我有一个嵌入在 TabView 中的 NSTableView，我在滚动表格时看到一些奇怪的绘图扭曲，如下图所示。奇怪的是，我已经在这个项目上工作了一个多月，而这才刚刚开始。
我已经覆盖了行绘图代码，它也在下面，但几周没有改变。
最近唯一相当重要的变化是将项目更新到 XCode 5.0Dp，因为这个应用程序要等到 iOS7 发布后才会发布，我想确保一切正常（我做了一件好事，因为我有一些代码导致应用程序崩溃随附的 iOS 应用程序）。
非常感谢任何帮助！
- (NSView *)tableView:(NSTableView *)tableView viewForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {
// Get a new ViewCell
NSTableCellView *cellView = [tableView makeViewWithIdentifier:tableColumn.identifier owner:self];
//Identify the correct column
if( [tableColumn.identifier isEqualToString:@"userLogo"] )
{
Tweet* selectedTweet;
if(self.updatingBucket == YES){
NSFetchRequest *request = [[NSFetchRequest alloc] init];
//Set predicate and filter for New tweets page
if ([self.currentTwitterView isEqualToString:@"new"]) {
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"(approved == NO) AND (tweetDeleted == NO) AND (scheduledTweet == NO)"];
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"postDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
[request setPredicate:testForTrue];
[request setSortDescriptors:sortDescriptors];
//Set filter and predicate for the Approved tweets page
} else if ([self.currentTwitterView isEqualToString:@"approved"]){
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"(approved == YES) AND (tweetDeleted == NO) AND (scheduledTweet == NO)"];
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"approvedDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
[request setPredicate:testForTrue];
[request setSortDescriptors:sortDescriptors];
//Set filter and preicate for the Deleted tweets page
} else if ([self.currentTwitterView isEqualToString:@"deleted"]){
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"tweetDeleted == YES"];
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"deletedDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
[request setPredicate:testForTrue];
[request setSortDescriptors:sortDescriptors];
//Set filter and preicate for the Deleted tweets page
} else if ([self.currentTwitterView isEqualToString:@"scheduled"]){
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"scheduledTweet == YES"];
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"scheduledDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
[request setPredicate:testForTrue];
[request setSortDescriptors:sortDescriptors];
}
//Setup the Request
[request setEntity:[NSEntityDescription entityForName:@"Tweet" inManagedObjectContext:_managedObjectContext]];
//Assign the predicate to the fetch request
NSError *error = nil;
//Create an array from the returned objects
NSArray *fetchedObjects = [_managedObjectContext executeFetchRequest:request error:&error];
selectedTweet = [fetchedObjects objectAtIndex:row];
} else {
selectedTweet = [self.onScreenTweets objectAtIndex:row];
}
cellView.imageView.image = nil;
dispatch_async(dispatch_queue_create("getAsynchronIconsGDQueue", NULL),
^{
NSURL *url = [NSURL URLWithString:selectedTweet.avatarUrl];
NSImage *image = [[NSImage alloc] initWithContentsOfURL:url];
cellView.imageView.image = image;
});
//[cellView setWantsLayer:YES];
return cellView;
}
编辑 1
这是表格行的绘图代码：
//Load the image into the table
- (NSView *)tableView:(NSTableView *)tableView viewForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {
// Get a new ViewCell
NSTableCellView *cellView = [tableView makeViewWithIdentifier:tableColumn.identifier owner:self];
if(tableView == self.tweetTableView){
//Identify the correct column
if( [tableColumn.identifier isEqualToString:@"userLogo"] )
{
Tweet* selectedTweet;
if(self.updatingBucket == YES || self.facebookFetching == YES){
NSFetchRequest *request = [[NSFetchRequest alloc] init];
//Set predicate and filter for New tweets page
if ([self.currentTwitterView isEqualToString:@"new"]) {
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"(approved == NO) AND (tweetDeleted == NO) AND (scheduledTweet == NO)"];
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"postDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
[request setPredicate:testForTrue];
[request setSortDescriptors:sortDescriptors];
//Set filter and predicate for the Approved tweets page
} else if ([self.currentTwitterView isEqualToString:@"approved"]){
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"(approved == YES) AND (tweetDeleted == NO) AND (scheduledTweet == NO)"];
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"approvedDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
