Convert CGFloat to NSNumber
I’m surprised how painful it is to do trivial things in Swift. 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? — Charles ___ 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
Re: Convert CGFloat to NSNumber
On 24 Feb 2015, at 18:57, Charles Jenkins 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
Re: Convert CGFloat to NSNumber
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. — Charles On February 24, 2015 at 7:45:22 AM, Roland King (r...@rols.org) wrote: On 24 Feb 2015, at 18:57, Charles Jenkins 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
Re: Convert CGFloat to NSNumber
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
Re: Convert CGFloat to NSNumber
On Feb 24, 2015, at 10:16 AM, Quincey Morris quinceymor...@rivergatesoftware.com wrote: The following work, too (Xcode 6.1.1): let f1: NSNumber = font.pointSize let f2 = font.pointSize as NSNumber ... (Things may have changed in Swift 1.2, though.) Works fine in 1.2, too. $ swift Welcome to Swift version 1.2. Type :help for assistance. 1 import Foundation 2 let f0: CGFloat = 42.0 f0: CGFloat = 42 3 let f1: NSNumber = f0 f1: NSNumber = Double(42) 4 let f2 = f0 as NSNumber f2: NSNumber = Double(42) Marc ___ 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
Re: Convert CGFloat to NSNumber
On Tue, Feb 24, 2015, at 04:57 AM, Charles Jenkins wrote: 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 ) You need to create either a Double or Float from the CGFloat before you can pass it to the NSNumber initializer: 1 let f: CGFloat = 2.0 f: CGFloat = 2 2 let p = NSNumber(double: Double(f)) p: NSNumber = Double(2) --Kyle ___ 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
Re: Convert CGFloat to NSNumber
On Feb 24, 2015, at 08:14 , 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. That’s not really what the quoted statement means. On Feb 24, 2015, at 09:02 , Kyle Sluder k...@ksluder.com wrote: You need to create either a Double or Float from the CGFloat before you can pass it to the NSNumber initializer: The following work, too (Xcode 6.1.1): let f1: NSNumber = font.pointSize let f2 = font.pointSize as NSNumber What’s going on here, I think, is that NSNumber (in Obj-C) does not have an initializer that takes a CGFloat parameter, only initializers for float and double, but it never mattered (in Obj-C) because CGFloat was one of the other types. This carries over to Swift, except that there CGFloat is a distinct type, rather than being one or other of float or double. AFAICT, the above forms work, not because there is an automatic conversion from CGFloat to double (let alone from CGFloat to NSNumber), but rather because CGFloat is FloatLiteralConvertible, and there are FloatLiteralConvertible variants of the ‘=‘ and ‘as’ operators. (Things may have changed in Swift 1.2, though.) ___ 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
