前面为了方便 给视图添加多状态操作, 是通过继承的方式添加属性来操作的.
这样的缺点是不得不为每一个空间都要写一个控件写一个子类.
后面通过参照rxswift, 来给所有的view 添加多状态操作.
主要也是先通过给view 添加一个 jl 的命名空间, 然后再通过运行时, 为 view 关联一个block.
设置状态时, 再调用关联的block.
Demo
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| extension JLSpace where Base: UIView {
func setStatBlock<E>(defaultValue: E, block: @escaping (Base, E) -> ()) {
typealias STATBE = STAT<Base, E>
let stat = STATBE(e: defaultValue, block: block)
objc_setAssociatedObject(self.base, &AssociatedKeys.statKey, stat, .OBJC_ASSOCIATION_RETAIN)
block(self.base, defaultValue)
}
func setStat<E>(e: E) {
typealias STATBE = STAT<Base, E>
if var stat = objc_getAssociatedObject(self.base, &AssociatedKeys.statKey) as? STATBE {
stat.block?(self.base, e)
stat.e = e
objc_setAssociatedObject(self.base, &AssociatedKeys.statKey, stat, .OBJC_ASSOCIATION_RETAIN)
}
}
func getStat<E>() -> E? {
if let statBlock = objc_getAssociatedObject(self.base, &AssociatedKeys.statKey) as? STAT<Base, E> {
return statBlock.e
}
return nil
}
}
struct STAT<Base, E> {
typealias STATBLOCK = (Base, E) -> ()
var block: STATBLOCK?
var e: E?
init(e: E?, block: STATBLOCK?) {
self.block = block
self.e = e
}
}
|