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UIScrollViewオブジェクトからいくつかの属性を表示するためにautolayout を使用しています。この情報を Web サービスから動的にダウンロードします。スクロールビューの幅は一定で (垂直スクロール動作をしたくないため)、そのサブビューは一連の制約でこの幅を尊重しますが、UILabelの高さを動的に増やすことはできません。

私はすべてをコーディングし、viewDidLoadセレクターを使用してサブビューを作成します...

- (void)viewDidLoad {
    [super viewDidLoad];
    .
    .
    .

    UILabel *descriptionLabel = [[UILabel alloc] initWithFrame:CGRectZero];
    descriptionLabel.translatesAutoresizingMaskIntoConstraints = NO;
    descriptionLabel.numberOfLines = 0;
    descriptionLabel.lineBreakMode = NSLineBreakByWordWrapping;
    descriptionLabel.opaque = YES;
    descriptionLabel.backgroundColor = [UIColor clearColor];
    descriptionLabel.textColor = [UIColor whiteColor];
    descriptionLabel.textAlignment = NSTextAlignmentRight;
    descriptionLabel.font = [UIFont appetitoMediumItalicFontWithSize:15.0f];
    descriptionLabel.text = NSLocalizedStringFromTable(@"APT_DISH_DETAIL_DESCRIPTION", @"DishDetail", @"Etiqueta que contiene la descripción del platillo");
    [descriptionLabel setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisVertical];
    [self.detailContentScrollView addSubview:descriptionLabel];
    self.descriptionLabelS = descriptionLabel;

    .
    .
    .
}

self.detailContentScrollView変数を見ることができます。これはIBOuletView Controllerのペン先から作成されたものです。

次に、updateConstraintsセレクターを使用します...

- (void)updateConstraints {
[super updateConstraints];
// This dictionary has more variables, ok
NSDictionary *viewsDict = @{@"dish_description_label": self.descriptionLabelS};
.
.
.

[self.descriptionLabelS setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisVertical];
[self.detailContentScrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-[view1][dish_description_label]-[view2][view3][view4]-|" options:0 metrics:nil views:viewsDict]];

.
.
.
}

最後に、Web サービスの情報を受け取ると、スクロールビューからsizeToFitのUILabelセレクターを送信layoutIfNeededします。しかし、UILabel新しいコンテンツでサイズが変更されることはありません。私は何を間違っていますか？

4

4 に答える 4

7

ビューで作成したい場合：

  • 制約の高さ >= [必要な最小値] で UIScrollview を追加します (例: 480)。

  • 高さの制約 >= [最小値] で UILabel をスクロールビューに追加します (例: 460)。

次の画像のように:

scrollView の制約 ラベル制約 ビューコントローラー 出力はそのようなものになります

プログラムで作成する必要がある場合

UIScrollView *scrollView= [UIScrollView new];
    scrollView.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:scrollView];

    UILabel *scrollViewLabel = [[UILabel alloc] init];
    scrollViewLabel.numberOfLines = 0;
    scrollViewLabel.translatesAutoresizingMaskIntoConstraints = NO;
    [scrollView addSubview:scrollViewLabel];

    scrollViewLabel.text = @"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque ac urna ac ipsum sodales fermentum ornare quis tellus. Integer urna dolor, placerat ut pharetra sit amet, mattis a eros. Maecenas dapibus accumsan felis eget faucibus. Nulla rhoncus gravida neque, sed suscipit ex tempor quis. In sagittis sed enim ut posuere. Donec varius euismod rutrum. Pellentesque mauris sem, mollis id odio eu, maximus interdum elit. Mauris pharetra magna ut tortor lobortis sollicitudin. Cras volutpat porta facilisis. Praesent lacinia mi at volutpat accumsan. Sed eu cursus metus. Donec a convallis nunc. Curabitur tempus accumsan lacus vitae luctus. Sed non quam non leo condimentum congue. Nam dui ipsum, elementum in congue id, mollis ac mauris. Morbi finibus turpis quam, ut venenatis magna malesuada ac. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Aliquam erat volutpat. Curabitur nulla mi, aliquam faucibus blandit et, maximus eu libero. Duis semper, est posuere egestas interdum, quam nibh convallis odio, efficitur tempor purus arcu quis justo. Donec euismod feugiat urna in viverra. Sed vel tristique massa. Morbi in consequat sem. Nunc placerat lacus a mauris tempus porttitor. Fusce sed iaculis tortor, nec luctus ligula. Donec euismod metus mauris. Mauris sit amet euismod sapien. Praesent lobortis interdum ligula consequat viverra. Quisque et tortor mattis, congue dolor a, sagittis ligula. Phasellus in lacinia magna. Fusce vel placerat nisi. Maecenas egestas mattis lorem, vel tincidunt mauris eleifend et. In eu pulvinar nibh. Suspendisse ac suscipit orci. Suspendisse at lectus vel purus hendrerit lacinia at posuere sapien. Nunc auctor nisi eget nunc suscipit auctor. Donec fringilla odio lectus, quis porttitor nisl fermentum eget. Nam nunc purus, lobortis id sem porta, accumsan egestas quam. Integer blandit feugiat nunc ac scelerisque. Pellentesque vehicula, massa eget mollis aliquam, felis nulla posuere elit, at gravida elit diam id ligula. Suspendisse pharetra velit sed lacus scelerisque viverra. Maecenas volutpat non metus a interdum. In vitae vestibulum enim. Proin vitae libero non odio finibus pulvinar. In condimentum, sapien ac vehicula lobortis, dolor magna iaculis ex, in consectetur turpis orci eget justo. Suspendisse in lobortis justo, bibendum finibus lorem. Suspendisse ullamcorper diam eu elit sollicitudin, at tempus massa dignissim. In a ante rhoncus, porttitor tortor fermentum, molestie nunc. Phasellus mi dolor, vehicula sed sodales ut, sollicitudin ac ex. Praesent consequat, nunc sed posuere condimentum, risus ex malesuada nulla, sed faucibus velit elit ac risus. Ut venenatis ut nisl in hendrerit.";


