从右到左语言的 UIScrollView 方向 RTL [英] UIScrollView Direction RTL for Right to Left Languages

问题描述

我们能否改变 UIScrollView 的行为，让它以反向模式滚动 RTL 内容.

Can we change the behavior of UIScrollView that it scrolls RTL content in it's reverse mode.

推荐答案

count = 6;

[self.scrollView setFrame:CGRectMake(scrollView.frame.origin.x, scrollView.frame.origin.y, 320, 480)];

[pageControl setNumberOfPages:count];

self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * count, self.scrollView.frame.size.height);

for(int i=count-1; i>=0; i--) { //start adding content in reverse mode
    CGRect frame;
    frame.origin.x = self.scrollView.frame.size.width * (count - i - 1); //ar
    frame.origin.y = 0;
    frame.size = self.scrollView.frame.size;

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:frame];
    [imageView setImage:[UIImage imageNamed:[NSString stringWithFormat:@"%i.png", i]]];

    [self.scrollView addSubview:imageView];
}

//scroll to the last frame as it's the first page for RTL languages
CGRect frame;
frame.origin.x = scrollView.frame.size.width * (count - 1);
frame.origin.y = 0;
frame.size = scrollView.frame.size;
[self.scrollView scrollRectToVisible:frame animated:NO];

页面控件还需要将最后一个点指示为第一个点(或第一页)

The page control also needs to be indicate the last dot as the first dot (or first page)

- (void)scrollViewDidScroll:(UIScrollView *)sender {
// Update the page when more than 50% of the previous/next page is visible
CGFloat pageWidth = self.scrollView.frame.size.width;
int page = floor((self.scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
self.pageControl.currentPage = (page % count);
}

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