iOS 友盟统计页面访问路径（Category）

前言：项目需求添加友盟页面访问路径及访问深度

• 友盟官方文档中介绍，在每个UIViewController的两个生命周期方法中执行两个统计的两个方法（注意：必须配对调用beginLogPageView:和endLogPageView:两个函数来完成自动统计，若只调用某一个函数不会生成有效数据；在该页面展示时调用beginLogPageView:，当退出该页面时调用endLogPageView。）

• 在ViewController类的viewWillAppear: 和 viewWillDisappear:中配对调用如下方法：

-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [MobClick beginLogPageView:@"Pagename"]; //("Pagename"为页面名称，可自定义)
}


-(void)viewWillDisappear:(BOOL)animated 
{
    [super viewWillDisappear:animated];
    [MobClick endLogPageView:@"Pagename"];
}

其实集成已经特别很简单，但是现在的问题在每个Controller里面的去调用写这个方法显然是不科学的，尤其现在已经成熟的项目那要加多少😁，那么就用Category一劳永逸的解决完成这个需求！

1.创建ViewController分类

• UIViewController+WTVYXJAS.h

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface UIViewController (WTVYXJAS)

/** 友盟统计Log*/
@property (nonatomic ,copy) NSString * umLogAs;

@end

NS_ASSUME_NONNULL_END

• UIViewController+WTVYXJAS.m

#import "UIViewController+WTVYXJAS.h"

@implementation UIViewController (WTVYXJAS)

//参考资料：http://blog.leichunfeng.com/blog/2015/06/14/objective-c-method-swizzling-best-practice/
+ (void)load{ 
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Class class = [self class];
        SEL viewWillOriginaSelector = @selector(viewWillAppear:);
        SEL viewWillSwizzledSelector = @selector(as_viewWillAppear:);

        SEL viewWillDissOriginaSelector = @selector(viewWillDisappear:);
        SEL viewWillDissSwizzledSelector = @selector(as_viewWillDisappear:);

        Method viewWillAppear = class_getInstanceMethod(class, @selector(viewWillAppear:));
        Method as_viewWillAppear = class_getInstanceMethod(class, @selector(as_viewWillAppear:));
        BOOL viewWillSuccess = class_addMethod(class, viewWillOriginaSelector, method_getImplementation(as_viewWillAppear), method_getTypeEncoding(as_viewWillAppear));
        if (viewWillSuccess) {
            class_replaceMethod(class, viewWillSwizzledSelector, method_getImplementation(viewWillAppear), method_getTypeEncoding(viewWillAppear));
        }else{
            method_exchangeImplementations(viewWillAppear, as_viewWillAppear);
        }

        Method viewWillDisappear = class_getInstanceMethod(class, @selector(viewWillDisappear:));
        Method as_viewWillDisappear = class_getInstanceMethod(class, @selector(as_viewWillDisappear:));

        BOOL viewWillDissSuccess = class_addMethod(class, viewWillDissOriginaSelector, method_getImplementation(as_viewWillDisappear), method_getTypeEncoding(as_viewWillDisappear));
        if (viewWillDissSuccess) {
            class_replaceMethod(class, viewWillDissSwizzledSelector, method_getImplementation(viewWillDisappear), method_getTypeEncoding(viewWillDisappear));
        }else{
            method_exchangeImplementations(viewWillDisappear, as_viewWillDisappear);
        }
    });
}


- (void)as_viewWillAppear:(BOOL)animated{
    if (self.title.length) {
        NSLog(@"开始路径%@->%@ -> %s",NSStringFromClass(self.class),self.title,__func__);
        [MobClick beginLogPageView:self.title];
    }
    [self as_viewWillAppear:animated];
}

- (void)as_viewWillDisappear:(BOOL)animated{
    if (self.title.length) {
        NSLog(@"结束路径%@->%@ -> %s",NSStringFromClass(self.class),self.title,__func__);
        [MobClick endLogPageView:self.title];
    }
    [self as_viewWillDisappear:animated];
}

- (void)setUmLogAs:(NSString *)umLogAs{
    objc_setAssociatedObject(self, @selector(umLogAs), umLogAs, OBJC_ASSOCIATION_COPY_NONATOMIC);
}


- (NSString *)umLogAs{
    //_cmd在Objective-C的方法中表示当前方法的selector，正如同self表示当前方法调用的对象实例一样。
    return objc_getAssociatedObject(self, _cmd);
}

@end

2.关于自定义Controller或者自定义导航栏需实现

//友盟统计需要
- (void)loadView{
    [super loadView];
    self.title = @"自定义导航栏";
}

3.如果在VC里面实现这两个方法必须实现[super xxxxx]）不然被统计不上去

-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];    //必须实现
}


-(void)viewWillDisappear:(BOOL)animated 
{
    [super viewWillDisappear:animated]; //必须实现
}