iphone - 这个巨大的 if 语句感觉很不稳定......你会如何在 Objective C 中做到这一点

Question

for (NSString *metarComponent in self.readingComponents) {
    if ( [metarComponent hasPrefix:@"+"]
         || [metarComponent hasPrefix:@"-"]
         || [metarComponent hasPrefix:@"VC"]
         || [metarComponent hasPrefix:@"MI"]
         || [metarComponent hasPrefix:@"PR"])
         || [metarComponent hasPrefix:@"BC"])
         || [metarComponent hasPrefix:@"DR"])
         || [metarComponent hasPrefix:@"BL"])
         || [metarComponent hasPrefix:@"SH"])
         || [metarComponent hasPrefix:@"TS"])
         || [metarComponent hasPrefix:@"PZ"])
         || [metarComponent hasSuffix:@"DZ"])
         || [metarComponent hasSuffix:@"RA"])
         || [metarComponent hasSuffix:@"SN"])
         || [metarComponent hasSuffix:@"SG"])
         || [metarComponent hasSuffix:@"IC"])
         || [metarComponent hasSuffix:@"PL"])
         || [metarComponent hasSuffix:@"GR"])
         || [metarComponent hasSuffix:@"GS"])
         || [metarComponent hasSuffix:@"UP"])
         || [metarComponent hasSuffix:@"BR"])
         || [metarComponent hasSuffix:@"FG"])
         || [metarComponent hasSuffix:@"FU"])
         || [metarComponent hasSuffix:@"VA"])
         || [metarComponent hasSuffix:@"DU"])
         || [metarComponent hasSuffix:@"SA"])
         || [metarComponent hasSuffix:@"HZ"])
         || [metarComponent hasSuffix:@"PY"])
         || [metarComponent hasSuffix:@"PO"])
         || [metarComponent hasSuffix:@"SQ"])
         || [metarComponent hasSuffix:@"FC"])
         || [metarComponent hasSuffix:@"SS"])
         || [metarComponent hasSuffix:@"DS"]) {     
            [rawWeatherStrings addObject:metarComponent];
        }
}

Answer 1

我会创建一个 NSSet 前缀和一个 NSSet 后缀，然后在这些集合上使用 containsObject 将第一个字符(也是检查前缀集后的前两个字符)和最后两个字符从有问题的字符串中提取出来，以检查集合。查找将非常快。