iPhone: ocultar/mostrar la barra de herramientas

Question

Tengo una barra de herramientas en la parte superior de mi vista con un botón Atrás. Me gustaría que la vista cargue para aparecer con la barra de herramientas oculta y luego, con un toque del botón, aparezca animado.

- Editar - No estoy usando un controlador de navegación.

Answer 1

dado nueva información - que no hay UINavigationController - las cosas son diferentes. Aquí están los bits correspondientes de mi código ...

Crear la barra de navegación y añadirla a la vista:

// Create the navigation bar 

self.navBar = [[UINavigationBar alloc] init]; 
[self.view addSubview:self.navBar]; 

ponerlo hacia fuera ..

- (CGRect)frameForOrientation:(UIInterfaceOrientation)theOrientation 
{ 
    UIScreen *screen = [UIScreen mainScreen]; 
    CGRect fullScreenRect = screen.bounds;  // always implicitly in Portrait orientation. 
    CGRect appFrame = screen.applicationFrame; 

    // Find status bar height by checking which dimension of the applicationFrame is narrower than screen bounds. 
    // Little bit ugly looking, but it'll still work even if they change the status bar height in future. 
    float statusBarHeight = MAX((fullScreenRect.size.width - appFrame.size.width), (fullScreenRect.size.height - appFrame.size.height)); 

    // Initially assume portrait orientation. 
    float width = fullScreenRect.size.width; 
    float height = fullScreenRect.size.height; 

    // Correct for orientation. 
    if (UIInterfaceOrientationIsLandscape(theOrientation)) { 
     width = fullScreenRect.size.height; 
     height = fullScreenRect.size.width; 
    } 

    // Account for status bar, which always subtracts from the height (since it's always at the top of the screen). 
    height -= statusBarHeight; 

    return CGRectMake(0, statusBarHeight, width, height); 
} 

- (CGSize)viewSizeForOrientation:(UIInterfaceOrientation)theOrientation 
{ 
    CGRect frame = [self frameForOrientation:theOrientation]; 
    return CGSizeMake(frame.size.width, frame.size.height); 
} 

- (void)layoutSubviewsForInterfaceOrientation:(UIInterfaceOrientation)theOrientation withAnimation:(BOOL)animate 
{ 
    CGSize fullSize = [self viewSizeForOrientation:theOrientation]; 
    float width = fullSize.width; 
    float height = fullSize.height; 

    CGRect newFrame = CGRectMake(0, 0, width, height); 
    SubViewController *controller; 
    UIView *theView; 

    // Place the navigation bar 

    CGRect navBarFrame = newFrame; 
    navBarFrame.size.height = NAVBARHEIGHT; 
    self.navBar.frame = navBarFrame; 
} 

crear una función para que se it/ocultarlo:

- (void)showNavigationBar:(BOOL)show 
{ 
    if (show == YES && self.navBar.hidden == YES) { 

     // Move the frame out of sight 
     CGRect frame = self.navBar.frame; 
     frame.origin.y = -frame.size.height; 
     self.navBar.frame = frame; 

     // Display it nicely 
     self.navBar.hidden = NO; 
     frame.origin.y = 0.0; 
     [self.view bringSubviewToFront:self.navBar]; 

     [UIView animateWithDuration:0.3 
         animations:^(void) { 
          self.navBar.frame = frame; 
         } 
     ]; 
    } 
    else if (show == NO && self.navBar.hidden == NO) { 

     CGRect frame = self.navBar.frame; 

     // Display it nicely 
     frame.origin.y = -frame.size.height; 
     [self.view bringSubviewToFront:self.navBar]; 

     [UIView animateWithDuration:0.3 
         animations:^(void) { 
          self.navBar.frame = frame; 
         } 
         completion:^(BOOL finished) { 
          self.navBar.hidden = YES; 
         } 
     ]; 
    } 
} 

donde

#define NAVBARHEIGHT 44 

Answer 2

Antes se muestra la vista:

[self.navigationController setToolbarHidden:YES]; 

Cuando se pulsa el botón:

[self.navigationController setToolbarHidden:NO]; 

Answer 3

Aquí hay parte del código de Tarmes portado a MonoTouch/C#.

public static RectangleF FrameForOrientation(UIInterfaceOrientation orientation) { 
     var screen = UIScreen.MainScreen; 
     var fullScreenRect = screen.Bounds;  // always implicitly in Portrait orientation. 
     var appFrame = screen.ApplicationFrame; 

     // Find status bar height by checking which dimension of the applicationFrame is narrower than screen bounds. 
     // Little bit ugly looking, but it'll still work even if they change the status bar height in future. 
     var statusBarHeight = Math.Max((fullScreenRect.Width - appFrame.Width), (fullScreenRect.Height- appFrame.Height)); 

     // Initially assume portrait orientation. 
     var width = fullScreenRect.Width; 
     var height = fullScreenRect.Height; 

     // Correct for orientation. 
     if (IsLandscapeOrientation(orientation)) { 
      width = fullScreenRect.Height; 
      height = fullScreenRect.Width; 
     } 

     // Account for status bar, which always subtracts from the height (since it's always at the top of the screen). 
     height -= statusBarHeight; 

     return new RectangleF(0, statusBarHeight, width, height); 
    } 

    public static SizeF SizeForOrientation(UIInterfaceOrientation orientation) { 
     var frame = FrameForOrientation(orientation); 
     return new SizeF(frame.Width, frame.Height); 
    } 


    public static bool IsLandscapeOrientation(UIInterfaceOrientation orientation) { 
     return 
      orientation == UIInterfaceOrientation.LandscapeLeft || 
      orientation == UIInterfaceOrientation.LandscapeRight; 
    }