iphone - 调整 UIView 的大小

Question

我有两个 UIView s，比如说 containerView和 testView .说testView的宽度大于 containerView .在这种情况下，当我添加 testView作为 containerView 的 subview ，我的问题来了。 testView 的框架超出 containerView 的范围.这是我的代码 -

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(60, 154, 200, 200)];
    containerView.backgroundColor = [UIColor grayColor];
    containerView.clipsToBounds = NO;

    UIView *testView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 260, 100)];
    testView.backgroundColor = [UIColor yellowColor];
    testView.layer.borderWidth = 3;
    testView.layer.borderColor = [[UIColor blackColor] CGColor];
    testView.center = CGPointMake(containerView.frame.size.width / 2, containerView.frame.size.height / 2);

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(15, 25, 230, 50)];
    label.text = @"This is a Label to test the size";

    [testView addSubview:label];
    [containerView addSubview:testView];
    [self.view addSubview:containerView];
}

此代码的输出是 -


当containerView.clipsToBounds = YES; ，输出为 -


但我真正需要的是——
(编辑后的图像)

当我添加 testView其宽度/高度大于其父 View - containerView ，testView 的框架(包括 child )应进行调整，使其完全适合其 super View 。

我欢迎你的想法..!

Answer 1

执行此操作的现代方法是创建 View ，向 View 添加约束以建立与包含 View 的关系，然后将该 View 添加为 subview 。

这样你就不会弄乱框架，并且会为你处理旋转调整大小。

编辑添加

这是一些示例代码，可以执行类似于您要求的操作

- (void)viewDidLoad {
    [super viewDidLoad];

    // Create the containing view
    UIView *greyView = [[UIView alloc] initWithFrame:CGRectZero];
    greyView.backgroundColor = [UIColor grayColor];
    greyView.translatesAutoresizingMaskIntoConstraints = NO;

    [self.view addSubview:greyView];

    // Create the label to go into the containing view
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectZero];
    label.translatesAutoresizingMaskIntoConstraints = NO;
    label.text = @"Example Text";

    label.backgroundColor = [UIColor yellowColor];

    [greyView addSubview:label];

    NSDictionary *bindings = NSDictionaryOfVariableBindings(greyView, label);

    // Set the constraints for the greyView relative to it's superview - to cover completely
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[greyView]|" options:NSLayoutFormatDirectionLeadingToTrailing metrics:nil views:bindings]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[greyView]|" options:NSLayoutFormatDirectionLeadingToTrailing metrics:nil views:bindings]];

    // Set the constraints for the label to be pinned equally with padding
    [greyView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-(30)-[label]-(30)-|" options:NSLayoutFormatDirectionLeadingToTrailing metrics:nil views:bindings]];
    [greyView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(30)-[label]-(30)-|" options:NSLayoutFormatDirectionLeadingToTrailing metrics:nil views:bindings]];

}

如果您想看到它的实际效果并自己调整约束，我已经上传了 simple example project你可以使用。