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我有一個UICollectionView，我在viewDidLoad中設置並在此之後立即添加圖像。當用戶滾動到某一點我嘗試加入更多的圖像，但該集合視圖不會加載新的圖像將更多圖像添加到已經運行的UICollectionView中
我如何重裝或
#pragma mark - New Retrieve
- (void) rwDataToPlist {
// Step1: Get plist file path
NSArray *sysPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory ,NSUserDomainMask, YES);
NSString *documentsDirectory = [sysPaths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"news.plist"];
NSLog(@"Plist File Path: %@", filePath);
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
stuff = [[NSArray alloc] initWithContentsOfFile:filePath];
//NSLog(@"Stuff %@", stuff);
[self sortRetrievedData];
} else {
}
}
-(void)sortRetrievedData {
titles = [stuff valueForKey:kKeyTitle];
thumbMediaUrl = [stuff valueForKey:kKeyThumbUrl];
thumbWidth = [stuff valueForKey:kKeyThumbWidth];
thumbHeight = [stuff valueForKey:kKeyThumbHeight];
for(NSArray *array in titles) {
for (NSArray *realArray in array) {
titles = realArray;
}
}
for(NSArray *array in thumbMediaUrl) {
for(NSDictionary *dict in array) {
thumbMediaUrl = dict;
}
}
for(NSArray *array in thumbWidth) {
for(NSDictionary *dict in array) {
thumbWidth = dict;
}
}
for(NSArray *array in thumbHeight) {
for(NSDictionary *dict in array) {
thumbHeight = dict;
}
}
}
#pragma mark - Collection View
#pragma mark - Display Collection
-(void)displayCollection {
UIColor *myColor = [UIColor colorWithRed:(245.0/255.0) green:(245.0/255.0) blue:(245.0/255.0) alpha: 1];
CGRect screenBound = [[UIScreen mainScreen] bounds];
CGSize screenSize = screenBound.size;
CGFloat screenWidth = screenSize.width;
CGFloat screenHeight = screenSize.height;
self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
CGRect locOfScree = CGRectMake(0, 64, screenWidth, screenHeight - 44);
UICollectionViewFlowLayout *layout=[[UICollectionViewFlowLayout alloc] init];
imageDisplayer = [[UICollectionView alloc] initWithFrame:locOfScree collectionViewLayout:layout];
[imageDisplayer setDataSource:self];
[imageDisplayer setDelegate:self];
UINib *nib = [UINib nibWithNibName:@"CollectionViewCell" bundle:nil];
[imageDisplayer registerNib:nib forCellWithReuseIdentifier:CellIdentifier];
[imageDisplayer setBackgroundColor:myColor];
[self.view insertSubview:imageDisplayer belowSubview:navBar];
//[self.view addSubview:imageDisplayer];
}
#pragma mark - Setup
- (void)setupData
{
self.imageURLStrings = [NSMutableArray array];
// Save image to docs directory so we can get a nice URL
// Not sure how to get the URL from an asset catalog off the top of my head
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"greyBurger.png"];
UIImage *image = [UIImage imageNamed:@"greyBurger"];
NSData *data = UIImagePNGRepresentation(image);
[data writeToFile:path atomically:YES];
// Populate our imageURLStrings array with many paths
for (NSInteger i = 0; i < NumberOfImages; i++)
{
[self.imageURLStrings addObject:path];
//NSLog(@"Path %@", path);
}
}
- (void)setupCollectionView
{
UINib *nib = [UINib nibWithNibName:@"CollectionViewCell" bundle:nil];
[self.collectionView registerNib:nib forCellWithReuseIdentifier:CellIdentifier];
}
#pragma mark - UICollectionView Datasource
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
//return [self.imageURLStrings count];
return [titles count];
//return 2;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
