テーブル ビュー セルに存在する UIImage に画像を非同期的に読み込もうとしています。正しい画像を表示する前に、別のセルの画像を 1 秒間表示することがあります。
これは私が使用しているコードです
[[TMCache sharedCache] objectForKey:post[@"gif"] block:^(TMCache *cache, NSString *key, id object) {
if (object) {
if ([self isRowZeroVisible:indexPath.section]) {
[GIFLoader loadGIFData:object to:postGif for:feedTableView];
}
return;
}
dispatch_async(dispatch_get_main_queue(), ^{
__block NSURL* url = [NSURL URLWithString:post[@"gif"]];
NSURLRequest* req = [NSURLRequest requestWithURL:url];
OHURLLoader* loader = [OHURLLoader URLLoaderWithRequest:req];
[loader startRequestWithResponseHandler:nil
progress:nil
completion:^(NSData* receivedData, NSInteger httpStatusCode) {
if ([self isRowZeroVisible:indexPath.section]) {
[GIFLoader loadGIFData:receivedData to:postGif for:feedTableView];
}
[[TMCache sharedCache] setObject:receivedData forKey:post[@"gif"]];
} errorHandler:nil];
});
}];
[GIFLoader loadGIFData:receivedData to:postGif for:feedTableView]; is a method I created that loads GIFs in a uiimageview. it does that in a background thread and then assigns the Image in the main thread though.
非同期読み込みのために従わなければならない特定のプラクティスはありますか?
コードの何が問題なのかわかりません。どんな助けでも大歓迎です
編集
//Loading stuff into tableView
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
@autoreleasepool {
//Type of Cells
static NSString *simpleTableImageIdentifier = @"gifCell";
static NSString *simpleTableBodyIdentifier = @"bodyCell";
static NSString *simpleTableActionsIdentifier = @"actionsCell";
UITableViewCell *cell = nil;
//Data that goes in the cell
NSDictionary *post = [dataArray objectAtIndex:indexPath.section];
//User info
UIImageView *userAvatar;
UILabel *postUserFullNameLabel;
UILabel *postUsername;
//GIF Date
OHAttributedLabel* gifDate = nil;
NSMutableAttributedString* gifDateString;
//Feed GIF
NSString *gifBody = [[NSString alloc]init];
OHAttributedLabel* attrLabel = nil;
NSMutableAttributedString* mas;
//Location
OHAttributedLabel* gifLocation = nil;
NSMutableAttributedString* gifLocationString;
UILabel *locationBg;
//Buttons
UIButton *btn1 =[[UIButton alloc] initWithFrame:CGRectMake(11,0,50,30)];
UIButton *btn2 =[[UIButton alloc] initWithFrame:CGRectMake(69,0,50,30)];
UIButton *btn3 =[[UIButton alloc] initWithFrame:CGRectMake(259,0,50,30)];
if (indexPath.row == 0) {
cell = [tableView dequeueReusableCellWithIdentifier:simpleTableImageIdentifier];
if (cell == nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableImageIdentifier];
}
__block UIImageView *postGif= (UIImageView *)[cell viewWithTag:104];
postGif.image = nil;
[[TMCache sharedCache] objectForKey:post[@"gif"] block:^(TMCache *cache, NSString *key, id object) {
if (object) {
if ([self isRowZeroVisible:indexPath.section]) {
[GIFLoader loadGIFData:object to:postGif for:feedTableView];
}
return;
}
dispatch_async(dispatch_get_main_queue(), ^{
__block NSURL* url = [NSURL URLWithString:post[@"gif"]];
NSURLRequest* req = [NSURLRequest requestWithURL:url];
OHURLLoader* loader = [OHURLLoader URLLoaderWithRequest:req];
[loader startRequestWithResponseHandler:nil
progress:nil
completion:^(NSData* receivedData, NSInteger httpStatusCode) {
if ([self isRowZeroVisible:indexPath.section]) {
[GIFLoader loadGIFData:receivedData to:postGif for:feedTableView];
}
[[TMCache sharedCache] setObject:receivedData forKey:post[@"gif"]];
} errorHandler:nil];
});
}];
postGif.layer.cornerRadius = 2.0;
postGif.layer.masksToBounds = YES;
postGif.clipsToBounds = YES;
locationBg = (UILabel *)[cell viewWithTag:106];
userAvatar = (UIImageView *)[cell viewWithTag:100];
if ([post [@"user_avatar"] length ] > 0) {
NSString *img = [@"https://d1f7i732a4e7fw.cloudfront.net/" stringByAppendingString:post [@"user_avatar"]];
[userAvatar setImageWithURL:[NSURL URLWithString:img] placeholderImage:[UIImage imageNamed:@"userDefaultPicture.png"]];
}else{
userAvatar.image = [UIImage imageNamed:@"userDefaultPicture.png"];
}
userAvatar.layer.cornerRadius = 18.0;
userAvatar.layer.borderWidth = 1.0;
userAvatar.layer.borderColor = (__bridge CGColorRef)([UIColor lightGrayColor]);
userAvatar.clipsToBounds = YES;
postUserFullNameLabel = (UILabel *)[cell viewWithTag:101];
postUserFullNameLabel.text = post[@"user_fullname"];
postUsername = (UILabel *)[cell viewWithTag:102];
postUsername.text = [NSString stringWithFormat:@"@%@",post[@"user_username"]];
gifDate = [[OHAttributedLabel alloc] initWithFrame:CGRectMake(246,9,60,21)];
gifDate.autoresizingMask = UIViewAutoresizingNone;
gifDate.centerVertically = YES;
gifDate.highlightedTextColor = [UIColor whiteColor];
gifDate.tag = 103;
gifDate.backgroundColor = [UIColor clearColor];
gifDate.extendBottomToFit = NO;
gifDateString = [NSMutableAttributedString attributedStringWithString:[NSString stringWithFormat:@"\ue003 %@",post[@"date"]]];
[gifDateString setFont:[UIFont fontWithName:@"Helvetica Neue" size:12.0]];
[gifDateString setFont:[UIFont fontWithName:@"icomoon" size:10.0] range:NSMakeRange(0,1)];
[gifDateString setTextColor:[UIColor whiteColor]];
[gifDateString setTextAlignment:kCTTextAlignmentRight lineBreakMode:kCTLineBreakByTruncatingTail];
[OHASBasicMarkupParser processMarkupInAttributedString:gifDateString];
gifDate.attributedText = gifDateString;
if (!(post[@"latitude"] == (id)[NSNull null])){
//Location of the Post
gifLocation = [[OHAttributedLabel alloc] initWithFrame:CGRectMake(165,27,141,21)];
gifLocation.autoresizingMask = UIViewAutoresizingNone;
gifLocation.centerVertically = YES;
gifLocation.highlightedTextColor = [UIColor whiteColor];
gifLocation.tag = 107;
gifLocation.backgroundColor = [UIColor clearColor];
gifLocation.extendBottomToFit = NO;
gifLocationString = [NSMutableAttributedString attributedStringWithString:[NSString stringWithFormat:@"\uf041 %@",post[@"locationName"]]];
[gifLocationString setFont:[UIFont fontWithName:@"Helvetica Neue" size:12.0]];
[gifLocationString setFont:[UIFont fontWithName:@"icomoon" size:12.0] range:NSMakeRange(0,1)];
[gifLocationString setTextColor:[UIColor whiteColor]];
[gifLocationString setTextAlignment:kCTTextAlignmentRight lineBreakMode:kCTLineBreakByTruncatingTail];
[OHASBasicMarkupParser processMarkupInAttributedString:gifLocationString];
gifLocation.attributedText = gifLocationString;
}
}
else if (indexPath.row == 1) {
cell = [tableView dequeueReusableCellWithIdentifier:simpleTableBodyIdentifier];
if (cell == nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableBodyIdentifier];
}
//Body of GIF
// Add more from here http://www.easyapns.com/iphone-emoji-alerts
gifBody = post[@"body"];
attrLabel = [[OHAttributedLabel alloc] initWithFrame:CGRectMake(10,5,kLabelWidth,tableView.rowHeight-2*kLabelVMargin)];
attrLabel.autoresizingMask = UIViewAutoresizingFlexibleHeight;
attrLabel.centerVertically = NO;
attrLabel.automaticallyAddLinksForType = NSTextCheckingAllTypes;
attrLabel.delegate = self;
attrLabel.highlightedTextColor = UIColorFromRGB(0x333333);
attrLabel.tag = kAttributedLabelTag;
attrLabel.backgroundColor = [UIColor clearColor];
attrLabel.extendBottomToFit = YES;
[cell.contentView addSubview:attrLabel];
attrLabel = (OHAttributedLabel*)[cell viewWithTag:kAttributedLabelTag];
mas = [NSMutableAttributedString attributedStringWithString:gifBody];
[mas setFont:[UIFont fontWithName:@"Helvetica Neue" size:14.0]];
[mas setTextColor:UIColorFromRGB(0x333333)];
[mas setTextAlignment:kCTTextAlignmentLeft lineBreakMode:kCTLineBreakByWordWrapping];
[OHASBasicMarkupParser processMarkupInAttributedString:mas];
attrLabel.attributedText = mas;
}
else if (indexPath.row == 2) {
cell = [tableView dequeueReusableCellWithIdentifier:simpleTableActionsIdentifier];
if (cell == nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableActionsIdentifier];
}
[self customizeButtons:btn1];
btn1.tag = (indexPath.section +1)*200;
btn1.titleLabel.font = [UIFont fontWithName:@"icomoon" size:16.0];
if ([post[@"is_Favoring"] boolValue]) {
[btn1 setTitleColor:UIColorFromRGB(0xE4717A) forState:UIControlStateNormal];
}else{
[btn1 setTitleColor:[UIColor lightGrayColor] forState:UIControlStateNormal];
}
[btn1 setTitle:@"\uf004" forState:UIControlStateNormal];
btn1.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
[btn1 addTarget:self
action:@selector(favorAction:)
forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:btn1];
[self customizeButtons:btn2];
btn2.tag = (indexPath.section +1)*2000;
btn2.titleLabel.font = [UIFont fontWithName:@"icomoon" size:16.0];
[btn2 setTitleColor:[UIColor lightGrayColor] forState:UIControlStateNormal];
[btn2 setTitle:@"\ue000" forState:UIControlStateNormal];
[cell.contentView addSubview:btn2];
btn2.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
[btn2 addTarget:self
action:@selector(commentAction:)
forControlEvents:UIControlEventTouchUpInside];
[self customizeButtons:btn3];
btn3.titleLabel.font = [UIFont fontWithName:@"icomoon" size:16.0];
[btn3 setTitleColor:[UIColor lightGrayColor] forState:UIControlStateNormal];
[btn3 setTitle:@"\ue001" forState:UIControlStateNormal];
btn3.tag = (indexPath.section +1)*20000;
[cell.contentView addSubview:btn3];
btn3.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
[btn3 addTarget:self
action:@selector(otherAction:)
forControlEvents:UIControlEventTouchUpInside];
}
//Paginiation
if (indexPath.section == [dataArray count]-4 && indexPath.row == 1) {
[self loadNextPage];
}
return cell;
}
}