scrollview 例子2

代码：

#import "RootViewController.h"



@implementation RootViewController

@synthesize scrollView;



- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    

    int pageCount = 3;

    scrollView = [[UIScrollView alloc]initWithFrame:[[UIScreen mainScreen] applicationFrame]];

    [self.view addSubview:scrollView];

    

    scrollView.backgroundColor = [UIColor redColor];

    scrollView.scrollEnabled = NO;

    scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * pageCount, scrollView.frame.size.height);

    scrollView.pagingEnabled = YES;

    scrollView.showsHorizontalScrollIndicator = YES;

    scrollView.delegate = self;

    

    CGRect rect = [[UIScreen mainScreen]bounds];

    NSArray *colors = [NSArray arrayWithObjects:[UIColor yellowColor], [UIColor blueColor], [UIColor purpleColor], nil];

    

    for (int i = 0; i < pageCount; i++) {

        

        CGRect aRect = CGRectMake(rect.origin.x + (i * rect.size.width), rect.origin.y,

                                  rect.size.width, rect.size.height);

        UIView *view1 = [[UIView alloc]initWithFrame:aRect];

        view1.backgroundColor = colors[i];

        [scrollView addSubview:view1];

    }

    

    [self moveToPage:3];

}



- (void) moveToPage:(int)index

{

    index--;

    CGRect rect = [[UIScreen mainScreen]bounds];

    CGPoint point = CGPointMake(rect.size.width * index, 0);

    [scrollView setContentOffset:point];

}



- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

{

    // 拖拽完毕以后调用

    int index = [self getPageIndex:scrollView];

    NSLog(@"index = %d",index);

}



-(int) getPageIndex:(UIScrollView *)scrollView

{

    return fabs(scrollView.contentOffset.x) /  scrollView.frame.size.width;

}



@end