> On Aug 8, 2016, at 4:32 PM, Kevin Ballard <[email protected]> wrote:
>
> The documentation is wrong (for Swift).
>
> For file URLs, this method returns true/false without throwing an error (at
> least, if the file doesn't exist there's no error; I don't know if there are
> conditions that would cause an error to be returned).
>
> For non-file URLs this method throws an error.
>
> The bit about "For other URL types, false is returned" is written for Obj-C,
> where you can completely disregard the error. You can't disregard the error
> in Swift, so it doesn't apply (though you can use try? and treat a nil value
> the same as false)
In my testing, this does not appear to be correct; it actually seems to throw
an error in both cases. For a file URL pointing to a file that doesn’t exist,
it throws NSFileReadNoSuchFileError, and for an HTTP URL, it throws
NSFileNoSuchFileError. This further causes me to question the purpose of having
the method return a boolean.
Here’s the code:
import Foundation
let fileURL = URL(fileURLWithPath: "/asdfasdfasdf")
let httpURL = URL(string: "http://asdfasdfasdf.com/asdfasdfasdf";)!
do {
if try fileURL.checkResourceIsReachable() {
print("file URL is reachable")
} else {
print("file URL returned false")
}
} catch {
print("file URL threw error: \(error)")
}
do {
if try httpURL.checkResourceIsReachable() {
print("http URL is reachable")
} else {
print("http URL returned false")
}
} catch {
print("http URL threw error: \(error)")
}
And the output:
file URL threw error: Error Domain=NSCocoaErrorDomain Code=260 "The file
“asdfasdfasdf” couldn’t be opened because there is no such file."
UserInfo={NSURL=file:///asdfasdfasdf, NSFilePath=/asdfasdfasdf,
NSUnderlyingError=0x100903eb0 {Error Domain=NSPOSIXErrorDomain Code=2 "No such
file or directory"}}
http URL threw error: Error Domain=NSCocoaErrorDomain Code=4 "The file doesn’t
exist."
Program ended with exit code: 0
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