[英]How restrict tableview to fill cell second time if it filled first time
在我的TableView中,我正在设置图像和两个标签,它填充得很好。 但是,当我向下滚动TableView然后重新查看该已填充的单元格时,它将重新填充。 现在,我用来自URL的图像填充ImageView,以便为用户创建负载。
所以我可以限制我的TableView吗,如果我的单元格第一次被填充,它将不会再次填充。
这是我的代码:
- (UITableViewCell *)tableView:(UITableView *)atableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *SimpleTableIdentifier = @"SimpleTableIdentifier";
UITableViewCell * cell = [atableView dequeueReusableCellWithIdentifier: nil];
if(cell == nil) {
cell = [[UITableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:SimpleTableIdentifier];
ChannelList *channelList = nil;
if (searchedData.count ==0) {
channelList = [channelAllData objectAtIndex:[indexPath section]];
} else {
channelList = [searchedData objectAtIndex:[indexPath section]];
}
UIImageView *aImageView = [[UIImageView alloc] initWithFrame:CGRectMake(20, 10, 50, 50)];
aImageView.image = [UIImage imageNamed:@"tv-defolt.png"];
NSString * mystr = [channelList channelLogo];
if (mystr.length !=0) {
//get a dispatch queue
dispatch_queue_t concurrentQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
//this will start the image loading in bg
dispatch_async(concurrentQueue, ^{
NSString * str = [NSString stringWithFormat:@"http://manektech.net/mttv/Channel/%@",[channelList channelLogo]];
NSData *image = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:str]];
//this will set the image when loading is finished
dispatch_async(dispatch_get_main_queue(), ^{
aImageView.image = [UIImage imageWithData:image];
});
});
} else {
aImageView.image = [UIImage imageNamed:@"tv-defolt.png"];
}
[cell addSubview:aImageView];
UILabel *nameTextLabel = [[UILabel alloc] initWithFrame: CGRectMake(80, 15, 175, 20)];
nameTextLabel.textColor = [UIColor blackColor];
nameTextLabel.backgroundColor = [UIColor clearColor];
nameTextLabel.text = [channelList channelName];
nameTextLabel.font = [UIFont fontWithName:@"Arial" size:14];
[cell addSubview:nameTextLabel];
UILabel *genreTextLabel = [[UILabel alloc] initWithFrame: CGRectMake(80, 35, 175, 20)];
genreTextLabel.textColor = [UIColor grayColor];
genreTextLabel.backgroundColor = [UIColor clearColor];
NSString * str = [NSString stringWithFormat:@"%@ | %@",[channelList channelType],[channelList channelCounry]];
genreTextLabel.text = str;
genreTextLabel.font = [UIFont fontWithName:@"Arial" size:14];
[cell addSubview:genreTextLabel];
cell.selectionStyle = UITableViewCellSelectionStyleGray;
}
return cell;
}
尝试这种逻辑,可能会为您服务。
- (UITableViewCell *)tableView:(UITableView *)atableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *SimpleTableIdentifier = [NSString stringWithFormat:@"Cell%d%d",indexPath.section,indexPath.row]; /// set different idenfifier for all cell
UITableViewCell * cell = [atableView dequeueReusableCellWithIdentifier: SimpleTableIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:SimpleTableIdentifier] autorelease];
/// Add UIImageView and UILable here
}
}
我希望这对您有帮助。
您应该使用SDWebImage避免延迟表滚动。 它使用缓存,避免每次都请求图像URL。
克里特岛之间的UILabel
和UIImageview
if(cell == nil)
{
cell = [[UITableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault
.
.
.
// create `UILabel` and `UIImageview` here add add it to cell.contentView
}
两者都在cell.contentView
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