() -> Bool {
let status = ALAssetsLibrary.authorizationStatus()
return status == .Authorized
}
But it fails with the compiler error "Could not find member 'Authorized'" , unless you explicitly specify the type of the status
variable:
func isAuthorized() -> Bool {
let status:ALAuthorizationStatus = ALAssetsLibrary.authorizationStatus()
return status == .Authorized
}
This could be a bug in the current Swift compiler (tested with Xcode 6 beta 1).
Update: The first version now compiles in Xcode 6.1.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.