前言

利用属性进行传值的时候，我们就可以利用本文的方法进行动态创建属性。尤其在逆向其他app的时候，往已经存在class新增一个属性，用于数据传递，尤其是异步操作的时候。

// 最好一个对象只能设置一次值

code

WCNewCommitViewController+KNWCNewCommitViewControllerAssociatedObject.h

code

//  Created by devzkn on 06/09/2018.
//  Copyright © 2018 devzkn. All rights reserved.
//
  
#import "WCNewCommitViewController.h"
  
@interface NSObject (KNWCNewCommitViewControllerAssociatedObject)
//    isa (Class): NSKVONotifying_WCNewCommitViewController (isa, 0x5a10db2abf7)
@property (nonatomic, strong) id associatedObject;
@end
  

WCNewCommitViewController+KNWCNewCommitViewControllerAssociatedObject.m

code

//  Created by devzkn on 06/09/2018.
//  Copyright © 2018 devzkn. All rights reserved.
//
  
#import "WCNewCommitViewController+KNWCNewCommitViewControllerAssociatedObject.h"
  
@implementation NSObject (KNWCNewCommitViewControllerAssociatedObject)
  
@dynamic associatedObject;
- (void)setAssociatedObject:(id)object {
    objc_setAssociatedObject(self,
                             @selector(associatedObject), object,
                             OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (id)associatedObject {
    return objc_getAssociatedObject(self,
                                    @selector(associatedObject));
}
  
@end
  

效果

usage: #import "WCNewCommitViewController+KNWCNewCommitViewControllerAssociatedObject.h"
```
    [WCNewCommit setAssociatedObject:@"sssss"];
  
```

ret

        NSLog(@"associatedObject:%@",[self valueForKey:@"associatedObject"]);//2018-09-06 12:06:06.977711 WeChat[717:226743] associatedObject:sssss
  

AssociatedObject

动态创建属性：使用分类、@dynamic、objc_setAssociatedObject、objc_getAssociatedObject 进行实现

前言

code

WCNewCommitViewController+KNWCNewCommitViewControllerAssociatedObject.h

WCNewCommitViewController+KNWCNewCommitViewControllerAssociatedObject.m

效果

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