#import <Foundation/Foundation.h>
@interface Dog : NSObject
@end _______________________________________________
#import "Dog.h" #import <UIKit/UIKit.h> #import <objc/message.h>
@implementation Dog
//当类方法或对象方法没有实现就会调用这两个方法中的一个 //处理类方法 //+(BOOL)resolveClassMethod:(SEL)sel //处理对象方法 //+(BOOL)resolveInstanceMethod:(SEL)sel
+(BOOL)resolveInstanceMethod:(SEL)sel {
NSLog(@"%@方法没有实现",NSStringFromSelector(sel)); if (sel == @selector(wangwangwang:)) { //动态添加方法 /* cls: 类类型 name: 方法编号 imp： 方法实现，函数指针 types： 函数类型 C字符串（Code）void === "v" */ class_addMethod([Dog class], sel, (IMP)wangwangwang, "v@:@"); } else if( sel ==@selector(wangwangwang1) ){ //参数意义具体参考官方文档 class_addMethod([Dog class], sel, (IMP)wangwangwang1, "v@:"); } return [super resolveClassMethod:sel];}
void wangwangwang(id self, SEL _cmd,id obj) {
NSLog(@"带参数%@",obj);}
void wangwangwang1(id self, SEL _cmd) {
NSLog(@"不带参数");}
@end _______________________________________________ 调用 #import "HJViewController.h" #import "Dog.h" @interface HJViewController ()
@end
@implementation HJViewController
- (void)viewDidLoad { [super viewDidLoad];
//方法懒加载 动态添加方法 Dog *dog = [[Dog alloc]init]; [dog performSelector:@selector(wangwangwang1)]; [dog performSelector:@selector(wangwangwang:) withObject:@"汪汪汪"];}
@end
