Hook 无侵入式埋点（页面统计）

一、技术原理

Method-Swizzling 黑魔法 方法交换（不懂的可以查）

二、页面统计

某盟页面统计SDK需要开发者在APP基类里实现ViewDidAppear和viewDidDisappear方法，或者在某个特定的类实现以上俩方法。下面采用无侵入式埋点实现页面统计，无需APP开发者实现以上俩方法，适用于开发SDK的公司，无感知采集APP信息。

三、代码实现

#import <UIKit/UIKit.h>

 

@interface UIViewController (FRHook)

 

@end

#import "UIViewController+FRHook.h"

#import <objc/runtime.h>

@implementation UIViewController (FRHook)

+(void)load{

    

    Method appearMethod = class_getInstanceMethod([self class], @selector(viewDidAppear:));

    Method hookAppearMethod = class_getInstanceMethod([self class], @selector(hook_ViewDidAppear:));

    method_exchangeImplementations(appearMethod, hookAppearMethod);

    

    Method disappearMethod = class_getInstanceMethod([self class], @selector(viewDidDisappear:));

    Method hookDisappearMethod = class_getInstanceMethod([self class], @selector(hook_viewDidDisappear:));

    method_exchangeImplementations(disappearMethod, hookDisappearMethod);

}

- (void)hook_ViewDidAppear:(BOOL)animated

{

    [self hook_ViewDidAppear:animated];

    if (![self isKindOfClass:[UINavigationController class]]&&![self isKindOfClass:[UITabBarController class]]) {

        NSString *appearDetailInfo = [NSString stringWithFormat:@" %@ - %@ - %@", NSStringFromClass([self class]),self.navigationItem.title, @"didAppear"];

//        NSLog(@"%@", appearDetailInfo);

        //上传到服务器

    }

}

 

- (void)hook_viewDidDisappear:(BOOL)animated

{

    [self hook_viewDidDisappear:animated];

    if (![self isKindOfClass:[UINavigationController class]]&&![self isKindOfClass:[UITabBarController class]]) {

        NSString *disappearDetailInfo = [NSString stringWithFormat:@" %@ - %@ - %@", NSStringFromClass([self class]),self.navigationItem.title, @"didDisappear"];

//        NSLog(@"%@", disappearDetailInfo);

        //上传到服务器

    }

}

四、举一反三

怎么采集用户的的触摸信息？