小结：
NSArray有序的集合；
NSDictionary无序的集合，可排序； 增删改查
------NSArray-----------
create :
1)NSArray *array = [NSArray arrayWithObjects:@"Henry",@"Jones", @"Susan", @"Smith", @"Patty", @"Johnson", nil];
2)NSArray *myArray = [NSArray arrayWithArray:array];
NSLog(@"%@", myArray);
3) NSMutableArray *array = [[NSMutableArray alloc] initWithObjects: @"Foo", @"Bar", @"FooBar", nil];
4) NSMutableArray *array2 = [NSMutableArray arrayWithCapacity: 3];
//Add an object
[array2 addObject: @"Foo"];
//Add another object
[array2 addObject: @"Bar"];
//Insert an object at a particular index
[array2 insertObject: @"FooBar" atIndex: 1];
5) int n = 15;
NSMutableArray *numberArray = [[NSMutableArray alloc] initWithCapacity:n];
//srand(time(0));
srandom(time(NULL));
for(int i = 0; i < n; i++)
[numberArray addObject:[NSNumber numberWithInt:arc4random()%n]];
NSLog( @"%@", numberArray);
sort:
NSArray *sortedArray =
[array sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
---------dictionary--------------
NSArray *keys = [NSArray arrayWithObjects:@"key1", @"key2", @"key3", nil];
NSArray *objects = [NSArray arrayWithObjects:@"How", @"are", @"you", nil];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
//Case 1, loop through
for (id key in dictionary) {
NSLog(@"key: %@, value: %@", key, [dictionary objectForKey:key]);
}
//Case 2, loop through
NSEnumerator *enumerator;
id key;
enumerator = [dictionary keyEnumerator];
while ((key = [enumerator nextObject])){
NSLog(@"%@====>%@", key, [dictionary objectForKey:key]);
}
