使用标签栏在视图之间切换时 iPhone 应用程序崩溃

Question

我有一个 iPhone 应用程序，当我在两个选项卡之间切换 4 或 5 次时，该应用程序会崩溃。其中一个视图有一个 UITableView，可以在您键入时进行搜索，我有一种感觉，这就是出了问题的地方。在界面生成器中，如果我将引用插座的表视图连接到包含搜索结果的数组，则您键入的搜索效果很好，但随后我遇到了视图之间的切换问题。 如果我不建立此连接，搜索将无法正常进行。当我搜索后上下滚动时，它只会刷新表格视图。

有谁知道可能出了什么问题吗？我已经为此苦苦挣扎了好几天，而且我对 iPhone 编程还很陌生。谢谢

编辑： 我在控制台中收到此错误：

2011-07-30 10:52:09.835 ConnectIPhone[7019:207] -[NSCFString setReorderedIndexPath:]:     unrecognized selector sent to instance 0x4e48370
2011-07-30 10:52:09.838 ConnectIPhone[7019:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString setReorderedIndexPath:]:     unrecognized selector sent to instance 0x4e48370'
*** Call stack at first throw:
(
0   CoreFoundation                      0x00dd6be9 __exceptionPreprocess + 185
1   libobjc.A.dylib                     0x00f2b5c2 objc_exception_throw + 47
2   CoreFoundation                      0x00dd86fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3   CoreFoundation                      0x00d48366 ___forwarding___ + 966
4   CoreFoundation                      0x00d47f22 _CF_forwarding_prep_0 + 50
5   UIKit                               0x00359171 -[UITableView reloadData] + 446
6   ConnectIPhone                       0x0000649e -[PeopleViewController viewWillAppear:] + 460
7   UIKit                               0x003a02bf -[UITabBarController transitionFromViewController:toViewController:transition:shouldSetSelected:] + 263
8   UIKit                               0x0039ed86 -[UITabBarController transitionFromViewController:toViewController:] + 64
9   UIKit                               0x003a0b7e -[UITabBarController _setSelectedViewController:] + 263
10  UIKit                               0x003a09ed -[UITabBarController _tabBarItemClicked:] + 352
11  UIKit                               0x002dfa6e -[UIApplication sendAction:to:from:forEvent:] + 119
12  UIKit                               0x004dd1f2 -[UITabBar _sendAction:withEvent:] + 422
13  UIKit                               0x002dfa6e -[UIApplication sendAction:to:from:forEvent:] + 119
14  UIKit                               0x0036e1b5 -[UIControl sendAction:to:forEvent:] + 67
15  UIKit                               0x00370647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
16  UIKit                               0x0036e16c -[UIControl sendActionsForControlEvents:] + 49
17  UIKit                               0x002dfa6e -[UIApplication sendAction:to:from:forEvent:] + 119
18  UIKit                               0x0036e1b5 -[UIControl sendAction:to:forEvent:] + 67
19  UIKit                               0x00370647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
20  UIKit                               0x0036f1f4 -[UIControl touchesEnded:withEvent:] + 458
21  UIKit                               0x003040d1 -[UIWindow _sendTouchesForEvent:] + 567
22  UIKit                               0x002e537a -[UIApplication sendEvent:] + 447
23  UIKit                               0x002ea732 _UIApplicationHandleEvent + 7576
24  GraphicsServices                    0x0170ca36 PurpleEventCallback + 1550
25  CoreFoundation                      0x00db8064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
26  CoreFoundation                      0x00d186f7 __CFRunLoopDoSource1 + 215
27  CoreFoundation                      0x00d15983 __CFRunLoopRun + 979
28  CoreFoundation                      0x00d15240 CFRunLoopRunSpecific + 208
29  CoreFoundation                      0x00d15161 CFRunLoopRunInMode + 97
30  GraphicsServices                    0x0170b268 GSEventRunModal + 217
31  GraphicsServices                    0x0170b32d GSEventRun + 115
32  UIKit                               0x002ee42e UIApplicationMain + 1160
33  ConnectIPhone                       0x00001ca0 main + 102
34  ConnectIPhone                       0x00001c31 start + 53
35  ???                                 0x00000001 0x0 + 1
)
terminate called after throwing an instance of 'NSException'

cellForRowAtIndexPath 代码：

-(UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:    (NSIndexPath*)indexPath
{

static NSString *cellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil){
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier] autorelease];
}
row = [indexPath row];
if (row >= [listData count]){
    cell.textLabel.text = @"";
}else {
    NSMutableString *cellText = [[NSMutableString alloc] initWithString:[[listData objectAtIndex:row] objectAtIndex:0]];
    [cellText appendString:@", "];
    [cellText appendString:[[listData objectAtIndex:row] objectAtIndex:1]];
    cell.textLabel.textColor = [UIColor whiteColor];
    cell.textLabel.text = cellText;
    [cellText release];
}
return cell;
}

