UIScrollView 不会自动调整大小 [英] UIScrollView will not resize with autosizing

问题描述

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 大小检查器中的自动调整大小功能来自动调整我的视图大小.

Everything I've read on supporting UIScrollView on iOS 5+ states that I should be able to use the autosizing feature within Xcode's Size Inspector to auto resize my views.

使用 Storyboards，我有一个 TabBarViewController，其中一个选项卡有一个 UIScrollView 和一个页面控件.

Using Storyboards, I have a TabBarViewController of which one of my tabs has a UIScrollView and a Page Control.

在幕后，我以编程方式设置了对 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，我还是会这样做).

Behind the scenes I have setup programmatically a handling of the pages in a UIView (I don't know if it's necessary to post the code, but I'm going to do it anyway for clarity).

当从 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 英寸屏幕时可以看到 UIScrollView 和页面控件.

When switching from the iPhone 3.5inch to the iPhone 4inch the auto resize is not working whatsoever. I'd like to have the UIScrollView AND the Page control visible when using the 3.5 inch screen.

我应该注意到 iPad 版本(见下面的代码)在我的子视图中没有正确捕捉.(这可能是一个不同的问题，完全不同).

I should note that the iPad version (see code below) doesn't snap properly in my subview. (That may be a different question, altogether).

4 英寸屏幕

3.5 英寸屏幕

以防万一，这是我的 .m 文件:

Just in case, here's my .m file:

#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

推荐答案

这样使用

或

这样你的问题就解决了

或在您的 .m 文件中编写单行代码

or write single line code in your .m file

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

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