用UIScrollView实现相册,并设置滚动条消失,改变UIPageControl的颜色,实现循环滚动相册

最新推荐文章于 2017-10-17 10:13:00 发布

原创最新推荐文章于 2017-10-17 10:13:00 发布 · 833 阅读

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#UIScrollView #UIPageControl

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本文介绍如何使用UIScrollView和UIPageControl实现iOS应用中的滑动分页效果，包括页面之间的图片展示、滑动切换及分页指示器联动等功能。

#import <UIKit/UIKit.h>


@interface MainViewController : UIViewController<UIScrollViewDelegate>

    UIScrollView * _scroll;

    UIPageControl * _page;


@property (nonatomic, copy) NSArray * arr;


@end

- (void)dealloc
{
    [_arr release];
    _arr = nil;
    [super dealloc];
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
        self.arr = [NSArray arrayWithObjects:@"10.jpg",@"1.jpg",@"2.jpg",@"3.jpg",@"4.jpg",@"5.jpg",@"6.jpg",@"7.jpg",@"8.jpg",@"9.jpg",@"10.jpg",@"1.jpg", nil];
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    _scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 30, 320, 400)];
    //设置背景颜色
    [_scroll setBackgroundColor:[UIColor blueColor]];
    //设置大小
    [_scroll setContentSize:CGSizeMake(320 * 12, 400)];
    //设置偏移量
    [_scroll setContentOffset:CGPointMake(320, 0)];
    [_scroll setBounces:NO];
  
    //设置代理人
    _scroll.delegate = self;
    //每次翻滚一页
    _scroll.pagingEnabled = YES;
    //设置下面滚动条出现和隐藏
    _scroll.showsHorizontalScrollIndicator = NO;
    
    [self.view addSubview:_scroll];
    [_scroll release];
    
    
    _page = [[UIPageControl alloc]initWithFrame:CGRectMake(0, 440, 320, 30)];
    [_page setBackgroundColor:[UIColor magentaColor]];
    _page.alpha = 0.5;
    [_page setNumberOfPages:10];
    [_page setCurrentPageIndicatorTintColor:[UIColor blueColor]];
    [_page addTarget:self action:@selector(pageAction:) forControlEvents:UIControlEventValueChanged];
    
    
    
    
    [self.view addSubview:_page];
    [_page release];
    
    int i = 0;
    for (NSString * name in self.arr) {
        
        if (!name) {
            break;
        }
        
        NSLog(@"%@",name);
        UIScrollView * Lscroll = [[UIScrollView alloc]initWithFrame:CGRectMake(320 * i, 0, 320, 400)];
//        NSString * name = [NSString stringWithFormat:@"%d.jpg",i];
        UIImageView * image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:name]];
        [image setFrame:CGRectMake(0, 0, 320, 400)];
        //设置放大缩小的值
        [Lscroll setMinimumZoomScale:0.5f];
        [Lscroll setMaximumZoomScale:2.0f];
        
        
        [Lscroll addSubview:image];
        [_scroll addSubview:Lscroll];
        
        Lscroll.delegate = self;
        
        [image release];
        [Lscroll release];
       
        
        i++;
        
    }
    NSLog(@"%d",i);
//    UIImageView * image = [[UIImageView alloc]init];
    
}

#pragma mark -
#pragma mark pageControl

- (void)pageAction:(id)sender
{
    UIPageControl * page = (UIPageControl *)sender;
    
    [_scroll setContentOffset:CGPointMake(page.currentPage * 320 + 320, 0)];
    
    
}

#pragma mark -
#pragma mark scroll

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
//    [_page setCurrentPage:_scroll.contentOffset.x/300];
    
    if (_scroll.contentOffset.x == 320 * 11) {
        [_scroll setContentOffset:CGPointMake(320, 0)];
        _page.currentPage = 0;
    }else if (_scroll.contentOffset.x == 0){
        [_scroll setContentOffset:CGPointMake(320 * 10, 0)];
        _page.currentPage = 10;
    }else{
        [_page setCurrentPage:(_scroll.contentOffset.x-320)/320];
    }
    
}



- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    NSArray * arr = [scrollView subviews];
    
    return [arr objectAtIndex:0];
}


- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    
//    UIScrollView * scro = [[_scroll subviews] objectAtIndex:_page.currentPage];
//    [scro setZoomScale:1.0f];
    
    for (UIScrollView * temp in [scrollView subviews]) {
        if ([temp isKindOfClass:[UIScrollView class]]) {
            [temp setZoomScale:1];
        }
    }

 }



- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}



@end