ObjC的RunTime以及项目实践

文章出处，原创于 https://HawkingOuYang.github.io/

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ObjC runtime → OneV
Objective-C具有相当多的动态特性，基本的，也是经常被提到和用到的有动态类型（Dynamic typing），动态绑定（Dynamic binding）和动态加载（Dynamic loading）。

runtime 埋点

#import <objc/runtime.h>
#import <objc/message.h>


typedef void (*_VIMP)(id,SEL,...);
typedef  id  (*_IMP)(id ,SEL,...);

#import "UIViewController+OYxjViewDidAppear.h"




#pragma mark - const

//! 关联属性 KEY pageUUID
static const char *kPropertyKey_pageUUID    ="kPropertyKey_pageUUID";



#pragma mark - Class

@interface UIViewController ()
@property(nonatomic,copy) NSString *pageUUID;
@end


@implementation UIViewController (OYxjViewDidAppear)


+(void)load{
    
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
    {//页面显示--begin//
        Method mViewDidAppear  = class_getInstanceMethod(self, @selector(viewDidAppear:));
        //获得方法实现
        _VIMP  mViewDidAppear_IMP  = (_VIMP)method_getImplementation(mViewDidAppear);
        
        //重新 实现方法
        method_setImplementation(mViewDidAppear, imp_implementationWithBlock(^ (id target, SEL action){
            NSTimeInterval timestamp = [[NSDate date] timeIntervalSince1970];
            
            // 使用类名 作为 页面名字
            NSString *vcName = NSStringFromClass([target class]);
            
            // 过滤掉UIKit 的内部控制器，没有必要统计
            BOOL isSelfInputVC =  [vcName hasSuffix:@"InputViewController"] && ![vcName hasPrefix:@"HTm"];
            BOOL isUIKitVC = isSelfInputVC ||
                            [vcName hasSuffix:@"InputWindowController"] ||
                            [vcName hasPrefix:@"PUUI"] ||
                            [vcName hasPrefix:@"CKSMSComposeController"] ||
                            [vcName hasPrefix:@"PUUIAlbumListViewController"];
            
            
            if (
                [target isKindOfClass:[UITabBarController class]]
                ||
                [target isKindOfClass:[UINavigationController class]]
                ||
                isUIKitVC
               )
            {
                //do nothing here !
                //tabbar控制器、导航栏控制器，不上报日志。
            }
            else if (
                     [target navigationController] == nil
                     ||
                     [[[target navigationController] viewControllers] containsObject:target]
                    )//自己写的页面，才上报日志。
            {
            
                NSString *page_uuid = [NSString stringWithFormat:@"%@_%f",vcName,timestamp];
                
                //关联对象
                [target setPageUUID:page_uuid];
                
                NSString *page_id =vcName;
                [e1 addPropwithStr:@"pageId"     propVal:page_id.length?page_id:@""];
                [e1 addPropwithStr:@"page_uuid"  propVal:page_uuid.length?page_uuid:@""];
            

                DDLogVerbose(@"上报日志，页面显示：%@ %@,  %@ %@", @"page_id",page_id,  @"page_uuid",page_uuid );
            }
            
            
            // 调用原来的方法实现
            mViewDidAppear_IMP(target,@selector(viewDidAppear:));
        }));
    }//页面显示--end//
        
        
    {//页面消失--begin//
        Method mViewWilDisappear = class_getInstanceMethod(self, @selector(viewWillDisappear:));
        //获得方法实现
        _VIMP  mViewWillDisappear_IMP  = (_VIMP)method_getImplementation(mViewWilDisappear);
        
        //重新 实现方法
        method_setImplementation(mViewWilDisappear, imp_implementationWithBlock(^ (id target, SEL action){
            
            // 使用类名 作为 页面名字
            NSString *vcName = NSStringFromClass([target class]);
            
            // 过滤掉UIKit 的内部控制器，没有必要统计
            BOOL isSelfInputVC =  [vcName hasSuffix:@"InputViewController"] && ![vcName hasPrefix:@"HTm"];
            BOOL isUIKitVC =  isSelfInputVC ||
                            [vcName hasSuffix:@"InputWindowController"] ||
                            [vcName hasPrefix:@"PUUI"] ||
                            [vcName hasPrefix:@"CKSMSComposeController"] ||
                            [vcName hasPrefix:@"PUUIAlbumListViewController"];
            
            
            if (
                [target isKindOfClass:[UITabBarController class]]
                ||
                [target isKindOfClass:[UINavigationController class]]
                ||
                isUIKitVC
               )
            {
                //do nothing here !
                //tabbar控制器、导航栏控制器，不上报日志。
            }
            else if (
                     [target navigationController] == nil
                     ||
                     [[[target navigationController] viewControllers] containsObject:target]
                    )//自己写的页面，才上报日志。
            {
                
                // 关联page_uuid
                NSString *page_uuid = [target pageUUID];
                
                NSString *page_id = vcName;
                [e1 addPropwithStr:@"pageId"     propVal:page_id.length?page_id:@""];
                [e1 addPropwithStr:@"page_uuid"  propVal:page_uuid.length?page_uuid:@""];
                

                DDLogVerbose(@"上报日志，页面消失：%@ %@,  %@ %@", @"page_id",page_id,  @"page_uuid",page_uuid );
            }
            
            
            // 调用原来的方法实现
            mViewWillDisappear_IMP(target,@selector(viewWillDisappear:));
        }));
    
    }//页面消失--end//
    
    });//<--- dispatch_once END --->//
    
};



#pragma mark - 关联属性

//! 关联 pageUUID 这个property。
- (NSString *)pageUUID
{
    return objc_getAssociatedObject(self,
                                    kPropertyKey_pageUUID);
}
//! 关联 pageUUID 这个property。
- (void)setPageUUID:(NSString *)pageUUID
{
    objc_setAssociatedObject(self,
                             kPropertyKey_pageUUID,
                             pageUUID,
                             OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

@end

runtime 加载 .dylib