标签:add objc obj manage cto let pattern void unsafe
oc中的AssociationsManager在swift中也是可以实现的 使用方法请看下面一个例子
import UIKit
extension UIButton {
func fk_addAction(FKActionBlock:((UIButton)->Void)?){
//保存block
let key : UnsafeRawPointer! = UnsafeRawPointer.init(bitPattern: "fk_addAction:".hashValue)
objc_setAssociatedObject(self, key, FKActionBlock, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
addTarget(self, action: #selector(itemClick(button:)), for:.touchUpInside)
}
func fk_addAction(FKActionBlock:((UIButton)->Void)? ,for event:Event){
//保存block
let key : UnsafeRawPointer! = UnsafeRawPointer.init(bitPattern: "fk_addAction:".hashValue)
objc_setAssociatedObject(self, key, FKActionBlock, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
addTarget(self, action: #selector(itemClick(button:)), for:event)
}
@objc private func itemClick(button:UIButton){
let key : UnsafeRawPointer! = UnsafeRawPointer.init(bitPattern: "fk_addAction:".hashValue)
objc_getAssociatedObject(self, key)
if let fkBlock = objc_getAssociatedObject(self, key) as? ((UIButton)->Void){
fkBlock(button)
}
}
}
这里是给UIButton添加一个分类,在分类中给UIButton拓展快速添加点击事件的方法通过block回传,通过objc_setAssociatedObject将block保存,触发点击事件后,通过objc_getAssociatedObject获取之前保存的block发起回调
iOS swift objc_setAssociatedObject和objc_getAssociatedObject使用
标签:add objc obj manage cto let pattern void unsafe
原文地址:https://www.cnblogs.com/qqcc1388/p/9851663.html