關於 iOS 不受支持的 URL 編碼問題

之前使用的副程式，遇到 iOS 9 已被停用，xcode 提示我請改用 stringByAddingPercentEncodingWithAllowedCharacters。

修改前副程式：

- (NSString*)escapePath:(NSString*)url
{
 CFStringEncoding encoding = CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding);
 NSString *escapedPath =
 (__bridge NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
 (CFStringRef)url,
 NULL,
 (CFStringRef)@":?=,!$&'()*+;[]@#~",
 encoding);

修改後副程式：

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