Question

我没有找到创建内部某个视图的滚动视图的方法，我创建了一个带有一些元素和一些约束的xib，我创建了一个带有scrollview的控制器 - ＆gt; scrollviewcontent-＆gt; {v1，v2，v3我的v1，v2，v3似乎有约束。这是我的代码，我犯了错误？

- (void) viewWillAppear:(BOOL)animated {

    [super viewWillAppear:YES];

    if (isFirst)
    {
        [self initViews];
        [self initConstraints];
        [self initTutorial];

        isFirst = NO;
    }
}


-(void) initViews
{
    _scrollView = [[UIScrollView alloc] init];
    [_scrollView setPagingEnabled:YES];
    [_scrollView setShowsHorizontalScrollIndicator:NO];
    [_scrollView setBackgroundColor:[UIColor clearColor]];
    [_scrollView setDelegate:self];


    // ------------------------------------------------------------------
    // This content view will be the only child view of scrollview
    // ------------------------------------------------------------------
    _scrollViewContent = [[UIView alloc] init];
    [_scrollViewContent setBackgroundColor:[UIColor clearColor]];


    // add content view to scrollview now
    [_scrollView addSubview:_scrollViewContent];

    // add scrollview to main view
    [self.view addSubview:self.scrollView];

}
-(void) initConstraints
{
    _scrollView.translatesAutoresizingMaskIntoConstraints = NO;
    _scrollViewContent.translatesAutoresizingMaskIntoConstraints = NO;

    id views = @{
                 @"_scrollView": _scrollView,
                 @"_scrollViewContent": _scrollViewContent
                 };

    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_scrollView]|" options:0 metrics:nil views:views]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[_scrollView]|" options:0 metrics:nil views:views]];

    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_scrollViewContent]|" options:0 metrics:nil views:views]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[_scrollViewContent]|" options:0 metrics:nil views:views]];
}

- (void) initTutorial {

    [self.view layoutIfNeeded];

    int i = 0;
    for (V10Page *page in pagineTutorial)
    {
        V10Widget *widget = [page.page objectForKey:@"description"];

        TutorialPage *tutorial = [[TutorialPage alloc] initWithFrame:CGRectMake(i * [Utils getScreenSize].width, 0,[Utils getScreenSize].width, _scrollView.frame.size.height)
                                                             andText:[widget getValueForDefaultLanguage]
                                                            andImage:nil];
        [_scrollViewContent addSubview:tutorial];
        [self.view layoutIfNeeded];


        i++;
    }
}

- (void) viewDidLayoutSubviews {

    [super viewDidLayoutSubviews];

    if (pagineTutorial.count > 0)
    {
        [_scrollViewContent setFrame:CGRectMake(0, 0, _scrollView.frame.size.width * pagineTutorial.count, _scrollView.frame.size.height)];
        [_scrollView setContentSize:_scrollViewContent.frame.size];
    }

    [self.view layoutIfNeeded];

}

Answer 1

许多iOS开发人员在使用AutoLayout UIScrollView时遇到一个常见问题。这通常不是那么困难，只需记住几件事。

将滚动视图添加到主UIView并提供与UIView相关的约束。
在UIView内添加内容视图（ScrollView），并给出顶部，底部，左侧和右侧约束w.r.t ScrollView。还要添加相等宽度和相等高度约束w.r.t main UIView。
如果需要垂直滚动，请将等高约束的优先级设置为低。
现在，您可以在内容视图中添加任何内容，并添加约束w.r.t ContentView。

您可以从UIScrollView with AutoLayout

自动布局scrollview最佳方法

1 个答案: