iOS 5 自定义标签栏取消分配 TableView ？

Question

按照 Scott Sherwood 的教程 (http://www.scott-sherwood.com/ios-5-creating-a-custom-side-tabbar-using-storyboards-and-custom-segues/)，我创建了一个自定义选项卡栏，它使用 subview 加载到其他 View 中。一切都很顺利，我对结果非常满意。但是，当我将表格 View 添加到“标签页”之一并将其连接到数据源时，应用程序崩溃了。

我正在使用 ARC 并打开了僵尸，所以我的控制台告诉我一条消息已发送到我的 TableView 的已释放实例。我不知道如何保留表格 View ，以便显示我的数据。这只是我的第二个应用程序，我对 Storyboard和高级 View Controller 还不太熟悉。我错过了什么？

这是我的自定义选项卡 View Controller :

CustomTabBarViewController.h

@interface CustomTabBarViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>{

}

@property(weak,nonatomic)UIViewController *currentViewController;
@property(weak,nonatomic)IBOutlet UIView *placeholder;
@property (weak, nonatomic) IBOutlet UIImageView *tabIndicator;
@property (weak, nonatomic) IBOutlet UIImageView *headerBacker1;
@property (weak, nonatomic) IBOutlet UIImageView *headerBacker2;



@end

CustomTabBarViewController.m

#import "CustomTabBarViewController.h"

@interface CustomTabBarViewController ()

@property (weak, nonatomic) IBOutlet UIView *buttons;

@end

@implementation CustomTabBarViewController

@synthesize currentViewController;
@synthesize placeholder;
@synthesize buttons;
@synthesize tabIndicator;
@synthesize headerBacker1;
@synthesize headerBacker2;


- (void)viewDidLoad
{
    [super viewDidLoad];
    [self performSegueWithIdentifier:@"ProductSegue" sender:[self.buttons.subviews objectAtIndex:0]];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)viewDidUnload
{
    [self setTabIndicator:nil];
    [self setHeaderBacker1:nil];
    [self setHeaderBacker2:nil];
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    if([segue.identifier isEqualToString:@"ProductSegue"]
       || [segue.identifier isEqualToString:@"ContactSegue"]
       || [segue.identifier isEqualToString:@"CategoryPage"]){


        if([segue.identifier isEqualToString:@"ContactSegue"]){

            [UIView animateWithDuration:0.25f delay:0.0f options:UIViewAnimationOptionCurveEaseOut animations:^{
                [tabIndicator setCenter:CGPointMake(614, 108)];
                [headerBacker1 setCenter:CGPointMake(1024, 48)];
                [headerBacker2 setCenter:CGPointMake(1024, 789)];
            } completion:nil];

        }else{
            [UIView animateWithDuration:0.25f delay:0.0f options:UIViewAnimationOptionCurveEaseOut animations:^{
                [tabIndicator setCenter:CGPointMake(499, 108)];
                [headerBacker1 setCenter:CGPointMake(341, 48)];
                [headerBacker2 setCenter:CGPointMake(341, 789)];
                } completion:nil];

        }
    }
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return UIInterfaceOrientationIsLandscape(interfaceOrientation);
}

@end

以及加载到选项卡中的页面，其中包含表格 View :
(注*:此页面在storyboard中作为tableview数据源和table view delegate链接)

ProductListViewController.h

#import <UIKit/UIKit.h>

@interface ProductListViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>


@property (strong, nonatomic) NSMutableArray *maTheData;


@end

ProductListViewController.m

#import "ProductListViewController.h"

@interface ProductListViewController ()

@end

@implementation ProductListViewController


@synthesize maTheData;

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


- (void)viewDidLoad
{
    [super viewDidLoad];
    NSLog(@"viewDidLoad");
    if (!maTheData) {
        maTheData = [[NSMutableArray alloc] initWithObjects:@"Comets", @"Asteroids", @"Moons", nil];
    }
}

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


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


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [maTheData count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"categoryTableCell"];
    UILabel *lblName = (UILabel *)[cell viewWithTag:100];
    [lblName setText:[maTheData objectAtIndex:[indexPath row]]];

    return cell;
}


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    /*
     <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     */
}


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    //return UIInterfaceOrientationIsLandscape(interfaceOrientation);
    return interfaceOrientation == UIInterfaceOrientationLandscapeRight;

}

@end

谢谢你的想法。

Answer 1

据我从您提供的链接中可以看出，您要连接的 Controller 应该由 currentViewController 指向。所以，问题在于这个声明:

@property(weak,nonatomic)UIViewController *currentViewController;

这需要强大，而不是弱。 IBOutlets 弱是可以的，因为指向的对象是另一个 View 的 subview ，该 View 持有对它们的强引用。但是， currentViewController 应该很强大，以防止您的 Controller 被释放(没有其他东西对它有很强的引用)。我从链接中看到他在 perform 方法中将 currentViewController 设置为 segue 的目标 Controller ——如果你这样做，并且你将声明更改为 strong，你应该没问题。