UIview (ヘッダーとして機能)、UIImage、および 10 個の UILabels を含むサブビューを作成します。これらを UICollectionView にセルとして入れています。
完全に設計すると、スムーズにスクロールしません。すべての UILabels を削除すると、スムーズにスクロールします。
UICollectionView がオンデマンドで読み込まれるのが遅いため、新しいセルが必要になると、それを描画する必要があり、メインスレッドがロックされると思います。
iOSがそれらを作成するのに処理するには多すぎるというだけの問題ですか? もしそうなら、それにテキストを入れる別の方法はありますか?
私の細胞がどのように見えるか:
ここに DatasetFilterListPanelView があります。これにより、UICollectionViewCell に入れた UIView が作成されます。UICollectionViewを使用する前にこれを作成したため、このようにしました。
@implementation DatasetFilterListPanelView
-(id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
self.translatesAutoresizingMaskIntoConstraints = FALSE;
UIView *contentView = [self createContentView];
[self addSubview:contentView];
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[contentView]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(contentView)]];
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[contentView]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(contentView)]];
}
return self;
}
-(UIView *) createContentView {
UIView *contentView = [[UIView alloc] initWithFrame:self.frame];
// contentView.translatesAutoresizingMaskIntoConstraints = FALSE;
contentView.backgroundColor = [UIColor myDarkGrayColor];
UIView *headerView = [self createHeaderView];
[contentView addSubview:headerView];
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[headerView]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(headerView)]];
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[headerView]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(headerView)]];
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"gear12.png"]];
imageView.translatesAutoresizingMaskIntoConstraints = FALSE;
imageView.backgroundColor = [UIColor blueColor];
self.imageView = imageView;
[imageView addConstraint:[NSLayoutConstraint constraintWithItem:imageView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:imageView attribute:NSLayoutAttributeWidth multiplier:1 constant:0]];
[contentView addSubview:imageView];
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[imageView]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(imageView)]];
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[headerView]-[imageView]-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(headerView, imageView)]];
UILabel *acresLabel = [self createLabelWithTitle:@"Label01:" andFont:[UIFont fontWithName:HELVETICA_FONT_STYLE_BOLD size:12]];
[contentView addSubview:acresLabel];
UILabel *addedLabel = [self createLabelWithTitle:@"Label02:" andFont:[UIFont fontWithName:HELVETICA_FONT_STYLE_BOLD size:12]];
[contentView addSubview:addedLabel];
UILabel *typeLabel = [self createLabelWithTitle:@"Label03:" andFont:[UIFont fontWithName:HELVETICA_FONT_STYLE_BOLD size:12]];
[contentView addSubview:typeLabel];
UILabel *zonesLabel = [self createLabelWithTitle:@"Label04:" andFont:[UIFont fontWithName:HELVETICA_FONT_STYLE_BOLD size:12]];
[contentView addSubview:zonesLabel];
UILabel *sceneLabel = [self createLabelWithTitle:@"Label05:" andFont:[UIFont fontWithName:HELVETICA_FONT_STYLE_BOLD size:12]];
[contentView addSubview:sceneLabel];
UILabel *acresValueLabel = [self createLabelWithTitle:@"Data" andFont:[UIFont fontWithName:HELVETICA_FONT_STYLE size:12]];
acresValueLabel.textAlignment = NSTextAlignmentLeft;
[contentView addSubview:acresValueLabel];
UILabel *addedValueLabel = [self createLabelWithTitle:@"Data" andFont:[UIFont fontWithName:HELVETICA_FONT_STYLE size:12]];
addedValueLabel.textAlignment = NSTextAlignmentLeft;
[contentView addSubview:addedValueLabel];
UILabel *typeValueLabel = [self createLabelWithTitle:@"Name" andFont:[UIFont fontWithName:HELVETICA_FONT_STYLE size:12]];
typeValueLabel.textAlignment = NSTextAlignmentLeft;
[contentView addSubview:typeValueLabel];
UILabel *zonesValueLabel = [self createLabelWithTitle:@"Data" andFont:[UIFont fontWithName:HELVETICA_FONT_STYLE size:12]];
zonesValueLabel.textAlignment = NSTextAlignmentLeft;
[contentView addSubview:zonesValueLabel];
UILabel *sceneValueLabel = [self createLabelWithTitle:@"Name" andFont:[UIFont fontWithName:HELVETICA_FONT_STYLE size:12]];
sceneValueLabel.textAlignment = NSTextAlignmentLeft;
[contentView addSubview:sceneValueLabel];
NSDictionary *views = NSDictionaryOfVariableBindings(headerView, imageView, acresLabel, acresValueLabel, addedLabel, addedValueLabel, typeLabel, typeValueLabel, zonesLabel, zonesValueLabel, sceneLabel, sceneValueLabel);
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[headerView]-[acresLabel]"
options:0
metrics:nil
views:views]] ;
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[acresLabel]-[addedLabel(==acresLabel)]-[typeLabel(==acresLabel)]-[zonesLabel(==acresLabel)]-[sceneLabel(==acresLabel)]-|"
options:NSLayoutFormatAlignAllRight
metrics:0
views:views]];
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[acresValueLabel]-[addedValueLabel(==acresLabel)]-[typeValueLabel(==acresLabel)]-[zonesValueLabel(==acresLabel)]-[sceneValueLabel(==acresLabel)]-|"
options:NSLayoutFormatAlignAllLeft
metrics:nil
views:views]];
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[imageView]-20-[acresLabel]-[acresValueLabel]" options:0 metrics:nil views:views]];
return contentView;
}
-(UIView *)createHeaderView {
UIView *view = [UIView new];
view.translatesAutoresizingMaskIntoConstraints = FALSE;
view.backgroundColor = [UIColor blueColor];
view.clipsToBounds = YES;
[view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[view(30)]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(view)]];
UILabel *title = [UILabel new];
title.translatesAutoresizingMaskIntoConstraints = FALSE;
title.text = @"Default text";
title.font = [UIFont fontWithName:HELVETICA_FONT_STYLE_BOLD size:14];
title.textColor = [UIColor whiteColor];
title.backgroundColor = [UIColor clearColor];
self.headerLabel = title;
[view addSubview:title];
[view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[title]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(title)]];
[view addConstraint:[NSLayoutConstraint constraintWithItem:title attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:view attribute:NSLayoutAttributeCenterY multiplier:1 constant:0]];
self.headerGradient = [UIColor grayGradient];
self.headerGradient.frame = CGRectMake(0, 0, 360, 30);
[view.layer insertSublayer:self.headerGradient atIndex:0];
return view;
}
-(UILabel *)createLabelWithTitle:(NSString *)title andFont:(UIFont *)font; {
UILabel *label = [UILabel new];
label.translatesAutoresizingMaskIntoConstraints = FALSE;
label.text = title;
label.font = font;
label.textAlignment = NSTextAlignmentRight;
label.textColor = [UIColor whiteColor];
label.backgroundColor = [UIColor clearColor];
return label;
}
ここに私のUICollectionViewCellファイルがあります.DatasetFilterListPanelViewだけaddSubview
です。
@implementation DatasetViewCell
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self addSubview:[[DatasetFilterListPanelView alloc] initWithFrame:CGRectMake(0, 0, 360, 160)]];
}
return self;
}
UIScrollview で同じパネルを使用すると、それらがすべて読み込まれて配置されると、スムーズにスクロールします。したがって、UICollectionView のオンデマンドでセルをロードする必要があります。
この UICollectionView チュートリアルに従いました
編集:セルの作成:
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
DatasetViewCell *datasetCell = [collectionView dequeueReusableCellWithReuseIdentifier:DatasetCellIdentifier forIndexPath:indexPath];
return datasetCell;
}
編集 2: インストルメント トレース: