Cocoa Touch中的程序化视图切换

我用 presentModalViewController:animated: 从主窗口打开设置视图 UIViewController 然后当用户在我调用的设置视图中按下“完成”时 dismissModalViewControllerAnimated: 从设置视图(返回父视图),如下所示:

[[self parentViewController] dismissModalViewControllerAnimated:YES];

你会想要探索 -[UIView addSubview:] 和 -[UIView removeFromSuperview] .你的基本窗口是 UIView (后代),因此您可以向其中添加和删除视图。

将通用UIView推入UINavigationController怎么样?

当您希望显示一个特定视图时,只需将其作为子视图添加到之前推送的UIView中即可。当您想更改视图时,请删除上一个子视图并添加新视图。

我发现了一个示例程序,它使用ModalView显示视图,而不将其嵌套为NavigatorControlView。

iPhone Nav Bar Demo

上面的示例链接使用modalView作为信息链接。还使用导航链接作为表视图链接。

NavBarDemo很有趣,但据我所知,最终modalView只是另一个从堆栈中弹出的视图。

对于像地图应用程序这样的情况,当用户开始键入地址时,地图视图会切换到列出搜索选项的表视图,该怎么办?这两个视图在启动时是否已经启动,搜索结果表视图是否刚刚设置为可见性0,当您键入时,它是否切换为1,或者它实际上是在文本字段的touchUpInside事件中加载的?

我将尝试使用UIView addSubview来重新创建此操作并发布我的结果

您可以使用以下方法:

BaseView.h-所有其他视图都继承自此视图:

@interface BaseView : UIView {}
@property (nonatomic, assign) UIViewController *parentViewController;
@end

BaseView。男性

@implementation BaseView
@synthesize parentViewController;

- (id)initWithFrame:(CGRect)frame {
    if ((self = [super initWithFrame:frame])) {
        // Initialization code
    }
    return self;
}

- (void)dealloc {
    [self setParentViewController:nil];
    [super dealloc];
}

@end

其他视图可以从BaseView继承。他们的代码应该有点像以下内容:

@implementation FirstView

- (id)initWithFrame:(CGRect)frame {
    if ((self = [super initWithFrame:frame])) {
        [self setBackgroundColor:[UIColor yellowColor]];

        UIButton *button1 = [[UIButton alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 200.0f, 30.0f)];
        [button1 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [button1 setBackgroundColor:[UIColor whiteColor]];
        [button1 setCenter:CGPointMake(160.0f, 360.0f)];
        [button1 setTitle:@"Show Second View" forState:UIControlStateNormal];
        [button1 addTarget:self action:@selector(switchView:) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:button1];
        [button1 release];      

        UIButton *button2 = [[UIButton alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 200.0f, 30.0f)];
        [button2 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [button2 setBackgroundColor:[UIColor whiteColor]];
        [button2 setCenter:CGPointMake(160.0f, 120.0f)];
        [button2 setTitle:@"Show Sub View" forState:UIControlStateNormal];
        [button2 addTarget:self action:@selector(showView:) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:button2];
        [button2 release];              
    }

    return self;
}

- (void)showView:(id)sender {
    if (viewController == nil) {
        viewController = [[SubViewController alloc] initWithNibName:nil bundle:nil];        
    }

    [self addSubview:viewController.view];
}

- (void)switchView:(id)sender {
    SecondView *secondView = [[SecondView alloc] initWithFrame:self.frame];
    [self.parentViewController performSelector:@selector(switchView:) withObject:secondView];
    [secondView release];
}

- (void)dealloc {
    [viewController release];
    [super dealloc];
}

@end

最后,所有视图都需要一个UIViewController。将调用switchView:方法来更改当前视图。UIViewController的代码可以是这样的:

@implementation ViewController

- (void)loadView {
    FirstView *firstView = [[FirstView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 480.0f)];    
    [firstView setParentViewController:self];
    [self setView:firstView];
    [firstView release];
}

- (void)switchView:(BaseView *)newView {
    [newView setParentViewController:self];
    [self retain];
    [self setView:newView];
    [self release];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

- (void)viewDidUnload {
    [super viewDidUnload];
}  

- (void)dealloc {
    [super dealloc];
}

@end

您可以在此处下载示例应用程序(在接下来的一个小时内): http://dl.dropbox.com/u/6487838/ViewSwitch.zip

这个提示是在 Apple's documentation ,但它并不重要。我发现自己很难理解它,而且它很简单。

只需将主窗口的rootViewController属性更改为拥有要显示的视图层次结构的任何视图控制器。事情就是这样简单。属性更新后,整个窗口内容将更改为新视图的内容。