Question

我正在创建一个iPad应用。在其中，我有一个UITabBarController设置，显示3个视图。查看1，视图2和视图3.这一切都很好。在视图1上，用户正在创建订单。然后他们会触摸一个构建订单的按钮。这在模式视图中显示，允许用户在实际发送之前查看它。他们可以“提交”或“编辑”订单，无论哪种方式，我解雇模式并返回到视图1.这也很好。但是如果用户再次触摸“make”命令按钮，则此时加载模态视图会导致崩溃“EXC_BAD_ACCESS”。我复制的代码与我在应用程序中为另一个模态视图所做的一样，没有问题一次又一次显示自己。我在这一点上非常困惑，并感谢任何帮助。谢谢。调用模态的代码是：

 -(IBAction) makeOrder {

    NSMutableArray *orderItems = [[NSMutableArray alloc] init];
    //code that populates orderItems array - removed for brevity

    NSLog(@"order items count:%d", [orderItems count]);

    // Create the modal view controller
    PartsOrderViewController *modalController = [[PartsOrderViewController alloc] initWithNibName:@"PartsOrderView" bundle:nil];

    //this is the only difference b/w this and the other modal view.  The other
    //modal presents as a formsheet
    modalController.modalPresentationStyle = UIModalPresentationFullScreen;
    modalController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

    modalController.orderList = orderItems;
    modalController.storeId = selectedCustomer.storeID;
    modalController.customerInfo = customerInfo.text;
    modalController.customerTamsId = selectedCustomer.customerTAMSID;


    // show the Controller modally -- This is the line that cause the error after the second time
    [self presentModalViewController:modalController animated:YES];

    // Clean up resources
    [modalController release]; 
}

它实际上进入了模态的viewDidLoad，但是一旦完成运行就会崩溃。

以下是模态的代码：

#import "PartsOrderViewController.h"


@implementation PartsOrderViewController

@synthesize customerTamsId;
@synthesize customerInfo;
@synthesize invoiceDate;
@synthesize invoiceTime;
@synthesize storeId;

@synthesize customerInfoLabel;
@synthesize invoiceDateLabel;
@synthesize invoiceTimeLabel;
@synthesize storeIdLabel;

@synthesize orderList;

@synthesize delegate;

#pragma mark -
#pragma mark View methods

-(IBAction) editOrder {
    [self dismissModalViewControllerAnimated:YES];
}

-(IBAction) submitOrder {
    //code removed for brevity  
}


#pragma mark -
#pragma mark View implementation methods

 // The designated initializer.  Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization.
    }
    return self;
}
*/


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

    self.customerInfoLabel.text = self.customerInfo;
    self.storeIdLabel.text = self.storeId;
    self.invoiceDateLabel.text = self.invoiceDate;
    self.invoiceTimeLabel.text = self.invoiceTime;

}



- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Overriden to allow any orientation.
    return NO;
}


- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc. that aren't in use.
}


- (void)viewDidUnload {
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


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


@end

更新：找到解决方案：违规代码标记为 -

-(NSMutableArray *)buildOrderList {

        NSMutableArray *orderItems = [[NSMutableArray alloc] init];
        id cellObject = NULL;
        int counter = 0;
        NSEnumerator *theEnum = [self.partsList objectEnumerator];
        while((cellObject = [theEnum nextObject]) != NULL)
        {
            GridTableCell *cell = (GridTableCell *)[self.partsListGrid cellForRowAtIndexPath:[NSIndexPath indexPathForRow:counter inSection:0]];
            UILabel *lineAbbrev = (UILabel *)[cell.contentView.subviews objectAtIndex:0];
            UILabel *partNo = (UILabel *)[cell.contentView.subviews objectAtIndex:1];
            UITextView *orderQty = (UITextView *)[cell.contentView.subviews objectAtIndex:3];
            //NSLog(@"OrderQty length: %d", [orderQty.text length]);
            //NSLog(@"Part#:%@, OrderQty:%@", partNo.text, orderQty.text);

            PartOrderIn *invItem = [[PartOrderIn alloc] init];
            invItem.lineAbbrev = lineAbbrev.text;
            invItem.partNumber = partNo.text;
            invItem.orderQty = orderQty.text;
            invItem.partMessage = @"";

            if ([invItem.orderQty length] > 0) {
                [orderItems addObject:invItem];
            }


            counter++;
            [invItem release];

//The following three lines is what was killing it
            //[lineAbbrev release];
            //[partNo release];
            //[orderQty release];

        } 

        //NSLog(@"order items count:%d", [orderItems count]);
        return orderItems;
}

Answer 1

冒着陈述明显的风险（抱歉;）你是通过调试器进行的吗？糟糕的访问可能是一个内存分配问题（再次，显而易见）。如何定义属性（orderList是否保留？其他属性？）。检查崩溃的位置，并在调试器中使用表达式或通过内存地址记下属性的值。我的猜测是你保留的东西没有被保留。

Answer 2

没有立即跳出来（问题很可能出在简短的代码中），但是你试图启用僵尸吗？ How to enable zombies.这通常会给你一些关于罪犯的迹象，或者至少会给你一些关于在哪里看的内容......

调用presentModalViewController导致“EXC_BAD_ACCESS”

2 个答案: