iOS 5：使NSString类别包括NSCFConstantString？ [英] iOS 5: Make NSString Category include NSCFConstantString?

问题描述

我有一个 NSString 类别类（ NSString + URLEncoding.h ）。
我遇到了未知的选择器崩溃，因为我调用类别方法的字符串已被iOS优化为 NSCFConstantString 。

I have an NSString category class (NSString+URLEncoding.h). I am running into and unknown selector crash, because the string I am calling the category method has been optimized into an NSCFConstantString by iOS.

-[__NSCFConstantString URLEncodedString]: unrecognized selector sent to instance 0x290174

我从iOS中了解到了 NSCFConstantString 与 NSCFString 的优化：
http://www.cocoanetics.com/2012/03/beware-of- nsstring-optimizations /

I learned of the NSCFConstantString vs. NSCFString optimizations in iOS 5 from: http://www.cocoanetics.com/2012/03/beware-of-nsstring-optimizations/

有谁知道如何让NSString类别包含Constant字符串甚至强制var为 NSString / NSCFString 而不是 NSCFConstantString ？

Is anyone aware of how I can get the NSString category to include the Constant strings or even force the var to be an NSString/NSCFString and not an NSCFConstantString?

干杯，
Z

Cheers, Z

-edit -

-edit-

• 链接器标记 -ObjC -all_load 都已实现


• NSString + URLEncoding.m包含目标编译源中的ded


• NSString + URLEncoding.m实现了URLEncodedString方法。


• 检查僵尸。

• Linker flags -ObjC -all_load are both already implemented
• NSString+URLEncoding.m is included in the targets compile sources
• NSString+URLEncoding.m implements the URLEncodedString method.
• Checked for zombies.

我正在为ShareKit 2.0添加共享服务

I am adding a sharing service to ShareKit 2.0

标题：

@interface NSString (OAURLEncodingAdditions)

- (NSString *)URLEncodedString;

实施：

@implementation NSString (OAURLEncodingAdditions)

- (NSString *)URLEncodedString 
{
    NSString *result = (NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                                                           (CFStringRef)self,
                                                                           NULL,
                                                                           CFSTR("!*'();:@&=+$,/?%#[]"),
                                                                           kCFStringEncodingUTF8);
    [result autorelease];
    return result;
}

推荐答案

链接器存在问题这可能导致其死代码剥离完全省略任何只包含obj-c类别（或其他未引用的）的目标文件。从理论上将 -ObjC 标志传递给链接器应该解决这个问题，但这似乎并不总是有效。您可以通过提供 -all_load 链接器标志来解决此问题，这将导致链接器始终链接到所有目标文件。

There's an issue with the linker that can cause its dead-code stripping to completely omit any object files that only contain obj-c categories (or that are otherwise unreferenced). Theoretically passing the -ObjC flag to the linker should fix this, but that doesn't seem to always work. You can work around this issue by providing the -all_load linker flag, which will cause the linker to always link in all object files.

请注意，如果您的类别是您所包含的子项目或库的一部分，则可能必须在父项目上设置 -all_load 。

Note that you might have to set -all_load on the parent project if your category is part of a sub-project or library that you-re including somewhere.

更新：我相信 -ObjC 现在已经可靠并且已经存在多年了您可以针对此问题停止使用 -all_load 。

Update: I believe -ObjC is reliable now and has been for years so you can stop using -all_load for this issue.

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