UIScrollView will not resize with autosizing

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.

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

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).

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.

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 Inch Screen

3.5 Inch Screen

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

回答1:

use like this

like this your problem will solve

or write single line code in your .m file

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

回答2:

Just check if the view in which you have added the scroll view has enabled AutoResizeSubviews. If not it will not adjust the scrollview according to the screen size.

Secondly, adjust your scroll view according to 3.5 inch screen and AutoResizing will adjust it for 4 inch screen. Don't do it vice-versa.

For page control, Do it this way. It will always be at the bottom of your view.

回答3:

select yourappname.pch in the Supporting Files folder and add this line right before the last #endif at the bottom of the file to Check, for device....

#define IS_IPHONE5 (([[UIScreen mainScreen] bounds].size.height-568)?NO:YES)

then write this in your ViewWillAppear()

    if (IS_IPHONE5)
    {
        scrollView.contentSize = CGSizeMake(width,height );
    }