如何以编程方式从头到尾缓慢滚动 UIScrollView [英] How can I programmatically scroll UIScrollView from start to end slowly

问题描述

我有一个显示大约 10 张图像的水平 UIScrollview.我知道我们必须使用 scrollRectToVisible 方法以编程方式移动滚动视图.但我正在寻找的是从滚动视图的开始到结束缓慢滚动滚动视图(1 秒内 5 个像素).

I've a horizontal UIScrollview that shows around 10 images. I know that we've to use scrollRectToVisible method to move the scrollview programmatically. But what I am looking for is to scroll the scroll view slowly (5 pixels in 1 second) from start to end of the scroll view.

我看过一些页面，但我不明白如何在我的代码中集成以下代码:

I have seen some pages, but I didn't understand how to integrate following code in my code:

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDelegate:self];
[UIView setAnimationDuration:(abs(rMid-pMid)*0.3)];
scrollMid.contentOffset = CGPointMake(rMid*320, 0);
[UIView commitAnimations];

推荐答案

你可以像

- (void) viewDidLoad
{       
    if (scrollingTimer == nil)
    {
        scrollingTimer = [NSTimer scheduledTimerWithTimeInterval:(0.06)
                         target:self selector:@selector(autoscrollTimerFired) userInfo:nil repeats:YES];        
    }
}

- (void) autoscrollTimerFired
{
    if (scrollPoint.y == 583) // at where you want to stop scroll
    {
        [scrollingTimer invalidate];
        scrollingTimer = nil;
    }
    scrollPoint = CGPointMake(scrollPoint.x, scrollPoint.y + 1);
    [self.scrollView setContentOffset:scrollPoint animated:NO];
}

希望对你有帮助...

这篇关于如何以编程方式从头到尾缓慢滚动 UIScrollView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！