2019-04-10 runtime之埋点

需求：项目完成后，boss要统计所有界面的停留时间。
使用runtime能方便处理
思路：所有控制器继承自UIViewController，给UIViewController写个分类，重写load方法，用runtime的method_exchangeImplementations交换系统生命周期方法。

@implementation UIViewController (zxh)
+(void)load{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Method m1 = class_getInstanceMethod(self, NSSelectorFromString(@"zxh_viewDidAppear:"));
        Method m2 = class_getInstanceMethod(self, NSSelectorFromString(@"viewDidAppear:"));
        method_exchangeImplementations(m1, m2);

        m1 = class_getInstanceMethod(self, NSSelectorFromString(@"zxh_viewDidLoad"));
        m2 = class_getInstanceMethod(self, NSSelectorFromString(@"viewDidLoad"));
        method_exchangeImplementations(m1, m2);

        m1 = class_getInstanceMethod(self, NSSelectorFromString(@"zxh_viewWillAppear:"));
        m2 = class_getInstanceMethod(self, NSSelectorFromString(@"viewWillAppear:"));
        method_exchangeImplementations(m1, m2);

        m1 = class_getInstanceMethod(self, NSSelectorFromString(@"zxh_viewWillDisappear:"));
        m2 = class_getInstanceMethod(self, NSSelectorFromString(@"viewWillDisappear:"));
        method_exchangeImplementations(m1, m2);


        m1 = class_getInstanceMethod(self, NSSelectorFromString(@"zxh_viewDidDisappear:"));
        m2 = class_getInstanceMethod(self, NSSelectorFromString(@"viewDidDisappear:"));
        method_exchangeImplementations(m1, m2);

        m1 = class_getInstanceMethod(self, NSSelectorFromString(@"zxh_dealloc"));
        m2 = class_getInstanceMethod(self, NSSelectorFromString(@"dealloc"));
        method_exchangeImplementations(m1, m2);

        m1 = class_getInstanceMethod(self, NSSelectorFromString(@"zxh_didReceiveMemoryWarning"));
        m2 = class_getInstanceMethod(self, NSSelectorFromString(@"didReceiveMemoryWarning"));
        method_exchangeImplementations(m1, m2);

    });

}

static int loadTime = 0;

-(void)zxh_viewDidAppear:(BOOL)animated{
    NSLog(@"%@<======zxh_viewDidAppear",[self class]);
    loadTime = [NSDate timeIntervalSinceReferenceDate];
    [self zxh_viewDidAppear:animated];
}

-(void)zxh_viewDidLoad{
    NSLog(@"%@+++++++++zxh_viewDidLoad",[self class]);
    [self zxh_viewDidLoad];
}

-(void)zxh_viewWillAppear:(BOOL)animated{
    NSLog(@"%@======>zxh_viewWillAppear",[self class]);
    [self zxh_viewWillAppear:animated];
}


-(void)zxh_viewWillDisappear:(BOOL)animated{
    NSLog(@"%@<======zxh_viewWillDisappear",[self class]);
    NSLog(@"%@ 时间： %f",[self class], [NSDate timeIntervalSinceReferenceDate] - loadTime);
    [self zxh_viewWillDisappear:animated];
}

-(void)zxh_viewDidDisappear:(BOOL)animated{
    NSLog(@"%@-------zxh_viewDidDisappear",[self class]);
    [self zxh_viewDidDisappear:animated];
}

-(void)zxh_dealloc{
    NSLog(@"%@**********zxh_dealloc", [self class]);
    [self zxh_dealloc];
}


-(void)zxh_didReceiveMemoryWarning{
    NSLog(@"%@**********内存警告！！！！", [self class]);
    [self zxh_didReceiveMemoryWarning];
}