[request setPredicate:testForTrue];
[request setSortDescriptors:sortDescriptors];
//Set filter and preicate for the Deleted tweets page
} else if ([self.currentTwitterView isEqualToString:@"deleted"]){
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"tweetDeleted == YES"];
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"deletedDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
[request setPredicate:testForTrue];
[request setSortDescriptors:sortDescriptors];
//Set filter and preicate for the Deleted tweets page
} else if ([self.currentTwitterView isEqualToString:@"scheduled"]){
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"scheduledTweet == YES"];
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"scheduledDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
[request setPredicate:testForTrue];
[request setSortDescriptors:sortDescriptors];
}
//Setup the Request
[request setEntity:[NSEntityDescription entityForName:@"Tweet" inManagedObjectContext:_managedObjectContext]];
//Assign the predicate to the fetch request
NSError *error = nil;
//Create an array from the returned objects
NSArray *fetchedObjects = [_managedObjectContext executeFetchRequest:request error:&error];
selectedTweet = [fetchedObjects objectAtIndex:row];
} else {
selectedTweet = [self.onScreenTweets objectAtIndex:row];
}
cellView.imageView.image = nil;
dispatch_async(dispatch_queue_create("getAsynchronIconsGDQueue", NULL),
^{
NSURL *url = [NSURL URLWithString:selectedTweet.avatarUrl];
NSImage *image = [[NSImage alloc] initWithContentsOfURL:url];
cellView.imageView.image = image;
});
//[cellView setWantsLayer:YES];
return cellView;
} if([tableColumn.identifier isEqualToString:@"secondButtons"]){
Tweet* selectedTweet;
if(self.updatingBucket == YES){
NSFetchRequest *request = [[NSFetchRequest alloc] init];
//Set predicate and filter for New tweets page
if ([self.currentTwitterView isEqualToString:@"new"]) {
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"(approved == NO) AND (tweetDeleted == NO) AND (scheduledTweet == NO)"];
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"postDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
[request setPredicate:testForTrue];
[request setSortDescriptors:sortDescriptors];
//Set filter and predicate for the Approved tweets page
} else if ([self.currentTwitterView isEqualToString:@"approved"]){
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"(approved == YES) AND (tweetDeleted == NO) AND (scheduledTweet == NO)"];
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"approvedDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
[request setPredicate:testForTrue];
[request setSortDescriptors:sortDescriptors];
//Set filter and preicate for the Deleted tweets page
} else if ([self.currentTwitterView isEqualToString:@"deleted"]){
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"tweetDeleted == YES"];
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"deletedDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
[request setPredicate:testForTrue];
[request setSortDescriptors:sortDescriptors];
//Set filter and preicate for the Deleted tweets page
} else if ([self.currentTwitterView isEqualToString:@"scheduled"]){
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"scheduledTweet == YES"];
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"scheduledDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
[request setPredicate:testForTrue];
[request setSortDescriptors:sortDescriptors];
}
//Setup the Request
[request setEntity:[NSEntityDescription entityForName:@"Tweet" inManagedObjectContext:_managedObjectContext]];
//Assign the predicate to the fetch request
NSError *error = nil;
//Create an array from the returned objects
NSArray *fetchedObjects = [_managedObjectContext executeFetchRequest:request error:&error];
selectedTweet = [fetchedObjects objectAtIndex:row];
} else {
selectedTweet = [self.onScreenTweets objectAtIndex:row];
}
if(selectedTweet.imageURL){
//NSTableCellView *buttonCell = [tableView makeViewWithIdentifier:@"secondButtons" owner:self];
//[buttonCell setHidden:NO];
//return buttonCell;
} else {
//NSTableCellView *buttonCell = [tableView makeViewWithIdentifier:@"secondButtons" owner:self];
//[buttonCell setHidden:YES];
//return buttonCell;
}
}
} else{
NSTableCellView *cellView2 = [tableView makeViewWithIdentifier:tableColumn.identifier owner:self];
return cellView2;
}
//[cellView setWantsLayer:YES];
return cellView;
}