[IOS] Question about URL encoding when using JS to call iOS Functions

In the previous article: [iOS] How to Use JS to call iOS functions in WebApp, I mentioned how to use JS to call iOS Internal functions by modifying the URL.

One problem is the encoding problem. For example, if a pop-up window is called via URL, write the following content in it: Hello, Wang Hai.

The link is like this: http://xxx.com # ios? Action = alert & param = Hello, Wang Hai

However, Chinese garbled characters may appear when the message is received in iOS:

Http://xxx.com # ios? Action = alert & param = % 25E6% 2596% 2587% 25E4

This problem occurs mainly because of the encoding problem in URL conversion. Solution: thanks to this blog post: encoding problem in iOS.

Encapsulate transcoding functions:

// Encode the URL-(NSString *) encodeToPercentEscapeString: (NSString *) input {NSString * outputStr = (NSString *) CFBridgingRelease (partition (kCFAllocatorDefault, (CFStringRef) input, NULL, (CFStringRef )@"! * '();: @ & = + $ ,/? % # [] ", KCFStringEncodingUTF8); return outputStr;} // decodes the URL-(NSString *) encoding: (NSString *) input {NSMutableString * outputStr = [NSMutableString stringWithString: input]; [outputStr replaceOccurrencesOfString: @ "+" withString: @ "" options: NSLiteralSearch range: NSMakeRange (0, [outputStr length])]; return [outputStr failed: NSUTF8StringEncoding];}

Demonstrate the above encapsulated functions:

    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);

The result is as follows:

> Original: http://search.google.com? Keywords = ($ # it's {a * 123}) 00! * '();: @ & = + $ ,/? % # []
> Encoded: http % 3A % 2F % 2Fsearch.google.com % 3 Fkeywords % 3D % 28% 24% 23% 20it % 27 s % 20% 7Ba % 2A123% 7D % 2900% 2A % 21% 27% 28% 3B % 3A % 29% 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! * '();: @ & = + $ ,/? % # []

Demonstrate the built-in URL transcoding test code:

NSString * string1 = @ "string"; NSString * string2 = [string1 encoding: NSUTF8StringEncoding]; NSString * string3 = [string2 encoding: encoding]; NSString * string4 = [string2 encoding: required]; NSString * string5 = [string3 encoding: Required]; NSString * string6 = [string4 encoding: NSUTF8StringEncoding]; NSString * string7 = [string5 encoding: NSUTF8StringEncoding]; NSLog (@ "Raw data % @", string1); NSLog (@ "layer-1 encoding % @", string2); NSLog (@ "two-layer encoding % @", string3 ); NSLog (@ "layer-1 decoding % @", string4); NSLog (@ "layer-2 Decoding % @", string5 ); NSLog (@ "two-layer Decoding for one-layer encoding % @", string6); NSLog (@ "two-layer Decoding for two-layer encoding % @", string7 );

Print result:

15:00:02. 425 DareWayApp [7400: 671651]Raw DataHttps://www.cloudsafe.com/Folder

15:00:02. 426 DareWayApp [7400: 671651]Layer-1 encodingHttps://www.cloudsafe.com/%E6%96%87%E4%BB%B6%E5%A4%B9

15:00:02. 427 DareWayApp [7400: 671651]Two-layer encodingHttps://www.cloudsafe.com/%25E6%2596%2587%25E4%25BB%25B6%25E5%25A4%25B9

15:00:02. 427 DareWayApp [7400: 671651]Layer-1 DecodingHttps://www.cloudsafe.com/Folder

15:00:02. 427 DareWayApp [7400: 671651]Two-layer DecodingHttps://www.cloudsafe.com/%E6%96%87%E4%BB%B6%E5%A4%B9

15:00:02. 427 DareWayApp [7400: 671651]Two-layer DecodingHttps://www.cloudsafe.com/Folder

15:00:02. 427 DareWayApp [7400: 671651]Two-layer DecodingHttps://www.cloudsafe.com/Folder

If the server uses GBK encoding, you only need to change the above UTF to the following encoding:

 NSStringEncoding gbkEncoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);        urlString = [urlString stringByReplacingPercentEscapesUsingEncoding:gbkEncoding];