iOS - 全屏滑动

取经地址

1.使用关联

关联是指把两个对象相互关联起来，使得其中的一个对象作为另一个对象的一部分。

使用关联，是基于关键字的，因此，我们可以为任意对象增加任意多的关联，但是关键字是唯一的。关联可以保证

被关联对象

在

关联对象

的整个生命周期都是可用的。

1.1 创建关联、获取被关联的关联对象、断开关联

使用Objective-C中的runtime.h中

1) 创建关联：objc_setAssociatedObject函数

/**
* 使用给出的关键字和关联策略来设置对象的关联值
*
* @param object       被关联对象、目标对象
* @param key          关键字
* @param value        关联对象，输入nil时候清除存在关联
* @param policy       关联策略
*/
void objc_setAssociatedObject(id object, const void *key, id value, objc_AssociationPolicy policy)

//*> objc_AssociationPolicy 关联策略枚举
typedef OBJC_ENUM(uintptr_t, objc_AssociationPolicy) {
OBJC_ASSOCIATION_ASSIGN = 0,
OBJC_ASSOCIATION_RETAIN_NONATOMIC = 1,
OBJC_ASSOCIATION_COPY_NONATOMIC = 3,
OBJC_ASSOCIATION_RETAIN = 01401,
OBJC_ASSOCIATION_COPY = 01403
};

2）获取关联：objc_getAssociatedObject函数

/**
* 通过关键字返回被关联对象的关联值
*
* @param object 被关联对象、目标对象
* @param key     关键字
*
* @return The value associated with the key \e key for \e object.
*/
id objc_getAssociatedObject(id object, const void *key)

3）断开关联：objc_removeAssociatedObjects函数

/**
* 移除被关联对象的所有关联
*
* @param object 被关联对象、目标对象
*
* @note The main purpose of this function is to make it easy to return an object
*  to a "pristine state”. You should not use this function for general removal of
*  associations from objects, since it also removes associations that other clients
*  may have added to the object. Typically you should use \c objc_setAssociatedObject
*  with a nil value to clear an association.
*/

1.2创建关联的测试代码

static const char * associatedKeyMyname        = "_associated_key_myName";
static const char * associatiedKeyPersonalInfo = "_associated_key_personalinfomation";

//*> 关联对象
- (void)AssociationApiTest
{
//*> 把array关联到tempstring - 观察作用域
NSDictionary * infoDic  = @{@"Name":@"吕洪阳",@"Age":@"23",@"Gender":@"Male"};
NSString     * infoNote = @"Personal information";
objc_setAssociatedObject(infoNote, associatiedKeyPersonalInfo, infoDic, OBJC_ASSOCIATION_RETAIN);

NSDictionary * associatedInfoDic   = (NSDictionary *)objc_getAssociatedObject(infoNote, associatiedKeyPersonalInfo);
NSLog(@"\n%@%@",infoNote,associatedInfoDic);

//*> 把_myName关联到self - 观察作用域
_myName = @"吕洪阳";
objc_setAssociatedObject(self, associatedKeyMyname, _myName, OBJC_ASSOCIATION_RETAIN);

NSNumber * associatedName1 = (NSNumber *)objc_getAssociatedObject(self, associatedKeyMyname);
_myName = @"Steven Jobs";
NSNumber * associatedName2 = (NSNumber *)objc_getAssociatedObject(self, associatedKeyMyname);\

NSLog(@"关联姓名之后：%@",associatedName1);
NSLog(@"关联姓名修改：%@",associatedName2);//*> 关联的name没有因为关联对象的值而发成改变！
}

//*> 打印结果：
/*
2016-04-16 22:10:20.778 AssociatedDemo[2648:1100881]
Personal information{
Age = 23;
Gender = Male;
Name = "\U5415\U6d2a\U9633";
}
2016-04-16 22:10:20.779 AssociatedDemo[2648:1100881] 关联姓名之后：吕洪阳
2016-04-16 22:10:20.779 AssociatedDemo[2648:1100881] 关联姓名修改：吕洪阳
*/

2.全屏滑动POP代码

我的测试代码多多指教