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标题: ios - 如何从服务器获取多个图像并保存并在 iPhone 应用程序中显示它们？ [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-13 11:40
标题: ios - 如何从服务器获取多个图像并保存并在 iPhone 应用程序中显示它们？

我正在使用以下代码获取单个图像。但是，如何处理多张图片呢？

这是我的代码:

-(void)viewDidLoad 
{

 [super viewDidLoad];

[self performSelectorInBackgroundselector(loadImageIntoMemory) withObject:nil];

}

-(void)loadImageIntoMemory {

    NSLog(@"Beginning download");
    NSString *temp_Image_String = [[NSString alloc] initWithFormat"http://www.thewavestore.com/appproductimage/"];
    NSURL *url_For_Ad_Image = [[NSURL alloc] initWithString:temp_Image_String];
    NSData *data_For_Ad_Image = [[NSData alloc] initWithContentsOfURL:url_For_Ad_Image];
    UIImage *temp_Ad_Image = [[UIImage alloc] initWithData:data_For_Ad_Image];
    [self saveImage:temp_Ad_Image];
    UIImageView *imageViewForAdImages = [[UIImageView alloc] init];
    imageViewForAdImages.frame = CGRectMake(0, 0, 320, 480);
    imageView.image = [self loadImage];
    [self.view addSubview:imageView];
}

-(void)saveImageUIImage *)image {

    NSLog(@"Saving");
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString* path = [documentsDirectory stringByAppendingPathComponent: @"DSC02077129HT41.5W20L24WT18.555RS28775.jpg" ];
    NSData* data = UIImagePNGRepresentation(image);
    [data writeToFile:path atomically:YES];
}

-(UIImage *)loadImage {

    NSLog(@"Got the data!");
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString* path = [documentsDirectory stringByAppendingPathComponent"DSC02077129HT41.5W20L24WT18.555RS28775.jpg" ];
    UIImage* image = [UIImage imageWithContentsOfFile:path];
    return image;
}

请帮助解决这个问题，如果有任何好主意，请建议我。

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Best Answer-推荐答案

首先使用唯一名称保存您的图像(我使用当前时间)并将这些名称保存到数组中

NSData *imageData = UIImagePNGRepresentation(chosenImage);
    NSArray *paths = NSSearchPathForDirectoriesInDomains
    (NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat"yyyy-MM-dd hh:mm:ss"];
    // save image with currentdate and time in the name
    NSString * imageName = [NSString stringWithFormat"name_%@.png",[dateFormatter stringFromDate:[NSDate date]]];
    NSString *fullPathToFile = [documentsDirectory stringByAppendingPathComponent:imageName];
    //add all the images names to the imagepath array
    [imagePathArray addObject:imageName];
    //write image into file
    [imageData writeToFile:fullPathToFile atomically:YES];

然后从图像路径数组中检索图像

 for (NSString*path in imagePathArray ) {

            NSArray *filepart = [path componentsSeparatedByString"."];
            NSString *filename = [filepart objectAtIndex:0];
            NSString *extension = [filepart objectAtIndex:1];

            NSArray *paths = NSSearchPathForDirectoriesInDomains
            (NSDocumentDirectory, NSUserDomainMask, YES);
            NSString *documentsDirectory = [paths objectAtIndex:0];
            NSString *fileName = [NSString stringWithFormat"%@/%@",
                                  documentsDirectory,path];

            //NSString *filePath = [[NSBundle mainBundle] pathForResource:filename ofType:extension];
            NSData *fileData = [NSData dataWithContentsOfFile:fileName];
}

关于ios - 如何从服务器获取多个图像并保存并在 iPhone 应用程序中显示它们？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33582365/

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