Question

我在视图中有一个NSMutableArray，我将一些JSON数据解析为表视图。现在，当我单击一个单元格时，我想将所选单元格数组的值（文本）传递给另一个视图中的UITextView。

我存储数据的NSMutableArray称为电影。

这是第一个视图的代码：

@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" forState:UIControlStateDisabled];
    [btnTwitter setTitle:@"link-2" forState:UIControlStateDisabled];
    [btnTwitter2 setTitle:@"link-3" 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];

    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];

    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];
}

- (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;
}

//When I click on the cell, I want the selected cell-text to pass to another view
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    //How can I do this?
}

- (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":@"usernew";
}

- (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

到目前为止，第二个视图的代码如下所示：

@interface PostsNextView : UIViewController 

@property (nonatomic, retain) NSDictionary *theMovie;

@property (nonatomic, retain) IBOutlet UITextView *textView;

@end

那么如何从第一个视图中获取值并传递并显示在此文件的文本视图中？

Answer 1

添加到didSelectRowAtIndexPath代码：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    //get the data you want to pass
    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];

    // Allocate second view you want to open
    PostsNextView *newView = [[PostsNextView alloc] init];
    // pass the data 
    newView.theMovie = movie;
    // present view
    [self.navigationController pushViewController:newView animated:YES];
}

在viewDidLoad的PostsNextView.m文件中，您可以显示要显示的文本。

//扩展

添加属性以跟踪按下了哪个按钮：

@interface PostsNextView : UIViewController 

@property (nonatomic, retain) NSDictionary *theMovie;
@property (nonatomic, retain) IBOutlet UITextView *textView;
@property  int whichButton;

@end

在视图中加载了这一行：

newView.theMovie = movie;
newView.whichButton = _witchBtn;

在您的DEMOSecondViewController.m文件中添加ivar：

@implementation DEMOSecondViewController
{
    int _witchBtn;
}

并且在同一个文件中为_witchBtn分配值，例如0作为默认值（禁用所有按钮）如果你改变它让我们说Facebook分配_witchBtn = 1，如果twitter _witchBtn = 2等等。

在视图之间传递数据并将字符串加载到文本视图

1 个答案: