iOS|iOS NSProxy使用 iOSNSProxy使用

简介:通过NSProxy 可以实现类的"伪多继承",demo中KLProxy通过拦截方法修改了cat和dog本来的log
Log.png 1.VC实现

import "ViewController.h" #import "KLProxy.h" #import "Dog.h" #import "Cat.h" @interface ViewController ()@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. Dog * dog = [Dog new]; Cat * cat = [Cat new]; KLProxy * proxy = [KLProxy alloc]; [proxy transform:cat]; [proxy performSelector:@selector(eat:) withObject:nil]; } @end

2.cat.m 类

#import "Cat.h"@implementation Cat -(void)eat:(NSString*)str{ NSLog(@"猫吃~~~猫吃%@",str); } @end

3.Dog.m

#import "Dog.h"@implementation Dog -(void)wang:(NSString*)str{ NSLog(@"狗叫~~~狗叫%@",str); } @end

proxy.h

@interface KLProxy : NSProxy-(void)transform:(NSObject*)objc; @end

proxy.m

#import "KLProxy.h"@interface KLProxy()@property(nonatomic,strong)NSObject * objc; @end@implementation KLProxy-(void)transform:(NSObject*)objc{ self.objc = objc; } -(void)forwardInvocation:(NSInvocation *)invocation{ if(self.objc){ [invocation setTarget:self.objc]; if([self.objc isKindOfClass:[NSClassFromString(@"Cat") class]]){ NSString *str = @"拦截消息"; [invocation setArgument:&str atIndex:2]; }else{ NSString *str = @"我的小狗狗汪汪叫"; [invocation setArgument:&str atIndex:2]; } //开始调用方法 [invocation invoke]; } } -(NSMethodSignature *)methodSignatureForSelector:(SEL)sel{ NSMethodSignature * signature = nil; if([self.objc methodSignatureForSelector:sel]){ signature = [self.objc methodSignatureForSelector:sel]; }else{ signature = [super methodSignatureForSelector:sel]; } return signature; }@end

【iOS|iOS NSProxy使用】https://www.jianshu.com/p/923f119333d8
proxy解决NSTimer循环引用的应用
https://www.jianshu.com/p/fca3bdfca42f