objective - c 的黑魔法 method swizzle

直接看代码

咱们村的人都知道NSObject是爹，那就让给爹加俩方法，这样所有的儿子都能进行swizzle

#import <Foundation/Foundation.h>

@interface NSObject (WPSwizzle)
//替换对象方法
+ (void)swizzleInstanceSelector:(SEL)origSelector withNewSelector:(SEL)newSelector;
//替换类方法
+ (void)swizzleClassSelector:(SEL)origSelector withNewSelector:(SEL)newSelector;
@end
#import "NSObject+WPSwizzle.h"
#import <objc/runtime.h>
@implementation NSObject (WPSwizzle)
//替换对象方法
+ (void)swizzleInstanceSelector:(SEL)origSelector withNewSelector:(SEL)newSelector{
    Method method1 = class_getInstanceMethod([self class], origSelector);
    Method method2 = class_getInstanceMethod([self class], newSelector);
    method_exchangeImplementations(method1, method2);
}
//替换类方法
+ (void)swizzleClassSelector:(SEL)origSelector withNewSelector:(SEL)newSelector{
    Method method1 = class_getClassMethod([self class], origSelector);
    Method method2 = class_getClassMethod([self class], newSelector);
    method_exchangeImplementations(method1, method2);
}
@end

接下来儿子们干活，添加页面统计路径，已类名为页面路径名

//
//  UIViewController+UMengViewPage.h
//  Identify
//
//  Created by wupeng on 16/3/7.
//  Copyright © 2016年 StarShine. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIViewController (UMengViewPage)

@end

#import "UIViewController+UMengViewPage.h"
#import <UMengAnalytics-NO-IDFA/MobClick.h>
#import "NSObject+WPSwizzle.h"

@implementation UIViewController (UMengViewPage)
// 分类并不推荐
//-(void)viewWillAppear:(BOOL)animated {
//    if ([self isKindOfClass:[UINavigationController class]] || [self isKindOfClass:[UITabBarController class]]) {
//        
//    } else {
//        [MobClick beginLogPageView:NSStringFromClass([self class])];
//    }
//}
//-(void)viewDidDisappear:(BOOL)animated {
//    if ([self isKindOfClass:[UINavigationController class]] || [self isKindOfClass:[UITabBarController class]]) {
//        
//    } else {
//        [MobClick endLogPageView:NSStringFromClass([self class])];
//    }
//}
+(void)load {
    [self swizzleInstanceSelector:@selector(viewWillAppear:) withNewSelector:@selector(wp_viewWillAppear:)];
    [self swizzleInstanceSelector:@selector(viewDidDisappear:) withNewSelector:@selector(wp_viewDidDisappear:)];
}
-(void)wp_viewWillAppear:(BOOL)animated {
    [self wp_viewWillAppear:true];
    if ([self isKindOfClass:[UINavigationController class]] || [self isKindOfClass:[UITabBarController class]] || [self isKindOfClass:[UIInputViewController class]] ||
        [self isKindOfClass:[UIAlertController class]]) {
        
    } else {
        NSString *vcName =  NSStringFromClass([self class]);
        if (![vcName isEqualToString:@"UIInputWindowController"]) {
            [MobClick beginLogPageView:vcName];
        }
    }
}
-(void)wp_viewDidDisappear:(BOOL)animated {
    [self wp_viewDidDisappear:true];
    if ([self isKindOfClass:[UINavigationController class]] || [self isKindOfClass:[UITabBarController class]] || [self isKindOfClass:[UIInputViewController class]] ||
        [self isKindOfClass:[UIAlertController class]]) {
        
    } else {
        NSString *vcName =  NSStringFromClass([self class]);
        if (![vcName isEqualToString:@"UIInputWindowController"]) {
            [MobClick endLogPageView:vcName];
        }
    }
}
@end