import Foundation
import UIKit
private var kpageParams = "pageParams"
extension UIViewController{
func getPageParams(){
self.pageParams = "关联属性"
print(self.pageParams)
}
var pageParams:NSString? {
get{
guard let size = objc_getAssociatedObject(self, &kpageParams) as? NSString else {
return nil
}
return size
}
set(newValue){
objc_setAssociatedObject(self, &kpageParams, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
typedef OBJC_ENUM(uintptr_t, objc_AssociationPolicy) {
OBJC_ASSOCIATION_ASSIGN = 0, /**< Specifies a weak reference to the associated object. */
OBJC_ASSOCIATION_RETAIN_NONATOMIC = 1, /**< Specifies a strong reference to the associated object. The association is not made atomically. */
OBJC_ASSOCIATION_COPY_NONATOMIC = 3, /**< Specifies that the associated object is copied. The association is not made atomically. */
OBJC_ASSOCIATION_RETAIN = 01401, /**< Specifies a strong reference to the associated object. The association is made atomically. */
OBJC_ASSOCIATION_COPY = 01403 /**< Specifies that the associated object is copied. The association is made atomically. */
};
https://www.jianshu.com/p/1feae48a5dda
网友评论