类：

#import "PeopleViewController.h"

@implementation PeopleViewController
// 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;
}
*/

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

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
self.editing = YES;
cHandle = [ConnectHandler new];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
userID = [defaults objectForKey:kUserID];
password = [defaults objectForKey:kPassword];

NSString *response = [cHandle doSearch:@"" :userID :[cHandle hashPass:password]];
listData = (NSMutableArray*)[cHandle parseSearch:response];
self.view.autoresizesSubviews = YES;
self.view.autoresizingMask = UIViewAutoresizingFlexibleWidth |     UIViewAutoresizingFlexibleHeight;

[listTable reloadData];

[super viewDidLoad];
}

-(void)viewWillAppear:(BOOL)animated
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

userID = [defaults objectForKey:kUserID];
password = [defaults objectForKey:kPassword];

//initiate the connection handler, get the json response
cHandle = [ConnectHandler new];
NSString *response = [cHandle doSearch:@"": userID :[cHandle hashPass:password]];
listData = (NSMutableArray*)[cHandle parseSearch:response];
//[listTable reloadData];
[response release];
[super viewWillAppear:animated];
}

-(void)viewWillDisappear:(BOOL)animated{
[listData release];
[listTable release];

[super viewWillDisappear:animated];
}

// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return YES;
}


- (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;
}


#pragma mark -
#pragma mark Search View
-(void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{
listData = nil;
[listTable reloadData];
query = searchBar.text;
[searchBar resignFirstResponder];

[listData removeAllObjects];
}

-(void)searchBarCancelButtonClicked:(UISearchBar *)searchBar {
searchBar.text = @"";
[listTable reloadData];
[searchBar resignFirstResponder];
query = searchBar.text;

[listData removeAllObjects];
[self loadSearch:query];
}

-(void)searchBar:(UISearchBar*)searchBar textDidChange:(NSString*)searchText {
listData = nil;
[listTable reloadData];
query = searchBar.text;
[listData removeAllObjects];
[self loadSearch:query];
}

-(void)searchBarTextDidEndEditing:(UISearchBar *)searchBar
{
[listTable reloadData];
}

-(void)loadSearch:(NSString *)q{
self.editing = YES;
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

userID = [defaults objectForKey:kUserID];
password = [defaults objectForKey:kPassword];

NSString *response = [cHandle doSearch:q :userID :[cHandle hashPass:password]];
listData = (NSMutableArray*)[cHandle parseSearch:response];
[listTable reloadData];
for (UITableViewCell *cell in [listTable visibleCells]) {
    NSIndexPath *cellIndexPath = [listTable indexPathForCell:cell];

    [listTable cellForRowAtIndexPath:cellIndexPath];
}
[response release];
}

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

#pragma mark -
#pragma mark Table View Data Source Methods
-(NSInteger)numberOfSectionsInTableView:(UITableView*)tableView 
{
return 1;
}

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

-(UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{

static NSString *cellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil){
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier] autorelease];
}
row = [indexPath row];
if (row >= [listData count]){
    cell.textLabel.text = @"";
}else {
    NSMutableString *cellText = [[NSMutableString alloc] initWithString:[[listData objectAtIndex:row] objectAtIndex:0]];
    [cellText appendString:@", "];
    [cellText appendString:[[listData objectAtIndex:row] objectAtIndex:1]];
    cell.textLabel.textColor = [UIColor whiteColor];
    cell.textLabel.text = cellText;
    [cellText release];
}
return cell;
}


-(UITableViewCellEditingStyle)tableView:(UITableView*)tableView editingStyleForRowAtIndexPath:(NSIndexPath*)indexPath
{
if (self.editing && indexPath.row == ([listData count]))
    return UITableViewCellEditingStyleInsert;
else {
    return UITableViewCellEditingStyleDelete;
}
}


-(void)tableView:(UITableView*)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath*)indexPath {
[listTable beginUpdates];
if (editingStyle == UITableViewCellEditingStyleDelete)
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    [cell setUserInteractionEnabled:NO];
    cell.selected = NO;
    [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
} else {

}
[listTable endUpdates];
}

-(BOOL)tableView:(UITableView*)tableView canMoveRowAtIndexPath:(NSIndexPath*)indexPath
{
return YES;
}


@end

Answer 1

在您的代码中，似乎在字符串上调用了一个方法，而不是其他方法。尝试调试您的应用程序，在 cellForRowAtIndexPath 中放置一个断点。

Answer 2

首先，引用插座的 uitableview 不应连接到数组，您必须将其连接到 uitableview。接下来，表视图的日期源和委托也应该设置为实现它们的类。

在 viewDidLoad 上，您必须在 uitableview 上调用 reloadData。这样，表格视图将在需要滚动之前更新。另外粘贴一些代码，以便调试其他问题。