将按下的按钮传递给另一个 View JSON

Question

我在一个视图中有一个 NSMutableArray，我将一些 JSON 数据解析为一个表视图。我在底部也有三个按钮：按钮 1、按钮 2、按钮 3。如果我选​​择按钮 2，JSON 数据字符串将更改为链接 2 等...

现在，当我单击一个单元格时，值（文本）传递到第二个视图控制器中的 UITextView。但我想要的是也传递按下的按钮，因此 UITextView 的字符串名称解析正确。因为现在，当我选择例如按钮 2 并单击一个单元格时，第二个视图控制器上的文本视图变为空白，因为我只将字符串名称设置为 @"message"，并在选择按钮 2 时将文本的字符串名称设置为是@“推文”。

这是我的代码：

@interface DEMOSecondViewController () 

@end

@implementation DEMOSecondViewController
@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView;
@synthesize fontForCellText;
@synthesize btnFaceBook, btnTwitter, btnTwitter2;
@synthesize strURLToLoad;
@synthesize movies;

- (IBAction)showButtonMenu {
    [self.frostedViewController presentMenuViewController];
}

- (void)refresh:(UIRefreshControl *)refreshControl {
    [refreshControl endRefreshing];
}

-(UIStatusBarStyle)preferredStatusBarStyle{
    return UIStatusBarStyleLightContent;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
    [refreshControl setTintColor:[UIColor greenColor]];
    [refreshControl addTarget:self action:@selector(refresh:) forControlEvents:UIControlEventValueChanged];
    [self.tableView addSubview:refreshControl];

    strURLToLoad = [[NSMutableString alloc] init];

    [btnFaceBook setTitle:@"link-1.com/json.php" forState:UIControlStateDisabled];
    [btnTwitter setTitle:@"link-2.com/json.php" forState:UIControlStateDisabled];
    [btnTwitter2 setTitle:@"link-3.com/json.php" forState:UIControlStateDisabled];

    [btnFaceBook setBackgroundImage:[UIImage imageNamed:@"tab_selected.png"] forState:UIControlStateNormal];
    [btnFaceBook setBackgroundImage:[UIImage imageNamed:@"tab_unselected.png"] forState:UIControlStateSelected];

    [btnTwitter setBackgroundImage:[UIImage imageNamed:@"tab_selected.png"] forState:UIControlStateNormal];
    [btnTwitter setBackgroundImage:[UIImage imageNamed:@"tab_unselected.png"] forState:UIControlStateSelected];

    [btnTwitter2 setBackgroundImage:[UIImage imageNamed:@"tab_selected.png"] forState:UIControlStateNormal];
    [btnTwitter2 setBackgroundImage:[UIImage imageNamed:@"tab_unselected.png"] forState:UIControlStateSelected];



    NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil];
    PostsObject *cell = [nib objectAtIndex:0];
    fontForCellText = cell.title.font;
    cellTextWidth = cell.title.frame.size.width;
    cellHeightExceptText = cell.frame.size.height - cell.title.frame.size.height;

    [self.navigationController setNavigationBarHidden:YES];

    self.tableView.separatorColor = [UIColor clearColor];

    // Setting Up Activity Indicator View
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

    self.activityIndicatorView.color = [UIColor greenColor];


    self.activityIndicatorView.hidesWhenStopped = YES;
    self.activityIndicatorView.center = self.view.center;
    [self.view addSubview:self.activityIndicatorView];
    [self.activityIndicatorView startAnimating];
    self.tableView.separatorColor = [UIColor clearColor];

    // Initializing Data Source
    movies = [[NSMutableArray alloc] init];

    [self btnFromTabBarClicked:btnFaceBook];
}

- (void)loadJSONFromCurrentURL
{
    [self.activityIndicatorView startAnimating];

    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:strURLToLoad]];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        [movies setArray:JSON];
        [self.activityIndicatorView stopAnimating];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
}

//This is where I change the data source when selecting a button
- (IBAction)btnFromTabBarClicked:(UIButton *)sender
{
    btnFaceBook.selected = btnTwitter.selected = btnTwitter2.selected = NO;

    sender.selected = YES;

