UIPageControl页面控制的控件

#import "ViewController.h"

#import "LazyScrollView.h"

@interface ViewController ()<UIScrollViewDelegate>

{

UIPageControl *pageControl;

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

UIScrollView *scroView = [[UIScrollView alloc]initWithFrame:[UIScreen mainScreen].bounds];

scroView.contentSize = CGSizeMake(CGRectGetWidth([UIScreen mainScreen] .bounds)*10, 0);

scroView.delegate = self;// ?

[self.view addSubview:scroView];

CGFloat width = CGRectGetWidth([UIScreen mainScreen].bounds);

for (int i=0; i<10; i++) {

UIView *view = [[UIView alloc]initWithFrame:CGRectMake(width*i, 0, width, CGRectGetHeight([UIScreen mainScreen].bounds))];

view.backgroundColor = [UIColor purpleColor];

view.layer.borderWidth = 4;// ?

view.alpha = 0.7;

view.layer.borderColor = [UIColor whiteColor].CGColor;

[scroView addSubview:view];

}

//  UIPageControl页面控制的控件

/*

可以通过UIPageControl 来确定  当前视图在哪一页

1、一共有多少页  numberOfPages

2、当前页面   currentPage

UIPageControl ->.....

*/

pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, 300, CGRectGetWidth([UIScreen mainScreen].bounds), 30)];

//总共有多少页

pageControl.numberOfPages = 10;

//默认的当前页面

pageControl.currentPage = 0;

//设置页面控制的轨道颜色

pageControl.pageIndicatorTintColor = [UIColor brownColor];

//设置当前页面 点 的颜色

pageControl.currentPageIndicatorTintColor = [UIColor lightGrayColor];

//当一个页面的时候隐藏点点点

pageControl.hidesForSinglePage = YES;

[self.view addSubview:pageControl];

//如果默认页面  不是第一个页面  可以通过contentOffset  去设置偏移到哪一个位置

scroView.contentOffset = CGPointMake(CGRectGetWidth([UIScreen mainScreen].bounds)*pageControl.currentPage, 0);

}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

{

NSInteger curIndex = scrollView.contentOffset.x/CGRectGetWidth(scrollView.frame);

NSLog(@"%ld",curIndex);

pageControl.currentPage = curIndex;

}