ARC警告-“刪除未使用的自動發行版本不安全”

Question

我收到以下警告，但不知道從哪里開始，有什么想法嗎？

NSObject+Be.m:36:3: [rewriter] it is not safe to remove an unused 'autorelease' message; its receiver may be destroyed immediately
NSObject+Be.m:35:40: [rewriter] NSInvocation's getReturnValue is not safe to be used with an object with ownership other than __unsafe_unretained
NSObject+Be.m:36:4: ARC forbids explicit message send of 'autorelease'

代碼來自這里.... https://github.com/tylerneylon/moriarty/blob/c0d6daf65d86c22b8e5853aef00980f059c92fbc/NSObject%2BBe.m

#import "NSObject+Be.h"

@interface BeProxy : NSProxy {
  id target;
}

+ (BeProxy *)beProxyForClass:(Class)class;

- (void)forwardInvocation:(NSInvocation *)anInvocation;
- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector;

@end

@implementation BeProxy

+ (BeProxy *)beProxyForClass:(Class)class {
  BeProxy *beProxy = [BeProxy alloc];
  beProxy->target = [class alloc];
  return beProxy;
}
//

// We assume the method called is an init method.  The return value
// may be a new value for self.
- (void)forwardInvocation:(NSInvocation *)anInvocation {
  [anInvocation setTarget:target];
  [anInvocation invoke];
  id object;
  [anInvocation getReturnValue:(void *)&object];   //HERE
  [object autorelease];                            //HERE
  [self release];
}

- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector {
  return [target methodSignatureForSelector:aSelector];
}

@end

//    


@implementation NSObject (Be)

+ (id)be {
  return [BeProxy beProxyForClass:[self class]];
}

+ (id)beInit {
  return [[[self class] new] autorelease];
}

- (id)beCopy {
  return [[self copy] autorelease];
}

@end

Answer 1

從文檔中：

NSObject + Be此類別旨在幫助內存管理。 特別是，這使得僅使用少數允許所有權的方法之外的自動發布的對象變得容易。

因此，發布的代碼有助於手動保留計數內存管理。 那就不要用ARC編譯它。