給UIViewController添加一個(gè)分類,實(shí)現(xiàn)這個(gè)分類

例如,命名為UIViewController+UMengAnalytics

#import "UIViewController+UMengAnalytics.h"
#import <UMMobClick/MobClick.h>

@implementation UIViewController (UMengAnalytics)

+ (void)load {
    // 系統(tǒng)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 qy_viewWillAppear = class_getInstanceMethod(self, @selector(qy_viewWillAppear:));
    
    // 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 qy_viewWillDisappear = class_getInstanceMethod(self, @selector(qy_viewWillDisappear:));
    
    // 兩方法進(jìn)行交換
    method_exchangeImplementations(viewWillAppear, qy_viewWillAppear);
    method_exchangeImplementations(viewWillDisappear, qy_viewWillDisappear);
}

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

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

@end