传送门：AopTestDemo

1. 场景需求

统计UIViewController加载次数
统计UIButton点击次数
统计自定义方法的执行
统计UITableView的Cell点击事件

工程说明，首页Test1ViewController，其中有4个按钮，点击第一个按钮打印，第二个到第四个按钮分别跳转到Test2ViewController，Test3ViewController，Test4ViewController。

技术选型：

手动复制统计的代码逻辑一个个地粘贴到需要统计的类和方法中去。工作量大，可维护性差，仅适用统计埋点极少的情况。
通过继承和重写系统方法 -- 利用写好统计的一个基类，让需要VC继承自该基类，或者调用重写过统计逻辑的按钮基类等等。
简单的分类，添加类方法或者示例方法 -- 将统计逻辑封装在分类方法里面，在需要统计的地方导入并调用分类方法。
替换系统方法的分类：通过运行时Runtime的办法 -- 利用Method Swizzling机制进行方法替换：替换原来的需要在里面统计却不含统计逻辑的方法为新的包含了统计逻辑的方法。
通过AOP的方法 -- 利用Aspect框架对需要进行统计的方法进行挂钩（hook），并注入包含了统计逻辑的代码块（block）。

2. 为VC设计的分类：运行时Method Swizzling方案

场景需求：需要监听全局的某一类的同一方法

这种方案被监听的方法单一，但会影响全局的所有的类的该方法。例如下面的分类，即使你不import，只要存在于工程就会影响。

UIViewController+Trace

#import "UIViewController+Trace.h"
#import "TraceHandler.h"
#import <objc/runtime.h>
#import <objc/objc.h>
#import "Aspects.h"


@implementation UIViewController (Trace)

#pragma mark - 1.自定义实现方法
+ (void)load{
    swizzleMethod([self class], @selector(viewDidAppear:), @selector(swizzled_viewDidAppear:));
}

- (void)swizzled_viewDidAppear:(BOOL)animated{
    // call original implementation
    [self swizzled_viewDidAppear:animated];
    // Begin statistics Event
    [TraceHandler statisticsWithEventName:@"UIViewController"];
}

void swizzleMethod(Class class,SEL originalSelector,SEL swizzledSelector){
    // the method might not exist in the class, but in its superclass
    Method originalMethod = class_getInstanceMethod(class, originalSelector);
    Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);

    // class_addMethod will fail if original method already exists
    BOOL didAddMethod = class_addMethod(class, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod));

    // the method doesn’t exist and we just added one
    if (didAddMethod) {
        class_replaceMethod(class, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));
    }
    else {
        method_exchangeImplementations(originalMethod, swizzledMethod);
    }
}

@end

TraceHandler.m

#import "TraceHandler.h"

@implementation TraceHandler

+ (void)statisticsWithEventName:(NSString *)eventName{
    NSLog(@"-----> %@",eventName);
}

@end

3. 为VC设计的分类：AOP编程方案

场景需求：该方案的适用特点同上第二节。

Aspects 是iOS平台一个轻量级的面向切面编程(AOP)框架，只包括两个方法：一个类方法，一个实例方法。

+ (id<AspectToken>)aspect_hookSelector:(SEL)selector
                      withOptions:(AspectOptions)options
                       usingBlock:(id)block
                            error:(NSError **)error;

- (id<AspectToken>)aspect_hookSelector:(SEL)selector
                      withOptions:(AspectOptions)options
                       usingBlock:(id)block
                            error:(NSError **)error;

函数使用方式简单易懂，挂钩的方式为三种：

typedef NS_OPTIONS(NSUInteger, AspectOptions) {
    AspectPositionAfter   = 0,            /// 在原始方法后调用（默认）
    AspectPositionInstead = 1,            /// 替换原始方法
    AspectPositionBefore  = 2,            /// 在原始方法前调用
    
    AspectOptionAutomaticRemoval = 1 << 3 /// 在执行1次后自动移除
};

