Question

我正在寻找一个只展示iPhone垂直滚动的例子。

Apple提供的滚动示例允许滑动图像右。
1. Example Link
2. Example Link
我想让我的图片像Instagram App一样滚动top to bottom。
我研究了它并发现了许多例子，但它们都显示出来水平滚动。
1. Example
2. Example
3. Example

有谁知道怎么做？

如果您向我发送教程链接，我将不胜感激。

Answer 1

您好我用Apple代码解决了您的问题，

只需用

更改功能

- (void)layoutScrollImages
{
    UIImageView *view = nil;
    NSArray *subviews = [scrollView1 subviews];

    // reposition all image subviews in a horizontal serial fashion
    CGFloat curXLoc = 0;
    for (view in subviews)
    {
        if ([view isKindOfClass:[UIImageView class]] && view.tag > 0)
        {
            CGRect frame = view.frame;
            frame.origin = CGPointMake(0,curXLoc);
            view.frame = frame;

            curXLoc += (kScrollObjHeight);
        }
    }

    // set the content size so it can be scrollable
    [scrollView1 setContentSize:CGSizeMake(([scrollView1 bounds].size.width),kNumImages * kScrollObjHeight)];
}

或者如果你想要样品，那么我会给你

Answer 2

为了您的目的，请参阅您的链接：

http://idevzilla.com/2010/09/16/uiscrollview-a-really-simple-tutorial/

有一个代码：

scroll.contentSize = CGSizeMake(self.view.frame.size.width * numberOfViews, self.view.frame.size.height);

对于水平滚动，您需要将width contentSize属性设置为高于滚动视图f rame width的值。同样，对于垂直滚动，您需要将height contentSize属性设置为高于滚动视图frame height的值。

Reference

在上面的代码中，它可以像：

scroll.contentSize = CGSizeMake(self.view.frame.size.width, numberOfViews * self.view.frame.size.height);

Answer 3

您可以使用以下代码从上到下滚动图像，反之亦然。!!

- (void)viewDidLoad
{
//....
UISwipeGestureRecognizer *recognizer;
//for scrolling up
    recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(SwipeUp)]; // calling method SwipeUp
    [recognizer setDirection:(UISwipeGestureRecognizerDirectionUp)];
    [[self view] addGestureRecognizer:recognizer];


  //for scrolling down  
    UISwipeGestureRecognizer *recognizer1;
    recognizer1 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(SwipeDown)]; //calling method SwipeDown
    [recognizer1 setDirection:(UISwipeGestureRecognizerDirectionDown)];
    [[self view] addGestureRecognizer:recognizer1];

}

//初始化并合成IBOutlet UIImageView *bgImage;

-(IBAction)SwipeUp
{


        [bgImage setImage:[UIImage imageNamed:@"yourImage1"] ];

          bgImage.opaque=YES;
    [self.view addSubview:bgImage];
}


-(IBAction)SwipeDown
{


        [bgImage setImage:[UIImage imageNamed:@"yourImage2"] ];

        bgImage.opaque=YES;
    [self.view addSubview:bgImage];
}

Answer 4

我不知道我是否理解你想要完成什么，但基本上你可以使用setContentOffset设置scrollView的位置。

CGPoint bottomOffset = CGPointMake(0, scrollView.contentSize.height - self.scrollView.bounds.size.height);
[scrollView setContentOffset:bottomOffset animated:YES];

Answer 5

有几种方法可以做到这一点，例如：

将UITableView与自定义单元格一起使用
添加UIScrollingView＆amp;添加内容/图像＆amp;增加根据数组中对象的数量，scrollview的高度。

以下是为图片创建2 * 2网格的代码段：

//Over here adding the image names into the Array
NSMutableArray *imageArray=[[NSMutableArray alloc]init];
    [Arr addObject:[UIImage imageNamed:@"image_1.png"]];
    [Arr addObject:[UIImage imageNamed:@"image_2.png"]];
    [Arr addObject:[UIImage imageNamed:@"image_3.png"]];
    [Arr addObject:[UIImage imageNamed:@"image_4.png"]];
    [Arr addObject:[UIImage imageNamed:@"image_5.png"]];

//初始化ScrollView＆amp;设置框架：

scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0,320, 460)];
[scrollView setBackgroundColor:[UIColor clearColor]];
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.showsVerticalScrollIndicator = NO;
int row = 0;
int column = 0;
for(int i = 0; i < imageArray.count; i++) {

    UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.backgroundColor=[UIColor clearColor];
    button.frame = CGRectMake(column*160+0,row*210+10, 160, 190);
    [button setImage:[imageArray objectAtIndex:i] forState:UIControlStateNormal];
    [button setBackgroundColor:[UIColor clearColor]];
    [button addTarget:self action:@selector(chooseCustomImageTapped:) forControlEvents:UIControlEventTouchUpInside];
    button.tag = i; 
    [view1 addSubview:button];

    if (column == 1) {
        column = 0;
        row++;
    } else {
        column++;
    }

}

[scrollView setContentSize:CGSizeMake(320, (row+1) * 210)];

[self.view addSubview:view1];

//这是用于点击的方法：

- (IBAction)chooseCustomImageTapped:(id)sender
{

}

现在，一旦scrollView准备好进行垂直滚动，您就可以相应地进行自定义。我希望这对你有用。

使用UIScrollView从上到下滚动

5 个答案: