UITabBar视图编程方式来选择抽头上
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20-08-2019 - |
题
我有一个导航控制器基于应用程序。我决定在我的应用程序中使用标签栏。
当在一定的选项卡栏项用户按下欲显示某个视图控制器 - 我想以编程在我的代码选择要显示的一个
我试图在界面生成器导航控制器添加到我的标签栏,但其视图控制器viewWillAppear中不被调用。
我怎样才能实现这个功能?
解决方案
我不知道这是否是“正道”,但在这里是如何我通常有三个选项卡做到这一点。
- (void)initControls {
// Create the window.
[self setWindow:[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]];
// Create Tab Bar.
tabCon = [[UITabBarController alloc] init];
// Local array variable that holds the viewcontrollers.
// Capacity corresponds to the number of VC's
NSMutableArray *localVCArray = [[NSMutableArray alloc] initWithCapacity:3];
MyFirstViewController *oneViewController = [[MyFirstViewController alloc] init];
UINavigationController *oneNavCon = [[UINavigationController alloc] initWithRootViewController:oneViewController];
[localVCArray addObject:oneNavCon];
[oneViewController release];
[oneNavCon release];
MySecondViewController *twoViewController = [[MySecondViewController alloc] init];
UINavigationController *twoNavCon = [[UINavigationController alloc] initWithRootViewController:twoViewController];
[localVCArray addObject:twoNavCon];
[twoViewController release];
[twoNavCon release];
MyThirdViewController *threeViewController = [[MyThirdViewController alloc] init];
UINavigationController *threeNavCon = [[UINavigationController alloc] initWithRootViewController:threeViewController];
[localVCArray addObject:threeNavCon];
[threeViewController release];
[threeNavCon release];
// Set the tab bars array of view controllers to the localVCArray
[[self tabCon] setViewControllers:localVCArray animated:YES];
// Release the localVCArray, all of its contents are now retained by tabCon.
[localVCArray release];
// Add controls to window and show.
[window addSubview:[tabCon view]];
[window makeKeyAndVisible];
}
在init方法每个的viewController可以这样做:
[[self tabBarItem] setImage:[dataSource tabConImg]];
[[self tabBarItem] setTitle:[dataSource name]];
[[self navigationItem] setTitle:[dataSource navConName]];
要设置在标签栏使用的图标,在标签栏的标题,并且您导航项目的标题。
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