将UITextView / UITextField中的空格编码为URL格式 [英] Encoding spaces in UITextView / UITextField to URL format

问题描述

我正在尝试将UITextView或UITextField的内容作为参数发送到php文件

I'm trying to send the contents of UITextView or UITextField as parameters to a php file

NSString *urlstr = [[NSString alloc] initWithFormat:@"http://server.com/file.php?name=%@&tags=%@&entry=%@",nameField.text, tagsField.text, dreamEntry.text];

当我记录urlstr时，只要UITextView或UITextField没有，url格式就可以了包含空格。我如何将空格转换为％20？

When i log urlstr, the url format is ok just as long as the UITextView or UITextField don't contain spaces. How would i go about converting the spaces to %20 ?

编辑

这里是目前的代码，它不仅崩溃，而且还没有正确编码网址。

here is the code at present, which not only crashes but isn't encoding the url properly.

name = John Doe& tags = reurring nightmare& entry =测试测试测试

name=John Doe&tags=recurring nightmare&entry=Testing testing testing

转换为

name = John -1844684964oe& tags = recurringightmare& entry = Testing 4.214929e-307sting -1.992836e + 00sting

name=John -1844684964oe&tags=recurringightmare&entry=Testing 4.214929e-307sting -1.992836e+00sting

- (IBAction)sendButtonPressed:(id)sender
{

    NSString *urlString = [[NSString alloc] initWithFormat:@"http://server.com/file.php?name=%@&tags=%@&entry=%@", nameField.text, tagsField.text, dreamEntry.text];

    NSString *encodedString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSURL *url = [[NSURL alloc] initWithString:encodedString];

    NSLog(encodedString);

    NSLog(urlString);

    [urlString release];
    [url release];
    [encodedString release];


}

推荐答案

你不应该对整个字符串进行URL转义，你应该对动态组件进行URL转义。尝试

You're not supposed to URL-escape the entire string, you're supposed to URL-escape the dynamic components. Try

NSString *urlStr = [NSString stringWithFormat:@"http://server.com/file.php?name=%@&tags=%@&entry=%@",
                        [nameField.text stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
                        [tagsField.text stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
                        [dreamEntry.text stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
                        nil];
NSURL *url = [NSURL URLWithString:urlStr];

你的代码的第二个问题（毫无疑问是打印奇数的原因）是你要经过字符串直接到NSLog，因此它被视为格式字符串。你需要使用

The second issue with your code (and undoubtedly the reason for the odd printing) is you're passing the string directly to NSLog, so it's being treated as a format string. You need to use

NSLog(@"%@", encodedString);

。这将使它按预期打印。

instead. That will make it print as expected.

编辑：你的代码的第三个问题是你混合自动释放和拥有的对象，然后在最后释放它们。去看看你创建的3个对象，以及随后发布的对象。其中一个不应该在以后发布，因为它是由一个不以alloc，copy或new开头的方法生成的。识别有问题的对象是留给读者的一个练习。

A third issue with your code is you're mixing autoreleased and owned objects, then releasing them all at the end. Go look at the 3 objects you create, and which you subsequently release later. One of them shouldn't be released later because it was produced by a method that did not start with the words alloc, copy, or new. Identifying the object in question is an exercise left to the reader.

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