一、基本知识
#import "ViewController.h"
@interface ViewController ()<UIScrollViewDelegate>{
UIScrollView *scrollview;
UIPageControl *page;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
page = [[UIPageControl alloc]initWithFrame:CGRectMake(20, 150, 200, 30)];
page.backgroundColor = [UIColor yellowColor];
page.numberOfPages = 10;//设置页数（多少个点）
page.currentPage = 0;//设置当前选中页
NSLog(@"%zi",page.currentPage);//获取当前选中页下标
page.pageIndicatorTintColor = [UIColor greenColor];//未选中颜色
page.currentPageIndicatorTintColor = [UIColor redColor];//当前选中的颜色
[page addTarget:self action:@selector(change:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:page];
scrollview = [[UIScrollView alloc]initWithFrame:CGRectMake(20, 150, 300, 400)];
scrollview.contentSize = CGSizeMake(900, 0);
scrollview.delegate = self;
scrollview.pagingEnabled = YES;
[self.view addSubview:scrollview];
UIView *view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 300, 400)];
view.backgroundColor = [UIColor grayColor];
[self.view addSubview:view];
UIView *view1 = [[UIView alloc]initWithFrame:CGRectMake(300, 0, 300, 400)];
view1.backgroundColor = [UIColor blackColor];
[self.view addSubview:view1];
UIView *view2 = [[UIView alloc]initWithFrame:CGRectMake(600, 0, 300, 400)];
view2.backgroundColor = [UIColor yellowColor];
[self.view addSubview:view2];
}
-(void)change:(id)pc{
NSLog(@"%zi",[pc currentPage]);//获取页数
CGPoint p = {[pc currentPage]*300,0};//
[scrollview setContentOffset:p animated:YES];//允许动画
}
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
int index = scrollview.contentOffset.x/scrollview.frame.size.width;
page.currentPage = index;
}