Brauchen Sie Hilfe bei der betätigung ein Blick in UIScrollView / UIPageControl auf storyboard

Ich versuche, umzusetzen UIScrollView mit UIPageControl auf storyboard anzeigen mehrerer Ansichten. Alle Beispiele, tutorials oder Informationen die ich fand sind mit xib-und storyboard nicht. Ich habe versucht, die Anpassung, die Apple-sample-code, aber ich bin etwas fehlt. Wie Sie sehen können, ist es ganz einfach.

Aber entweder bekomme ich eine Fehlermeldung im ContentController.m -[NSNull view]: unrecognized selector geschickt Instanz 0x129acd8 wenn ich testen if (controller.Blick.superview == null) wo Schiebe ich die Ansicht (siehe unten, nach der ersten Hälfte des Codes).

Oder nur das UIScrollView und UIPageControl arbeiten und ich bin nicht in der Lage, schieben Sie die Ansicht in der UIScrollView:

Ich weiß, es ist eine einfache Frage, aber ich verbrachte viele Stunden auf diesem und jede Hilfe wird geschätzt.

Ich poste den vollständigen code, so kann es helfen, wenn sich jemand gelöst wie eine Art von tutorial. Ich werde korrigieren Sie den code, wenn erforderlich, nach Beiträge.

Vielen Dank im Voraus

AppDelegate.h

//Nothing special as I don't want to manage it through application delegate
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@end

AppDelegate.m

//Nothing special as I don't want to manage it through application delegate
#import "AppDelegate.h"

@implementation AppDelegate

@synthesize window = _window;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application { }

- (void)applicationDidEnterBackground:(UIApplication *)application { }

- (void)applicationWillEnterForeground:(UIApplication *)application { }

- (void)applicationDidBecomeActive:(UIApplication *)application { }

- (void)applicationWillTerminate:(UIApplication *)application { }

@end

ContentController.h

//From Apple's PageControl sample code
#import <UIKit/UIKit.h>

@interface ContentController : UIViewController <UIScrollViewDelegate> {
    UIScrollView *scrollView;
    UIPageControl *pageControl;
    NSMutableArray *viewControllers;
    BOOL pageControlUsed;
}

@property (nonatomic, retain) IBOutlet UIScrollView *scrollView;
@property (nonatomic, retain) IBOutlet UIPageControl *pageControl;
@property (nonatomic, retain) NSMutableArray *viewControllers;

- (IBAction)changePage:(id)sender;

@end

ContentController.m

//From Apple's PageControl sample code

#import "AppDelegate.h"
#import "ContentController.h"
#import "MyViewController.h"

//Private methods
@interface ContentController (PrivateMethods)
- (void)loadScrollViewWithPage:(int)page;
- (void)scrollViewDidScroll:(UIScrollView *)sender;
@end

@implementation ContentController

@synthesize scrollView, pageControl, viewControllers;

static NSUInteger kNumberOfPages = 6;

- (void)viewDidLoad {
    [super viewDidLoad];

    //Do any additional setup after loading the view, typically from a nib.
    self.navigationController.navigationBar.hidden=YES;

    //view controllers are created lazily in the meantime, load the array with
    //placeholders which will be replaced on demand
    NSMutableArray *controllers = [[NSMutableArray alloc] init];
    for (unsigned i = 0; i < kNumberOfPages; i++) {
        [controllers addObject:[NSNull null]];
    }
    self.viewControllers = controllers;

    //a page is the width of the scroll view
    scrollView.pagingEnabled = YES;
    scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * kNumberOfPages, scrollView.frame.size.height);
    scrollView.showsHorizontalScrollIndicator = NO;
    scrollView.showsVerticalScrollIndicator = NO;
    scrollView.scrollsToTop = NO;
    scrollView.delegate = self;

    pageControl.numberOfPages = kNumberOfPages;
    pageControl.currentPage = 0;

    //pages are created on demand
    //load the visible page
    //load the page on either side to avoid flashes when the user starts scrolling
    [self loadScrollViewWithPage:0];
    [self loadScrollViewWithPage:1];
}

- (void)viewDidUnload {
    [super viewDidUnload];

    //Release any retained subviews of the main view.
    //e.g. self.myOutlet = nil;
    self.pageControl=nil;
    self.pageControl = nil;
    self.viewControllers = nil;
}

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

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

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

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

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    //Return YES for supported orientations
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    //Release any cached data, images, etc that aren't in use.
}

- (void)loadScrollViewWithPage:(int)page {
    if (page < 0)
        return;
    if (page >= kNumberOfPages)
        return;

    //replace the placeholder if necessary
    MyViewController *controller = [viewControllers objectAtIndex:page];

    if ((NSNull *)controller == [NSNull null]) //<== *** HERE SEEMS TO BE THE ERROR ***
    {
        controller = [[MyViewController alloc] initWithPageNumber:page
                                                  initWithNibName:nil
                                                           bundle:nil];

        [viewControllers replaceObjectAtIndex:page withObject:controller];
    }

    //add the controller's view to the scroll view
    if (controller.view.superview == nil)
    {
        CGRect frame = scrollView.frame;
        frame.origin.x = frame.size.width * page;
        frame.origin.y = 0;
        controller.view.frame = frame;
        [scrollView addSubview:controller.view];
    }
}

- (void)scrollViewDidScroll:(UIScrollView *)sender {
    //We don't want a "feedback loop" between the UIPageControl and the scroll delegate in
    //which a scroll event generated from the user hitting the page control triggers updates from
    //the delegate method. We use a boolean to disable the delegate logic when the page control is used.
    if (pageControlUsed) {
        //do nothing - the scroll was initiated from the page control, not the user dragging
        return;
    }

    //Switch the indicator when more than 50% of the previous/next page is visible
    CGFloat pageWidth = scrollView.frame.size.width;
    int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
    pageControl.currentPage = page;

    //load the visible page and the page on either side of it (to avoid flashes when the user starts scrolling)
    [self loadScrollViewWithPage:page - 1];
    [self loadScrollViewWithPage:page];
    [self loadScrollViewWithPage:page + 1];

    //A possible optimization would be to unload the views+controllers which are no longer visible
}

//At the begin of scroll dragging, reset the boolean used when scrolls originate from the UIPageControl
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    pageControlUsed = NO;
}

- (IBAction)changePage:(id)sender {
    int page = pageControl.currentPage;

    //load the visible page and the page on either side of it (to avoid flashes when the user starts scrolling)
    [self loadScrollViewWithPage:page - 1];
    [self loadScrollViewWithPage:page];
    [self loadScrollViewWithPage:page + 1];

    //update the scroll view to the appropriate page
    CGRect frame = scrollView.frame;
    frame.origin.x = frame.size.width * page;
    frame.origin.y = 0;
    [scrollView scrollRectToVisible:frame animated:YES];

    //Set the boolean used when scrolls originate from the UIPageControl. See scrollViewDidScroll: above.
    pageControlUsed = YES;
}

@end

MyViewController.h

#import <UIKit/UIKit.h>

@interface MyViewController : UIViewController {
    UILabel *pageNumberLabel;
    int pageNumber;
}

@property (nonatomic, retain) IBOutlet UILabel *pageNumberLabel;

- (id)initWithPageNumber:(int)page initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil;

@end

MyViewController.m

#import "MyViewController.h"

@implementation MyViewController

@synthesize pageNumberLabel;

- (void)loadView {
}

- (void)viewDidLoad {
    [super viewDidLoad];

    //Set the label and background color when the view has finished loading
    pageNumberLabel.text = [NSString stringWithFormat:@"Page %d", pageNumber + 1];
}

- (void)viewDidUnload {
    [super viewDidUnload];
    //Release any retained subviews of the main view.
    //e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    //Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

//Load the view nib and initialize the pageNumber ivar
//classic initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
//class adapted to init the page number
///!\ be careful, I'm not sure it's working properly
- (id)initWithPageNumber:(int)page initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    pageNumber = page;
    NSLog(@"pageNumber = %i", pageNumber);
}

- (void)didReceiveMemoryWarning {
//Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
//Release any cached data, images, etc that aren't in use.
}

@end

InformationsquelleAutor l_r | 2012-01-03