iOS圖片輪播

標籤：

直接上代碼了，比較簡單。示範：Demo

////  UYViewController.m//  圖片輪播器////  Created by jiangys on 15/5/23.//  Copyright (c) 2015年 uxiaoyuan. All rights reserved.//#import "UYViewController.h"#define kImageCount 5@interface UYViewController ()<UIScrollViewDelegate>@property (nonatomic,strong) UIScrollView *scrollView;@property (nonatomic,strong) UIPageControl *pageControl;@property (nonatomic, strong) NSTimer *timer;@end@implementation UYViewController-(UIScrollView *)scrollView{    if (_scrollView==nil) {        //如果為空白，建立一個        _scrollView=[[UIScrollView alloc] initWithFrame:CGRectMake(10, 20, 300, 130)];        _scrollView.backgroundColor=[UIColor redColor];                //取消彈簧效果        _scrollView.bounces=NO;                // 取消水平捲軸        _scrollView.showsHorizontalScrollIndicator = NO;        _scrollView.showsVerticalScrollIndicator = NO;                // 要分頁        _scrollView.pagingEnabled = YES;                // contentSize        _scrollView.contentSize = CGSizeMake(kImageCount * _scrollView.bounds.size.width, 0);                // 設定代理        _scrollView.delegate = self;                [self.view addSubview:_scrollView];                         }    return _scrollView;}- (UIPageControl *)pageControl{    if (_pageControl == nil) {        // 分頁控制項，本質上和scrollView沒有任何關係，是兩個獨立的控制項        _pageControl = [[UIPageControl alloc] init];        // 總頁數        _pageControl.numberOfPages = kImageCount;        // 控制項尺寸        CGSize size = [_pageControl sizeForNumberOfPages:kImageCount];                _pageControl.bounds = CGRectMake(0, 0, size.width, size.height);        _pageControl.center = CGPointMake(self.view.center.x, 130);                // 設定顏色        _pageControl.pageIndicatorTintColor = [UIColor redColor];        _pageControl.currentPageIndicatorTintColor = [UIColor blackColor];                [self.view addSubview:_pageControl];                // 添加監聽方法        /** 在OC中，絕大多數"控制項"，都可以監聽UIControlEventValueChanged事件，button除外" */        [_pageControl addTarget:self action:@selector(pageChanged:) forControlEvents:UIControlEventValueChanged];    }    return _pageControl;}// 分頁控制項的監聽方法- (void)pageChanged:(UIPageControl *)page{    // 根據頁數，調整滾動視圖中的圖片位置 contentOffset    CGFloat x = page.currentPage * self.scrollView.bounds.size.width;    [self.scrollView setContentOffset:CGPointMake(x, 0) animated:YES];}- (void)viewDidLoad{    [super viewDidLoad];//設定圖片    for (int i=0; i<kImageCount; i++) {        NSString *imageName=[NSString stringWithFormat:@"img_%02d",i+1];        UIImage *image=[UIImage imageNamed:imageName];                UIImageView *imageView=[[UIImageView alloc] initWithFrame:self.scrollView.bounds];        imageView.image=image;                [self.scrollView addSubview:imageView];    }    //計算imageView    [self.scrollView.subviews enumerateObjectsUsingBlock:^(UIImageView *imageView, NSUInteger idx, BOOL *stop) {        // 調整x => origin => frame        CGRect frame = imageView.frame;        frame.origin.x = idx * frame.size.width;                imageView.frame = frame;    }];        // 分頁初始頁數為0    self.pageControl.currentPage = 0;        // 啟動時鐘    [self startTimer];    }- (void)startTimer{    self.timer = [NSTimer timerWithTimeInterval:2.0 target:self selector:@selector(updateTimer) userInfo:nil repeats:YES];    // 添加到運行迴圈    [[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];}- (void)updateTimer{    // 頁號發生變化    // (當前的頁數 + 1) % 總頁數    int page = (self.pageControl.currentPage + 1) % kImageCount;    self.pageControl.currentPage = page;    // 調用監聽方法，讓滾動視圖滾動    [self pageChanged:self.pageControl];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.s    }#pragma mark - ScrollView的代理方法// 滾動視圖停下來，修改頁面控制項的小點（頁數）- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{    // 計算頁數    int page = scrollView.contentOffset.x / scrollView.bounds.size.width;        self.pageControl.currentPage = page;}/** 修改時鐘所在的運行迴圈的模式後，抓不住圖片  解決方案：抓住圖片時，停止時鐘，送售後，開啟時鐘 */- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{    // 停止時鐘，停止之後就不能再使用，如果要啟用時鐘，需要重新執行個體化    [self.timer invalidate];}- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{    [self startTimer];}@end

 

iOS圖片輪播