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 1：NSArray 转换为 NSMutableArray

 NSArray *array = @[@"one",@"two"];

NSMutableArray *muArray = [NSMutableArray arrayWithArray:array];

2:NSDictionary  转换为 NSMutableDictionary

NSDictionary *dic = @{@"one":@"1",@"two":@"2"};

NSMutableDictionary *muDic = [NSMutableDictionary dictionaryWithDictionary:dic];

3:NSSet  转换为  NSMutableSet

NSSet *set = [[NSSet alloc]initWithObjects:@"one",@"two",nil];

NSMutableSet *muSet = [NSMutableSet setWithSet:set];

4:NSArray 转换成NSSet

NSMutableSet *muSet2 = [NSMutableSet setWithArray:array];

5:NSDictionary 转换成   NSArray

NSArray *allkeys = [dic allKeys];

NSArray *allvalues = [dic allValues];

6:字符串转换成数组

 NSString *str = @"www.china.com";

NSArray *strArray = [str componentSeparatedByString:@"."];  //以 .  作为分隔符

NSLog(@"%@",strArray);    // 打印为   (www,china,com)

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