Question

我有两个视图控制器，FirstViewController和DetailViewController，来回切换。

在didSelectRowAtIndexPath方法中---＆gt; updateRowNumber：indexPath.row，我将选中的行号传递给DetailViewController。

第一次，它工作，FirstViewController可以将选定的行传递给DetailedViewController，来回切换后，它仍然得到最后一个选定的行。

谁知道我错过了什么？

#import "FirstViewController.h"
#import "AppDelegate.h"
#import "DetailViewController.h"
#import "PartyListCustomViewCell.h"

@interface FirstViewController ()

@end

@implementation FirstViewController

@synthesize dvController;  // it is a DetailViewController

- (void) viewDidLoad
{
contentArray = [[NSArray arrayWithObjects:@"heyun", @"wushi", @"ios", nil]retain];

[super viewDidLoad];

}


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void) dealloc
{
    [dvController release];
    [super dealloc];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear: animated];    
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear: animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear: animated];
}

- (void)viewDisDisappear:(BOOL)animated
{
    [super viewDidDisappear: animated];
}

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

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

    return [contentArray count];
}

// custom row height
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    // dynamic with whether the cell has the party image or not..
    return 160;
}

// Customize the appearance of table view cells
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:        (NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"PartyListCustomCell";

    PartyListCustomViewCell *plcc = [tableView     dequeueReusableCellWithIdentifier:CellIdentifier];

    if(plcc == nil)
    {
        plcc = [[[PartyListCustomViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }


    // set up custom cell
    plcc.partyTitle.text = @"partyTitle";


    return plcc;

}

- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

    if (dvController == nil)
    {
        DetailViewController *aController = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil];

        self.dvController = aController;

        [aController release];
    }   

    [dvController updateRowNumber:indexPath.row];
    [[self navigationController] pushViewController:dvController animated:YES];

}

@end



#import "DetailViewController.h"


@interface DetailViewController ()

@end

@implementation DetailViewController

@synthesize rowNumber;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) 
    {
        // Custom initialization
    }
    return self;
}

- (void) updateRowNumber: (int) theindex
{

    rowNumber = theindex + 1;    
}

- (void)dealloc
{

    [super dealloc];
}

- (void)viewDidLoad
{

    UILabel *label1 = [[UILabel alloc]initWithFrame:CGRectMake(50.0, 20.0, 200.0, 50.0)];

    label1.text = [NSString stringWithFormat:@"row %i was clicked ", rowNumber];

    [self.view addSubview: label1];

    [super viewDidLoad];
    [label1 release];
    // Do any additional setup after loading the view from its nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Do any additional setup after loading the view from its nib.
}

- (void)viewWillAppear:(BOOL)animated
{   
    [super viewWillAppear: animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear: animated];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Answer 1

首先，如果“dvController”是属性更改，则“dvController”方法中的“didSelectRowAtIndexPath”引用为“self.dvController”。

其次，在你的“DetailViewController”对象中，当“updateRowNumber”方法触发时...它看起来不像你做任何其他事情（即更新视图或其他）之后，除了更新内部行号。

Answer 2

我根据Michael Dautermann的建议添加以下代码并且它可以正常工作

- (void) updateRowNumber: (int) theindex
{

    rowNumber = theindex + 1;

    UILabel *label1 = [[UILabel alloc]initWithFrame:CGRectMake(50.0, 20.0, 200.0, 50.0)];

    label1.text = [NSString stringWithFormat:@"row %i was clicked ", rowNumber];
    [self.view addSubview: label1];
    [label1 release];

}

didSelectRowAtIndexPath只被调用一次

2 个答案: