添加視圖控制器
// add child viewController
UIViewController* controller =[[UIViewController alloc]init];
[self addChildViewController:controller];
controller.view.frame = CGRectMake(0, 44, WIDHT, HEIGHT - 44);
[self.view addSubview:controller.view];
[controller didMoveToParentViewController:self];
刪除視圖控制器
// remove child viewController
UIViewController *vc = [self.childViewControllers lastObject];
[vc.view removeFromSuperview];
[vc removeFromParentViewController];
常用手勢
UIPanGestureRecognizer（拖動）
UIPinchGestureRecognizer（捏合）
UIRotationGestureRecognizer（旋轉(zhuǎn)）
UITapGestureRecognizer（點(diǎn)按）
UILongPressGestureRecognizer（長按）
?UISwipeGestureRecognizer（輕掃）
消除最后一根分割線
cell.separatorInset = UIEdgeInsetsMake(0, 0, 0, cell.bounds.size.width);
dispatch_group_t group = dispatch_group_create();
dispatch_group_async(group, dispatch_get_global_queue(0,0), ^{
//線程一
});
dispatch_group_async(group, dispatch_get_global_queue(0,0), ^{
// 線程二
});
dispatch_group_notify(group, dispatch_get_global_queue(0,0), ^{
//匯總
});
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