    /*** Auto Layout ***/

    NSDictionary *views = NSDictionaryOfVariableBindings(scrollView, scrollViewLabel);

    NSArray *scrollViewLabelConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[scrollViewLabel(scrollView)]" options:0 metrics:nil views:views];
    [scrollView addConstraints:scrollViewLabelConstraints];

    scrollViewLabelConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[scrollViewLabel]|" options:0 metrics:nil views:views];
    [scrollView addConstraints:scrollViewLabelConstraints];

    NSArray *scrollViewConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[scrollView]-|" options:0 metrics:nil views:views];
    [self.view addConstraints:scrollViewConstraints];

    scrollViewConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-[scrollView]-|" options:0 metrics:nil views:views];
    [self.view addConstraints:scrollViewConstraints];

于 2015-03-31T09:52:36.760 に答える
1

完全な実装は次のとおりです。

/*** Init the scrollview and the label ***/

UIScrollView *scrollView= [UIScrollView new];
scrollView.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:scrollView];

UILabel *scrollViewLabel = [[UILabel alloc] init];
scrollViewLabel.numberOfLines = 0;
scrollViewLabel.translatesAutoresizingMaskIntoConstraints = NO;
[scrollView addSubview:scrollViewLabel];

scrollViewLabel.text = @"Bacon ipsum dolor sit amet drumstick meatloaf filet mignon ham t-bone andouille meatball venison cow capicola jerky shankle shoulder ground round. Shank filet mignon pork chop ham hock, short ribs jerky prosciutto tongue porchetta. Biltong kevin strip steak tail jowl jerky boudin drumstick pastrami bresaola. Sirloin tail shoulder salami, hamburger beef doner turducken chuck boudin kielbasa sausage pork loin. Ball tip leberkas fatback, pork chop tail ham ribeye. Bresaola pancetta jerky beef kielbasa frankfurter, corned beef filet mignon ribeye tongue porchetta. Prosciutto short loin sirloin doner brisket jerky swine sausage bresaola chuck. Meatloaf pork chop ribeye bacon jerky turducken, andouille pork belly beef ribs ham hock leberkas. Andouille tri-tip capicola beef t-bone shank tenderloin turducken ball tip salami pork belly shankle. Kielbasa pastrami brisket, kevin spare ribs swine tail beef jerky venison filet mignon. Kevin leberkas ball tip, brisket bresaola chuck meatloaf beef doner drumstick hamburger capicola chicken. Tri-tip biltong drumstick pork prosciutto strip steak pastrami brisket shank hamburger flank tail cow. Pastrami beef ribs ribeye boudin spare ribs pork loin. Meatloaf tail pork belly strip steak doner. T-bone meatball pastrami, pork strip steak salami tail beef boudin leberkas. Venison t-bone fatback, pig brisket pork loin landjaeger turkey tri-tip biltong. Drumstick tri-tip hamburger boudin meatball pork pork chop short ribs chuck doner t-bone bacon frankfurter porchetta beef. Turkey cow meatball andouille pancetta, flank strip steak ham hock. Frankfurter corned beef rump turducken brisket, jerky short loin flank tri-tip ball tip ham hock swine spare ribs.";


/*** Auto Layout ***/

NSDictionary *views = NSDictionaryOfVariableBindings(scrollView, scrollViewLabel);

NSArray *scrollViewLabelConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[scrollViewLabel(scrollView)]" options:0 metrics:nil views:views];
[scrollView addConstraints:scrollViewLabelConstraints];

scrollViewLabelConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[scrollViewLabel]|" options:0 metrics:nil views:views];
[scrollView addConstraints:scrollViewLabelConstraints];

NSArray *scrollViewConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[scrollView]-|" options:0 metrics:nil views:views];
[self.view addConstraints:scrollViewConstraints];

scrollViewConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-[scrollView]-|" options:0 metrics:nil views:views];
[self.view addConstraints:scrollViewConstraints];

詳細な説明については、次のとおりです。

https://arielelkin.github.io/articles/uilabel-plus-uiscrollview-plus-autolayout

于 2016-06-14T13:12:14.077 に答える
1

同じ問題がありました。Apple にはバグがあるようです。そのため、複数行のテキストを正しくレイアウトするには 2 パスのアプローチが必要であり、すべてプロパティ preferredMaxLayoutWidth に依存しています。

これら2つのメソッドをScrollViewControllerに追加することになりました。

- (void)viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];
    [self performSelectorOnMainThread:@selector(adjustScrollContentSizeOnMainThread) withObject:nil    waitUntilDone:NO];
}

- (void)adjustScrollContentSizeOnMainThread
{
    self.myLabel.preferredMaxLayoutWidth = self.myLabel.bounds.size.width;
}

この回答に基づいてソリューションを作成しました：https://stackoverflow.com/a/13616052/2828256

于 2014-01-15T07:57:27.320 に答える