Iphone 返回tableview后崩溃
因此，我正在编写一个应用程序来读取rss提要，并在tableview中显示内容。它还允许用户播放为每个项目找到的MP3。无论如何，在我开始添加新视图之前，应用程序似乎运行良好。现在，每次我从一个视图返回并滚动一点，我都会得到“程序接收信号”SIGABRT“或类似的东西 以下是节目的大部分内容：Iphone 返回tableview后崩溃,iphone,objective-c,ios,uitableview,memory-management,Iphone,Objective C,Ios,Uitableview,Memory Management,因此，我正在编写一个应用程序来读取rss提要，并在tableview中显示内容。它还允许用户播放为每个项目找到的MP3。无论如何，在我开始添加新视图之前，应用程序似乎运行良好。现在，每次我从一个视图返回并滚动一点，我都会得到“程序接收信号”SIGABRT“或类似的东西 以下是节目的大部分内容： - (IBAction)playAction:(id)sender { // Get row UIButton *senderButton = (UIButton *)sender; UITableVie
- (IBAction)playAction:(id)sender
{
// Get row
UIButton *senderButton = (UIButton *)sender;
UITableViewCell *buttonCell =
(UITableViewCell *) [[senderButton superview] superview];
NSInteger buttonRow = [[self.tableView
indexPathForCell:buttonCell] row];
// Entry for row
RSSEntry *senderEntry = [_allEntries objectAtIndex:buttonRow];
// This is where _allEntries gets filled
- (void)requestFinished:(ASIHTTPRequest *)request {
[_queue addOperationWithBlock:^{
NSError *error;
GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:[request responseData]
options:0 error:&error];
if (doc == nil)
{
NSLog(@"Failed to parse %@", request.url);
}
else
{
NSMutableArray *entries = [NSMutableArray array];
[self parseRss:doc.rootElement entries:entries];
if ([_allEntries count] > 0) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
// Update
int i=0;
while (![[[_allEntries objectAtIndex:i] articleUrl] isEqualToString:[[entries objectAtIndex:i] articleUrl]])
{
[_allEntries insertObject:[entries objectAtIndex:i] atIndex:0];
i++;
}
[self.tableView reloadData];
}];
}
else
{
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
for (RSSEntry *entry in entries)
{
[_allEntries addObject:entry];
}
NSLog(@"entries:%d", [_allEntries count]);
[self.tableView reloadData];
}];
}
}
}];
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(@"View did load");
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh
target:self
action:@selector(refreshButton:)];
pauseImage = [UIImage imageNamed:@"pause_circle_small.png"];
playImage = [UIImage imageNamed:@"play_circle_small.png"];
player = nil;
isPlaying = NO;
self.title = @"Feed";
self.allEntries = [NSMutableArray array];
self.queue = [[[NSOperationQueue alloc] init] autorelease];
self.feed = [[NSString alloc] initWithString:@"http://site.org/rss/"];
[self refresh];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [_allEntries count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UILabel *mainLabel, *secondLabel;
UIButton *playBtn;
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier] autorelease];
mainLabel = [[[UILabel alloc] initWithFrame:CGRectMake(42.0, 5.0, 250.0, 20.0)] autorelease];
mainLabel.tag = MAINLABEL_TAG;
mainLabel.font = [UIFont fontWithName:@"Arial-BoldMT" size:18.0];
mainLabel.textAlignment = UITextAlignmentLeft;
mainLabel.textColor = [UIColor blackColor];
mainLabel.highlightedTextColor = [UIColor whiteColor];
[cell.contentView addSubview:mainLabel];
secondLabel = [[[UILabel alloc] initWithFrame:CGRectMake(42.0, 27.0, 250.0, 15.0)] autorelease];
secondLabel.tag = SECONDLABEL_TAG;
secondLabel.font = [UIFont fontWithName:@"ArialMT" size:14.0];
secondLabel.textAlignment = UITextAlignmentLeft;
secondLabel.textColor = [UIColor colorWithRed:222.0/255.0 green:95.0/255.0
blue:199.0/255.0 alpha:1.0];
secondLabel.highlightedTextColor = [UIColor whiteColor];
[cell.contentView addSubview:secondLabel];
playBtn = [UIButton buttonWithType:UIButtonTypeCustom];
playBtn.tag = PLAYBTN_TAG;
playBtn.frame = CGRectMake(2.0, 6.0, playImage.size.width, playImage.size.height);
[playBtn setBackgroundImage:playImage forState:UIControlStateNormal];
//[playBtn setBackgroundImage:playImage forState:UIControlStateHighlighted];
[playBtn addTarget:self action:@selector(playTapped:)
forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:playBtn];
}
else
{
mainLabel = (UILabel *)[cell.contentView viewWithTag:MAINLABEL_TAG];
secondLabel = (UILabel *)[cell.contentView viewWithTag:SECONDLABEL_TAG];
playBtn = (UIButton *)[cell.contentView viewWithTag:PLAYBTN_TAG];
}
// Alternate bg color
if (indexPath.row%2 == 0) {
UIColor *altColor = [UIColor colorWithRed:230.0/255.0 green:230.0/255.0
blue:230.0/255.0 alpha:1];
mainLabel.backgroundColor = altColor;
secondLabel.backgroundColor = altColor;
}
else
{
UIColor *altColor = [UIColor colorWithRed:255.0 green:255.0
blue:255.0 alpha:1];
mainLabel.backgroundColor = altColor;
secondLabel.backgroundColor = altColor;
}
RSSEntry *entry = [_allEntries objectAtIndex:indexPath.row];
NSLog(@"Entry: %@", entry);
// Manage play button
if (entry == currEntry)
{
if(isPlaying)
{
[playBtn setBackgroundImage:pauseImage forState:UIControlStateNormal];
}
else
{
[playBtn setBackgroundImage:playImage forState:UIControlStateNormal];
}
}
else
[playBtn setBackgroundImage:playImage forState:UIControlStateNormal];
mainLabel.text = entry.articleTitle;
secondLabel.text = entry.articleArtist;
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
DetailView *detailViewController = [[DetailView alloc] initWithNibName:@"DetailedView" bundle:[NSBundle mainBundle]];
RSSEntry *entry = [_allEntries objectAtIndex:[indexPath row]];
[self.navigationController pushViewController:detailViewController animated:YES];
detailViewController.songTitle.text = entry.articleTitle;
detailViewController.artistName.text = entry.articleArtist;
[entry release];
[detailViewController release];
}
- (void)dealloc
{
[player release];
player = nil;
[_queue release];
_queue = nil;
[_feed release];
_feed = nil;
[_allEntries release];
_allEntries = nil;
[super dealloc];
}
@end
如果没有线路，你会在哪里崩溃，这很难说，但很可能你访问了某个对象，什么是解除锁定的 很可能是这里
self.feed = [[NSString alloc] initWithString:@"http://site.org/rss/music"];
[self.feed release];
您可以立即释放对象，但如果不知道您是否保留了属性，就很难说出来。请不要释放任何@synthesis变量。您应该只使用dealloc方法发布它，这是一种猜测，但您不会保留在
viewDidLoadpauseImage = [UIImage imageNamed:@"pause_circle_small.png"];
playImage = [UIImage imageNamed:@"play_circle_small.png"];
使用retaining属性和点语法或发送每个a
retain这是最主要的检查，在这之后，我想你不要取消tableview的代理。AHAA！！！我把我的RSSEntry设置为自动释放，然后再将它们放入allEntries数组。当我改变观点时，他们正在被解雇。不要那样做。谢谢大家的帮助。那太简单了，我现在觉得自己很笨 不要在
视图didload:delloc[self.feed release]。我不能肯定它能解决你的问题因此，当它在mainlab.text=entry.articletTitle
上崩溃时，它实际上指向了一个错误的地址。我只是不知道我的RSSEntry对象是如何改变的。你确定坏地址在条目上吗不是mainLabel
？根据@Eiko的回答，我发现你的pauseImage
&playImage
是iVar！它们将在退出该方法时自动释放，只需遵循@Eiko的建议即可@是的，我修好了。由于某种原因，我的articletTitle
或articleArtist
崩溃时为零。它们根本不应该改变。有时它会在“mainlab.text=entry.articletTitle”行崩溃；但是很难看到RSSEntry会被解除锁定，当视图切换时，我不会解除任何锁定。无论如何，我不这么认为……这不是一个好的模式，但如果feed是一个“保留”属性，那么在这里很可能还可以。（我们不知道，但应该期待）啊，我没有在那里使用保留，所以是的，我修复了它。仍在崩溃。如果它在mainLabel.text=。。。行，在该行之前设置一个断点，并检查标签和条目。您的意思是在-dealoc方法中，我应该释放委托？我不知道。但是dealloc直到程序的最后才被调用。很好的调用，但是我修复了它，它仍然是相同的情况。每当我离开tableview并返回时，它就会崩溃。我确信您释放了一些不应该释放的变量。尝试对所有变量使用NSAutoreleasePool。