ios runtime 動態向類添加方法

1、定義C函數：

void dynamicMethodIMP(idself, SEL _cmd)

{

NSLog(@"蝸牛也瘋狂");

}

2、重寫函數+(BOOL)resolveInstanceMethod:(SEL)sel

+(BOOL)resolveInstanceMethod:(SEL)sel

{

class_addMethod([selfclass], sel, (IMP)dynamicMethodIMP,"v@:");

return [superresolveInstanceMethod:sel];

}

3、使用：

SEL select =NSSelectorFromString(@"resolveThisMethodDynamically");

[classresolveInstanceMethod:select];

[[class instance] performSelector:select];