Question

任何人都可以帮我解释如何在点击按钮时按下表格视图。我想从NSMutableArray加载消息到表视图单元格，NSMutableArray加载从URL解析的数据..

-(IBAction)readMessages:(id)sender
{
    // i want to push the tableview when clicking the button in relation with this method
    // WHAT MUST I DO HERE?

   }

而不是问一个新问题，我喜欢编辑这个问题，因为事情是在同一个方面.. 我现在可以以编程方式创建tableview，但我无法使用从Json数组获得的数据初始化其单元格。这是我的代码：

NSString *str1=[@"?username=" stringByAppendingString:userNameField.text];
        NSString *str2=[@"&password=" stringByAppendingString:passwordField.text];
        NSString *str3=[str1 stringByAppendingString:str2];
        NSString *str4 =[@"http://" stringByAppendingString:serverField.text];


        NSURL *url=[NSURL URLWithString:[str4 stringByAppendingString:[@"/ipad/login.php" stringByAppendingString:str3]]];
        //get the url to jsondata
        NSData *jSonData=[NSData dataWithContentsOfURL:url];

        if (jSonData!=nil) {
            NSError *error=nil;
            id result=[NSJSONSerialization JSONObjectWithData:jSonData options:
                       NSJSONReadingMutableContainers error:&error];
            if (error==nil) {
                NSDictionary *mess=[result objectForKey:@"message"];
                NSDictionary *messContent=[mess valueForKeyPath:@"message"];
                NSDictionary *messID=[mess valueForKeyPath:@"ID"];
                NSString*key1=[ result objectForKey:@"key" ];                
                NSString *s1=[@"http://" stringByAppendingString:serverField.text];
                NSString *s2=[s1 stringByAppendingString:@"/ipad/button.php"];
                NSURL *url2=[NSURL URLWithString:[s2 stringByAppendingString:[@"?key=" stringByAppendingString:key1]]];

                NSData *data2=[NSData dataWithContentsOfURL:url2];
                id result2=[NSJSONSerialization JSONObjectWithData:data2 options:NSJSONReadingMutableContainers error:nil];

                 mesID = [NSMutableArray array];//saving meesage ID s to NSMutableArray
                 content = [NSMutableArray array];    
               // i logged here and it saves  the data, now i want to display my data in table view

                for (NSDictionary *data in mess) {
                    [mesID addObject:[data objectForKey:@"ID"]];
                    [content addObject:[data objectForKey:@"message"]];        
                    [[NSUserDefaults standardUserDefaults] setObject:messID forKey:@"message"];
                    [[NSUserDefaults standardUserDefaults] setObject:messContent forKey:@"messContent"];

                    //messID will be saved as the Title of the cells and messContent will be displayed as the text area of that cell, opening in a new view

这是输出，我想将单元格的标题设置为ID，将其内容设置为文本：

  2012-01-17 16:26:59.873 ipad_Teslim[940:f803] MessID: (
        1,
        3
    )
    2012-01-17 16:26:59.875 ipad_Teslim[940:f803] Content: (
        asdf,
        "this is a test"
    )

正如我在我的代码中提到的那样，messID将被保存为单元格的标题，messContent将显示为该单元格的文本区域，以新视图打开。我现在该怎么办？请帮助我，那里有很多教程，我看了很多，但无法解决这个问题。

Answer 1

试试这个：

-(IBAction)readMessages:(id)sender {

    SecondView *secondView =[[SecondView alloc] initWithNibName:@"SecondView" bundle:nil];

    [self presentModalViewController:secondView animated:YES];    

  }

SecondView是你的UIViewController子类，它包含一个UITableView。

Answer 2

如果您有导航控件，并且如果您想通过导航推送，请尝试以下操作：

-(IBAction)readMessages:(id)sender {
 NextView *next = [[NextView alloc]initWithNibName:@"NextView" bundle:nil];
        [self.navigationController pushViewController:next animated:YES];
        [next release];
}

如果你没有导航控件，如果你想只显示下一个视图，请尝试以下操作：

-(IBAction)readMessages:(id)sender {

    NextView *next =[[NextView alloc] initWithNibName:@"NextView" bundle:nil];

    [self presentModalViewController:next animated:YES]; 
           [next release];
  }

如果您在同一个班级中有子视图，请尝试以下操作：

-(IBAction)readMessages:(id)sender {

      [self.view addsubview nextView];
      }

Answer 3

是的你可以，尝试在viewDidload中以编程方式创建xib：

UIView *view1 = [[UIView alloc]initWithFrame:CGRectMake(10, 10,300,460)];
    view1.backgroundColor = [UIColor redColor];
    [self.view addSubview:view1];

但最好通过使用来创建跟随xcode菜单中的路径：

文件＆GT;新 - ＆gt; NewFile - ＆gt; UIViewControllerSubClass - ＆gt;下一步 - ＆gt;下一步 - ＆gt;创建

或简单地拖拽＆amp;从您的Interface Builder中删除视图

Answer 4

Q1：您无需添加导航即可返回主页面。什么时候使用

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

默认情况下，它会在下一个视图中创建后退导航以推回返回。

如果尚未创建，请在下一个视图中尝试以下代码：

- (void)viewDidLoad
{
    [super viewDidLoad];

    //To set the back buttin on leftside of Navigation bar
    UIBarButtonItem *backButton = [[[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleDone target:self action:@selector(backclick:)] autorelease];
    self.navigationItem.leftBarButtonItem = backButton;

}

- (IBAction)backclick:(id)sender //first declrared in .h file
{
    // To goback to the previous view
    [self.navigationController popViewControllerAnimated:YES];
}

Answer 5

Q2：你可以使用JSONArray初始化你的tableView单元格：

 (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return [JSONarray count]; //***********
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) 
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];


       cell.textLabel.text = [JSONarray objectAtIndexIndexPath.row]; //***********
}

如何在单击按钮时推送TableView并使用NSDictionary初始化TableViewCell？

5 个答案: