iOS关于/的坑

今天和服务端对接的时候遇到两个和 “/”（斜杠）有关的坑。

一、encode相关

NSString 的 stringByAddingPercentEscapesUsingEncoding 可以对 url 参数进行编码，但不会对所有字符都编码，比如说 “/”

//    encodedUrl为/test/test
NSString *testString = @"/test/test";
NSString *encodedUrl = [testString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

解决方案：

//    encodedUrl为%2Ftest%2Ftest

NSString *testString = @"/test/test";

NSString *charactersToEscape = @"?!@#$^&%*+,:;='\"`<>()[]{}/\\| ";
    NSCharacterSet *allowedCharacters = [[NSCharacterSet characterSetWithCharactersInString:charactersToEscape] invertedSet];
NSString *encodedUrl = [testString stringByAddingPercentEncodingWithAllowedCharacters:allowedCharacters];

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二、Json相关

系统NSJSONSerialization序列化，会转义”/”为”\/”。

解决方案：

NSData *bodyData = [NSJSONSerialization dataWithJSONObject:@{@"m":@"/test/test"} options:self.writingOptions error:error];
NSString *jsonString = [[NSString alloc] initWithData:bodyData encoding:NSUTF8StringEncoding];
jsonString = [jsonString stringByReplacingOccurrencesOfString:@"\\" withString:@""];
[jsonString dataUsingEncoding:NSUTF8StringEncoding];