iOS 对象转换成字典

/**
*  对象转换为字典
*
*  @param obj 需要转化的对象
*
*  @return 转换后的字典
*/
+ (NSDictionary*)getObjectData:(id)obj {

NSMutableDictionary *dic = [NSMutableDictionary dictionary];
unsigned int propsCount;

objc_property_t *props = class_copyPropertyList([obj class], &propsCount);

for(int i = 0;i < propsCount; i++) {

objc_property_t prop = props[i];
NSString *propName = [NSString stringWithUTF8String:property_getName(prop)];
id value = [obj valueForKey:propName];
if(value == nil) {

value = [NSNull null];
} else {
value = [self getObjectInternal:value];
}
[dic setObject:value forKey:propName];
}

return dic;
}

+ (id)getObjectInternal:(id)obj {

if([obj isKindOfClass:[NSString class]]
||
[obj isKindOfClass:[NSNumber class]]
||
[obj isKindOfClass:[NSNull class]]) {

return obj;

}
if([obj isKindOfClass:[NSArray class]]) {

NSArray *objarr = obj;
NSMutableArray *arr = [NSMutableArray arrayWithCapacity:objarr.count];

for(int i = 0; i < objarr.count; i++) {

[arr setObject:[self getObjectInternal:[objarr objectAtIndex:i]] atIndexedSubscript:i];
}
return arr;
}
if([obj isKindOfClass:[NSDictionary class]]) {

NSDictionary *objdic = obj;
NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithCapacity:[objdic count]];

for(NSString *key in objdic.allKeys) {

[dic setObject:[self getObjectInternal:[objdic objectForKey:key]] forKey:key];
}
return dic;
}
return [self getObjectData:obj];

}