四十三、内存管理之(一)NSProxy

@interface MJProxy : NSProxy
+(instancetype)proxyWithTarget:(id)target;
@property (nonatomic,weak) id target;

@end

#import "MJProxy.h"

@implementation MJProxy
+ (instancetype)proxyWithTarget:(id)target{
    MJProxy *proxy = [MJProxy alloc];
    proxy.target = target;
    return proxy;
}

- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel{
    return [self.target methodSignatureForSelector:sel];
}

- (void)forwardInvocation:(NSInvocation *)invocation{
    [invocation invokeWithTarget:self.target];
}
@end