OC对象关联～objc_setAssociatedObject/objc_getAssociatedObject

首先引入<objc/runtime.h>的头文件

objc_setAssociatedObject  将一个对象与另一个对象相关联

objc_getAssociatedObject  取得关联的值 

#import <objc/runtime.h>

static char * const associativekey = "associativekey";

- (IBAction) buildAssociative
{
    objc_setAssociatedObject(obj_one, &associativekey, obj_two, OBJC_ASSOCIATION_RETAIN);
}

- (IBAction) getAssociativeValue
{
    id associativeObj = objc_getAssociatedObject(obj_one, &associativekey);
    self.textField.text = associativeObj;
}

- (IBAction) cutAssociative
{
    objc_setAssociatedObject(obj_one, &associativekey, nil, OBJC_ASSOCIATION_RETAIN);
    [self getAssociativeValue];
}

完整的项目链接：https://github.com/lizhongfu/AssociativeDemo

转载请保留，原文链接：http://write.blog.csdn.net/postedit/8784152

若发现有不合适或错误之处，还请批评指正，不胜感激。