CollectionViewCell *cell = (CollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];
//NSLog(@"CELL FOR COUNT:%lu", [titles count]);
NSString *title = [titles objectAtIndex:indexPath.row];
cell.backgroundColor = [UIColor whiteColor];
NSString *imageUrl = [thumbMediaUrl objectForKey:title];
NSURL *thumbUrl = [NSURL URLWithString:imageUrl];
UIImageView *imageView = [[UIImageView alloc] init];
NSData *imageData = [NSData dataWithContentsOfURL:thumbUrl];
imageView.image = [UIImage imageWithData:imageData];
cell.backgroundView = imageView;
cell.layer.shouldRasterize = YES;
cell.layer.rasterizationScale = [UIScreen mainScreen].scale;
//cell.frame = CGRectMake(0, 0, 100, 100);
//cell.imageURLString = [self.imageURLStrings objectAtIndex:indexPath.item];
return cell;
}
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
CGRect screenBound = [[UIScreen mainScreen] bounds];
CGSize screenSize = screenBound.size;
CGFloat screenWidth = screenSize.width;
NSString *title = [titles objectAtIndex:indexPath.row];
float width = [[thumbWidth objectForKey:title] floatValue];
float height = [[thumbHeight objectForKey:title] floatValue];
float imageWidth = (screenWidth/2) - 3;
float scale = imageWidth/width;
float imageHeight = height * scale;
CGSize imageSize = CGSizeMake(imageWidth, imageHeight);
return imageSize;
}
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
return 2.0;
}
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
return 2.0;
}
// Layout: Set Edges
- (UIEdgeInsets)collectionView:
(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
// return UIEdgeInsetsMake(0,8,0,8); // top, left, bottom, right
return UIEdgeInsetsMake(0,0,0,0); // top, left, bottom, right
}
- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect
{
NSArray* attributesToReturn = [self layoutAttributesForElementsInRect:rect];
for (UICollectionViewLayoutAttributes* attributes in attributesToReturn)
{
if (nil == attributes.representedElementKind)
{
NSIndexPath* indexPath = attributes.indexPath;
attributes.frame = [self layoutAttributesForItemAtIndexPath:indexPath].frame;
}
}
return attributesToReturn;
}
- (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewLayoutAttributes* currentItemAttributes = [self layoutAttributesForItemAtIndexPath:indexPath];
if (indexPath.item < numColumns){
CGRect f = currentItemAttributes.frame;
f.origin.y = 0;
currentItemAttributes.frame = f;
return currentItemAttributes;
}
NSIndexPath* ipPrev = [NSIndexPath indexPathForItem:indexPath.item-numColumns inSection:indexPath.section];
CGRect fPrev = [self layoutAttributesForItemAtIndexPath:ipPrev].frame;
CGFloat YPointNew = fPrev.origin.y + fPrev.size.height + 10;
CGRect f = currentItemAttributes.frame;
f.origin.y = YPointNew;
currentItemAttributes.frame = f;
return currentItemAttributes;
}
我已經改變了添加更多圖片到我的滾動視圖我的代碼基於前兩個答案的建議，現在我必須將圖像添加到正在運行的視圖中。並且使每列都有自己獨立的高度所以在每個邊緣2px的間距，這就是我試圖重新載入數據
-(void)refreshView {
[self rwDataToPlist];
[self.collectionView reloadData];
[self setupCollectionView];
}
如果我是你，我會用一個UITableView代替它，而不是d實現「正常」無限滾動過程。使用自定義單元格的表格視圖可以處理滾動/內容大小/框架問題，如果您自己完成所有這些工作，則必須處理這些問題。 – Mike 2014-09-02 21:57:30
@inVINCEable您需要輸入CollectionView底部意味着您將添加一些數據嗎？ – PREMKUMAR 2014-09-03 11:32:27
引用編輯2：你的'thumbMediaUrl'從哪裏來？它是一個模型或字典實際上有一個屬性（在運行時）正確的名稱爲'title'？ – schmubob 2014-09-05 17:20:12