将对象转换成字典

#import <objc/runtime.h>

// 通过对象返回一个NSDictionary ,键是属性名称 ，值是属性值

+(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];
}