mirror of
https://github.com/Swiftgram/Telegram-iOS.git
synced 2025-09-11 23:14:48 +00:00
86d2ab617e
* I didn't really understand NSProxy But I think I do now :) Previously I inherited from NSObject because I didn't think I needed anything fancy, but it turns out NSProxy is *less* fancy than NSObject and allows for overriding more methods. This change is probably purely academic in that we don't use this class to forward NSObject specific messages, but I believe this is the 'right thing'. * Update comment, thanks @maicki!
56 lines
1.9 KiB
Objective-C
56 lines
1.9 KiB
Objective-C
//
|
|
// ASWeakProxy.m
|
|
// AsyncDisplayKit
|
|
//
|
|
// Created by Garrett Moon on 4/12/16.
|
|
//
|
|
// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
//
|
|
|
|
#import "ASWeakProxy.h"
|
|
|
|
@implementation ASWeakProxy
|
|
|
|
- (instancetype)initWithTarget:(id)target
|
|
{
|
|
if (self) {
|
|
_target = target;
|
|
}
|
|
return self;
|
|
}
|
|
|
|
+ (instancetype)weakProxyWithTarget:(id)target
|
|
{
|
|
return [[ASWeakProxy alloc] initWithTarget:target];
|
|
}
|
|
|
|
- (id)forwardingTargetForSelector:(SEL)aSelector
|
|
{
|
|
return _target;
|
|
}
|
|
|
|
- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector
|
|
{
|
|
// Check for a compiled definition for the selector
|
|
NSMethodSignature *methodSignature = [[_target class] instanceMethodSignatureForSelector:aSelector];
|
|
|
|
// Unfortunately, in order to get this object to work properly, the use of a method which creates an NSMethodSignature
|
|
// from a C string. -methodSignatureForSelector is called when a compiled definition for the selector cannot be found.
|
|
// This is the place where we have to create our own dud NSMethodSignature. This is necessary because if this method
|
|
// returns nil, a selector not found exception is raised. The string argument to -signatureWithObjCTypes: outlines
|
|
// the return type and arguments to the message. To return a dud NSMethodSignature, pretty much any signature will
|
|
// suffice. Since the -forwardInvocation call will do nothing if the delegate does not respond to the selector,
|
|
// the dud NSMethodSignature simply gets us around the exception.
|
|
return methodSignature ?: [NSMethodSignature signatureWithObjCTypes:"@^v^c"];
|
|
}
|
|
|
|
- (void)forwardInvocation:(NSInvocation *)invocation
|
|
{
|
|
// If we are down here this means _target where nil. Just don't do anything to prevent a crash
|
|
}
|
|
|
|
@end
|