如何在HTTP上将Last-Modified标头从HTTP响应正确转换为NSDate [英] How to properly convert the Last-Modified header from an HTTP response to an NSDate on iOS

问题描述

我正在寻找一个完全有效的解决方案，一个适用于：

I am looking for a fully working solution, one that works with:

• 任何iOS区域设置或时区


• 任何/大多数HTTP服务器


• Xcode 4.0.2 （查看原因）

• any iOS locale or timezone
• any/most HTTP servers
• Xcode 4.0.2 (see why)

当前破碎的代码：

 NSString lastModifiedString = @"Mon, 06 Jun 2011 12:47:05 GMT";
 NSDateFormatter *df = [[NSDateFormatter alloc] init];  
 //df.dateFormat = @"EEE',' dd MMM yyyy HH':'mm':'ss 'GMT'";
 df.dateFormat = @"EEE, dd MMM yyyy HH:mm:ss z";
 df.locale = [[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"] autorelease];  
 df.timeZone = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];  
 NSDate date = [df dateFromString:lastModifiedString];  

我认为假设 Last-Modified 使用与HTTP规范中的其他日期字段相同的格式，意味着使用RFC-1123 / RFC-822

I assumed that Last-Modified is supposed to use the same format like other date fields in HTTP spec, meaning to use RFC-1123 / RFC-822

资源：

• http：//www.w3 .org / Protocols / rfc2616 / rfc2616-sec14.html HTTP 1.1


• http://developer.apple.com/library/ios/#qa/qa1480/_index.html

• http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html HTTP 1.1
• http://developer.apple.com/library/ios/#qa/qa1480/_index.html

推荐答案

唯一不对的是你错过了星号 NSString 和 lastModifiedString ，以及 NSDate 和日期之间。一旦你把它们放进去，这段代码就适合我。

The only thing wrong is that you're missing asterisks in-between NSString and lastModifiedString, and also between NSDate and date. Once you put those in, this code works for me.

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