调用示例代码：

[UIViewController aspect_hookSelector:@selector(viewWillAppear:) withOptions:AspectPositionAfter usingBlock:^(id<AspectInfo> aspectInfo, BOOL animated) {
    NSLog(@"View Controller %@ will appear animated: %tu", aspectInfo.instance, animated);
} error:NULL];

这段代码是给UIViewController的viewWillAppear:挂钩一个Block，在原始方法执行完成后，打印字符串。

UIViewController+Trace

#pragma mark - 2.使用Aspects框架
+ (void)load{
    [UIViewController aspect_hookSelector:@selector(viewDidAppear:)
                              withOptions:AspectPositionAfter
                               usingBlock:^(id<AspectInfo>aspectInfo){
                                   NSString *className = NSStringFromClass([[aspectInfo instance] class]);;
                                   [TraceHandler statisticsWithEventName:className];
                               } error:nil];
}

4. 为全局AppDelegate设计的分类：AOP编程方案

场景需求：需要监听不同类，不同按钮，系统方法，及表单元点击事件

方案特点：是可代码配置需要监听的清单字典，并且需要注入的统计代码块block也可以写在这个清单里面。

AppDelegate+Trace.m

#import "AppDelegate+Trace.h"
#import "TraceManager.h"

@implementation AppDelegate (Trace)

+ (void)setupLogging{
    NSDictionary *configDic = @{
                                @"ViewController":@{
                                        @"des":@"show ViewController",
                                        },
                                @"Test1ViewController":@{
                                        @"des":@"show Test1ViewController",
                                        @"TrackEvents":@[@{
                                                             @"EventDes":@"click action1",
                                                             @"EventSelectorName":@"action1",
                                                             @"block":^(id<AspectInfo>aspectInfo){
                                                                 NSLog(@"统计 Test1ViewController action1 点击事件");
                                                             },
                                                             },
                                                         @{
                                                             @"EventDes":@"click action2",
                                                             @"EventSelectorName":@"action2",
                                                             @"block":^(id<AspectInfo>aspectInfo){
                                                                 NSLog(@"统计 Test1ViewController action2 点击事件");
                                                             },
                                                             }],
                                        },
                                @"Test2ViewController":@{
                                        @"des":@"show Test2ViewController",
                                        }
                                };
    
    [TraceManager setUpWithConfig:configDic];
}

@end

TraceManager.m

#import "TraceManager.h"

@import UIKit;

typedef void (^AspectHandlerBlock)(id<AspectInfo> aspectInfo);

@implementation TraceManager

+ (void)setUpWithConfig:(NSDictionary *)configDic{
    // hook 所有页面的viewDidAppear事件
    [UIViewController aspect_hookSelector:@selector(viewDidAppear:)
                              withOptions:AspectPositionAfter
                               usingBlock:^(id<AspectInfo> aspectInfo){
                                   dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                                       NSString *className = NSStringFromClass([[aspectInfo instance] class]);
                                       NSString *des = configDic[className][@"des"];
                                       if (des) {
                                           NSLog(@"%@",des);
                                       }
                                   });
                               } error:NULL];
    
    for (NSString *className in configDic) {
        Class clazz = NSClassFromString(className);
        NSDictionary *config = configDic[className];
        
        if (config[@"TrackEvents"]) {
            for (NSDictionary *event in config[@"TrackEvents"]) {
                SEL selekor = NSSelectorFromString(event[@"EventSelectorName"]);
                AspectHandlerBlock block = event[@"block"];
                
                [clazz aspect_hookSelector:selekor
                               withOptions:AspectPositionAfter
                                usingBlock:^(id<AspectInfo> aspectInfo){
                                    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                                        block(aspectInfo);
                                    });
                                }error:NULL];
            }
        }
    }
}

