Question

您好我在iOS中使用网址从服务器获取单张图片。

我的代码就像这样

- (IBAction)overlaysClicked:(id)sender
{
    NSLog(@"overlays Clicked");
    request = [NSURLRequest requestWithURL:[NSURL         URLWithString:@"http://sukhada.co.in/img/overlays/neon/ov1.png"]];
    [NSURLConnection connectionWithRequest:request delegate:self];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,   NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *localFilePath = [documentsDirectory    stringByAppendingPathComponent:@"image.jpg"];

    NSData *thedata = [NSData dataWithContentsOfURL:[NSURL    URLWithString:@"http://sukhada.co.in/img/overlays/neon/ov1.png"]];
    [thedata writeToFile:localFilePath atomically:YES];

    UIImage *img = [[UIImage alloc] initWithData:thedata];

    self.overlayImgView.image=img;
}

从服务器我的代码中获取多个图像

NSURL *myUrl = [NSURL URLWithString:@"http://sukhada.co.in/img/overlays/neon.zip"];
NSURLRequest *myRequest = [NSURLRequest requestWithURL:myUrl cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:60];
myData = [[NSMutableData alloc] initWithLength:0];
NSURLConnection *myConnection = [[NSURLConnection alloc] initWithRequest:myRequest delegate:self startImmediately:YES];

//我的数组在viewDidload

中是这样的

self.overlaysImgsArray = [[NSMutableArray alloc]initWithContentsOfURL:[NSURL    URLWithString:@"http://sukhada.co.in/img/overlays/neon.zip"]];
NSLog(@"urls is %@",overlaysImgsArray);
for (int i=0; i<[overlaysImgsArray count]; i++)  
//download array have url links
{
    NSURL *URL = [NSURL URLWithString:[overlaysImgsArray objectAtIndex:i]];
    NSMutableURLRequest *urlRequest = [[NSMutableURLRequest alloc]initWithURL:URL];
    NSOperationQueue *queue = [[NSOperationQueue alloc]init];
    [NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
    {
        if([data length] > 0 && [[NSString stringWithFormat:@"%@",error] isEqualToString:@"(null)"])
        {
            //make your image here from data.
            UIImage *imag = [[UIImage alloc] initWithData:[NSData dataWithData:data]];
            NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
            NSString *docDir = [array objectAtIndex:0];
            NSString *imgstr=[NSString stringWithFormat:@"%d",i];
            NSString *pngfilepath = [NSString stringWithFormat:@"%@sample%@.png",docDir,imgstr];
            NSData *data1 = [NSData dataWithData:UIImagePNGRepresentation(imag)];
            [data1 writeToFile:pngfilepath atomically:YES];
        }
        else if ([data length] == 0 && [[NSString stringWithFormat:@"%@",error] isEqualToString:@"(null)"])
        {
            NSLog(@"No Data!");
        }
        else if (![[NSString stringWithFormat:@"%@",error] isEqualToString:@"(null)"]){
            NSLog(@"Error = %@", error);
        }
    }];
    }
}

但这对我不起作用，请有人建议我如何使用包含所有图像的一个网址从服务器获取多个图像。请任何人提前谢谢你

Answer 1

在您的情况下，您可以尝试这样做首先，您需要将所有10个图像保存在目录中并逐个获取作为您的要求。此代码保存您网址中的所有图像

试试这个

- (IBAction)overlaysClicked:(id)sender {


//Note all your image saved with ov1.png,ov2.png......& so . 

       for (int i=1; i<=10; i++) {

    NSString *st2=@"ov";
    NSString *st1=@"http://sukhada.co.in/img/overlays/neon/ov";
    NSString *imageN=[st2 stringByAppendingString:[NSString stringWithFormat:@"%d",i]];
    NSString *imgNameforkey=[imageN stringByAppendingString:@".png"];
    NSString *url=[st1 stringByAppendingString:[NSString stringWithFormat:@"%d",i]];

    NSString *imgname=[url stringByAppendingString:@".png"];
    NSLog(@" all=%@",imgname);


    NSLog(@"overlays Clicked");
    request = [NSURLRequest requestWithURL:[NSURL         URLWithString:imgname]];
    [NSURLConnection connectionWithRequest:request delegate:self];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,   NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *localFilePath = [documentsDirectory    stringByAppendingPathComponent:imgname];

    NSData *thedata = [NSData dataWithContentsOfURL:[NSURL    URLWithString:imgname]];
    [thedata writeToFile:localFilePath atomically:YES];


    UIImage *img = [[UIImage alloc] initWithData:thedata];

    NSLog(@"imgs %@",img);
   // self.overlayImgView.image=img;
       }
}

在这里，您可以看到所有已保存的图像 enter image description here

获取图片

使用循环或名称

NSArray *directoryPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *imagePath =  [directoryPath objectAtIndex:0];
imagePath= [imagePath stringByAppendingPathComponent:@"ov1.png"];

 NSData *data = [NSData dataWithContentsOfFile:imagePath];
    UIImage *img = = [UIImage imageWithData:data];

从url下载zip文件并保存。使用此代码在按钮操作中。现在不需要循环。试试这个

- (IBAction)overlaysClicked:(id)sender {
    dispatch_queue_t queue = dispatch_get_global_queue(0,0);
    dispatch_async(queue, ^{

        NSLog(@"Beginning download");
        NSString *stringURL = @"http://sukhada.co.in/img/overlays/neonra.zip";
        NSURL  *url = [NSURL URLWithString:stringURL];
        NSData *urlData = [NSData dataWithContentsOfURL:url];

        //Find a cache directory. You could consider using documenets dir instead (depends on the data you are fetching)
        NSLog(@"Got the data!");
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
        NSString *path = [paths  objectAtIndex:0];

        //Save the data
        NSLog(@"Saving");
        NSString *dataPath = [path stringByAppendingPathComponent:@"img.zip"];
        dataPath = [dataPath stringByStandardizingPath];
        [urlData writeToFile:dataPath atomically:YES];

    });
}

并检查您将获得img.zip文件 enter image description here

如何在iOS中使用url从服务器获取多个图像

1 个答案: