非同期イメージに問題があると、なぜこの奇妙な問題が発生するのかわかりません。非同期画像読み込み手法を適用していますが、スクロール時に画像が読み込まれると、画像はフリーズしません。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell=[self getCellContentView:CellIdentifier];
}
[cell setBackgroundColor:[UIColor redColor]];
NSLog(@"%i",[discussionArray count]);
NSDictionary *dict=[discussionArray objectAtIndex:indexPath.row];
UILabel *textLabel1 = (UILabel *)[cell viewWithTag:1];
UILabel *textLabel2 = (UILabel *)[cell viewWithTag:2];
UILabel *textLabel3 = (UILabel *)[cell viewWithTag:3];
UIImageView *avatarimage = (UIImageView *)[cell viewWithTag:4];
UIImageView *new_oldimage = (UIImageView *)[cell viewWithTag:5];
UIImageView *avatarimage_cover = (UIImageView *)[cell viewWithTag:6];
textLabel1.text =[dict objectForKey:@"user"];
textLabel2.text =[dict objectForKey:@"date"];
textLabel3.text =[dict objectForKey:@"text"];
NSString *photoStrn=[dict objectForKey:@"photo"];
avatarimage.image = nil;
dispatch_async(dispatch_get_global_queue(0,0), ^{
NSString *u=[NSString stringWithFormat:@"http://%@",photoStrn];
NSURL *imageURL=[NSURL URLWithString:u];
NSData *imageData = [NSData dataWithContentsOfURL:imageURL];
dispatch_sync(dispatch_get_main_queue(), ^{
UIImage *dpImage = [UIImage imageWithData:imageData];
if (dpImage==nil)
{
dpImage = [UIImage imageNamed:@"profileImage.png"];
}
[UIView animateWithDuration:5.0 animations:^{
avatarimage.alpha = 1.0;
}];
avatarimage.image = dpImage;
});
});
avatarimage_cover.image = [UIImage imageNamed:@"avtrcover.png"];
NSString *new=[dict objectForKey:@"new"];
if ([new isEqualToString:@"0"])
{
new_oldimage.image = [UIImage imageNamed:@"old_message.png"];
}
else
{
new_oldimage.image = [UIImage imageNamed:@"new_message.png"];
}
textLabel3.numberOfLines = 0;
NSString *detailText = [[discussionArray objectAtIndex:indexPath.row] objectForKey:@"text"];
CGSize textSize = [detailText sizeWithFont:[UIFont boldSystemFontOfSize:13] constrainedToSize:CGSizeMake(240, MAXFLOAT) lineBreakMode:UILineBreakModeWordWrap];
textLabel3.frame = CGRectMake(70, 53, 240, textSize.height+detailTextoffset );
return cell;
}