cocoa的一些新变化

  NSUserActivity
  NSUserActivity *activity = [[NSUserActivity alloc] 
  		initWithActivityType:@"com.company.somegame.playing"];
  activity.userInfo = @{@"Level":@1,@"Location":@"Start",@"Score":@0};
  activity.title = @"playing some game";
  [activity becomeCurrent];

  @property (weak) id target;

  Swift
  @property NSRect frame;
  var frame : NSRect

  @property (readonly, strong) NSStoryboard *storyboard;
  var storyboard : NSStoryboard! {get}

  @property (copy) NSArray *subviews;
  var subviews : AnyObject[]!

  NSString
  - (BOOL)containsString:(NSString *)str;
  - (BOOL)localizedCaseInsensitiveContainsString:(NSString *)str;