Created
July 26, 2010 03:08
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JSProtocolChecker = NSProtocolChecker that works on iOS. Maybe some day I'll find a use for this.
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| // | |
| // JSProtocolChecker.h | |
| // | |
| // Created by Jon on 7/25/10. | |
| // Copyright (c) 2010 Jonathan Sterling. All rights reserved. | |
| // | |
| #import <Foundation/Foundation.h> | |
| @interface JSProtocolChecker : NSProxy | |
| @property (nonatomic, readonly) NSObject *target; | |
| @property (nonatomic, readonly) Protocol *protocol; | |
| + protocolCheckerWithTarget:(NSObject *)aTarget protocol:(Protocol *)aProtocol; | |
| + (Class)protocolCheckerWithClass:(Class)aClass protocol:(Protocol *)aProtocol; | |
| - initWithTarget:(NSObject *)aTarget protocol:(Protocol *)aProtocol; | |
| @end |
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| // | |
| // JSProtocolChecker.m | |
| // | |
| // Created by Jon on 7/25/10. | |
| // Copyright (c) 2010 Jonathan Sterling. All rights reserved. | |
| // | |
| #import "JSProtocolChecker.h" | |
| #import <objc/runtime.h> | |
| #import <objc/Protocol.h> | |
| @implementation JSProtocolChecker | |
| @synthesize target; | |
| @synthesize protocol; | |
| + protocolCheckerWithTarget:(NSObject *)aTarget protocol:(Protocol *)aProtocol { | |
| return [[[self alloc] initWithTarget:aTarget protocol:aProtocol] autorelease]; | |
| } | |
| + (Class)protocolCheckerWithClass:(Class)aClass protocol:(Protocol *)aProtocol { | |
| return (Class)[[[self alloc] initWithTarget:(id)aClass protocol:aProtocol] autorelease]; | |
| } | |
| - initWithTarget:(NSObject *)aTarget protocol:(Protocol *)aProtocol { | |
| self->target = [[aTarget retain] autorelease]; | |
| self->protocol = aProtocol; | |
| return self; | |
| } | |
| - forwardingTargetForSelector:(SEL)aSelector { | |
| id ret = nil; | |
| BOOL (^hasMethod)(BOOL,BOOL) = ^(BOOL isRequired, BOOL isInstance) { | |
| typedef struct objc_method_description omd; | |
| uint outCount = 0; | |
| omd *methods = protocol_copyMethodDescriptionList(self.protocol, isRequired, isInstance, &outCount); | |
| BOOL result = NO; | |
| for (int i = 0; i < outCount; i++) { | |
| if (sel_isEqual(aSelector, methods[i].name)){ result = YES; break; } | |
| } | |
| return result; | |
| }; | |
| if (hasMethod(YES,YES) || hasMethod(NO,YES) || hasMethod(YES,NO) || hasMethod(NO,NO)) { | |
| ret = self.target; | |
| } | |
| return ret; | |
| } | |
| - (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector { | |
| return [self.target methodSignatureForSelector:aSelector]; | |
| } | |
| @end |
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