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76 lines
2.5 KiB
Objective-C
76 lines
2.5 KiB
Objective-C
//
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// ASWeakProxy.m
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// AsyncDisplayKit
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//
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// Created by Garrett Moon on 4/12/16.
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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#import <AsyncDisplayKit/ASWeakProxy.h>
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#import <AsyncDisplayKit/ASObjectDescriptionHelpers.h>
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#import <AsyncDisplayKit/ASAssert.h>
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@implementation ASWeakProxy
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- (instancetype)initWithTarget:(id)target
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{
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if (self) {
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_target = target;
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}
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return self;
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}
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+ (instancetype)weakProxyWithTarget:(id)target
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{
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return [[ASWeakProxy alloc] initWithTarget:target];
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}
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- (id)forwardingTargetForSelector:(SEL)aSelector
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{
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return _target;
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}
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- (BOOL)respondsToSelector:(SEL)aSelector
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{
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return [_target respondsToSelector:aSelector];
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}
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- (BOOL)conformsToProtocol:(Protocol *)aProtocol
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{
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return [_target conformsToProtocol:aProtocol];
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}
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/// Strangely, this method doesn't get forwarded by ObjC.
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- (BOOL)isKindOfClass:(Class)aClass
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{
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return [_target isKindOfClass:aClass];
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}
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- (NSString *)description
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{
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return ASObjectDescriptionMake(self, @[@{ @"target": _target ?: (id)kCFNull }]);
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}
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- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel
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{
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ASDisplayNodeAssertNil(_target, @"ASWeakProxy got %@ when its target is still alive, which is unexpected.", NSStringFromSelector(_cmd));
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// Unfortunately, in order to get this object to work properly, the use of a method which creates an NSMethodSignature
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// from a C string. -methodSignatureForSelector is called when a compiled definition for the selector cannot be found.
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// This is the place where we have to create our own dud NSMethodSignature. This is necessary because if this method
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// returns nil, a selector not found exception is raised. The string argument to -signatureWithObjCTypes: outlines
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// the return type and arguments to the message. To return a dud NSMethodSignature, pretty much any signature will
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// suffice. Since the -forwardInvocation call will do nothing if the target does not respond to the selector,
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// the dud NSMethodSignature simply gets us around the exception.
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return [NSMethodSignature signatureWithObjCTypes:"@^v^c"];
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}
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- (void)forwardInvocation:(NSInvocation *)invocation
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{
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ASDisplayNodeAssertNil(_target, @"ASWeakProxy got %@ when its target is still alive, which is unexpected.", NSStringFromSelector(_cmd));
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}
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@end
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