Question

我在UIScrollView中有7个UIButtons。前3个UIButton可以隐藏或可见，具体取决于代码中的if语句。意思是显示3个UIButton有8种可能性。我遇到的问题是让UIScrollView调整其内容大小，以便在其中没有“空”的空格。例如，如果中间的UIButton被隐藏但是它上面和下面的那些是可见的，那么剩下一个空的空间。是否有任何方法可以使所有按钮在滚动视图中完全匹配，而没有任何间隙？

我已经尝试过这段代码，但它不起作用：

if([[facilities objectAtIndex:0]intValue] == 1) {

        facilitiesButton.hidden = NO;



    }

    if([[ListingsEnabled objectAtIndex:0]intValue]==1) {

        ListingsBtn.hidden = NO;
    } 

    if([[OffersEnabled objectAtIndex:0]intValue]==1) {

        OffersBtn.hidden = NO;
    }

    CGFloat scrollViewHeight = 0.0f;
    self.DetailScrollView.showsHorizontalScrollIndicator = NO;       
    self.DetailScrollView.showsVerticalScrollIndicator = NO;
    for (UIView* view in self.DetailScrollView.subviews)
    {
        if (!view.hidden)
        {
            CGFloat y = view.frame.origin.y;
            CGFloat h = view.frame.size.height;
            if (y + h > scrollViewHeight)
            {
                scrollViewHeight = h + y;
            }
        }
    }
    self.DetailScrollView.showsHorizontalScrollIndicator = YES;
    self.DetailScrollView.showsVerticalScrollIndicator = YES;

    [self.DetailScrollView setContentSize:(CGSizeMake(self.DetailScrollView.frame.size.width, scrollViewHeight))];

Answer 1

正如@Andy评论的那样，您需要定位实际按钮，而不仅仅是更改滚动视图大小。桌面视图可能确实是要走的路，但对于可能有点过分的7个按钮。这是一个片段，它将遍历按钮并根据可见性更新其位置。我省略了滚动视图，因为它似乎没有必要，但如果你需要它们在滚动视图中将更新我可以编辑代码，请告诉我。

/////////////////////
///// USES ARC //////
/////////////////////

- (void)viewDidLoad
{
    [super viewDidLoad];

    allButtons = [NSMutableArray array];

    // Create 7 buttons and randomly hide some
    for (int i = 0; i < 7; i++)
    {
        UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
        button.frame = CGRectMake(0, 0, 100, 50);
        [button setTitle:[NSString stringWithFormat:@"Button %i", i+1] forState:UIControlStateNormal];
        [button addTarget:self action:@selector(randomizeButtons:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:button];

        button.hidden = arc4random_uniform(2)-1 > 0;

        [allButtons addObject:button];
    }

    [self updateButtonLayout];
}

-(void)updateButtonLayout
{
    // position buttons based on visiblity

    CGRect lastButtonFrame = CGRectMake(0, 0, 0, 0);
    int verticalPadding = 10;

    for(UIButton *btn in allButtons)
    {
        if(!btn.hidden)
        {
            btn.frame = CGRectMake(lastButtonFrame.origin.x, lastButtonFrame.origin.y+lastButtonFrame.size.height+verticalPadding, btn.frame.size.width, btn.frame.size.height);

            lastButtonFrame = btn.frame;
        }
    }
}

-(void)randomizeButtons:(UIButton *)btn
{
    // Randomize the visiblity of the buttons and update the interface

    for(UIButton *btn in allButtons)
    {
        btn.hidden = arc4random_uniform(2)-1 > 0;
    }

    [self updateButtonLayout];
}

iPhone SDK：UIScrollView中的UIButtons - 调整滚动视图大小以适应所有非隐藏按钮

1 个答案: