调整视图大小以考虑工具栏

Question

如果创建基本ViewController并向视图添加不透明UIToolbar，如下所示：

UIViewController* viewController = [[UIViewController alloc] init];
[viewController.view setBackgroundColor:[UIColor blueColor]]; // To make it easy to see
self.window.rootViewController = viewController;

UIToolbar* toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, viewController.view.frame.size.height - 49, viewController.view.frame.size.width, 49)]; // At bottom. Height of 49
[toolbar setBarStyle:UIBarStyleBlack]; // Opaque and easy to see

[self.window.rootViewController.view addSubview:toolbar]; // Add toolbar to view controller

视图层次结构的结果如下：

我如何使视图控制器调整它的主要区域（蓝色部分），使其不会延伸到UIToolbar后面？

Answer 1

像这样试试

UIViewController* viewController = [[UIViewController alloc] init];
    [viewController.view setBackgroundColor:[UIColor blueColor]]; // To make it easy to see
    self.window.rootViewController = viewController;

UIToolbar* toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, viewController.view.frame.size.height - 49, viewController.view.frame.size.width, 49)]; // At bottom. Height of 49
[toolbar setBarStyle:UIBarStyleBlack]; // Opaque and easy to see

SecondViewController* secondChildVC = [self.storyboard instantiateViewControllerWithIdentifier:@"someId"];
[secondChildVC.view setBackgroundColor:[UIColor redColor]];
[viewController addChildViewController:secondChildVC];
[secondChildVC didMoveToParentViewController:viewController];
secondChildVC.view.frame = CGRectMake(0,0,viewController.view.frame.size.width,viewController.view.frame.size.height - 49);
[viewController.view addSubview:secondChildVC.view];

[self.window.rootViewController.view addSubview:toolbar];

Answer 2

尝试添加这行代码

viewController.edgesForExtendedLayout = UIRectEdgeNone;

这将使视图控制器的边不会向任何方向延伸。

或者，如果要扩展顶部、左侧和右侧，而不是底部，则可以添加此项。

viewController.edgesForExtendedLayout =  UIRectEdgeTop, UIRectEdgeLeft, UIRectEdgeRight;