获取字符串中的数字

NSString * str = @"每日3/次 每次5/课";

NSCharacterSet *nonDigitCharacterSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];

 //获取字符串中的数字

str = [[str componentsSeparatedByCharactersInSet:nonDigitCharacterSet] componentsJoinedByString:@""];
  
 NSMutableArray *arr = [NSMutableArray array];
   for (NSInteger i = 0; i < str.length; i++) {
      char c = [str characterAtIndex:i];
       [arr addObject:[NSString stringWithFormat:@"%c", c]];
 }
   PHlog(@"________%@",arr[0]);
   PHlog(@"________%@",arr[1]);