NSString - API

substringWithRange:NSRange

substringFromIndex:NSInteger

substringToIndex:NSInteger

containsString:NSString

hasSuffix:NSString是否有后缀

hasPrefix:NSString是否有前缀

(NSRange) rangeOfString:NSString 子字符串在字符串中的位置

(NSString) stringByAppendingString:NSString

(NSString) stringByAppendingPathComponent:NSString

(NSString)stringByAppendingFormat:@"%@,%@",str1,str2...

(NSString) lowercaseString转成小写

(NSString) uppercaseString以大写字母开头

(NSString) capitalizedString转成大写

(NSData) dataUsingEncoding: NSUTF8StringEncoding NSSTring->NSData

(NSString)stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]剪掉头尾指定字符

(NSArray)componentsSeparatedByString:NSString以某字符串分割字符串

(NSString)stringByReplacingOccurrencesOfString:NSString withString:NSString替换指定字符串

writeToFile: NSString atomically:YES encoding:NSUTF8StringEncoding

stringWithContentsOfFile:NSString(FilePath)encoding:NSUTF8StringEncoding error: error
从文件中读取字符串

caseInsensitiveCompare:NSString不区分大小写比较