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我试图将环境变量替换为一个字符串,但是我被regularExpresionWithPattern
停滞了。将环境变量替换为NSString
我发现了另一个问题,一些代码,似乎回答别人的问题,但因为种种原因,并没有为我工作:
NSString *substituteVariables(NSString *input) {
NSDictionary *environment = [[NSProcessInfo processInfo] environment];
NSError *error = nil;
// I know this pattern isn't good enough, but it's a start!
NSRegularExpression *regex = [NSRegularExpression
regularExpressionWithPattern:@"$([A-Z_]+)"
options:NSRegularExpressionCaseInsensitive error:&error];
return [regex stringByReplacingMatchesInString:input options:0
range:NSMakeRange(0, input.length)
usingBlock:^NSString *(NSTextCheckingResult *result,
NSMatchingFlags flags, BOOL *stop) {
NSString *envKey = [input substringWithRange:[result rangeAtIndex:1]];
return [environment objectForKey:envKey];
}];
};
这会产生一个编译器警告这在很大程度上表明,码赢没有工作:
appbundler/native/main.m:64:19: warning: instance method '-stringByReplacingMatchesInString:options:range:usingBlock:' not found (return type defaults to 'id') [-Wobjc-method-access]
return [regex stringByReplacingMatchesInString:input options:0 range:NSMakeRange(0, input.length) usingBlock:^NSString *(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSRegularExpression.h:25:12: note: receiver is instance of class declared here
@interface NSRegularExpression : NSObject <NSCopying, NSCoding> {
^
1 warning generated.
虽然代码有望与10.7 SDK一起工作,但我正在针对OS 10.8 SDK进行构建。
我检查了文档,并且确实在文档中不存在此方法。然而,它以某种方式为别人工作,我不明白为什么。
orz所以它毕竟是一个自定义的方法。我不是特别想要这个代码库膨胀,所以我可能只是内联。 – Trejkaz