?//去掉字符串中不要的字符

? ? NSString *str = @"今天天氣真好，探索一下NSCharacterSet";

? ? NSString*str1 =@"天氣";

? ? NSMutableString *resulStr = [[NSMutableString alloc]init];

? ? for(inti =0; i < str.length; i ++) {

? ? ? ? NSString*indexStr = [strsubstringWithRange:NSMakeRange(i,1)];

? ? ? ? if(![str1containsString:indexStr]) {

? ? ? ? ? ? [resulStrappendString:indexStr];

? ? ? ? }

?? ?}

? ? NSLog(@"常規(guī)寫法:%@",resulStr);

? ? //利用NSCharacterSet

? ? NSCharacterSet *characterSet = [NSCharacterSet characterSetWithCharactersInString:@"天氣"];

? ? NSArray *setArr = [str componentsSeparatedByCharactersInSet:characterSet];

?NSString*resultStr1 = [setArrcomponentsJoinedByString:@""];

? NSLog(@"拆分后的字符串?dāng)?shù)組--%@\n最終字符串--%@",setArr,resultStr1);