Question

使用Autolayout时，我无法使UIScrollView垂直滚动，我尝试了很多建议。我已经阅读了Apple的technical note，但即便如此，这似乎与我的纯自动布局方法无关。

这是我的简单代码，其中我添加了两个UIView块1＆amp; 2在容器视图中。容器视图本身是UIScrollView的唯一子项，正如许多在线参考文献所建议的那样。我将第1和第2块的高度设置为每个800点，但滚动视图不会滚动。

    - (void)viewDidLoad {
        [super viewDidLoad];


        // Test UIScrollView with Autolayout, scrolling should word

        UIView *mainView = self.view;

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

        UIView* contentView = [UIView new];
        contentView.translatesAutoresizingMaskIntoConstraints = NO;
        contentView.backgroundColor = [UIColor greenColor];
        [scrollView addSubview:contentView];

        UIView* block1 = [[UIView alloc] init];
        block1.translatesAutoresizingMaskIntoConstraints = NO;
        [block1 setBackgroundColor:[UIColor blackColor]];
        [contentView addSubview:block1];

        UIView* block2 = [[UIView alloc] init];
        block2.translatesAutoresizingMaskIntoConstraints = NO;
        [block2 setBackgroundColor:[UIColor blackColor]];
        [contentView addSubview:block2];


        NSDictionary* viewDict = NSDictionaryOfVariableBindings(mainView,scrollView, contentView, block1, block2);

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


        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[contentView(==mainView)]|" options:0 metrics:0 views:viewDict]];
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[contentView(==mainView)]|" options:0 metrics:0 views:viewDict]];


        [contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[block1(==300)]" options:0 metrics:0 views:viewDict]];
        [contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[block1(==800)]" options:0 metrics:0 views:viewDict]];

        [contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[block2(==300)]" options:0 metrics:0 views:viewDict]];
        [contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-810-[block2(==800)]" options:0 metrics:0 views:viewDict]];

}

Answer 1

查看您的代码，您的内容视图的大小似乎与UIView的大小相同。

e.g。：IF设备屏幕高度为568，那么您的内容视图大小将为568，并且您将 block2 设置为y位置= 180。

您的代码：

    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[contentView(==mainView)]|" options:0 metrics:0 views:viewDict]];

更改：

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[contentView(2000)]|” options:0 metrics:0 views:viewDict]];

希望它能解决您的问题，如果有任何进一步的问题请告诉我。

Answer 2

如果你想做的就是让滚动视图与自动布局一起使用，你可以试试这个。 http://natashatherobot.com/ios-autolayout-scrollview/

Answer 3

在代码中执行以下更改

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[contentView]|" options:0 metrics:0 views:viewDict]];

[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-810-[block2(==800)]|" options:0 metrics:0 views:viewDict]];

希望这有帮助

UIScrollView不会使用AutoLayout滚动

3 个答案: