参考小示例,代码如下:
#import <Foundation/Foundation.h>
@interface PlayList:NSObject
@property NSMutableArray *ary;
@end
@implementation PlayList
-(id)init{
self = [super init];
if(self){
_ary = [NSMutableArray array];
}
return self;
}
-(NSMethodSignature *)methodSignatureForSelector:(SEL)selector{
NSString *sel_name = NSStringFromSelector(selector);
NSLog(@"%s:%@",__func__,sel_name);
NSMethodSignature *sig = [_ary methodSignatureForSelector:selector];
if(sig){
//NSLog(@"%s:%@",__func__,sig);
show_sig([sel_name UTF8String],sig);
return sig;
}
return [super methodSignatureForSelector:selector];
}
-(void)forwardInvocation:(NSInvocation *)x{
NSLog(@"%s:%@",__func__,x);
[x invokeWithTarget:_ary];
}
void show_sig(const char* sig_name,NSMethodSignature *sig){
const char *ret_type = [sig methodReturnType];
NSUInteger arg_count = [sig numberOfArguments];
NSLog(@"show sig for #%s# :",sig_name);
NSLog(@"ret_type:%s , stack_len:%lu argc:%lu",ret_type,[sig frameLength],arg_count);
for(int i = 0;i<arg_count;i++){
printf("arg %d : %s ",i,[sig getArgumentTypeAtIndex:i]);
}
puts("");
}
-(NSUInteger)countOfAry{
return [_ary count];
}
-(NSString *)description{
NSLog(@"enter %s",__func__);
return [NSString stringWithFormat:@"%@:%@",[self class],self.ary];
}
@end
int main(void){
@autoreleasepool{
PlayList *pl = [PlayList new];
id ary_proxy = [pl mutableArrayValueForKey:@"ary"];
NSLog(@"count is %ld(%ld)",[ary_proxy count],[pl countOfAry]);
NSLog(@"%@",pl);
id obj = pl;
[obj addObject:@"hello"];
[obj addObject:@"love"];
//[obj love:@"panda" and:@"penguin"];
NSLog(@"%@ has %lu",obj,[obj count]);
}
return 0;
}