问题与NSMakeCollectable转换为ARC时(Issue with NSMakeColle

我想我的代码转换为ARC和我在ASIRequest库有问题，NSMakeCollectable。

- (NSString*)encodeURL:(NSString *)string
{
    NSString *newString = NSMakeCollectable([(NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding([self stringEncoding])) autorelease]);
    if (newString) {
        return newString;
    }
    return @"";
}

它给我这个错误： NSMakeCollectable is unavailable: not available in automatic reference counting 。

我该如何解决这个问题？需要一些指导。谢谢。

编辑：尝试这样做，不工作：

 - (NSString*)encodeURL:(NSString *)string
    {
        NSString *newString = NSMakeCollectable([(NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding([self stringEncoding])) autorelease]);
        if (newString) {
            return (__bridge_transfer NSString*)newString;
        }
        return @"";
    }

试过这还有：

- (NSString*)encodeURL:(NSString *)string
        {
            NSString *newString = NSMakeCollectable([(__bridge_transfer NSString*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding([self stringEncoding])) autorelease]);
            if (newString) {
                return newString;
            }
            return @"";
        }

NSMakeCollectable在ARC不再需要。您可以使用CFBridgingRelease这里。

- (NSString*)encodeURL:(NSString *)string
{
    NSString *newString = CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding([self stringEncoding])));
    // or  NSString *newString = (__bridge_transfer NSString*)(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding([self stringEncoding]));
    if (newString) {
        return newString;
    }
    return @"";
}