UIScrollView 不会通过自动调整大小来调整大小

我读到的关于在 iOS 5+ 上支持 UIScrollView 的所有内容都表明我应该能够使用 Xcode 的 Size Inspector 中的自动调整大小功能来自动调整视图的大小。

使用故事板，我有一个 TabBarViewController，其中我的选项卡之一有一个 UIScrollView 和一个页面控件。

在幕后，我以编程方式设置了 UIView 中页面的处理（我不知道是否有必要发布代码，但为了清楚起见，我无论如何都会这样做）。

从 iPhone 3.5 英寸切换到 iPhone 4 英寸时，自动调整大小不起作用。我希望在使用 3.5 英寸屏幕时使 UIScrollView 和 Page 控件可见。

我应该注意到，iPad 版本（参见下面的代码）在我的子视图中无法正确对齐。 （这可能是一个不同的问题）。

4 Inch Screen

3.5 Inch Screen

以防万一，这是我的 .m 文件：

#import "TutorialViewController.h"

@interface TutorialViewController ()
@property (nonatomic, strong) NSArray *pageImages;
@property (nonatomic, strong) NSMutableArray *pageViews;

- (void)loadVisiblePages;
- (void)loadPage:(NSInteger)page;
- (void)purgePage:(NSInteger)page;

#ifdef UI_USER_INTERFACE_IDIOM
#define IS_IPAD() (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#else
#define IS_IPAD() (false)
#endif


@end

@implementation TutorialViewController

@synthesize scrollView = _scrollView;
@synthesize pageControl = _pageControl;

@synthesize pageImages = _pageImages;
@synthesize pageViews = _pageViews;



- (void)loadPage:(NSInteger)page {
    if (page < 0 || page >= self.pageImages.count) {
        // If it's outside the range of what you have to display, then do nothing
        return;
    }

    // 1
    UIView *pageView = [self.pageViews objectAtIndex:page];
    if ((NSNull*)pageView == [NSNull null]) {
        // 2
        CGRect frame = self.scrollView.bounds;
        frame.origin.x = frame.size.width * page;
        frame.origin.y = 0.0f;

        // 3
        UIImageView *newPageView = [[UIImageView alloc] initWithImage:[self.pageImages objectAtIndex:page]];
        newPageView.contentMode = UIViewContentModeScaleAspectFill;
        newPageView.frame = frame;
        [self.scrollView addSubview:newPageView];
        // 4
        [self.pageViews replaceObjectAtIndex:page withObject:newPageView];
    }
}

- (void)purgePage:(NSInteger)page {
    if (page < 0 || page >= self.pageImages.count) {
        // If it's outside the range of what you have to display, then do nothing
        return;
    }

    // Remove a page from the scroll view and reset the container array
    UIView *pageView = [self.pageViews objectAtIndex:page];
    if ((NSNull*)pageView != [NSNull null]) {
        [pageView removeFromSuperview];
        [self.pageViews replaceObjectAtIndex:page withObject:[NSNull null]];
    }
}

- (void)loadVisiblePages {
    // First, determine which page is currently visible
    CGFloat pageWidth = self.scrollView.frame.size.width;
    NSInteger page = (NSInteger)floor((self.scrollView.contentOffset.x * 2.0f + pageWidth) / (pageWidth * 2.0f));

    // Update the page control
    self.pageControl.currentPage = page;

    // Work out which pages you want to load
    NSInteger firstPage = page - 1;
    NSInteger lastPage = page + 1;


    // Purge anything before the first page
    for (NSInteger i=0; i<firstPage; i++) {
        [self purgePage:i];
    }

    // Load pages in our range
    for (NSInteger i=firstPage; i<=lastPage; i++) {
        [self loadPage:i];
    }

    // Purge anything after the last page
    for (NSInteger i=lastPage+1; i<self.pageImages.count; i++) {
        [self purgePage:i];
    }

}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    // Load the pages that are now on screen
    [self loadVisiblePages];
    // NSLog(@"Scroll View Did Scroll");
}


- (void)viewDidLoad {
    [super viewDidLoad];

    // Step 1
    if (IS_IPAD())
    {
        self.pageImages = [NSArray arrayWithObjects:
                           [UIImage imageNamed:@"1536x2048 tutorial_1.png"],
                           [UIImage imageNamed:@"1536x2048 tutorial_2.png"],
                           [UIImage imageNamed:@"1536x2048 tutorial_3.png"],
                           [UIImage imageNamed:@"1536x2048 tutorial_4.png"],
                           nil];
    }
    else
    {
        self.pageImages = [NSArray arrayWithObjects:
                           [UIImage imageNamed:@"640x960 tutorial_1.png"],
                           [UIImage imageNamed:@"640x960 tutorial_2.png"],
                           [UIImage imageNamed:@"640x960 tutorial_3.png"],
                           [UIImage imageNamed:@"640x960 tutorial_4.png"],
                           nil];
    }


    NSInteger pageCount = self.pageImages.count;

    // Step 2
    self.pageControl.currentPage = 0;
    self.pageControl.numberOfPages = pageCount;

    // Step 3
    self.pageViews = [[NSMutableArray alloc] init];
    for (NSInteger i = 0; i < pageCount; ++i) {
        [self.pageViews addObject:[NSNull null]];
    }
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    // Step 4
    // 3.5in height = 388
    // 4in height = 476
    CGSize pagesScrollViewSize = self.scrollView.frame.size;
    self.scrollView.contentSize = CGSizeMake(pagesScrollViewSize.width * self.pageImages.count, pagesScrollViewSize.height);

    // Step 5
    [self loadVisiblePages];
}

@end

像这样使用

or

这样你的问题就会解决

或者在 .m 文件中编写单行代码

 scrollview.frame = CGRectMake(x, y, 320, self.view.bounds.size.height);