ios使用UIScrollView和PageControl创建图片轮播

1.创建cocoa touch class

2.同时创建xib页面

3.SceneDelegate设置根视图控制器

//
//  SceneDelegate.m
//  iosstudy2024
//
//  Created by figo on 2024/8/5.
//

#import "SceneDelegate.h"
#import "WidgetViewController.h"

@interface SceneDelegate ()

@end

@implementation SceneDelegate


- (void)scene:(UIScene *)scene willConnectToSession:(UISceneSession *)session options:(UISceneConnectionOptions *)connectionOptions {
    // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
    // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
    // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
    //默认是使用ViewController，这里改成WidgetViewController为根视图
    WidgetViewController * wvc = [[WidgetViewController alloc]init];
    //[self.window setRootViewController:wvc];
    self.window.rootViewController=wvc;
}


- (void)sceneDidDisconnect:(UIScene *)scene {
    // Called as the scene is being released by the system.
    // This occurs shortly after the scene enters the background, or when its session is discarded.
    // Release any resources associated with this scene that can be re-created the next time the scene connects.
    // The scene may re-connect later, as its session was not necessarily discarded (see `application:didDiscardSceneSessions` instead).
}


- (void)sceneDidBecomeActive:(UIScene *)scene {
    // Called when the scene has moved from an inactive state to an active state.
    // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
    NSLog(@"%s",__func__);
}


- (void)sceneWillResignActive:(UIScene *)scene {
    // Called when the scene will move from an active state to an inactive state.
    // This may occur due to temporary interruptions (ex. an incoming phone call).
    NSLog(@"%s",__func__);
}


- (void)sceneWillEnterForeground:(UIScene *)scene {
    // Called as the scene transitions from the background to the foreground.
    // Use this method to undo the changes made on entering the background.
    NSLog(@"%s",__func__);
}


- (void)sceneDidEnterBackground:(UIScene *)scene {
    // Called as the scene transitions from the foreground to the background.
    // Use this method to save data, release shared resources, and store enough scene-specific state information
    // to restore the scene back to its current state.
    NSLog(@"%s",__func__);
}


@end

4.设计xib页面

5.编写WidgetViewController

//
//  WidgetViewController.m
//  iosstudy2024
//
//  Created by figo on 2024/12/5.
//

#import "WidgetViewController.h"

@interface WidgetViewController ()<UIScrollViewDelegate>
@property (weak, nonatomic) IBOutlet UIScrollView *scrollViewTest;
@property (weak, nonatomic) IBOutlet UIPageControl *pageControll;

@end

@implementation WidgetViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //1.实现了UIScrollViewDelegate，代理设置成自己
    self.scrollViewTest.delegate=self;
    
    //2.获取屏幕宽度
    float width=[UIScreen mainScreen].bounds.size.width;
    
    //3.设置scrollView宽和高
    [self.scrollViewTest setFrame:CGRectMake(0, 200, width, 200)];
    self.scrollViewTest.contentSize=CGSizeMake(3*width, 200);
    
    //4.添加3张imgView，imgView相对scrollView来说，那么它的左上角坐标是0,0,不要设置错，否则会不显示
    self.pageControll.numberOfPages=3;//这里设置页数，同图片数量，这里简单的添加3张
    UIImageView *imgView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, width, 200)];
    imgView.image=[UIImage imageNamed:@"star"];
    [self.scrollViewTest addSubview:imgView];
    
    UIImageView *imgView1=[[UIImageView alloc]initWithFrame:CGRectMake(0+width, 0, width, 200)];
    imgView1.image=[UIImage imageNamed:@"diamond"];
    [self.scrollViewTest addSubview:imgView1];
    
    UIImageView *imgView2=[[UIImageView alloc]initWithFrame:CGRectMake(0+2*width, 0, width, 200)];
    imgView2.image=[UIImage imageNamed:@"grape"];
    [self.scrollViewTest addSubview:imgView2];
}
//5.通过scrollView滑动偏移量计算pageIndex
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    CGFloat offset=self.scrollViewTest.contentOffset.x;
    NSInteger index=offset/[UIScreen mainScreen].bounds.size.width;
    self.pageControll.currentPage=index;
}
/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

6.运行效果