将带有分页的 UIScrollView 添加到现有的 UIViewController

Posted 2023-03-16

【中文标题】将带有分页的 UIScrollView 添加到现有的 UIViewController

【英文标题】：Add UIScrollView with Paging to Existing UIViewController

【发布时间】：2013-08-16 12:21:58

【问题描述】：

我想添加一个带有分页功能的 UIScrollView，以从我现有的视图控制器（我的应用程序的根视图）浏览不同的视图。我也有标签栏和导航栏控制器。我可以在这个视图控制器中添加一个滚动视图来完成我想要的吗？如果是这样，有人可以为我指出正确的方向吗？

这是我的视图控制器。

#import "KFBViewController.h"
#import "ListViewController.h"
#import "ActionAlertsViewController.h"
#import "MarketUpdatesViewController.h"
#import "AgStoriesViewController.h"
#import "KFBNewsViewController.h"
#import "MemberBenefits.h"
#import "SocialNetworks.h"
#import "WebViewController.h"
#import "YouTubeView.h"
#import "KFBFlickrViewController.h"
#import "RSFM.h"
#import "UAPush.h"
#import "TUSafariActivity.h"

@interface KFBViewController ()




@end

@implementation KFBViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self)
    
        self.title = NSLocalizedString(@"Home", @"Home");
        self.tabBarItem.image = [UIImage imageNamed:@"home"];
        self.navigationController.delegate = self;
    
    return self;


- (void) showMenu

    NSURL *urlToShare = [NSURL URLWithString:@"https://itunes.apple.com/us/app/kentucky-farm-bureau/id580530986?mt=8"];
    NSArray *activityItems = @[urlToShare];
    // TUSafariActivity *activity = [[TUSafariActivity alloc] init];

    UIActivityViewController *activityVC = [[UIActivityViewController alloc]initWithActivityItems:activityItems applicationActivities:nil];
    activityVC.excludedActivityTypes = @[UIActivityTypePrint, UIActivityTypeAssignToContact, UIActivityTypePostToWeibo, UIActivityTypeSaveToCameraRoll];

    [self presentViewController:activityVC animated:TRUE completion:nil];


- (IBAction)gotoSecondView

    YouTubeView *youTubeView = [[YouTubeView alloc] initWithNibName:@"YouTubeView" bundle:nil];
    youTubeView.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentViewController:youTubeView animated:YES completion:nil];

- (IBAction)gotoPublicAffairs

    ListViewController *publicAffairs = [[ListViewController alloc]initWithStyle:UITableViewStylePlain];
    WebViewController *wvc = [[WebViewController alloc]init];
    [publicAffairs setWebViewController:wvc];
    publicAffairs.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.navigationController pushViewController:publicAffairs animated:YES];


- (IBAction)gotoActionAlerts

    ActionAlertsViewController *actionAlerts = [[ActionAlertsViewController alloc]initWithStyle:UITableViewStylePlain];
    WebViewController *wvc = [[WebViewController alloc]init];
    [actionAlerts setWebViewController:wvc];
    actionAlerts.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.navigationController pushViewController:actionAlerts animated:YES];


- (IBAction)gotoMarketUpdates

    MarketUpdatesViewController *marketUpdates = [[MarketUpdatesViewController alloc]initWithStyle:UITableViewStylePlain];
    WebViewController *wvc = [[WebViewController alloc]init];
    [marketUpdates setWebViewController:wvc];
    marketUpdates.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.navigationController pushViewController:marketUpdates animated:YES];


- (IBAction)gotoAgStories

    AgStoriesViewController *agStories = [[AgStoriesViewController alloc]initWithStyle:UITableViewStylePlain];
    WebViewController *wvc = [[WebViewController alloc]init];
    [agStories setWebViewController:wvc];
    agStories.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.navigationController pushViewController:agStories animated:YES];


- (IBAction)gotoKFBNews

    KFBNewsViewController *kfbNews = [[KFBNewsViewController alloc]initWithStyle:UITableViewStylePlain];
    WebViewController *wvc = [[WebViewController alloc]init];
    [kfbNews setWebViewController:wvc];
    kfbNews.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.navigationController pushViewController:kfbNews animated:YES];


- (IBAction)gotoMemberBenefits

    MemberBenefits *memberBenefits = [[MemberBenefits alloc] initWithNibName:nil bundle:nil];
    memberBenefits.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.navigationController pushViewController:memberBenefits animated:YES];


-(IBAction)gotoPhotos:(id)sender

    KFBFlickrViewController *photosView = [[KFBFlickrViewController alloc] initWithNibName:@"KFBFlickrViewController" bundle:nil];
    [self.navigationController pushViewController:photosView animated:YES];


