ios - 访问单例类时 View 卡住几秒钟

Question

这是我正在使用的方法

 +(dataHandler *)getDataHandler
    {

        dispatch_once(&internalOnceToken,^{
            internalInstance = [[dataHandler alloc] init];
            if(internalInstance) {
                NSLog(@"Internal instance created: %@", internalInstance);
            }
        });
        if(internalOnceToken == -1)
        {
            NSLog(@"Internal instance exists: %@", internalInstance);
        }
        return internalInstance;

    }

我尝试使用dispatch_asyn，但它不是静态分配，在我的主屏幕中，我可以访问所有数据并存储在我的单例类中。

但是当我尝试从一个 View Controller 转到主屏幕时，它会挂起几秒钟，如何克服这个问题？

调用单例方法:

 -(void)responseFunction:(NSMutableDictionary *)response
    {
            BOOL sucess;
            sucess =[[response objectForKey:@"sucess"]boolValue];
            NSLog(@"response Method%@",response);
            NSString *subimages;

            if(!sucess)
            {
                //storing response data to singleton class.
             }
         [self datahandlers];//here i am calling singleton.
    }

存储后，我在 View 中调用单例类加载方法

if([file.dicCategoryDetails count]!=0&&[file.dicProductDetails count]!=0)
    {
        [self datahandlers];
    }

这是数据处理方法

-(void)datahandlers
{
    for(NSDictionary *diccategory in file.categoryArr)
    {
        NSMutableDictionary *dicparsing=[[NSMutableDictionary alloc]init];
        [dicparsing setObject:[diccategory objectForKey:@"category"] forKey:@"category"];
        [dicparsing setObject:[diccategory objectForKey:@"name"] forKey:@"name"];
        [dicparsing setObject:[diccategory objectForKey:@"image"] forKey:@"image"];
        [dicparsing setObject:[diccategory objectForKey:@"subcategory"] forKey:@"subcategory"];
        [ArrName addObject:dicparsing];

    }
    NSLog(@"inside data handler%@",ArrName);
    [collectionview reloadData];
    [self scrollView];

}

View 中已加载

 file= [dataHandler getDataHandler];

Answer 1

最后我只使用dispatch_async(dispatch_get_main_queue(),^{})

 if([file.dicCategoryDetails count]!=0&&[file.dicProductDetails count]!=0)
    {
        dispatch_async(dispatch_get_main_queue(), ^{

                   [self datahandlers];
                });

    }