    [strURLToLoad setString:[sender titleForState:UIControlStateDisabled]];

    [self loadJSONFromCurrentURL];
}

// Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return movies.count;

}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

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

    if(indexPath.row == 0) {
        static NSString *Identifier1 = @"TableHeaderView";


        TableHeaderView *cell = [tableView dequeueReusableCellWithIdentifier:Identifier1];
        if (cell == nil) {
            NSArray *nib= [[NSBundle mainBundle] loadNibNamed:@"TableHeaderView" owner:self options:nil];
            cell = (TableHeaderView *)[nib objectAtIndex:0];
            cell.selectionStyle = UITableViewCellSelectionStyleNone;

            cell.backgroundColor = [UIColor clearColor];
            return cell;
        }

    } else {
        static NSString *Identifier2 = @"PostsObject";

        PostsObject *cell = [tableView dequeueReusableCellWithIdentifier:Identifier2];
        if (cell == nil) {
            NSArray *nib= [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil];
            cell = (PostsObject *)[nib objectAtIndex:0];
            cell.backgroundColor = [UIColor clearColor];
        }

        NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
        NSString *strText = [movie objectForKey:[self getTextKey]];

        CGRect rect = cell.title.frame;
        rect.size.height = [self getHeightForText:strText];
        cell.title.frame = rect;
        cell.title.text = strText;
        cell.arrow.center = CGPointMake(cell.arrow.frame.origin.x, rect.origin.y + rect.size.height/2);
        cell.published.text = [movie objectForKey:[self getPostedTime]];
        cell.twitterName.text = [movie objectForKey:[self getTwitterName]];

        return cell;

    }
    return 0;
}

//Here I am passing the selected cell data to (PostsNextView). I want to pass the string values of button 1, button 2 and button 3. How?
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
    PostsNextView *newView = [[PostsNextView alloc] init];
    newView.theMovie = movie;
    [self.navigationController pushViewController:newView animated:YES];
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if(indexPath.row == 0) {
        return 224;

    } else {
        NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
        NSString *strText = [movie objectForKey:[self getTextKey]];

        CGFloat cellHeight = cellHeightExceptText + [self getHeightForText:strText];
        return cellHeight;
    }

}

- (NSString *)getTextKey
{
    return btnTwitter.selected?@"tweet":@"message";
}

- (NSString *)getPostedTime
{
    return btnTwitter.selected?@"posted":@"published";
}

- (NSString *)getTwitterName
{
    return btnTwitter2.selected?@"user":@"celebname";
}

- (CGFloat)getHeightForText:(NSString *)strText
{
    CGSize constraintSize = CGSizeMake(cellTextWidth, MAXFLOAT);
    CGSize labelSize = [strText sizeWithFont:fontForCellText constrainedToSize:constraintSize lineBreakMode:NSLineBreakByWordWrapping];
    NSLog(@"labelSize.height = %f",labelSize.height);
    return labelSize.height;
}

@end

正如您在第一个视图中看到的那样，我正在解析 3 个不同的链接。如何在 PostsNextView 的 viewDidLoad 中设置 if 语句？比如，如果选择了 btnFacebook： textView.text = [theMovie objectForKey:@"message"];如果选择 btnTwitter： textView.text = [theMovie objectForKey:@"tweet"]; ?

非常感谢您的解决方案！

Answer 1

修订后的答案（这将是高级别的）：

• 为每个按钮添加标签值
• 当一个按钮被点击时，您可以通过 getTag（也可以通过 setTag 设置标签）调用获取它的标签 - 请查看 API 了解详情

当您在创建下一个视图控制器时以编程方式加载它

PostsNextView *newView = [[PostsNextView alloc] init];
newView.theMovie = movie;
// You could add a call here to set the value
[newView setTheVaue:valueIWantToSet]

• 您将在 newView 控制器中创建一个名为 TheValue 的属性

当您实际调用更改为新的视图控制器时

    [self.navigationController pushViewController:newView animated:YES];

您想要的数据值已经设置好了。