我在几个星期后通过构建我自己的简单模板系统NSScanner
解决了这个问题。该方法使用模板系统来查找语法为${name}
的变量。变量通过NSDictionary
提供给方法。
- (NSString *)localizedStringFromTemplateString:(NSString *)string variables:(NSDictionary *)variables {
NSMutableString *result = [NSMutableString string];
// Create scanner with the localized string
NSScanner *scanner = [[NSScanner alloc] initWithString:NSLocalizedString(string, nil)];
[scanner setCharactersToBeSkipped:nil];
NSString *output;
while (![scanner isAtEnd]) {
output = NULL;
// Find ${variable} templates
if ([scanner scanUpToString:@"${" intoString:&output]) {
[result appendString:output];
// Skip syntax
[scanner scanString:@"${" intoString:NULL];
output = NULL;
if ([scanner scanUpToString:@"}" intoString:&output]) {
id variable = nil;
// Check for the variable
if ((variable = [variables objectForKey:output])) {
if ([variable isKindOfClass:[NSString class]]) {
// NSString, append
[result appendString:variable];
} else if ([variable respondsToSelector:@selector(description)]) {
// Not a NSString, but can handle description, append
[result appendString:[variable description]];
}
} else {
// Not found, localize the template key and append
[result appendString:NSLocalizedString(output, nil)];
}
// Skip syntax
[scanner scanString:@"}" intoString:NULL];
}
}
}
[scanner release];
return result;
}
凭借本地化文件看起来像这样:
"born message" = "I was born in ${birthYear} on a ${birthWeekDay}. ${byebye}";
"byebye" = "Cheers!";
我们可以实现以下结果...
NSDictionary *variables = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:1986], @"birthYear", @"monday", @"birthWeekDay", nil];
NSString *finalString [self localizedStringFromTemplateString:@"born message" variables:variables];
NSLog(@"%@", finalString); // "I was born in 1986 on a monday. Cheers!"
正如你所看到的,我已经添加了一些额外的功能太。首先,找不到任何变量(我的例子中的${byebye}
)将被本地化并附加到结果中。我这样做是因为我从我的应用程序包加载HTML文件,并通过localize方法运行它们(当这样做时,我不会在创建扫描仪时本地化输入字符串)。此外,我增加了发送其他内容的能力,而不仅仅是NSString
对象,因为它具有一些额外的灵活性。
这个代码也许不是最好的表演或漂亮编写的,但它的工作没有任何明显的性能影响:)
它根本不起作用,它returnes相同的字符串 – user2159978 2014-03-20 11:21:43
@ user2159978难道你真的只是复制最后一行? OF COURSE它会返回相同的字符串... – 2016-02-03 14:37:08