『ios』无痕埋点探索 (页面显示 UIButton UIGestureRecognizer)

这是一篇无痕埋点方案的探索，学到的东西，怕忘记了，所以记下来，就这样。
我们在平时的项目中，会用到埋点这个功能吧，如果页面很少，还好说，我们可以手动进行埋点，如果是页面变多，那么手动埋点将会变得非常的浪费时间和效率，所以无痕埋点就这样诞生了。

讲无痕埋点之前先放一个方法。

交换方法

+(void)swizzingForClass:(Class)cls originalSel:(SEL)originalSelector swizzingSel:(SEL)swizzingSelector
{
    Class class = cls;
    Method originalMethod = class_getInstanceMethod(class, originalSelector);
    Method  swizzingMethod = class_getInstanceMethod(class, swizzingSelector);
    
    BOOL addMethod = class_addMethod(class,
                                     originalSelector,
                                     method_getImplementation(swizzingMethod),
                                     method_getTypeEncoding(swizzingMethod));
    
    if (addMethod) {
        class_replaceMethod(class,
                            swizzingSelector,
                            method_getImplementation(originalMethod),
                            method_getTypeEncoding(originalMethod));
    }else{
        
        method_exchangeImplementations(originalMethod, swizzingMethod);
    }
}

因为埋点的精髓部分在于对数据的处理，所以别急，继续往下看。

对于页面显示隐藏方面的埋点该怎么做呢？没错就是对viewWillAppear viewWillDisappear viewDidLoad进行交换，然后监听。

+(void)load
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        SEL originalAppearSelector = @selector(viewWillAppear:);
        SEL swizzingAppearSelector = @selector(user_viewWillAppear:);
        [MethodSwizzingTool swizzingForClass:[self class] originalSel:originalAppearSelector swizzingSel:swizzingAppearSelector];
        
        SEL originalDisappearSelector = @selector(viewWillDisappear:);
        SEL swizzingDisappearSelector = @selector(user_viewWillDisappear:);
        [MethodSwizzingTool swizzingForClass:[self class] originalSel:originalDisappearSelector swizzingSel:swizzingDisappearSelector];
        
        SEL originalDidLoadSelector = @selector(viewDidLoad);
        SEL swizzingDidLoadSelector = @selector(user_viewDidLoad);
        [MethodSwizzingTool swizzingForClass:[self class] originalSel:originalDidLoadSelector swizzingSel:swizzingDidLoadSelector];
        
    });
}

那对于按钮的点击监听呢？别忘了这个方法sendAction:to:forEvent:。

 SEL originalSelector = @selector(sendAction:to:forEvent:);
        SEL swizzingSelector = @selector(user_sendAction:to:forEvent:);
        [MethodSwizzingTool swizzingForClass:[self class] originalSel:originalSelector swizzingSel:swizzingSelector];

那如何定位到到点击了哪个btn呢？先看数据结构吧

"ACTION": {
        "ViewController/jumpSecond/0": {
            "userDefined": {
                "eventid": "201803074|93",
                "target": "",
                "pageid": "234",
                "pagename": "button点击，跳转至下一个页面"
            },
            "pagePara": {
                "testKey9": {
                    "propertyName": "testPara",
                    "propertyPath":"",
                    "containIn": "0"
                }
            }
        },
        
        "SecondViewController/back": {
            "userDefined": {
                "eventid": "201803074|965",
                "target": "second",
                "pageid": "234",
                "pagename": "button点击，返回"
            },
            "pagePara": {
                "testKey9": {
                    "propertyName": "testPara",
                    "propertyPath":"",
                    "containIn": "0"
                }
            }
        }
    },

再来看监听的事件

-(void)user_sendAction:(SEL)action to:(id)target forEvent:(UIEvent *)event
{
    [self user_sendAction:action to:target forEvent:event];
    
    NSString * identifier = [NSString stringWithFormat:@"%@/%@/%ld", [target class], NSStringFromSelector(action),self.tag];
    NSDictionary * dic = [[[DataContainer dataInstance].data objectForKey:@"ACTION"] objectForKey:identifier];
    if (dic) {
        
        NSString * eventid = dic[@"userDefined"][@"eventid"];
        NSString * targetname = dic[@"userDefined"][@"target"];
        NSString * pageid = dic[@"userDefined"][@"pageid"];
        NSString * pagename = dic[@"userDefined"][@"pagename"];
        NSDictionary * pagePara = dic[@"pagePara"];
        __block NSMutableDictionary * uploadDic = [NSMutableDictionary dictionaryWithCapacity:0];
        [pagePara enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
            
            id value = [CaptureTool captureVarforInstance:target withPara:obj];
            if (value && key) {
                [uploadDic setObject:value forKey:key];
            }
        }];
        NSLog(@"\n event id === %@,\n  target === %@, \n  pageid === %@,\n  pagename === %@,\n pagepara === %@ \n", eventid, targetname, pageid, pagename, uploadDic);

    }
}

可以看到identifier @"ViewController/jumpSecond/0"
我们根据当前所在的类跳转的方法按钮的tag 来找到那个btn，进行进行打点。

image.png

对于手势的监听呢？这个跟btn这些就不太一样了。这个需要监听设置代理的方法。initWithTarget:action:

+ (void)load
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        
        [MethodSwizzingTool swizzingForClass:[self class] originalSel:@selector(initWithTarget:action:) swizzingSel:@selector(vi_initWithTarget:action:)];
    });
}

然后添加关于sel_ SEL "UIDimmingView/handleSingleTap:" 的方法实现responseUser_gesture，具体UIDimmingView是什么可以自行打印查看。然后与handleSingleTap进行方法交换。

- (instancetype)vi_initWithTarget:(nullable id)target action:(nullable SEL)action
{
    UIGestureRecognizer *selfGestureRecognizer = [self vi_initWithTarget:target action:action];
    
    if (!target && !action) {
        return selfGestureRecognizer;
    }
    
    if ([target isKindOfClass:[UIScrollView class]]) {
        return selfGestureRecognizer;
    }
    
    Class class = [target class];
    
    
    SEL sel = action;
    
    NSString * sel_name = [NSString stringWithFormat:@"%s/%@", class_getName([target class]),NSStringFromSelector(action)];
    SEL sel_ =  NSSelectorFromString(sel_name);
    
    BOOL isAddMethod = class_addMethod(class,
                                       sel_,
                                       method_getImplementation(class_getInstanceMethod([self class], @selector(responseUser_gesture:))),
                                       nil);
    //看到这里别疑惑，这里是我们给UIGestureRecognizer添加的属性。
    self.methodName = NSStringFromSelector(action);
    if (isAddMethod) {
        Method selMethod = class_getInstanceMethod(class, sel);
        Method sel_Method = class_getInstanceMethod(class, sel_);
        method_exchangeImplementations(selMethod, sel_Method);
    }
    
    return selfGestureRecognizer;
}

然后我们可以实现responseUser_gesture


-(void)responseUser_gesture:(UIGestureRecognizer *)gesture
{
    
    NSString * identifier = [NSString stringWithFormat:@"%s/%@", class_getName([self class]),gesture.methodName];
    
    SEL sel = NSSelectorFromString(identifier);
    if ([self respondsToSelector:sel]) {
        IMP imp = [self methodForSelector:sel];
        void (*func)(id, SEL,id) = (void *)imp;
        func(self, sel,gesture);
    }
    
    
    NSDictionary * dic = [[[DataContainer dataInstance].data objectForKey:@"GESTURE"] objectForKey:identifier];
    if (dic) {
        
        NSString * eventid = dic[@"userDefined"][@"eventid"];
        NSString * targetname = dic[@"userDefined"][@"target"];
        NSString * pageid = dic[@"userDefined"][@"pageid"];
        NSString * pagename = dic[@"userDefined"][@"pagename"];
        NSDictionary * pagePara = dic[@"pagePara"];
        
        __block NSMutableDictionary * uploadDic = [NSMutableDictionary dictionaryWithCapacity:0];
        [pagePara enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
            id value = [CaptureTool captureVarforInstance:self withPara:obj];
            if (value && key) {
                [uploadDic setObject:value forKey:key];
            }
        }];
        
        NSLog(@"\n event id === %@,\n  target === %@, \n  pageid === %@,\n  pagename === %@,\n pagepara === %@ \n", eventid, targetname, pageid, pagename, uploadDic);
        
    }
}

我们可以根据手势所在的类名和方法来确定这是哪一个手势。当然如果你可以保证手势名字的唯一性。直接用名字也可以。