Question

我正在尝试创建一个视图控制器，其中包含一个表视图，其中包含可自定义的UITableViewCells。现在，当我创建视图控制器并通过调用[self.navigationController pushController:animated:]推送它时，它显示得很好，当我按下导航控制器的“返回”按钮时，我可以将其弹出。当我第二次创建它时，它显示良好。但是当我第二次点击它时，我的应用程序崩溃了下面的堆栈框架：

#0  0x01087a67 in objc_msgSend
#1  0x04b6afb0 in ??
#2  0x00f1edb5 in +[__NSArrayI __new::]
#3  0x00f21661 in -[NSArray initWithArray:range:copyItems:]
#4  0x00e89833 in -[NSArray initWithArray:copyItems:]
#5  0x00f1ac9d in -[__NSArrayM copyWithZone:]
#6  0x00e867ca in -[NSObject(NSObject) copy]
#7  0x0038a643 in -[UINavigationController viewControllers]
#8  0x0038b68c in -[UINavigationController _shouldBottomBarBeHidden]
#9  0x0038d6b7 in -[UINavigationController _hideOrShowBottomBarIfNeededWithTransition:]
#10 0x00388277 in -[UINavigationController _popViewControllerWithTransition:allowPoppingLast:]
#11 0x0038841e in -[UINavigationController popViewControllerAnimated:]
#12 0x00387856 in -[UINavigationController navigationBar:shouldPopItem:]
#13 0x0032a104 in -[UINavigationBar _popNavigationItemWithTransition:]
#14 0x00332751 in -[UINavigationBar _handleMouseUpAtPoint:]
#15 0x002f60d1 in -[UIWindow _sendTouchesForEvent:]
#16 0x002d737a in -[UIApplication sendEvent:]
#17 0x002dc732 in _UIApplicationHandleEvent
#18 0x0185ba36 in PurpleEventCallback
#19 0x00f07064 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__
#20 0x00e676f7 in __CFRunLoopDoSource1
#21 0x00e64983 in __CFRunLoopRun
#22 0x00e64240 in CFRunLoopRunSpecific
#23 0x00e64161 in CFRunLoopRunInMode
#24 0x0185a268 in GSEventRunModal
#25 0x0185a32d in GSEventRun
#26 0x002e042e in UIApplicationMain
#27 0x0000215e in main at main.m:25

StringEditorViewController的实现代码：

接口

#import <UIKit/UIKit.h>

#pragma mark -
#pragma mark String Editor Delegate
@class StringEditorViewController;
@protocol StringEditorDelegate
- (void)stringEditorWillEndEditing:(StringEditorViewController *)c;
- (void)stringEditorDidEndEditing:(StringEditorViewController *)c;
@end


#pragma mark -
#pragma mark Public Interface
@interface StringEditorViewController : UIViewController
    <UITableViewDelegate,
    UITableViewDataSource> {
    UITableView *mainTableView;

    id <StringEditorDelegate> _delegate;
    NSMutableArray *_strings;
}
#pragma mark Init
- (id)initWithStrings:(NSArray *)str delegate:(id <StringEditorDelegate>)del;

#pragma mark Properties
@property (nonatomic, retain) UITableView *mainTableView;

@property (nonatomic, assign) id <StringEditorDelegate> delegate;
- (void)setStrings:(NSArray *)ns;
- (NSArray *)strings;
@end

Implemnetation

#pragma mark -
#pragma mark Private Interface
@interface StringEditorViewController (PrivateMethods)
- (UIView *)createEditorViewWithTableView:(UITableView **)tv;
@end

#pragma mark -
#pragma mark Public Implementation
@implementation StringEditorViewController
#pragma mark Init and Dealloc
- (id)initWithStrings:(NSArray *)str delegate:(id <StringEditorDelegate>)del {
    self = [super init];
    if(self != nil) {
        UITableView *tv;
        UIView *newView = [self createEditorViewWithTableView:&tv];
        self.mainTableView = tv;
        self.view = newView;
        //[newView release];

        [self setDelegate:del];
        [self setStrings:str];
    }
    return self;
}

- (void)dealloc {
    [mainTableView release];
    [_strings release];

    [super dealloc];
}

#pragma mark Properties
@synthesize mainTableView;
@synthesize delegate=_delegate;
- (void)setStrings:(NSArray *)ns {
    if(ns = nil) {
        ns = [NSArray array];
    }

    if(_strings != ns) {
        [_strings release];
        _strings = [ns mutableCopy];
    }
}

- (NSArray *)strings {
    return [[_strings copy] autorelease];
}

#pragma mark Table View Data Source
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    return nil;
}

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

#pragma mark Private Methods
- (UIView *)createEditorViewWithTableView:(UITableView **)tv {
    UIView *myView;
    UITableView *myTableView;
    CGRect viewFrame;

    viewFrame = [[UIScreen mainScreen] applicationFrame];
    myView = [[UIView alloc] initWithFrame:viewFrame];
    myTableView = [[UITableView alloc] initWithFrame:viewFrame];

    [myView addSubview:myTableView];
    [myTableView setDelegate:self];
    [myTableView setDataSource:self];
    [myTableView autorelease];

    if(tv) {
        *tv = myTableView;
    }

    return myView;
}
@end

我知道我没有通知我的代表该视图将会或确实消失，而且我没有填写UITableView，但现在没有必要实现它。

如果有人可以帮助我，我会非常高兴。先感谢您， ief2

Answer 1

在显示视图控制器时没有找到错误，但在我的视图控制器的-viewWillAppear:和-viewWillDisappear:方法的实现中显示了视图控制器。在该视图控制器中，我通知委托，该委托确实释放了视图控制器。因此，当视图控制器弹出两次时，一次视图第一次消失，一次视图第二次消失时，视图控制器被取消分配，因为它的委托释放了两次。当导航控制器试图访问刚刚解除分配的视图控制器时，程序当然会崩溃。

弹出时UIViewController EXC_BAD_ACCES问题

1 个答案: