在友盟官網可以看到相應的步驟，申請appkey，導入SDK，然後在AppDelegate裡面寫入相應的代碼，下面就是關鍵的代碼：

實現頁面的統計需要在每個UIViewController中配對調用如下方法：

  - (void)viewWillAppear:(BOOL)animated
  {
    [super viewWillAppear:animated];
    [MobClick beginLogPageView:@"PageOne"];//("PageOne"為頁面名稱，可自定義)
  }
- (void)viewWillDisappear:(BOOL)animated 
  {
    [super viewWillDisappear:animated];
    [MobClick endLogPageView:@"PageOne"];
  }

幾年之前做過這個，那時候才剛開始做iOS，就按照這個文檔在每一個UIViewController裡面寫了這個方法，現在看來真是太low了。

這次又做這個友盟統計，就想起來用runtime解決這個問題。

在工程中創建一個UIViewController的Category，然後通過Runtime動態添加兩個方法，分別替代viewWillAppear和viewWillDisappear方法。這樣就不需要在每一個 UIViewController寫這段代碼了。

新建一個分類：

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:));

  //需要替換成能夠輸入日志的viewWillAppear
  Method logViewWillAppear = class_getInstanceMethod(self, @selector(logViewWillAppear:));


  //原本的viewWillDisappear方法
  Method viewWillDisappear = class_getInstanceMethod(self, @selector(viewWillDisappear:));
  //需要替換成能夠輸入日志的viewWillDisappear
  Method logviewWillDisappear = class_getInstanceMethod(self, @selector(logviewWillDisappear:));

  //兩方法進行交換
  method_exchangeImplementations(viewWillAppear, logViewWillAppear);
  method_exchangeImplementations(viewWillDisappear, logviewWillDisappear);

}
-(void)logViewWillAppear:(BOOL)animated
{
  [self logViewWillAppear:animated];  
  NSString *selfClass = NSStringFromClass([self class]);
  [MobClick beginLogPageView:selfClass];
  //當然這裡也可以使用self.title作為頁面的名稱，這樣在友盟後台查看的時候更加方便些
  //[MobClick endLogPageView:self.title];  
}

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


@end

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