@end

5. 在AppDelegate的类方法中根据Plist监听清单进行HOOK

场景需求：需要监听不同类，不同按钮，系统方法，及表单元点击事件

方案特点：是可代码配置需要监听的清单Plist，但是不能将需要注入的统计代码块block写在这个清单Plist里面。

EventList.plist

AspectMananer.m

#pragma mark --- 监控button的点击事件
+ (void)trackBttonEvent{
    
    __weak typeof(self) ws = self;
    
    //设置事件统计
    //放到异步线程去执行
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        //读取配置文件，获取需要统计的事件列表
        NSString *path = [[NSBundle mainBundle] pathForResource:@"EventList" ofType:@"plist"];
        NSDictionary *eventStatisticsDict = [[NSDictionary alloc] initWithContentsOfFile:path];
        for (NSString *classNameString in eventStatisticsDict.allKeys) {
            //使用运行时创建类对象
            const char * className = [classNameString UTF8String];
            //从一个字串返回一个类
            Class newClass = objc_getClass(className);
            
            NSArray *pageEventList = [eventStatisticsDict objectForKey:classNameString];
            for (NSDictionary *eventDict in pageEventList) {
                //事件方法名称
                NSString *eventMethodName = eventDict[@"MethodName"];
                SEL seletor = NSSelectorFromString(eventMethodName);
                NSString *eventId = eventDict[@"EventId"];
                
                [ws trackEventWithClass:newClass selector:seletor eventID:eventId];
                [ws trackTableViewEventWithClass:newClass selector:seletor eventID:eventId];
                [ws trackParameterEventWithClass:newClass selector:seletor eventID:eventId];
            }
        }
    });
}



#pragma mark -- 1.监控button和tap点击事件(不带参数)
+ (void)trackEventWithClass:(Class)klass selector:(SEL)selector eventID:(NSString*)eventID{
    
    [klass aspect_hookSelector:selector withOptions:AspectPositionAfter usingBlock:^(id<AspectInfo> aspectInfo) {
        
        NSString *className = NSStringFromClass([aspectInfo.instance class]);
        NSLog(@"className--->%@",className);
        NSLog(@"event----->%@",eventID);
        if ([eventID isEqualToString:@"xxx"]) {
//            [EJServiceUserInfo isLogin]?[MobClick event:eventID]:[MobClick event:@"???"];
        }else{
//            [MobClick event:eventID];
        }
    } error:NULL];
}


#pragma mark -- 2.监控button和tap点击事件（带参数）
+ (void)trackParameterEventWithClass:(Class)klass selector:(SEL)selector eventID:(NSString*)eventID{
    
    [klass aspect_hookSelector:selector withOptions:AspectPositionAfter usingBlock:^(id<AspectInfo> aspectInfo,UIButton *button) {
        
        NSLog(@"button---->%@",button);
        NSString *className = NSStringFromClass([aspectInfo.instance class]);
        NSLog(@"className--->%@",className);
        NSLog(@"event----->%@",eventID);
        
    } error:NULL];
}


#pragma mark -- 3.监控tableView的点击事件
+ (void)trackTableViewEventWithClass:(Class)klass selector:(SEL)selector eventID:(NSString*)eventID{
    
    [klass aspect_hookSelector:selector withOptions:AspectPositionAfter usingBlock:^(id<AspectInfo> aspectInfo,NSSet *touches, UIEvent *event) {
        
        NSString *className = NSStringFromClass([aspectInfo.instance class]);
        NSLog(@"className--->%@",className);
        NSLog(@"event----->%@",eventID);
        NSLog(@"section---->%@",[event valueForKeyPath:@"section"]);
        NSLog(@"row---->%@",[event valueForKeyPath:@"row"]);
        NSInteger section = [[event valueForKeyPath:@"section"]integerValue];
        NSInteger row = [[event valueForKeyPath:@"row"]integerValue];
        
        //统计事件
        if (section == 0 && row == 1) {
//            [MobClick event:eventID];
        }
        
    } error:NULL];
}

Appdelegate.m调用

[AspectMananer trackBttonEvent];