ios 如何以编程方式在 uicollectionview 中插入图像？
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How to insert images in uicollectionview programmatically?
提问by user3239274
I'm pretty new to Objective-C so hopefully this all makes sense..I ran code provided in first answer Creating a UICollectionView programmatically..It is working fine .Now i want to add some pictures in cell that can expanded by mouse click .I searched many tutorial but all using nib files or storyboard files .How i can accomplish this task programmatically ?
我对Objective-C很陌生所以希望这一切都有意义..我运行了第一个答案中提供的代码以编程方式创建UICollectionView..它工作正常.现在我想在单元格中添加一些可以通过鼠标单击展开的图片。我搜索了很多教程，但都使用 nib 文件或故事板文件。我如何以编程方式完成此任务？
Any help would be greatly appreciated. Thanks in advance.
任何帮助将不胜感激。提前致谢。
采纳答案by codercat
Beginner read tutroial and understand first everyting in below link and apple doc
初学者阅读教程并首先了解以下链接和苹果文档中的所有内容
ios-programming-uicollectionview-tutorial-with-sample-code
ios-programming-uicollectionview-tutorial-with-sample-code
change this your blackground color like this approach
像这种方法一样改变你的黑底色
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];
UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image = [UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]];
cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"photo-frame.png"]];
[self.view addSubview:recipeImageView];
cell.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]]];
return cell;
}
output:
输出：
回答by ingconti
as Logan suggest:
正如洛根建议的那样：
#define IMG_TAG 1000
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"MyCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
// Configure the cell...
cell.textLabel.text = @"test.....";
UIImage * img = [UIImage imageNamed: @"sampleImage"];
UIImageView * customImageView = (UIImageView*) [cell viewWithTag: IMG_TAG];
// two cases:
// 1) we got a "recycled" cell, so we already have an image view added
// 2) we got a "new" cell, so we must create, add image view AND TAg
// in both cases we will set image
if (customImageView){
// case 1
// nothing special
}else{
// case 2:
// add and tag:
customImageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 2, 30, 30)];
[cell addSubview: customImageView];
customImageView.tag = IMG_TAG;
}
customImageView.image = img;
return cell;
}
pls review and upvote :)
请和upvote :)
回答by ingconti
NOTE:
笔记：
code above is WRONG!
上面的代码是错误的！
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];
UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image = [UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]];
cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"photo-frame.png"]];
[self.view addSubview:recipeImageView];
cell.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]]];
return cell;
}
You allocate (better to allocate ONCE unsung TAGs...) but the code will ADD subview EVERY time cellForItemAtIndexPath is called.
您分配（最好分配一次无名标签......）但代码将在每次调用 cellForItemAtIndexPath 时添加子视图。
