關於Smart KeyPath - Chiao-Te, Ni

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請從這裡開始

範例： let keyPath = \UIView.frame
延後取值的特性
也可以用在非NSObject
KeyPath -> read only
WritableKeyPath -> read/write (for variable)
ReferenceWritableKeyPath -> read/write (for variable/constant, Class only)
* 系統會根據屬性(如frame 或是 width) 自動回傳不同的keyPath型別
- e.g. \UIView.frame.size -> ReferenceWritableKeyPath
- e.g. \UIView.frame.width -> KeyPath

* 實際應用範例：對array做extension  驗證物件得值是否符合預期

ticket.sorted(\.price, by: <)

hold check array

coding syle: Fluent interface

label.translatesAutoresizingMaskIntoConstraints = false
label.constraint(...).isactive = true

label
.setAnchor(\.widthanchor, ..., to: view.widthanchor)
.setAnchor(\.heightanchor, ..., to: view.heightanchor)

Fluent Builder
@dynamicMemberLookup

//java
Type variableName = new Type.builder()
    .a() -> return builder
    .b() -> return builder
    .build() -> 這邊才把實體new出來