iOS通过Runtime实现友盟统计

在友盟官网可以看到相应的步骤，申请appkey，导入SDK，然后在AppDelegate里面写入相应的代码，下面就是关键的代码：

实现页面的统计需要在每个UIViewController中配对调用如下方法：

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

几年之前做过这个，那时候才刚开始做iOS，就按照这个文档在每一个UIViewController里面写了这个方法，现在看来真是太low了。
这次又做这个友盟统计，就想起来用runtime解决这个问题。

在工程中创建一个UIViewController的Category，然后通过Runtime动态添加两个方法，分别替代viewWillAppear和viewWillDisappear方法。这样就不需要在每一个 UIViewController写这段代码了。

新建一个分类：

UIViewController+Statistics.h

//
//  UIViewController+Statistics.h
//  TongYuanHospital
//
//  Created by ZSP on 2017/6/16.
//  Copyright © 2017年 ZSP. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIViewController (Statistics)

@end

UIViewController+Statistics.m

//
//  UIViewController+Statistics.m
//  TongYuanHospital
//
//  Created by ZSP on 2017/6/16.
//  Copyright © 2017年 ZSP. All rights reserved.
//

#import "UIViewController+Statistics.h"

@implementation UIViewController (Statistics)


+ (void)load {
    
    //原本的viewWillApper方法
    Method viewWillAppear = class_getInstanceMethod(self, @selector(viewWillAppear:));
    
    //需要替换成能够输入日志的viewWillAppear
    Method logViewWillAppear = class_getInstanceMethod(self, @selector(logViewWillAppear:));
    
    
    //原本的viewWillDisappear方法
    Method viewWillDisappear = class_getInstanceMethod(self, @selector(viewWillDisappear:));
    //需要替换成能够输入日志的viewWillDisappear
    Method logviewWillDisappear = class_getInstanceMethod(self, @selector(logviewWillDisappear:));
    
    //两方法进行交换
    method_exchangeImplementations(viewWillAppear, logViewWillAppear);
    method_exchangeImplementations(viewWillDisappear, logviewWillDisappear);
    
}
-(void)logViewWillAppear:(BOOL)animated
{
    [self logViewWillAppear:animated];    
    NSString *selfClass = NSStringFromClass([self class]);
    [MobClick beginLogPageView:selfClass];
    //当然这里也可以使用self.title作为页面的名称，这样在友盟后台查看的时候更加方便些
    //[MobClick endLogPageView:self.title];   
}

-(void)logviewWillDisappear:(BOOL)animated
{
    [self logviewWillDisappear:animated];
    NSString *selfClass = NSStringFromClass([self class]);
    [MobClick endLogPageView:selfClass];
}


@end