NSString

NSObject

• NSMutableString

• Objective-c iPhone percent encode a string?
  • http://stackoverflow.com/questions/3423545/objective-c-iphone-percent-encode-a-string The iOS 7 SDK now has a better alternative tostringByAddingPercentEscapesUsingEncoding that does let you specify that you want all characters escaped except certain allowed ones. It works well if you are building up the URL in parts:

    NSString * unescapedQuery = [[NSString alloc] initWithFormat:@"?myparam=%d", numericParamValue];
    NSString * escapedQuery = [unescapedQuery stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    NSString * urlString = [[NSString alloc] initWithFormat:@"http://ExampleOnly.com/path.ext%@", escapedQuery];

• C言語の文字const char *とObjectiveCの文字列NSStringの変換
  • http://d.hatena.ne.jp/eidolon/20121125

    NSString *str = @"abc";
    const char *p = [str UTF8string];

char str_c[100];
strcpy(str_c,"abc");
NSString *str = [ [ NSString alloc ] initWithUTF8String:str ];