Agree, that we can already use some hacks(IMO) to have some kind of what we
need.
Actually, we already discussed some variants : method "with" in extension
to type and global generic function "with". Each of them has disadvantages
in compare to "with" language construction. In your example you need to
create temp instance, need "return", calls the block() - many noise for
simple action.
Also, such workarounds not always protect us from problems(like modifying
constant struct instance in generic "with" method - it compiles. but raise
runtime error) and each of us needs to move these workarounds from project
to project, plus we use different implementation for the "with" feature, no
standard, in one project with many developers we'll find different variants
for the same "with" feature.
I believe we need such language construction in some or another implementation.
I suggest these constructions:
// similar to "if let.. " and "guard let.."
with let questionLabel = UILabel() {
//...
}
with var some = SomeStruct() {
//...
}
with questionLabel {
// ..
}
And suggest to discuss these variants:
"one-point" (my preffered) :
with questionLabel {
.textAlignment = .Center
.font = UIFont(name:"DnealianManuscript", size: 72)
.text = "?"
.numberOfLines = 0
}
"two points":
with questionLabel {
..textAlignment = .Center
..font = UIFont(name:"DnealianManuscript", size: 72)
..text = "?"
..numberOfLines = 0
}
"$" sign :
with questionLabel {
$.textAlignment = .Center
$.font = UIFont(name:"DnealianManuscript", size: 72)
$.text = "?"
$.numberOfLines = 0
}
"$0" (don't think this is good, as there can not be $1 etc):
with questionLabel {
$0.textAlignment = .Center
$0.font = UIFont(name:"DnealianManuscript", size: 72)
$0.text = "?"
$0.numberOfLines = 0
}
Opinions?
On 14.04.2016 13:41, Milos Rankovic via swift-evolution wrote:
On 13 Apr 2016, at 17:04, Erica Sadun via swift-evolution
<[email protected] <mailto:[email protected]>> wrote:
The biggest advantage of thewithpattern IMO is Cocoa initializers. It
provides a more unified
initialization scope. Instead of:
letquestionLabel =UILabel()
questionLabel.textAlignment= .Center
questionLabel.font= UIFont(name:"DnealianManuscript", size:72)
questionLabel.text=currentQuestion.text
questionLabel.numberOfLines=0
Whilst I would not mind the `with` pattern, it’s worth noting that Swift
already has some very fine alternatives:
letquestionLabel: UILabel= {
let$ = UILabel()
$.textAlignment= .Center
$.font= UIFont(name:"DnealianManuscript", size: 72)
$.text= "?"
$.numberOfLines= 0
return$
}()
Including some lazy options:
private(set)lazyvarquestionLabel: UILabel= {...}()
staticletquestionLabel: UILabel= {...}()
milos
_______________________________________________
swift-evolution mailing list
[email protected]
https://lists.swift.org/mailman/listinfo/swift-evolution
_______________________________________________
swift-evolution mailing list
[email protected]
https://lists.swift.org/mailman/listinfo/swift-evolution
