Question

（xCode和编程新手）我正在尝试连接/下载/保存到变量并在ftp服务器上显示UIImageView中的图像。代码如下。任何帮助建议将不胜感激。

- (void)viewDidLoad
{
    //sets label to notify user whats happening
    NSMutableString *labelString;
    labelString = [NSMutableString stringWithString: @"Connecting"];
    [labelDymamic setText: labelString];

    //variable for ftp location
    NSString *ftpLocation = [NSString stringWithFormat:@"ftp2.bom.gov.au/anon/sample/gms/IDE00003.201011170430.gif"];
    //variable to recieve data
    NSMutableData *responseData;

    //loads ftpLocation into url
    NSURL *url = [NSURL URLWithString:ftpLocation];

    //sets label to notify user whats happening
    NSMutableString *labelStringDownloading;
    labelStringDownloading = [NSMutableString stringWithString: @"Downloading"];
    [labelDymamic setText: labelStringDownloading];

    //Connect to ftp
    self.ftpImageView.image = [UIImage imageNamed:@"Icon.png"];
    self.labelDymamic.text = @"Receiving";
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    (void) [[NSURLConnection alloc] initWithRequest: request delegate:self];

    //download image


    //save to variable


    //display to screen


    //sets label to notify application loading complete
    NSMutableString *labelLoadedString;
    labelLoadedString = [NSMutableString stringWithString: @"Radar"];
    [labelDymamic setText: labelLoadedString];

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

}

目前所有显示的内容都是带有labelLoadedString变量“Radar”的白色屏幕。

由于艾伦

Answer 1

你的网址错了，它错过了SCHEME：ftp：//

至于下载：

NSURLRequest *request = [NSURLRequest requestWithURL:url];

//download
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * r, NSData * d, NSError * e) {
    //save
    UIImage *img = [[UIImage alloc] initWithData:d];

    //display
    self.imageView.image = img;

    //sets label to notify application loading complete
    NSMutableString *labelLoadedString;
    labelLoadedString = [NSMutableString stringWithString: @"Radar"];
    [labelDymamic setText: labelLoadedString];
}];

Answer 2

修正您的网址后，如上所述，该网址显示不正确，请结帐AFNetworking（请参阅https://github.com/AFNetworking/AFNetworking）。 UIImage上有一个类别，可以让您在处理从远程位置加载图像时更加轻松（例如通过http，https，ftp，您可以命名;）

以下是他们概述的一个例子：

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 100.0f, 100.0f)];
[imageView setImageWithURL:[NSURL URLWithString:@"http://i.imgur.com/r4uwx.jpg"] placeholderImage:[UIImage imageNamed:@"placeholder-avatar"]];

如何下载＆amp;显示来自ftp服务器的图像

2 个答案: