クラスのプロパティ一覧が欲しくなりましたので、以下のカテゴリ拡張を作りました。
MMPropertyUtil.h
//
// MMPropertyUtil.h
// MoyaMap
//
// Created by Haruyuki Seki on 2/16/13.
// Copyright (c) 2013 Hacker's Cafe. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface NSObject (MMPropertyUtil)
+ (NSDictionary *)properties;
@end
MMPropertyUtil.m
//
// MMPropertyUtil.m
// MoyaMap
//
// http://stackoverflow.com/questions/754824/get-an-object-attributes-list-in-objective-c
//
// Created by Haruyuki Seki on 2/16/13.
// Copyright (c) 2013 Hacker's Cafe. All rights reserved.
//
#import "MMPropertyUtil.h"
#import "objc/runtime.h"
@implementation NSObject (MMPropertyUtil)
static const char * getPropertyType(objc_property_t property) {
const char *attributes = property_getAttributes(property);
printf("attributes=%s\n", attributes);
char buffer[1 + strlen(attributes)];
strcpy(buffer, attributes);
char *state = buffer, *attribute;
while ((attribute = strsep(&state, ",")) != NULL) {
if (attribute[0] == 'T' && attribute[1] != '@') {
// it's a C primitive type:
/*
if you want a list of what will be returned for these primitives, search online for
"objective-c" "Property Attribute Description Examples"
apple docs list plenty of examples of what you get for int "i", long "l", unsigned "I", struct, etc.
*/
return (const char *)[[NSData dataWithBytes:(attribute + 1) length:strlen(attribute) - 1] bytes];
}
else if (attribute[0] == 'T' && attribute[1] == '@' && strlen(attribute) == 2) {
// it's an ObjC id type:
return "id";
}
else if (attribute[0] == 'T' && attribute[1] == '@') {
// it's another ObjC object type:
return (const char *)[[NSData dataWithBytes:(attribute + 3) length:strlen(attribute) - 4] bytes];
}
}
return "";
}
+ (NSDictionary *)properties
{
NSMutableDictionary *results = [[NSMutableDictionary alloc] init];
unsigned int outCount, i;
objc_property_t *properties = class_copyPropertyList(self, &outCount);
for (i = 0; i < outCount; i++) {
objc_property_t property = properties[i];
const char *propName = property_getName(property);
if(propName) {
const char *propType = getPropertyType(property);
NSString *propertyName = [NSString stringWithUTF8String:propName];
NSString *propertyType = [NSString stringWithUTF8String:propType];
[results setObject:propertyType forKey:propertyName];
}
}
free(properties);
// returning a copy here to make sure the dictionary is immutable
return [NSDictionary dictionaryWithDictionary:results];
}
@end
作ったと言っても、
http://stackoverflow.com/questions/754824/get-an-object-attributes-list-in-objective-c
で見つけたのをそのまま使っただけですが・・・
[MyClass properties]
で、MyClass のプロパティ一覧を NSDictionary で取得できます。