在前面的文章:[iOS]在WebApp中怎样使用JS调用iOS的函数 中,提到了怎样使用JS通过改动URL调用iOS的内部函数。
当中会遇到一个问题,就是编码问题。比方通过URL调用弹窗,在里面写上内容:你好汪海。
那链接大概就是这种:http://xxx.com#ios?action=alert¶m=你好汪海
可是在iOS中接收到的时候会出现中文的乱码:
http://xxx.com#ios?action=alert¶m=%25E6%2596%2587%25E4
遇到这个问题主要是URL在转化中的编码问题。解决方式感谢这篇博文:iOS中的编码问题。
将转码函数封装:
// 将URL编码
- (NSString *)encodeToPercentEscapeString: (NSString *) input
{
NSString *outputStr = (NSString *) CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
(CFStringRef)input,
NULL,
(CFStringRef)@"!*'();:@&=+$,/?
%#[]",
kCFStringEncodingUTF8));
return outputStr;
}
// 将URL解码
- (NSString *)decodeFromPercentEscapeString: (NSString *) input
{
NSMutableString *outputStr = [NSMutableString stringWithString:input];
[outputStr replaceOccurrencesOfString:@"+"
withString:@" "
options:NSLiteralSearch
range:NSMakeRange(0, [outputStr length])];
return [outputStr stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
}
演示一下上面的封装函数:
NSString * testUrl = @"http://search.google.com?keywords=($# it's {a*123})00!*'();:@&=+$,/?%#[]";
NSLog(@"original: %@", testUrl);
NSString * encodeStr = [self encodeToPercentEscapeString:testUrl];
NSLog(@"encoded: %@", encodeStr);
NSString * encodeStr2 = [testUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"encoded2:%@", encodeStr2);
NSString * decodeStr = [self decodeFromPercentEscapeString:encodeStr];
NSLog(@"decoded: %@", decodeStr);
结果例如以下:
>> original: http://search.google.com?
keywords=($# it's {a*123})00!*'();:@&=+$,/?%#[]
>> encoded: http%3A%2F%2Fsearch.google.com%3Fkeywords%3D%28%24%23%20it%27s%20%7Ba%2A123%7D%2900%21%2A%27%28%29%3B%3A%40%26%3D%2B%24%2C%2F%3F%25%23%5B%5D
>> encoded2: http://search.google.com?keywords=($%23%20it's%20%7Ba*123%7D)00!*'();:@&=+$,/?
%25%23%5B%5D
>> decoded: http://search.google.com?keywords=($# it's {a*123})00!*'();:@&=+$,/?
%#[]
演示一下自带的URL转码測试代码:
NSString* string1 = @"https://www.cloudsafe.com/目录";
NSString* string2 = [string1 stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString* string3 = [string2 stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString* string4 = [string2 stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString* string5 = [string3 stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString* string6 = [string4 stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString* string7 = [string5 stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"原始数据%@",string1);
NSLog(@"一层编码%@",string2);
NSLog(@"两层编码%@",string3);
NSLog(@"一层编码的一层解码%@",string4);
NSLog(@"两层编码的一层解码%@",string5);
NSLog(@"一层编码的两层解码%@",string6);
NSLog(@"两层编码的两层解码%@",string7);
打印结果:
2014-06-10 15:00:02.425 DareWayApp[7400:671651] 原始数据https://www.cloudsafe.com/目录
2014-06-10 15:00:02.426 DareWayApp[7400:671651] 一层编码https://www.cloudsafe.com/%E6%96%87%E4%BB%B6%E5%A4%B9
2014-06-10 15:00:02.427 DareWayApp[7400:671651] 两层编码https://www.cloudsafe.com/%25E6%2596%2587%25E4%25BB%25B6%25E5%25A4%25B9
2014-06-10 15:00:02.427 DareWayApp[7400:671651] 一层编码的一层解码https://www.cloudsafe.com/目录
2014-06-10 15:00:02.427 DareWayApp[7400:671651] 两层编码的一层解码https://www.cloudsafe.com/%E6%96%87%E4%BB%B6%E5%A4%B9
2014-06-10 15:00:02.427 DareWayApp[7400:671651] 一层编码的两层解码https://www.cloudsafe.com/目录
2014-06-10 15:00:02.427 DareWayApp[7400:671651] 两层编码的两层解码https://www.cloudsafe.com/目录
假设server用的是GBK编码,仅仅要把上面的UTF改成以下的encoding就能够了:
NSStringEncoding gbkEncoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
urlString = [urlString stringByReplacingPercentEscapesUsingEncoding:gbkEncoding];