不推荐使用 Objective-C 'CFURLCreateStringByAddingPercentEscapes'：首先在 iOS 9.0 中不推荐使用

Question

我收到了这个警告：

'CFURLCreateStringByAddingPercentEscapes' is deprecated: first deprecated in iOS 9.0 - Use [NSString stringByAddingPercentEncodingWithAllowedCharacters:] instead, which always uses the recommended UTF-8 encoding, and which encodes for a specific URL component or subcomponent (since each URL component or subcomponent has different rules for what characters are valid).

在这一行：

return (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)self, NULL, (CFStringRef)@"!*'\"();:@&=+$,/?%#[]% ", CFStringConvertNSStringEncodingToEncoding(encoding));

我试图用谷歌搜索解决方案，但我什么都不懂。请帮忙。

我尝试了以下方法：

return [NSString stringByAddingPercentEncodingWithAllowedCharacters:(NULL, (CFStringRef)self, (CFStringRef)@"!*'\"();:@&=+$,/?%#[]% ", CFStringConvertNSStringEncodingToEncoding(encoding))];

并收到了这个新警告：

Class method '+stringByAddingPercentEncodingWithAllowedCharacters:' not found (return type defaults to 'id')

和

Expression result unused

Answer 1

好的，我去试试：

- (NSString *)escaped
{
#if (TARGET_OS_MAC && (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_9))
    NSString * encodedString = (NSString *)
    CFURLCreateStringByReplacingPercentEscapes(
                                               NULL,
                                               (CFStringRef)self,
                                               NULL);
#else
    NSString * encodedString = (NSString *)
    CFURLCreateStringByAddingPercentEscapes(
        NULL,
        (CFStringRef)self,
        NULL,
        (CFStringRef)@"!*'();:@&=+$,/?%#[]",
        kCFStringEncodingUTF8 );
#endif
    return encodedString;
}