調用presentModalViewController會導致“ EXC_BAD_ACCESS”

Question

我正在創建一個iPad應用程序。 在其中，我設置了一個UITabBarController來顯示3個視圖。 查看1，查看2和查看3。這一切都很好。 在視圖1上，用戶正在創建訂單。 然后，他們觸摸建立訂單的按鈕。 這在模式視圖中顯示，允許用戶在實際發送之前對其進行查看。 他們可以“提交”或“編輯”訂單，無論哪種方式，我都關閉了模態並返回到視圖1。這也很好。 但是，如果用戶再次觸摸“ make”命令按鈕，則這次加載模式視圖會導致崩潰“ EXC_BAD_ACCESS”。 我復制了代碼，就像在應用程序中另一個模式視圖一樣復制了代碼，這一次又一次地顯示自己沒有問題。 我現在很困惑，不勝感激。 謝謝。 調用模式的代碼是：

 -(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]; 
}

它實際上進入模態的viewDidLoad中，但是一旦運行完畢便崩潰。

這是模態的代碼：

#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：找到解決方案：令人反感的代碼被標記為-

-(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

冒着陳述明顯的（抱歉；）的風險，您是否已通過調試器逐步執行此操作？ 錯誤的訪問可能是內存分配問題（再次，很明顯，先生）。 如何定義屬性（是否保留orderList？其他屬性？）。 使用調試器中的表達式或按內存地址檢查崩潰的位置並記下屬性值。 我的猜測是您假設保留了某些未保留的東西。

Answer 2

沒有什么立即跳出來的（問題很可能是為簡潔起見而刪除的代碼），但是您是否嘗試啟用僵屍程序？ 如何啟用僵屍。 這通常會給您一些有關犯罪者的提示，或者至少會給您一些提示。