This pair works pretty well, too, if you don’t mind free functions:
func with<T>(inout this: T, @noescape using: inout T->Void) { using(&this) }
func with<T>(this: T, @noescape using: T->Void) { using(this) }
It works either with classes or mutable structs if you call it correctly and
the type doesn’t matter.
l8r
Sean
> On Apr 13, 2016, at 9:17 AM, Radosław Pietruszewski via swift-evolution
> <[email protected]> wrote:
>
> It can be (more-or-less) solved in library code today:
>
> extension NSObjectProtocol {
> public func with(@noescape fn: Self -> Void) -> Self {
> fn(self)
> return self
> }
> }
>
> This way, you can do, on NSObjects:
>
> textLabel.with {
> $0.textAlignment = .Left
> $0.textColor = .darkTextColor()
> }
>
> I love this pattern.
>
> You can also make it a function to make it work with any value of any kind
> (it will then take form of `with(foo) { …}`).
>
> Ideally, if you could write a universal extension (something like `extension
> Any`), you could just add this behavior, with method syntax, to everything.
>
> — Radek
>
>> On 13 Apr 2016, at 15:15, 李海珍 via swift-evolution
>> <[email protected]> wrote:
>>
>> I recently learned some VBA and I found a very conveniently `with` statement.
>>
>> `with` statement can be helpful to set property for UIKit instance.
>>
>> for instance a UILabel instance `textLabel` ,with `with` statement we can
>> set UILabel property like this
>>
>>
>>
>> ```swift
>>
>> with textLabel{
>>
>> .textAlignment = .Left
>>
>> .textColor = UIColor.darkTextColor()
>>
>> .font = UIFont.systemFontOfSize(15)
>>
>> }
>>
>> ```
>>
>> _______________________________________________
>> 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
_______________________________________________
swift-evolution mailing list
[email protected]
https://lists.swift.org/mailman/listinfo/swift-evolution
