Question

我是目标c的新手，仍然试图找出整个目标导向的想法。在我的应用程序中，我有一个在所有页面中使用的复选标记（如）按钮，因此我不想在每个视图中使用复选标记方法，而是将它们移动到自己的类并调用它们。我该怎么做？

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object
{
    ...

    //create check mark button
    UIButton *checkButton = [[UIButton alloc] initWithFrame:CGRectMake(270, 0, 50, 90)];
    //user has already check marked post
    if ([checkActivityArray containsObject:[object objectId]]){
        [checkButton setTitleColor: [UIColor blueColor] forState:UIControlStateNormal];
        [checkButton addTarget:self action:@selector(minusCheckMark:) forControlEvents:UIControlEventTouchUpInside];
    }
    //user has NOT already check marked post
    else{
        [checkButton setTitleColor: [UIColor grayColor] forState:UIControlStateNormal];
        [checkButton addTarget:self action:@selector(addCheckMark:) forControlEvents:UIControlEventTouchUpInside];
    }
    [checkButton setTitle:@"CH" forState:UIControlStateNormal];
    [checkButton setTag:indexPath.row];
    [cell.contentView addSubview:checkButton];

    ...

    return cell;
}



 - (void)addCheckMark:(UIButton*)button{

    [button setTitleColor: [UIColor blueColor] forState:UIControlStateNormal];

    PFObject *place = [placesArray objectAtIndex:[button tag]];
    PFObject *checkActivity = [PFObject objectWithClassName:@"activity"];
    [checkActivity setObject:place forKey:@"place"];
    [checkActivity setObject:@"checkMark" forKey:@"type"];
    [checkActivity setObject:[PFUser currentUser] forKey:@"fromUser"];
    [checkActivity setObject:[place objectForKey:@"user"] forKey:@"toUser"];
    [checkActivity saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        if (!error){
            NSLog(@"Check marked post");

            //add post to checkActivity array
            [checkActivityArray addObject:[place objectId]];
            [checkActivityArray writeToFile:checkMarkArrayFileName atomically:YES];


            //increase check mark count
            PFObject *checkCount = [placesArray objectAtIndex:[button tag]];
            [checkCount incrementKey:@"checkMarkCount"];
            [checkCount saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
                if (!error)
                    [self.tableView reloadRowsAtIndexPaths: [NSArray arrayWithObject:[NSIndexPath indexPathForRow: [button tag] inSection:0]] withRowAnimation:NO];
            }];
        }
        else
            NSLog(@"%@", error);
    }];
}


    - (void)minusCheckMark:(UIButton*)button{

    [button setTitleColor: [UIColor grayColor] forState:UIControlStateNormal];

    PFObject *place = [placesArray objectAtIndex:[button tag]];
    PFQuery *queryCheckActivity = [PFQuery queryWithClassName:@"activity"];
    [queryCheckActivity whereKey:@"place" equalTo:place];
    [queryCheckActivity whereKey:@"type" equalTo:@"checkMark"];
    [queryCheckActivity whereKey:@"fromUser" equalTo:[PFUser currentUser]];
    [queryCheckActivity findObjectsInBackgroundWithBlock:^(NSArray *activities, NSError *error) {
        if (!error) {
            for (PFObject *activity in activities) {
                [activity delete];
            }

            //pemove post from checkActivity array
            [checkActivityArray removeObject:[place objectId]];
            [checkActivityArray writeToFile:checkMarkArrayFileName atomically:YES];

            //decrease check mark count
            PFObject *checkCount = [placesArray objectAtIndex:[button tag]];
            [checkCount incrementKey:@"checkMarkCount" byAmount:[NSNumber numberWithInt:-1]];
            [checkCount saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
                if (!error)
                    [self.tableView reloadRowsAtIndexPaths: [NSArray arrayWithObject:[NSIndexPath indexPathForRow: [button tag] inSection:0]] withRowAnimation:NO];
            }];
        }
        else
            NSLog(@"%@", error);
    }];
}

Answer 1

创建一个UIButon类，将其添加到您需要添加的视图中，＆amp;和其他解决方案是添加按钮window或navigation controler。

如何将这些方法移动到自己的类中？

1 个答案: