UIScrollView和UIPageControl的配合使用 - iOS - UI基础知识总结11

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@property (nonatomic, retain) UIScrollView *myScrollView;
@property (nonatomic, retain) UIPageControl *myPageControl;

@end

- (void)dealloc
{
[_myScrollView release];
[_myPageControl release];
[super dealloc];
}

- (void)viewDidLoad {
[super viewDidLoad];

self.view.backgroundColor = [UIColor grayColor];

self.myScrollView = [[UIScrollView alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
self.myScrollView.backgroundColor = [UIColor grayColor];
[self.view addSubview:self.myScrollView];
[self.myScrollView release];

// 给scrollView加图片
for (int i = 0; i < 6; i++) {
UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg",i+1]];
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(i*self.view.frame.size.width, 0, self.view.frame.size.width, self.view.frame.size.height)];
imageView.image = image;
[self.myScrollView addSubview:imageView];
[imageView release];
}

// 给scrollView设置contentSize
self.myScrollView.contentSize = CGSizeMake(6*self.view.frame.size.width, self.view.frame.size.height);
// 整页翻动（一页一页翻动）
self.myScrollView.pagingEnabled = YES;
// 给scrollView添加代理对象
self.myScrollView.delegate = self;

// 创建UIPageControl
self.myPageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height - kPageControlHeight, self.view.frame.size.width, kPageControlHeight)];
// 设置页数
self.myPageControl.numberOfPages = 6;
// 设置当前选中的点的颜色
self.myPageControl.currentPageIndicatorTintColor = [UIColor redColor];
// 设置未被选中的点的颜色
self.myPageControl.pageIndicatorTintColor = [UIColor cyanColor];
[self.view addSubview:self.myPageControl];
[self.myPageControl release];

// 给pageControl设置点击事件
[self.myPageControl addTarget:self action:@selector(myPageControlAction:) forControlEvents:UIControlEventValueChanged];
}

#pragma mark - UIScrollView Delegate
// scrollView的代理方法
// 滑动减速完成
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
NSLog(@"减速完成");
// 滑动一次结束时让pageControl的点跳动
// 先找到偏移量，再根据偏移量设置currentPage
self.myPageControl.currentPage = self.myScrollView.contentOffset.x / self.view.frame.size.width;
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
NSLog(@"正在滑动");
}

- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView
{
NSLog(@"开始减速");
}

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
NSLog(@"将要结束拖拽");
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
NSLog(@"已经结束拖拽");
}

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale
{
NSLog(@"已经完成缩放");
}

#pragma mark - pageControl 点击事件处理
- (void)myPageControlAction:(UIPageControl *)sender
{
self.myScrollView.contentOffset = CGPointMake(sender.currentPage * self.view.frame.size.width, 0);
}