ios - 如何在 objective c 中缩放和滑动来自 webservise 的多个图像

Question

1) 在我的应用程序中，我想缩放和收缩图像。在 xib 文件中，scrollview 中有一个 imageView。Page 控件用于滑动图像。对于单个图像，它会缩放，但对于多个图像(来自网络服务)，它不会滑动和缩放。 在 setMultipleImages 方法中，图像不会缩放和滑动，而如果图像是单个图像，它会正确缩放。 2)在UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:imageURL]]];行代码中，想用uiimageview替换uiimage。我该怎么做？

我的代码是:

-(void)setMultipleImages{

    for (int i = 0; i <  [imageMArray count]; i++){
        NSString *logoName;

        NSArray *imageNameArray = [[imageMArray objectAtIndex:i] componentsSeparatedByString:@"/"];

        logoName = [[NSString alloc]initWithFormat:@"%@",[imageNameArray lastObject]];

        if (![[AppDelegateHelper getInstance] fileExist:logoName])
        {
            NSString *imageURL = [[NSString alloc]initWithFormat:@"%@%@",[UrlBuilder getWebsiteUrl],[imageMArray objectAtIndex:i]];

            [self startProcessing];

           UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:imageURL]]];

            [activityIndicator stopAnimating];
           DebugLog(@"%f,%f",image.size.width,image.size.height);

            NSArray *docDir = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
            NSString *cacheDirectory = [docDir objectAtIndex:0];
            DebugLog(@"saving png");

            NSString *pngFilePath = [NSString stringWithFormat:@"%@/%@",cacheDirectory,[imageNameArray lastObject]];

          NSData *data1 = [NSData dataWithData:UIImageJPEGRepresentation(image, 1.0f)];

          [data1 writeToFile:pngFilePath atomically:YES];
        }
    }

    [self loadImageData];
}

 -(void)loadImageData
{
    int X =0;
    for (int s=0; s<imageMArray.count; s++) {
        NSString *logoName;

        NSArray *imageNameArray = [[imageMArray objectAtIndex:s] componentsSeparatedByString:@"/"];


        logoName = [[NSString alloc]initWithFormat:@"%@",[imageNameArray lastObject]];


        if([[AppDelegateHelper getInstance] loadImage:logoName] != nil)
        {
          //  UIImageView *imageView = [[UIImageView alloc] initWithFrame: CGRectMake(X, 0, scrollView.frame.size.width, 300)] ;

            [imageView setImage:[[AppDelegateHelper getInstance] loadImage:logoName]];

            imageView.contentMode = UIViewContentModeScaleAspectFit;

            [scrollView addSubview: imageView];

            X = X + imageView.frame.size.width;
        }
        else
        {
            //UIImageView *imageView = [[UIImageView alloc] initWithFrame: CGRectMake(X, 0, scrollView.frame.size.width, 300)] ;

            [imageView setImage:[UIImage imageNamed:@"NoImage.png"]];

            imageView.contentMode = UIViewContentModeScaleAspectFit;

            [scrollView addSubview: imageView];

            X = X + imageView.frame.size.width;
        }
    }

    self.pageControl.numberOfPages = [imageMArray count];

    scrollView.contentSize = CGSizeMake(X,scrollView.frame.size.height);

    lblCount.text = [[NSString alloc]initWithFormat:@"1 sur %lu",(unsigned long)imageMArray.count];
}

Answer 1

将所有图像添加到 imageview。然后将 pinchguesture 应用于 ImageView 以实现缩放效果。

捏手势:

UIPinchGestureRecognizer *imageviewguesture=[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(ImageViewPinchGuesture:)];

为您的 ImageView 添加捏手势:

[YourImageView addGestureRecognizer:imageviewguesture];

制作你的选择器方法:

-(void)ImageViewPinchGuesture:(UIPinchGestureRecognizer *)pinGuestureregonizer{    
pinGuestureregonizer.view.transform = CGAffineTransformScale(pinGuestureregonizer.view.transform, pinGuestureregonizer.scale, pinGuestureregonizer.scale);
pinGuestureregonizer.scale = 1;
}

在你的 .h 文件中添加这一行

-(void)ImageViewPinchGuesture:(UIPinchGestureRecognizer *)pinGuestureregonizer;

在模拟器中检查效果按 Cmd+alt 然后按鼠标左键并拖动。

希望这会有所帮助。如果对您有帮助，请不要忘记采纳答案。