问题
I have a NSString that may contain quotes,\, /, \r, \n, and I want to convert it to a JSON encoded string so strings like this
"text1\text2"
becomes
\"text1\\text2\"
Is there a existing function to let me do this?
Also, I am using SBJson in my project but I cannot find whether SBJson can do this or not.
NSJSONSerialization is not on the table since my application still needs to support OSX 10.6
回答1:
Does this answer your question?
-(NSString *)JSONString:(NSString *)aString {
NSMutableString *s = [NSMutableString stringWithString:aString];
[s replaceOccurrencesOfString:@"\"" withString:@"\\\"" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [s length])];
[s replaceOccurrencesOfString:@"/" withString:@"\\/" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [s length])];
[s replaceOccurrencesOfString:@"\n" withString:@"\\n" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [s length])];
[s replaceOccurrencesOfString:@"\b" withString:@"\\b" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [s length])];
[s replaceOccurrencesOfString:@"\f" withString:@"\\f" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [s length])];
[s replaceOccurrencesOfString:@"\r" withString:@"\\r" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [s length])];
[s replaceOccurrencesOfString:@"\t" withString:@"\\t" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [s length])];
return [NSString stringWithString:s];
}
Source: converting NSString to JSON string
回答2:
let's do it in more-native-JSON-way ;)
If u like my answer, please star me at https://github.com/wanjochan
//trick: id(@[s]) => string => trim [] => target
//NSString *s
s=[[NSString alloc] initWithData:
[NSJSONSerialization dataWithJSONObject:@[s] options:0 error:nil]
encoding:NSUTF8StringEncoding];
s=[[s substringToIndex:([s length]-1)] substringFromIndex:1];
回答3:
Swift 2:
/// Escape reserved characters to produce a valid JSON String
/// For example double quotes `"` are replaced by `\"`
/// - parameters:
/// - String: an unescaped string
/// - returns: valid escaped JSON string
func JSONString(str: String?) -> String? {
var result : String? = nil
if let str = str {
result = str
.stringByReplacingOccurrencesOfString("\"", withString: "\\\"", options: .CaseInsensitiveSearch)
.stringByReplacingOccurrencesOfString("/", withString: "\\/", options: .CaseInsensitiveSearch)
.stringByReplacingOccurrencesOfString("\n", withString: "\\n", options: .CaseInsensitiveSearch)
.stringByReplacingOccurrencesOfString("\u{8}", withString: "\\b", options: .CaseInsensitiveSearch)
.stringByReplacingOccurrencesOfString("\u{12}", withString: "\\f", options: .CaseInsensitiveSearch)
.stringByReplacingOccurrencesOfString("\r", withString: "\\r", options: .CaseInsensitiveSearch)
.stringByReplacingOccurrencesOfString("\t", withString: "\\t", options: .CaseInsensitiveSearch)
}
return result
}
Swift 3:
func JSONString(str: String) -> String {
var result = str
result = result.replacingOccurrences(of: "\"", with: "\\\"")
.replacingOccurrences(of: "/", with: "\\/")
.replacingOccurrences(of: "\n", with: "\\n")
.replacingOccurrences(of: "\u{8}", with: "\\b")
.replacingOccurrences(of: "\u{12}", with: "\\f")
.replacingOccurrences(of: "\r", with: "\\r")
.replacingOccurrences(of: "\t", with: "\\t")
return result
}
Very useful to prevent error: Domain=NSCocoaErrorDomain Code=3840 "Invalid escape sequence around character 123."
回答4:
Swift 4 Solution
extension String {
var stringEncodedJSON: String {
var copy = self
let encodingDict: [String: String] = ["\"": "\\\"", "/": "\\/", "\n": "\\n", "\u{8}": "\\b","\u{12}": "\\f", "\r": "\\r", "\t": "\\t"]
encodingDict.forEach({ copy = copy.replacingOccurrences(of: $0, with: $1) })
return copy
}
}
来源:https://stackoverflow.com/questions/15843570/objective-c-how-to-convert-nsstring-to-escaped-json-string