IOS UserAgent的使用原理和获取,设置方法

http请求头里面一般都会有User-Agent字段，用来让服务器获取到设备信息，从而建立不同的数据库表

NSString *sysUA = request.allHTTPHeaderFields[@"User-Agent"];

一般根据服务端的需要，我们可以通过以下方法往请求头里面塞入你想要的值

[request setValue:@"字段对应的值1" forHTTPHeaderField:@"你头部的字段1"];

以下是我们自己封装的User-Agent数据:

+ (NSString *)defaultUserAgentString

{

NSBundle *bundle = [NSBundle bundleForClass:[self class]];

// Attempt to find a name for this application

NSString *appName = [bundle objectForInfoDictionaryKey:@"CFBundleDisplayName"];

if (!appName) {

appName = [bundle objectForInfoDictionaryKey:@"CFBundleName"];

}

NSData *latin1Data = [appName dataUsingEncoding:NSUTF8StringEncoding];

appName = [[NSString alloc] initWithData:latin1Data encoding:NSISOLatin1StringEncoding];

// If we couldn't find one, we'll give up (and ASIHTTPRequest will use the standard CFNetwork user agent)

if (!appName) {

return nil;

}

NSString *appVersion = nil;

NSString *marketingVersionNumber = [bundle objectForInfoDictionaryKey:@"CFBundleShortVersionString"];

NSString *developmentVersionNumber = [bundle objectForInfoDictionaryKey:@"CFBundleVersion"];

if (marketingVersionNumber && developmentVersionNumber) {

if ([marketingVersionNumber isEqualToString:developmentVersionNumber]) {

appVersion = marketingVersionNumber;

} else {

appVersion = [NSString stringWithFormat:@"%@ rv:%@",marketingVersionNumber,developmentVersionNumber];

}

} else {

appVersion = (marketingVersionNumber ? marketingVersionNumber : developmentVersionNumber);

}

NSString *deviceName;

NSString *OSName;

NSString *OSVersion;

NSString *locale = [[NSLocale currentLocale] localeIdentifier];

#if TARGET_OS_IPHONE

UIDevice *device = [UIDevice currentDevice];

deviceName = [device model];

OSName = [device systemName];

OSVersion = [device systemVersion];

#else

deviceName = @"Macintosh";

OSName = @"Mac OS X";

// From http://www.cocoadev.com/index.pl?DeterminingOSVersion

// We won't bother to check for systems prior to 10.4, since ASIHTTPRequest only works on 10.5+

OSErr err;

SInt32 versionMajor, versionMinor, versionBugFix;

err = Gestalt(gestaltSystemVersionMajor, &versionMajor);

if (err != noErr) return nil;

err = Gestalt(gestaltSystemVersionMinor, &versionMinor);

if (err != noErr) return nil;

err = Gestalt(gestaltSystemVersionBugFix, &versionBugFix);

if (err != noErr) return nil;

OSVersion = [NSString stringWithFormat:@"%u.%u.%u", versionMajor, versionMinor, versionBugFix];

#endif

// Takes the form "My Application 1.0 (Macintosh; Mac OS X 10.5.7; en_GB)"

return  [NSString stringWithFormat:@"%@ %@ (%@; %@ %@; %@)", appName, appVersion, deviceName, OSName, OSVersion, locale];

}