Question

我这样做：

    scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
    [self addSubview:scrollView];

    NSInteger x = scrollView.bounds.origin.x + Padding, y = scrollView.bounds.origin.y + Padding;

    backButton = [[AButtonControl alloc] initWithCaption:@"Back" style:AButtonViewStyleGreen];
    backButton.frame = CGRectMake(x, y, backButton.frame.size.width, backButton.frame.size.height);
    y += backButton.frame.size.height + Spacing;
    [scrollView addSubview:backButton];

    ownerNameTextField = [[AFormTextField alloc] initWithFrame:CGRectMake(x, y, 200, 60) label:@"Guest name"];
    y += ownerNameTextField.frame.size.height + Spacing;
    [scrollView addSubview:ownerNameTextField];

    guestListSelectField = [[AFormSelectField alloc] initWithFrame:CGRectMake(x, y, 200, 60) label:@"Guest list"];
    y += guestListSelectField.frame.size.height + Spacing;
    [scrollView addSubview:guestListSelectField];

    referenceUserSelectField = [[AFormSelectField alloc] initWithFrame:CGRectMake(x, y, 200, 60) label:@"Reference user"];
    y += referenceUserSelectField.frame.size.height;

    [scrollView addSubview:referenceUserSelectField];

    scrollView.contentSize = CGSizeMake(self.bounds.size.width, y + Padding);

它滚动得很好，但视图不像它应该（？）那样反弹。

有什么想法吗？

Answer 1

这里的根本问题是如果你在-layoutSubviews中设置scrollview的frame / bounds，它不会检查你是否将它设置为它已经拥有的帧/边界，这会取消反弹。解决方案是做类似
的事情

CGFrame scrollFrame = [self calculateFrameForScrollView];
if (!CGRectEqualToRect(scrollFrame, self.myScrollView.frame)) 
    self.myScrollView.frame = scrollFrame;

发现于：UIScrollView and its subclasses won't bounce if nested in custom UIView

为什么UIScrollView没有弹跳？

1 个答案: