我正在尝试构建应用程序的RSS提要部分，但每当我对数据库进行更改时，它似乎都会崩溃。 我所拥有的是一些rss feed的列表，在naviagtionbar中有一个编辑按钮，单击编辑会转到一个页面，该页面允许选择使用开关在第一页上显示哪些RSS源。 这些开关只是更改db
中的整数值第一页
#import "NewsViewController.h"
#import "NewsAddViewController.h"
@implementation NewsViewController
@synthesize feedIDs, rssDB;
#pragma mark -
#pragma mark View lifecycle
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(editFeeds:)];
}
- (void) editFeeds: (id) sender{
NSLog(@"Editting Feeds");
NewsAddViewController *newsAddViewController = [[NewsAddViewController alloc]initWithStyle:UITableViewStylePlain];
newsAddViewController.rssDB = rssDB;
[self.navigationController pushViewController:newsAddViewController animated:YES];
newsAddViewController.title=@"Subscriptions";
[newsAddViewController release];
}
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self loadFeedIDs];
[self.tableView reloadData];
}
#pragma mark -
#pragma mark Table view data source
// Customize the number of sections in the table view.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
[self loadFeedIDs];
return [feedIDs count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell.
NSDictionary * feedRow = [rssDB getFeedRow:[feedIDs objectAtIndex:indexPath.row]];
[cell.textLabel setText:[feedRow objectForKey:@"title"]];
[cell.detailTextLabel setText:[feedRow objectForKey:@"desc"]];
return cell;
}
#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[self loadFeedIDsIfEmpty];
// clean up aged feed items from the database
[rssDB deleteOldItems:[feedIDs objectAtIndex:indexPath.row]];
// create the item view controller
NewsItemViewController *itemViewController = [[NewsItemViewController alloc] initWithStyle:UITableViewStylePlain];
itemViewController.rssDB = rssDB;
itemViewController.feedID = [feedIDs objectAtIndex:indexPath.row];
[self.navigationController pushViewController:itemViewController animated:YES];
[itemViewController release];
}
/*
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
forRowAtIndexPath:(NSIndexPath *)indexPath {
[self loadFeedIDsIfEmpty];
if (editingStyle == UITableViewCellEditingStyleDelete) {
// must update the database before updating the tableView
// so that the tableView never has a row that's missing from the database
[rssDB deleteFeedRow:[feedIDs objectAtIndex:indexPath.row]];
[self loadFeedIDs];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
}
*/
#pragma mark -
#pragma mark Memory management
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
// For example: self.myOutlet = nil;
}
- (void)dealloc {
// NSLog(@"%s", __FUNCTION__);
[super dealloc];
if (feedIDs) [feedIDs release];
if (rssDB) [rssDB release];
}
#pragma mark -
#pragma mark Database methods
- (NSArray *) loadFeedIDs {
// NSLog(@"%s", __FUNCTION__);
if (!rssDB) [self loadFeedDB];
feedIDs = [rssDB getFeedIDs];
return feedIDs;
}
- (NSArray *) loadFeedIDsIfEmpty {
// NSLog(@"%s", __FUNCTION__);
if (!rssDB) [self loadFeedDB];
if (!feedIDs || ![feedIDs count]) feedIDs = [rssDB getFeedIDs];
return feedIDs;
}
- (RSSDB *) loadFeedDB {
// NSLog(@"%s", __FUNCTION__);
if (!rssDB) self.rssDB = [[RSSDB alloc] initWithRSSDBFilename:@"bwrss.db"];
return rssDB;
}
@end
第二页
//
// NewsAddViewController.m
// myUCL
//
// Created by Lion User on 21/08/2011.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import "NewsAddViewController.h"
@implementation NewsAddViewController
@synthesize feedIDs, rssDB;
#pragma mark - View lifecycle
-(void)viewDidLoad {
[super viewDidLoad];
[self loadFeedIDs];
[self.tableView reloadData];
}
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
}
#pragma mark -
#pragma mark Table view data source
// Customize the number of sections in the table view.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
[self loadFeedIDs];
return [feedIDs count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:@"SwitchCell"] autorelease];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
UISwitch *switchView = [[UISwitch alloc] initWithFrame:CGRectZero];
cell.accessoryView = switchView;
NSDictionary * feedRow = [rssDB getFeedRow:[feedIDs objectAtIndex:indexPath.row]];
BOOL status = [[feedRow objectForKey:@"show"]boolValue];
NSLog(@"%i",status);
[switchView setOn:status animated:NO];
[switchView addTarget:self action:@selector(switchChanged:) forControlEvents:UIControlEventValueChanged];
[switchView release];
[cell.textLabel setText:[feedRow objectForKey:@"title"]];
}
return cell;
}
- (void) switchChanged:(UISwitch *)sender {
UISwitch* switchControl = sender;
//NSLog( @"The switch is %@", switchControl.on ? @"ON" : @"OFF" );
if (switchControl.on) {
NSLog(@"switch is on");
[rssDB updateStatus:[NSNumber numberWithInt:1] :[NSNumber numberWithInt:1]];
NSLog(@"feed status %@",[rssDB feedStatus:[NSNumber numberWithInt:1]]);
} else if (!switchControl.on) {
NSLog(@"switch is off");
[rssDB updateStatus:[NSNumber numberWithInt:0] :[NSNumber numberWithInt:1]];
NSLog(@"feed status %@",[rssDB feedStatus:[NSNumber numberWithInt:1]]);
}
}
#pragma mark -
#pragma mark Memory management
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
// For example: self.myOutlet = nil;
}
- (void)dealloc {
// NSLog(@"%s", __FUNCTION__);
[super dealloc];
if (feedIDs) [feedIDs release];
if (rssDB) [rssDB release];
}
#pragma mark -
#pragma mark Database methods
- (NSArray *) loadFeedIDs {
// NSLog(@"%s", __FUNCTION__);
if (!rssDB) [self loadFeedDB];
feedIDs = [rssDB getAllFeedIDs];
return feedIDs;
}
- (NSArray *) loadFeedIDsIfEmpty {
// NSLog(@"%s", __FUNCTION__);
if (!rssDB) [self loadFeedDB];
if (!feedIDs || ![feedIDs count]) feedIDs = [rssDB getAllFeedIDs];
return feedIDs;
}
- (RSSDB *) loadFeedDB {
// NSLog(@"%s", __FUNCTION__);
if (!rssDB) self.rssDB = [[RSSDB alloc] initWithRSSDBFilename:@"bwrss.db"];
return rssDB;
}
@end
堆栈跟踪
2011-08-22 14:03:57.392 myUCL[4890:b303] -[UIGestureRecognizerTarget removeAllObjects]: unrecognized selector sent to instance 0x4cd8cf0
2011-08-22 14:03:57.395 myUCL[4890:b303] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIGestureRecognizerTarget removeAllObjects]: unrecognized selector sent to instance 0x4cd8cf0'
*** Call stack at first throw:
(
0 CoreFoundation 0x00e795a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00fcd313 objc_exception_throw + 44
2 CoreFoundation 0x00e7b0bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x00dea966 ___forwarding___ + 966
4 CoreFoundation 0x00dea522 _CF_forwarding_prep_0 + 50
5 myUCL 0x0000749f -[RSSDB getAllFeedIDs] + 79
6 myUCL 0x0000db12 -[NewsAddViewController loadFeedIDs] + 130
7 myUCL 0x0000d1b3 -[NewsAddViewController viewDidLoad] + 99
8 UIKit 0x0017b089 -[UIViewController view] + 179
9 UIKit 0x00179482 -[UIViewController contentScrollView] + 42
10 UIKit 0x00189f25 -[UINavigationController _computeAndApplyScrollContentInsetDeltaForViewController:] + 48
11 UIKit 0x00188555 -[UINavigationController _layoutViewController:] + 43
12 UIKit 0x001897aa -[UINavigationController _startTransition:fromViewController:toViewController:] + 326
13 UIKit 0x0018432a -[UINavigationController _startDeferredTransitionIfNeeded] + 266
14 UIKit 0x0018b562 -[UINavigationController pushViewController:transition:forceImmediate:] + 932
15 UIKit 0x001841c4 -[UINavigationController pushViewController:animated:] + 62
16 myUCL 0x0000321f -[NewsViewController editFeeds:] + 255
17 UIKit 0x000cb4fd -[UIApplication sendAction:to:from:forEvent:] + 119
18 UIKit 0x002ddcc3 -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 156
19 UIKit 0x000cb4fd -[UIApplication sendAction:to:from:forEvent:] + 119
20 UIKit 0x0015b799 -[UIControl sendAction:to:forEvent:] + 67
21 UIKit 0x0015dc2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
22 UIKit 0x0015c7d8 -[UIControl touchesEnded:withEvent:] + 458
23 UIKit 0x000efded -[UIWindow _sendTouchesForEvent:] + 567
24 UIKit 0x000d0c37 -[UIApplication sendEvent:] + 447
25 UIKit 0x000d5f2e _UIApplicationHandleEvent + 7576
26 GraphicsServices 0x0110f992 PurpleEventCallback + 1550
27 CoreFoundation 0x00e5a944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
28 CoreFoundation 0x00dbacf7 __CFRunLoopDoSource1 + 215
29 CoreFoundation 0x00db7f83 __CFRunLoopRun + 979
30 CoreFoundation 0x00db7840 CFRunLoopRunSpecific + 208
31 CoreFoundation 0x00db7761 CFRunLoopRunInMode + 97
32 GraphicsServices 0x0110e1c4 GSEventRunModal + 217
33 GraphicsServices 0x0110e289 GSEventRun + 115
34 UIKit 0x000d9c93 UIApplicationMain + 1160
35 myUCL 0x00001f69 main + 121
36 myUCL 0x00001ee5 start + 53
)
terminate called throwing an exceptionCurrent language: auto; currently objective-c
(gdb)
答案 0 :(得分：2)
我会说你调用 - [NSMutable＆lt; Array，Dictionary，Set＆gt;对于dealoced对象
的removeAllObjects]