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私はコレクションビューに新しいセルを追加するこのコードを持っています。デリゲートとデータソースが正しく設定されています。しかしコレクションビューのセルには何も表示されませんでした。私がデバッグすると、セルが作成されたことが示されますが、セルにはUIView以外が含まれています。UIButtonにはUIImageViewが含まれているはずです。 registerClass上Objective Cで列挙型の数値を取得する方法、または列挙型を数値で設定する方法は？
- this link：
- (void)viewDidLoad { [super viewDidLoad]; [self setImgGallery:[[NSMutableArray alloc] init]]; [[self cvPictureGallery] registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"new"]; [[self cvPictureGallery] registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"review"]; // add 5 UIImage test to imgGallery. for (int i = 0; i < 5; i++) { [[self imgGallery] addObject:[UIImage named:@"test.png"]]; } } - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { return MIN ([[self imgGallery] count] + 1, 5); } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { if ([indexPath row] == [[self imgGallery] count]) { // show the camera icon UICollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"new" forIndexPath:indexPath]; if (cell == nil) { /* cell - contentView - button - camera icon */ cell = [[UICollectionViewCell alloc] initWithFrame:CGRectMake(0, 0, 100, 100)]; UIImageView * imgCameraIcon = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"camera.png"]]; [imgCameraIcon setFrame:CGRectMake(0, 0, 50, 50)]; [imgCameraIcon setContentMode:UIViewContentModeScaleAspectFit]; UIButton * btnCamera = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)]; [btnCamera addSubview:btnCamera]; [btnCamera addTarget:self action:@selector(openCameraTapped) forControlEvents:UIControlEventTouchUpInside]; [imgCameraIcon setCenter:CGPointMake([btnCamera width]/2, [btnCamera height]/2)]; [cell addSubview:btnCamera]; [cell setBackgroundColor:[UIColor whiteColor]]; [collectionView registerClass:[cell class] forCellWithReuseIdentifier:@"new"]; } return cell; } else { UICollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"review" forIndexPath:indexPath]; if (cell == nil) { /* cell - contentView - button - image selected */ cell = [[UICollectionViewCell alloc] initWithFrame:CGRectMake(0, 0, 100, 100)]; UIImageView * imgSelected = [[UIImageView alloc] initWithImage:[[self imgGallery] objectAtIndex:[indexPath row]]]; [imgSelected setFrame:CGRectMake(0, 0, 100, 100)]; [imgSelected setContentMode:UIViewContentModeScaleAspectFill]; [imgSelected setTag:1]; UIButton * btnCamera = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)]; [btnCamera addSubview:btnCamera]; [btnCamera addTarget:self action:@selector(imageTapped) forControlEvents:UIControlEventTouchUpInside]; [imgSelected setCenter:CGPointMake([btnCamera width]/2, [btnCamera height]/2)]; [cell addSubview:btnCamera]; [collectionView registerClass:[cell class] forCellWithReuseIdentifier:@"review"]; } return cell; } }は、私はこれらのQA上の参照を使用していました。
EDIT：そこに受け入れ答えとの議論に基づいて、これはまだ何も表示されません私の更新されたコード、次のとおりです。
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
if ([indexPath row] == [[self imgGallery] count]) { // show the camera icon
UICollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"new" forIndexPath:indexPath];
if (cell == nil) {
/*
cell
- contentView
- button
- camera icon
*/
cell = [[UICollectionViewCell alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
UIImageView * imgCameraIcon = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"camera.png"]];
[imgCameraIcon setFrame:CGRectMake(0, 0, 50, 50)];
[imgCameraIcon setContentMode:UIViewContentModeScaleAspectFit];
[imgCameraIcon setTag:1];
UIButton * btnCamera = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[btnCamera addSubview:imgCameraIcon];
[btnCamera addTarget:self action:@selector(openCameraTapped) forControlEvents:UIControlEventTouchUpInside];
[btnCamera setTag:2];
[imgCameraIcon setCenter:CGPointMake([btnCamera width]/2, [btnCamera height]/2)];
[cell addSubview:btnCamera];
[cell setBackgroundColor:[UIColor whiteColor]];
[collectionView registerClass:[cell class] forCellWithReuseIdentifier:@"new"];
}
UIImageView * imgCameraIcon = (UIImageView *) [cell viewWithTag:1];
[imgCameraIcon setImage:[UIImage imageNamed:@"camera.png"]];
NSLog (@"Subview count:%lu", (unsigned long)[[cell subviews] count]);
return cell;
}
else {
UICollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"review" forIndexPath:indexPath];
if (cell == nil) {
/*
cell
- contentView
- button
- image selected
*/
cell = [[UICollectionViewCell alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
UIImageView * imgSelected = [[UIImageView alloc] initWithImage:[[self imgGallery] objectAtIndex:[indexPath row]]];
[imgSelected setFrame:CGRectMake(0, 0, 100, 100)];
[imgSelected setContentMode:UIViewContentModeScaleAspectFill];
[imgSelected setClipsToBounds:YES];
[imgSelected setTag:1];
UIButton * btnImage = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[btnImage addSubview:imgSelected];
[btnImage addTarget:self action:@selector(imageTapped) forControlEvents:UIControlEventTouchUpInside];
[btnImage setTag:2];
[imgSelected setCenter:CGPointMake([btnImage width]/2, [btnImage height]/2)];
[cell addSubview:btnImage];
}
UIImageView * imgSelected = (UIImageView *) [cell viewWithTag:1];
[imgSelected setImage:[[self imgGallery] objectAtIndex:[indexPath row]]];
NSLog (@"Subview count:%lu", (unsigned long)[[cell subviews] count]);
return cell;
}
}
サブビュー・カウントの結果は常に以下1で、あります作業中のものですが、サブビュー数は毎回増えています。
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
if ([indexPath row] == [[self imgGallery] count]) { // show the camera icon
UICollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"new" forIndexPath:indexPath];
if (cell == nil) {
/*
cell
- contentView
- button
- camera icon
*/
cell = [[UICollectionViewCell alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
}
UIImageView * imgCameraIcon = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"camera.png"]];
[imgCameraIcon setFrame:CGRectMake(0, 0, 50, 50)];
[imgCameraIcon setContentMode:UIViewContentModeScaleAspectFit];
UIButton * btnCamera = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[btnCamera addSubview:imgCameraIcon];
[btnCamera addTarget:self action:@selector(openCameraTapped) forControlEvents:UIControlEventTouchUpInside];
[imgCameraIcon setCenter:CGPointMake([btnCamera width]/2, [btnCamera height]/2)];
[cell addSubview:btnCamera];
[cell setBackgroundColor:[UIColor whiteColor]];
[collectionView registerClass:[cell class] forCellWithReuseIdentifier:@"new"];
NSLog (@"Subview count:%lu", (unsigned long)[[cell subviews] count]);
return cell;
}
else {
UICollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"review" forIndexPath:indexPath];
if (cell == nil) {
/*
cell
- contentView
- button
- image selected
*/
cell = [[UICollectionViewCell alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
}
UIImageView * imgSelected = [[UIImageView alloc] initWithImage:[[self imgGallery] objectAtIndex:[indexPath row]]];
[imgSelected setFrame:CGRectMake(0, 0, 100, 100)];
[imgSelected setContentMode:UIViewContentModeScaleAspectFill];
[imgSelected setClipsToBounds:YES];
[imgSelected setTag:1];
UIButton * btnImage = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[btnImage addSubview:imgSelected];
[btnImage addTarget:self action:@selector(imageTapped) forControlEvents:UIControlEventTouchUpInside];
[imgSelected setCenter:CGPointMake([btnImage width]/2, [btnImage height]/2)];
[cell addSubview:btnImage];
[collectionView registerClass:[cell class] forCellWithReuseIdentifier:@"review"];
NSLog (@"Subview count:%lu", (unsigned long)[[cell subviews] count]);
return cell;
}
}
collectionview登録クラスが上にする必要があります見てください？ – Joshua
@Joshua選択した正解の解決策を実行した後、正しく結果が得られます。私はあなたがそのcollectionViewの生涯に一度それを登録する必要があると思います。 –
しかし、あなたの選択した答えを読んで、私はそれが正しくセルを再利用しないと思う。 – Joshua