Question

我是iphone的新手，我使用的是水平滚动视图，这些都是水平滚动的但我希望这些水平滚动上一个和下一个按钮动作。请尽快帮助我。

感谢：）

Answer 1

以下是为我工作的步骤

<。>在.h文件中编写以下代码。

int scrollMove; 
UIScrollView *aScrView;

-(IBAction)nextBtnAction:(id)sender;
-(IBAction)previousBtnAction:(id)sender;

<。>文件中的

- (void)viewDidLoad
{
[super viewDidLoad];

scrollMove=50;

aScrView=[[UIScrollView alloc]init];
aScrView.frame=CGRectMake(25,50, 270, 50);
aScrView.delegate=self;
aScrView.contentSize=CGSizeMake(1200, 0);

[self.view addSubview:aScrView];


// Do any additional setup after loading the view from its nib.
}


-(IBAction)nextBtnAction:(id)sender{

 float coordinate = 2.0f;
 //scrollMove=50;
 [aScrView setContentOffset:CGPointMake(scrollMove * coordinate, 0) animated:YES];
 scrollMove=scrollMove+50;



 }
-(IBAction)previousBtnAction:(id)sender{
float coordinate = 1.0f;


[aScrView setContentOffset:CGPointMake(scrollMove * coordinate, 0) animated:YES];
scrollMove=scrollMove-50;
}

希望这可以帮助你!!!

Answer 2

如果要继续滚动视图的下一个可见内容，请使用此选项：

（把这个放在下一个按钮方法中）

float coordinate = 2.0f;
[nodeScrollView setContentOffset:CGPointMake(460 * coordinate, 0) animated:YES];

继续前一个可见内容视图：

float coordinate = 1.0f;

[nodeScrollView setContentOffset:CGPointMake(460 * coordinate, 0) animated:YES];

（把这个放在上一个按钮方法中）

* *您需要使用坐标

进行一些数学计算

Answer 3

CGRect frame = scrollView.frame;
frame.origin.x = frame.size.width * pageNumberYouWantToGoTo;
frame.origin.y = 0;
[scrollView scrollRectToVisible:frame animated:YES];

Answer 4

- (void)viewDidLoad
{
    x=0;
    y=320;
}

- (IBAction)next:(id)sender 

{
    y=320;
    [scrl_Knot setContentOffset:CGPointMake(x+320,0) animated:YES];
    x+=320;

}

- (IBAction)pre:(id)sender 

{

    x=0;
    [scrl_Knot setContentOffset:CGPointMake(y,0) animated:YES];
    y-=320;

}

Answer 5

- (IBAction)pre:(id)sender
{
    btnNext.enabled = TRUE;
    imageID--;
    [scrl_venuelist setContentOffset:CGPointMake(imageID*273, 0) animated:YES];
    pagecontrol.currentPage=imageID;
    if(imageID <= 0)
    {
        btnPrevious.enabled = FALSE;
    }
}
- (IBAction)next:(id)sender
{
    btnPrevious.enabled = TRUE;
    imageID++;
    [scrl_venuelist setContentOffset:CGPointMake(imageID*273, 0) animated:YES];
    pagecontrol.currentPage=imageID;
    if(imageID >= imageArr.count-1)
    {
        btnNext.enabled = FALSE;
    }
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView; 
{
    imageID = scrollView.contentOffset.x / scrollView.frame.size.width; 
    pagecontrol.currentPage=imageID;

    if(imageID <= 0)
    {
        btnPrevious.enabled = FALSE;
        imageID = 0;
    }
    else
    {
        btnPrevious.enabled = TRUE;
    }

    if(imageID >= imageArr.count-1)
    {
        btnNext.enabled = FALSE;
        imageID = imageArr.count-1;
    }
    else
    {
        btnNext.enabled = TRUE; 
    }
}

- (void)viewDidLoad
{
    scrl_venuelist.delegate=self;
    scrl_venuelist.contentSize =CGSizeMake(273 * [imageArr count], 137);
    if(imageID == 0)
    {
        btnPrevious.enabled = FALSE;
        if(imageID == imageArr.count-1)
        {
            btnNext.enabled = FALSE;
        }
    }
    else if(imageID == imageArr.count-1)
    {
        btnNext.enabled = FALSE;
    }
    else if(imageID > imageArr.count-1)
    {
        imageID = [imageArr count]-1;
    }
    scrl_venuelist.pagingEnabled=YES;
    pagecontrol.numberOfPages=[imageArr count];
    pagecontrol.currentPage=0;
}

Answer 6

如果有人正在寻找使用Xamarin的C＃方法

    public int CurrentIndex
    {
        get => (int)Math.Round(this.scrollView.ContentOffset.X / this.scrollView.Frame.Width);
        set => this.scrollView.ScrollRectToVisible(new CGRect(new CGPoint(this.scrollView.Frame.Size.Width * value, 0), this.scrollView.Frame.Size), true);
    }

此getter和Setter应该会为您提供当前页面，并让您滚动到指定页面

按钮操作只需将当前索引更新为新值即可，当前索引可能为+ 1 / -1。

UIScrollView使用下一个和上一个按钮操作

6 个答案: