> Le 14 avr. 2016 à 09:49, Vladimir.S via swift-evolution
> <[email protected]> a écrit :
>
> 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
> }
>
Thought with a free standing 'with' the next request to come in, could be to be
able to do something like:
with source, destination {
$1.something = $0.somethingSimilar
$1.x = $0.bound.left
$1.y = $0.point.top
}
So using $0, may be a future proofing option.
Dany
>
> On 14.04.2016 13:41, Milos Rankovic via swift-evolution wrote:
>>> On 13 Apr 2016, at 17:04, Erica Sadun via swift-evolution
>>> <[email protected] <mailto:[email protected]>> wrote:
>>>
>>> The biggest advantage of thewithpattern IMO is Cocoa initializers. It
>>> provides a more unified
>>> initialization scope. Instead of:
>>>
>>> letquestionLabel =UILabel()
>>> questionLabel.textAlignment= .Center
>>> questionLabel.font= UIFont(name:"DnealianManuscript", size:72)
>>> questionLabel.text=currentQuestion.text
>>> questionLabel.numberOfLines=0
>>
>> Whilst I would not mind the `with` pattern, it’s worth noting that Swift
>> already has some very fine alternatives:
>>
>> letquestionLabel: UILabel= {
>> let$ = UILabel()
>> $.textAlignment= .Center
>> $.font= UIFont(name:"DnealianManuscript", size: 72)
>> $.text= "?"
>> $.numberOfLines= 0
>> return$
>> }()
>>
>>
>> Including some lazy options:
>>
>>
>> private(set)lazyvarquestionLabel: UILabel= {...}()
>>
>>
>> staticletquestionLabel: UILabel= {...}()
>>
>> milos
>>
>>
>>
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