iOS UIPageControl簡單范例

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.h 文件代碼

 

#import 

@interface ViewController : UIViewController

{
    UIScrollView *_scrollView;
    NSMutableArray *slideImages;
    UIPageControl *_page;
}
@end

.m 文件代碼

 

 

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad{
    
    [super viewDidLoad];
    
    _scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 20, 320, 240)];
    _scrollView.bounces = NO;
    _scrollView.pagingEnabled = YES;
    _scrollView.delegate = self;
    _scrollView.contentOffset = CGPointMake(320, 0);
    _scrollView.contentSize = CGSizeMake(1920,240);
    _scrollView.showsVerticalScrollIndicator =NO;
    _scrollView.showsHorizontalScrollIndicator = NO;
    _scrollView.userInteractionEnabled = YES;
    [self.view addSubview:_scrollView];
    
    slideImages = [[NSMutableArray alloc]initWithObjects:@"1.png",@"2.png",@"3.png",@"4.png", nil];
    UIImageView *imageView = [[UIImageView alloc]
                              initWithImage:[UIImage imageNamed:[slideImages objectAtIndex:([slideImages count]-1)]]];
    imageView.frame = CGRectMake(0, 0, 320, 240);
    [_scrollView addSubview:imageView];

    for (int i = 0;i<[slideImages count];i++) {
        //loop this bit
        UIImageView *imageView = [[UIImageView alloc]
                                  initWithImage:[UIImage imageNamed:[slideImages objectAtIndex:i]]];
        imageView.frame = CGRectMake(320*i+320, 0, 320, 240);
        imageView.userInteractionEnabled = YES;
        [_scrollView addSubview:imageView];
    }
    imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[slideImages objectAtIndex:0]]];
    imageView.frame = CGRectMake(320*5, 0, 320, 240);
    [_scrollView addSubview:imageView];
    _page = [[UIPageControl alloc]initWithFrame:CGRectMake(240, 230, 70, 30)];
    _page.numberOfPages = 4;
    _page.currentPage = 0;
    //    _page.backgroundColor = [UIColor grayColor];
    [_page addTarget:self action:@selector(pageAction) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_page];
    // Do any additional setup after loading the view.
    
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    int currentPage = (_scrollView.contentOffset.x - _scrollView.frame.size.width
                       / ([slideImages count]+2)) / _scrollView.frame.size.width + 1;
    NSLog(@"%d",currentPage);
    if (currentPage==0) {
        [_scrollView scrollRectToVisible:CGRectMake(320*4, 0, 320, 240) animated:NO];
    }
    else if (currentPage==([slideImages count]+1)) {
        //如果是最後+1,也就是要開始循環的第一個
        [_scrollView scrollRectToVisible:CGRectMake(320, 0, 320, 240) animated:NO];
    }
}

- (void)scrollViewDidScroll:(UIScrollView *)sender{
    int page = _scrollView.contentOffset.x/320-1;
    _page.currentPage = page;
}

-(void)pageAction{
    int page = _page.currentPage;
    [_scrollView setContentOffset:CGPointMake(320 * (page+1), 0)];
}
- (void)didReceiveMemoryWarning{
    [super didReceiveMemoryWarning];
    
    // Dispose of any resources that can be recreated.
    
}
@end