> On 25 Feb 2015, at 00:14, Charles Jenkins <cejw...@gmail.com> wrote: > > A structure?!? I did look it up in the documentation, and all I found was > “the basic type for all floating-point values.” That the basis of all > floating-point types could be a structure never occurred to me. Thanks! > > Swift is a language I want to like, but currently it makes the easy stuff > hard without making the hard stuff any easier. > > —
Well it’s a swift structure, which doesn’t really mean much more than it’s an object with copy semantics. It has a TypeAlias for double which is where it stores the value. So it’s a structure, but not possibly in the way you would naturally infer. I should have been clearer. Anyway if you type var xx : CGFloat and then Cmd-Right-Click on the CGFloat you’ll see what it is and where I got the nativevalue thing from. > > Charles > > On February 24, 2015 at 7:45:22 AM, Roland King (r...@rols.org > <mailto:r...@rols.org>) wrote: > >> >>> On 24 Feb 2015, at 18:57, Charles Jenkins <cejw...@gmail.com >>> <mailto:cejw...@gmail.com>> wrote: >>> >>> I’m surprised how painful it is to do trivial things in Swift. >> >> I’ve stopped being surprised at this. >> >> >> Between the anal type checking and the spew of optionals I spend all my >> time fiddling around trying to get a ‘?’ in the right place or splitting >> lines up >> >> into >> >> individual >> >> expressions >> >> so that I >> >> can check the >> >> type >> >> of >> >> each line >> >> I’m hoping the improved error checking in the latest Swift 1.2 beta is going >> to help with this, but that version is currently buggy enough it crashes on >> my example code so I’m waiting for some of those bugs to get fixed before I >> try Swift again in earnest. >> >> >>> All I want to do is convert NSFont.pointSize to an NSNumber, but I can’t >>> figure out any syntax the Swift compiler will accept. >>> >>> My latest fruitless attempt has involved trying to simply cast the value >>> into something for which NSNumber has a corresponding init(): >>> >>> let size:Float = font.pointSize as Float >>> let points = NSNumber( float: size ) >>> >>> Neither Float nor Double works. What the heck is a Swift CGFloat that >>> seemingly makes it incompatible with everything else? >> >> It’s a structure. Cmd-RightClick is your friend here. >> >> I ended up with this piece of slightly non-obvious code, there’s probably >> three other ways to do it. >> >> import Cocoa >> >> let font = NSFont(name: "Helvetica", size: 29 ); >> let rs = NSNumber( double: font!.pointSize.native ) >> >> An example of the ‘fiddling about’ I was talking about, before I got to >> those lines, I thought I’d just check I had made the font I wanted by >> constructing an NSAttributedString with it, I had this >> >> let str = NSAttributedString(string: "test string", attributes: [ >> NSFontAttributeName : font ] ) >> >> which gives an error message that there isn’t an initializer which accepts >> string: String, attributes : [ String, NSFont? ]. I split the line up to >> construct the attributes separately and defined it to be [ NSObject : >> AnyObject ] (which is what that initializer takes) and eventually stumbled >> on the realization I had to unwrap font in order for it to work. I spent a >> month nearly doing nothing but Swift and I never really got much better at >> it. Perhaps I’m too ancient and my brain is wired up wrong from years of C >> but I don’t find Swift an easy language to use at all and spend lots of >> unproductive time trying to sort out silly things like the above. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
