[英]How to load and unload a UIViewController from the window
I have create some logic when the app is loaded that I can load from 3 different views depending on some values I set in my plist. 加载应用程序时,我已经创建了一些逻辑,可以根据在plist中设置的一些值从3个不同的视图中加载。
This is what my code looks like 这就是我的代码
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//sets context for coredata
CoreDataController *coreDataController = [CoreDataController sharedManager];
coreDataController.managedObjectContext = self.managedObjectContext;
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
PrefsController *prefsController = [[PrefsController alloc] init];
NSDictionary *prefsDictionary = [prefsController readPrefs];
NSLog(@"%@", prefsDictionary);
NSString *projectListBoolString = [prefsDictionary objectForKey:@"ProjectListAvailable"];
NSString *installsBoolString = [prefsDictionary objectForKey:@"InstallsAvailable"];
NSString *finishinBoolString = [prefsDictionary objectForKey:@"FinishingAvailable"];
if (([projectListBoolString isEqualToString:@"T"]) && ([installsBoolString isEqualToString:@"F"]) && ([finishinBoolString isEqualToString:@"F"])) {
self.getProjectListViewController = [[GetProjectListViewController alloc] initWithNibName:@"GetProjectListViewController" bundle:nil];
self.window.rootViewController = self.getProjectListViewController;
[self.window makeKeyAndVisible];
}
else if (([projectListBoolString isEqualToString:@"T"]) && ([installsBoolString isEqualToString:@"T"]) && ([finishinBoolString isEqualToString:@"T"])) {
self.currentProjectListViewController = [[CurrentProjectListViewController alloc] initWithNibName:@"CurrentProjectListViewController" bundle:nil];
self.window.rootViewController = self.currentProjectListViewController;
[self.window makeKeyAndVisible];
}
else {
self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
}
return YES;
}
I would like to be able to then load and unload UIViewControllers (including removing from memory by using buttons presses etc. 我希望能够然后加载和卸载UIViewControllers(包括通过使用按键等从内存中删除)。
I dont want to use a navigaiton based controller as I want the views to be static or individual if that makes more sense. 我不想使用基于导航的控制器,因为如果这样更合理,我希望视图是静态的或独立的。
If someone could show me some example code to load a new UIViewController to the window and remove the old UIViewController that would be greatly apprecaited. 如果有人可以向我展示一些示例代码,以将新的UIViewController加载到窗口中并删除将不胜枚举的旧版UIViewController。
However I am not sure of the correct was to handle this, or even how the code looks. 但是我不确定是正确的,还是代码的外观。
any help would be greatly appreciated. 任何帮助将不胜感激。
For me, is not a good way to load your view like this. 对我来说,这不是加载您的视图的好方法。 It would be better to load a rootViewController in your AppDelegate and add your current view depending of your plist inside the
RootViewController
: 最好在AppDelegate中加载rootViewController并根据
RootViewController
中的plist添加当前视图:
AppDelegate AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
RootViewController *rootViewController = [[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil];
self.window.rootViewController = rootViewController;
[self.window makeKeyAndVisible];
return YES;
}
After in your RootViewController
add a subview of the current view depending on your plist : 在
RootViewController
之后,根据您的plist添加当前视图的子视图:
RootViewController.m RootViewController.m
#pragma mark - View management
- (void)viewDidLoad
{
[super viewDidLoad];
NSDictionary *prefsDictionary = [prefsController readPrefs];
NSLog(@"%@", prefsDictionary);
NSString *projectListBoolString = [prefsDictionary objectForKey:@"ProjectListAvailable"];
NSString *installsBoolString = [prefsDictionary objectForKey:@"InstallsAvailable"];
NSString *finishinBoolString = [prefsDictionary objectForKey:@"FinishingAvailable"];
if (([projectListBoolString isEqualToString:@"T"]) && ([installsBoolString isEqualToString:@"F"]) && ([finishinBoolString isEqualToString:@"F"])) {
self.getProjectListViewController = [[GetProjectListViewController alloc] initWithNibName:@"GetProjectListViewController" bundle:nil];
// Add View Controller
[self.view addSubview:self.getProjectListViewController.view
}
else if (([projectListBoolString isEqualToString:@"T"]) && ([installsBoolString isEqualToString:@"T"]) && ([finishinBoolString isEqualToString:@"T"])) {
self.currentProjectListViewController = [[CurrentProjectListViewController alloc] initWithNibName:@"CurrentProjectListViewController" bundle:nil];
// Add View Controller
[self.view addSubview:self.currentProjectListViewController.view];
}
else {
self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
// Add View Controller
[self.view addSubview:self.viewController.view];
}
}
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