转换为ARC时NSMakeCollectable出现问题 [英] Issue with NSMakeCollectable when converting to ARC

问题描述

我正在尝试将我的代码转换为ARC，而我在ASIRequest库中遇到NSMakeCollectable问题。

I am trying to convert my code to ARC and I have problem with NSMakeCollectable in the ASIRequest library.

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

它给了我这个错误： NSMakeCollectable不可用：自动引用计数不可用。

如何解决此问题？需要一些指导。谢谢。

How do I solve this? Need some guidance. Thanks.

编辑：
试过这个但没有工作：

Tried this and not working:

 - (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 @"";
    }

尝试过这个：

- (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 @"";
        }

推荐答案

NSMakeCollectable ARC中不再需要。您可以在此使用 CFBridgingRelease 。

NSMakeCollectable is no longer required in ARC. You can use CFBridgingRelease here.

- (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 @"";
}

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