ios 反射机制--获取类的所有属性名

//LJModel是你需要Model类获取他的所有属性名

- (NSArray*)propertyKeys

{
    unsigned int outCount, i;
    
    objc_property_t *properties = class_copyPropertyList([ LJModel class], &outCount);
    
    NSMutableArray *keys = [[NSMutableArray alloc] initWithCapacity:outCount];
    
    for (i = 0; i < outCount; i++) {
        
        objc_property_t property = properties[i];
        
        NSString *propertyName = [[NSString alloc] initWithCString:property_getName(property) encoding:NSUTF8StringEncoding];
        
        [keys addObject:propertyName];
        
    }
    
    free(properties);
    
    return keys;
    
}