- (void)viewDidLoad {  [super viewDidLoad];  // Do any additional setup after loading the view, typically from a nib.  //直接排序對象  NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:nil ascending:YES];  NSArray *descriptors = [NSArray arrayWithObject:descriptor];  NSArray *myDataArray = [NSArray arrayWithObjects:@"what", @"xero", @"highligth", @"mountain", @"Victory", @"Balance", nil];  NSLog(@"---myDataArray---%@",myDataArray);  NSArray *resultArray = [myDataArray sortedArrayUsingDescriptors:descriptors];  NSLog(@"%@", resultArray);  //NSArray 使用sortedArrayUsingDescriptors，返回排序好的數組。  //NSMutableArray可以直接使用sortUsingDescriptors，對數組本身排序。}

2015-10-23 11:56:45.178 對數組進行排序[6739:168615] (  Balance,  Victory,  highligth,  mountain,  what,  xero)