Xcode iPhone编程：从URL将jpg加载到UIImageView中 [英] Xcode iPhone Programming: Loading a jpg into a UIImageView from URL

问题描述

我的应用程序必须从http服务器加载图像并将其显示到UIImageView

我该怎么做？

我试过这个：

My app has to load an image from a http server and displaying it into an UIImageView
How can i do that??
I tried this:

NSString *temp = [NSString alloc];
[temp stringwithString:@"http://192.168.1.2x0/pic/LC.jpg"]
temp=[(NSString *)CFURLCreateStringByAddingPercentEscapes(
    nil,
    (CFStringRef)temp,                     
    NULL,
    NULL,
    kCFStringEncodingUTF8)
autorelease];


NSData *dato = [NSData alloc];
 dato=[NSData dataWithContentsOfURL:[NSURL URLWithString:temp]];
 pic = [pic initWithImage:[UIImage imageWithData:dato]];

此代码位于视图的viewdidload中，但不显示任何内容！
服务器正在运行，因为我可以从中加载xml文件。但我无法显示该图像！

我需要以编程方式加载图像，因为它必须根据传递的参数进行更改！
提前谢谢你。
Antonio

This code is in viewdidload of the view but nothing is displayed! The server is working because i can load xml files from it. but i can't display that image!
I need to load the image programmatically because it has to change depending on the parameter passed! Thank you in advance. Antonio

推荐答案

应该是：

NSURL * imageURL = [NSURL URLWithString:@"http://192.168.1.2x0/pic/LC.jpg"];
NSData * imageData = [NSData dataWithContentsOfURL:imageURL];
UIImage * image = [UIImage imageWithData:imageData];

一旦你有了图像变量，可以通过它的图像属性将它扔进 UIImageView ，即：

Once you have the image variable, you can throw it into a UIImageView via it's image property, ie:

myImageView.image = image;
//OR
[myImageView setImage:image];

如果你需要转义原始字符串中的特殊字符，你可以这样做：

If you need to escape special characters in your original string, you can do:

NSString * urlString = [@"http://192.168.1.2x0/pic/LC.jpg" stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
NSURL * imageURL = [NSURL URLWithString:urlString];
....

如果您正在创建 UIImageView 以编程方式执行：

If you're creating your UIImageView programmatically, you do:

UIImageView * myImageView = [[UIImageView alloc] initWithImage:image];
[someOtherView addSubview:myImageView];
[myImageView release];

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