1. 管理复杂页面的按钮点击事件
2. 管理复杂页面的按钮点击事件（二）
3. 管理复杂页面的按钮点击事件（三）

之前的文章介绍过如何使用UIView的tag属性保存额外的信息，并且根据这些信息处理它的点击事件。这个方案有很多缺陷和限制，遂将其改造为使用associatedObject的方式，从根本上解决了这些限制和缺陷。完整代码如下：

//
//  UIView+ExtraTag.h
//  YiShop
//
//  Created by 宗仁 on 16/6/8.
//  Copyright © 2016年 宗仁 All rights reserved.
//
#import <UIKit/UIKit.h>
@interface UIView (ExtraTag)
/**
 * viewType为view的类别，例如商品、店铺等
 */
- (void)setViewTypeForTag:(NSInteger)viewType;
/**
 * position一般为view在列表中的row number
 */
- (void)setPositionForTag:(NSInteger)position;
/**
 * section一般为view在列表中section number
 */
- (void)setSectionForTag:(NSInteger)section;
/**
 * extraInfo一般用view在嵌套列表中的row number
 */
- (void)setExtraInfoForTag:(NSInteger)extraInfo;

- (NSInteger)getViewTypeOfTag;
- (NSInteger)getPositionOfTag;
- (NSInteger)getSectionOfTag;
- (NSInteger)getExtraInfoOfTag;
@end

//
//  UIView+ExtraTag.m
//  YiShop
//
//  Created by 宗仁 on 16/6/8.
//  Copyright © 2016年 宗仁 All rights reserved.
//

#import "UIView+ExtraTag.h"
#import <objc/runtime.h>

static void * KEY_VIEW_TYPE = &KEY_VIEW_TYPE;
static void * KEY_POSITION = &KEY_POSITION;
static void * KEY_SECTION = &KEY_SECTION;
static void * KEY_EXTRA_INFO = &KEY_EXTRA_INFO;

@implementation UIView (ExtraTag)

- (void)setViewTypeForTag:(NSInteger)viewType {
    objc_setAssociatedObject(self, KEY_VIEW_TYPE, [NSNumber numberWithInteger:viewType], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (void)setPositionForTag:(NSInteger)position {
    objc_setAssociatedObject(self, KEY_POSITION, [NSNumber numberWithInteger:position], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (void)setSectionForTag:(NSInteger)section {
    objc_setAssociatedObject(self, KEY_SECTION, [NSNumber numberWithInteger:section], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (void)setExtraInfoForTag:(NSInteger)extraInfo {
    objc_setAssociatedObject(self, KEY_EXTRA_INFO, [NSNumber numberWithInteger:extraInfo], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (NSInteger)getViewTypeOfTag {
    return [objc_getAssociatedObject(self, KEY_VIEW_TYPE) integerValue];
}

- (NSInteger)getPositionOfTag {
    return [objc_getAssociatedObject(self, KEY_POSITION) integerValue];
}

- (NSInteger)getSectionOfTag {
    return [objc_getAssociatedObject(self, KEY_SECTION) integerValue];
}

- (NSInteger)getExtraInfoOfTag {
    return [objc_getAssociatedObject(self, KEY_EXTRA_INFO) integerValue];
}

@end

而Android下的处理方法更简单，使用id设置tag即可，首先创建res/values/ids.xml文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <item name="tag_view_type" type="id"/>
    <item name="tag_position" type="id"/>
    <item name="tag_extra_info" type="id"/>
</resources>

然后改造原来的方法，完整代码如下

/**
 * Get the view's extra info.
 * @param view The view.
 * @return The extra info.
 */
public static int getExtraInfoOfTag(View view) {
    int tag;
    if (view.getTag(R.id.tag_extra_info) == null) {
        tag = 0;
    } else {
        tag = (int) view.getTag(R.id.tag_extra_info);
    }
    return tag;
}

/**
 * Get the view's position of tag.
 * @param view The view.
 * @return The position.
 */
public static int getPositionOfTag(View view) {
    int tag;
    if (view.getTag(R.id.tag_position) == null) {
        tag = 0;
    } else {
        tag = (int) view.getTag(R.id.tag_position);
    }
    return tag;
}

/**
 * Get the type of view.
 * @param view The view.
 * @return The view type.
 */
public static ViewType getViewTypeOfTag(View view) {
    int tag;
    if (view.getTag(R.id.tag_view_type) == null) {
        tag = 0;
    } else {
        tag = (int) view.getTag(R.id.tag_view_type);
    }
    return ViewType.valueOf(tag);
}

/**
 * Add extra info to the view's tag.
 *
 * @param view      The view.
 * @param extraInfo The extra info.
 */
public static void setExtraInfoForTag(View view, int extraInfo) {
    view.setTag(R.id.tag_extra_info, extraInfo);
}

/**
 * Add position info to the view's tag.
 *
 * @param view     The view.
 * @param position The position.
 */
public static void setPositionForTag(View view, int position) {
    view.setTag(R.id.tag_position, position);
}

/**
 * Set the type of view.
 *
 * @param view     The view.
 * @param viewType The view type {@link ViewType}.
 */
public static void setViewTypeForTag(View view, ViewType viewType) {
    view.setTag(R.id.tag_view_type, viewType.ordinal());
}