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

来源：互联网发布：mac可以玩什么国内网游编辑：程序博客网时间：2024/05/20 20:55

注意：MRC模式

在.h中声明两个属性

#import <UIKit/UIKit.h>@interface RootViewController : UIViewController@property (nonatomic, retain) UIScrollView *myScrollView;@property (nonatomic, retain) UIPageControl *myPageControl;@end

释放

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

在viewDidLoad中创建UIScrollView对象和UIPageControl对象

添加一个宏定义#define kPageControlHeight 50

- (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);}

0 0