- (IBAction)gotoSocialNetworks

    SocialNetworks *socialNetworks = [[SocialNetworks alloc] initWithNibName:nil bundle:nil];
    socialNetworks.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.navigationController pushViewController:socialNetworks animated:YES];


- (IBAction)gotoFarmMarkets

    RSFM *rsfm = [[RSFM alloc] initWithNibName:nil bundle:nil];
    rsfm.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.navigationController pushViewController:rsfm animated:YES];


- (IBAction)settingsButtonPressed:(id)sender

    [UAPush openApnsSettings:self animated:YES];


- (void)viewDidLoad

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.title = @"Home";

    UIBarButtonItem *settingsButton = [[UIBarButtonItem alloc] initWithTitle:@"\u2699" style:UIBarButtonItemStyleBordered target:self action:@selector(settingsButtonPressed:)];
    [settingsButton setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont boldSystemFontOfSize:24], UITextAttributeFont,nil] forState:UIControlStateNormal];
    self.navigationItem.leftBarButtonItem = settingsButton;

    UIBarButtonItem *systemAction = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(showMenu)];
    self.navigationItem.rightBarButtonItem = systemAction;


- (void)didReceiveMemoryWarning

    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.


-(NSUInteger)supportedInterfaceOrientations

    return UIInterfaceOrientationMaskPortrait;


@end

【参考方案1】：

这对我来说非常有效：

为您的UIScrollView 声明一个属性，并将您的 ViewController 设置为UIScrollViewDelegate

@interface ViewController : UIViewController<UIScrollViewDelegate>

@property (strong, nonatomic) UIScrollView *theScrollView;

@end

**请注意，我正在使用代码设置我的UIScrollView，但可以使用 XIB 轻松完成。

在您的 ViewController 的 viewDidLoad: 中

    self.theScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 50, self.view.frame.size.width, 300)];
    self.theScrollView.delegate = self;
    self.theScrollView.pagingEnabled = YES;
    self.theScrollView.showsHorizontalScrollIndicator = NO;     
    self.theScrollView.showsVerticalScrollIndicator = NO;
    [self.view addSubview:self.theScrollView];

    NSArray *viewArray = [NSArray arrayWithObjects://your UIViews];

    for(int i=0; i<viewArray.count; i++)
    
        CGRect frame;
        frame.origin.x = self.theScrollView.frame.size.width * i;
        frame.origin.y = 0;
        frame.size = self.theScrollView.frame.size;

        UIView *subview = [[UIView alloc] initWithFrame:frame];
        [subview addSubview:[viewArray objectAtIndex:i]];
        [self.theScrollView addSubview:subview];
    

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

大多数分页滚动视图也有一个与之关联的UIPageControl。为此，请覆盖此 UIScrollViewDelegate 方法：

- (void)scrollViewDidScroll:(UIScrollView *)sender 
    CGFloat pageWidth = self.theScrollView.frame.size.width;
    int page = floor((self.theScrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
    self.thePageControl.currentPage = page;

【讨论】：

它在这一行崩溃：[subview addSubview:[viewArray objectAtIndex:i]];将无法识别的选择器发送到实例 0xc18acd0

哪一行？ @user2029585

您是否使用您的UIView 对象加载了viewArray？似乎它正在崩溃，因为您的 viewArray 是空的，或者充满了 nil 对象。

KFBViewController *home = [[KFBViewController alloc]initWithNibName:@"KFBViewController" bundle:nil]; HomeTwo *homeTwo = [[HomeTwo alloc]initWithNibName:@"HomeTwo" bundle:nil]; NSArray *viewArray = [NSArray arrayWithObjects:home, homeTwo, nil];

您是否正在使用UIView 对象加载viewArray？还是UIViewController 对象？因为 'home' 似乎是一个 viewController。

【参考方案2】：

我可能会尝试使用UIPageViewController，而不是常规的分页滚动视图。

Apple 的PhotoScroller sample code 提供了一个很好的例子来说明如何使用UIPageViewController。

我还有一些 code on github 修改 PhotoScroller 以在 UIViewController 子类中加载 UIPageViewController。 （在 Apple 的示例代码中，UIPageViewController 是根视图控制器。）

我从来没有在每个页面中使用UIPageViewController 和不同的UIViewController 子类（PhotoScroller 示例代码在所有页面中都使用PhotoViewControllers），但我不明白为什么它不能用对代码进行少量修改。

【参考方案3】：

此链接对您有帮助。这里使用了页面控制器和滚动视图 -

PageControl Example in iPhone