UIScrollView 与 UIPageView 的联合使用

 

 @interface ViewController : UIViewController<UIScrollViewDelegate>

{

UIScrollView * scrollView;

UIPageControl * pageControl;

//    BOOL pageControlIsChangingPage;

NSMutableArray * images;

}

//- (void)changePage:(id)sender;

- (void)setupPage;

@end

 

 

 

 

@implementation ViewController

- (void)viewDidLoad

{

[super viewDidLoad];

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

self.view.backgroundColor = [UIColor blackColor];

scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 400)];

pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 410, 320, 36)];

images = [NSMutableArray arrayWithObjects:@"h1.jpeg",@"h2.jpeg",@"h3.jpeg",@"h4.jpeg",@"h5.jpeg",@"h6.jpeg",@"h7.jpeg",@"h8.jpeg", nil];

[self.view addSubview:scrollView];

[self.view addSubview:pageControl];

[self setupPage];

}

////多余的方法

//- (void)changePage:(id)sender

//{

//

//    NSLog(@"%s",__func__);

//    CGRect frame = scrollView.frame;

//

//    frame.origin.x = frame.size.width * pageControl.currentPage;

//    frame.origin.y = 0;

//

//    [scrollView scrollRectToVisible:frame animated:YES];

//

//    pageControlIsChangingPage = YES;

//

//}

- (void)setupPage

{

NSLog(@"%s",__func__);

scrollView.delegate = self;

[scrollView setBackgroundColor: [UIColor blackColor]];

//

[scrollView setCanCancelContentTouches:NO];

scrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite ;

//    //

//    scrollView.clipsToBounds  = YES;

//

//    scrollView.scrollEnabled = YES;

scrollView.pagingEnabled = YES;

//    //

//    scrollView.directionalLockEnabled = YES;

//

//隐藏滚动条

scrollView.alwaysBounceVertical = NO;

scrollView.alwaysBounceHorizontal = NO;

scrollView.showsHorizontalScrollIndicator = NO;

scrollView.showsVerticalScrollIndicator = NO;

NSInteger nimages = 0;

CGFloat cx = 0 ;//定义下一幅图片的的坐标

//循环导入图片

for(NSString * imagePath in images)

{

//        UIImageView * imageView = [[[UIImageView alloc] initWithFrame:CGRectZero]autorelease];

//

//        [imageView setBackgroundColor: [UIColor colorWithRed:.6 green:.6 blue:.6 alpha:1.0]];

//

//        UIImage * image = [UIImage imageNamed:imagePath];

//

//        [imageView setImage:image];

UIImageView * imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:imagePath]];

CGRect rect = scrollView.frame;

rect.size.height = scrollView.frame.size.height;

rect.size.width = scrollView.frame.size.width;

rect.origin.x = cx;

rect.origin.y = 0;

imageView.frame = rect;

imageView.contentMode = UIViewContentModeScaleAspectFill;

[scrollView addSubview:imageView];

cx += scrollView.frame.size.width;

nimages ++;

}

//    //不必要的事件

//    [pageControl addTarget:self action:@selector(changePage:) forControlEvents:UIControlEventValueChanged];

pageControl.currentPage = 0;

pageControl.numberOfPages = nimages;

pageControl.tag = 0;

[scrollView setContentSize:CGSizeMake(cx, [scrollView bounds].size.height)];

}

//scrollViewkai

- (void)scrollViewDidScroll:(UIScrollView *)_scrollView

{

NSLog(@"%s",__func__);

//    if(pageControlIsChangingPage)

//    {

//        return;

//    }

//画面拖动超过百分之五十进行切换

//返回page的值

CGFloat pageWidth = _scrollView.frame.size.width;

//函数名： floor  功 能： 返回小于或者等于指定表达式的最大整数

//函数名： ceil  功 能： 返回大于或者等于指定表达式的最小整数

int page = floor((_scrollView.contentOffset.x - pageWidth/2)/pageWidth)+1;

pageControl.currentPage = page;

}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

{

NSLog(@"%s",__func__);

//    pageControlIsChangingPage = NO;

}

- (void)dealloc

{

[images release];

[scrollView release];

[pageControl release];

[super dealloc];

}