PageControlの基本作成です。

#import "PageViewController.h"

@interface PageViewController ()

{

    BOOL pageControlBeingUsed;

    NSMutableArray *myObject;

}

@property (retain, nonatomic) IBOutlet UIScrollView *scrollView;

@property (retain, nonatomic) IBOutlet UIPageControl *pageControl;

@end

@implementation PageViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

    myObject = [[NSMutableArray alloc] init];

    [myObject addObject:@"img01"];

    [myObject addObject:@"img02"];

    [myObject addObject:@"img03"];

    [myObject addObject:@"img04"];

    pageControlBeingUsed = NO;

    CGRect screenRect = [[UIScreen mainScreen] bounds];

    CGFloat screenWidth = screenRect.size.width;

    //CGFloat screenHight = screenRect.size.height;

    for (int i = 0; i < [myObject count]; i++) {

        CGRect frame;

        frame.origin.x = self.scrollView.frame.size.width * i;

        frame.origin.y = 0;

        frame.size = self.scrollView.frame.size;

        NSString *val = [myObject objectAtIndex:i];

        UIImage* theImage = [UIImage imageNamed:val];

        //UIImageView *img=[[UIImageView alloc] initWithFrame:

            CGRectMake(screenWidth*i,0,theImage.size.width ,theImage.size.height)];

        // screenWidth 高さ調節

        UIImageView *img=[[UIImageView alloc] initWithFrame:

            CGRectMake(screenWidth*i,0,screenWidth ,580)];

        img.image = theImage;

        [self.scrollView addSubview:img];

    }

    self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width *

                               [myObject count], self.scrollView.frame.size.height-100);

    self.pageControl.currentPage = 0;

    self.pageControl.numberOfPages = [myObject count];

}

- (void)scrollViewDidScroll:(UIScrollView *)sender {

    if (!pageControlBeingUsed) {

        // Switch the indicator when more than 50% of the previous/next page is visible

        CGFloat pageWidth = self.scrollView.frame.size.width;

        int page = floor((self.scrollView.contentOffset.x - pageWidth / 2)

                                                            / pageWidth) + 1;

        self.pageControl.currentPage = page;

    }

}

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {

    pageControlBeingUsed = NO;

}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {

    pageControlBeingUsed = NO;

}

- (IBAction)changePage {

    // Update the scroll view to the appropriate page

    CGRect frame;

    frame.origin.x = self.scrollView.frame.size.width * self.pageControl.currentPage;

    frame.origin.y = 0;

    frame.size = self.scrollView.frame.size;

    [self.scrollView scrollRectToVisible:frame animated:YES];

    pageControlBeingUsed = YES;

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end

GitHub PageControl

▫️参考ページ

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