如何在objective c中缩放和滑动来自webservise的多张图片

#import "ViewController.h"

@interface ViewController () <UIScrollViewDelegate>

@property (nonatomic, strong) UIScrollView *scrollView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 创建UIScrollView对象
    self.scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];
    self.scrollView.contentSize = CGSizeMake(self.view.bounds.size.width * numberOfImages, self.view.bounds.size.height);
    self.scrollView.delegate = self;
    self.scrollView.minimumZoomScale = 1.0;
    self.scrollView.maximumZoomScale = 3.0;
    [self.view addSubview:self.scrollView];
    
    // 从Web服务获取图片URL并请求图片数据
    for (int i = 0; i < numberOfImages; i++) {
        NSURL *imageURL = [NSURL URLWithString:[NSString stringWithFormat:@"http://example.com/image%d.jpg", i]];
        NSURLRequest *request = [NSURLRequest requestWithURL:imageURL];
        NSURLSessionDataTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
            if (data) {
                UIImage *image = [UIImage imageWithData:data];
                dispatch_async(dispatch_get_main_queue(), ^{
                    // 创建UIImageView对象并添加到UIScrollView中
                    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(i * self.view.bounds.size.width, 0, self.view.bounds.size.width, self.view.bounds.size.height)];
                    imageView.image = image;
                    imageView.contentMode = UIViewContentModeScaleAspectFit;
                    [self.scrollView addSubview:imageView];
                });
            }
        }];
        [task resume];
    }
}

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
    // 返回要缩放的视图对象
    return [scrollView.subviews firstObject];
}

@end