Xcode iPhone 编程:从 URL 将 jpg 加载到 UIImageView-移动开发问题

Xcode iPhone Programming: Loading a jpg into a UIImageView from URL(Xcode iPhone 编程:从 URL 将 jpg 加载到 UIImageView)

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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]];

此代码在视图的 viewdidload 中，但没有显示任何内容！服务器正在工作，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而改变！先感谢您.安东尼奥

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 image 变量，你可以通过它的 image 属性把它扔到 UIImageView 中，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];

如果您需要转义原始字符串中的特殊字符，您可以这样做:

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];
....

如果您以编程方式创建 UIImageView，您可以:

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

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

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