iPhone: nascondere/mostrare la barra degli strumenti

Question

Ho una barra degli strumenti nella parte superiore della mia vista con un pulsante Indietro. Vorrei quando la vista viene caricata per apparire con la barra degli strumenti nascosta e quindi, con un tocco del pulsante, per apparire animata.

--Modifica-- Non utilizzo un controller di navigazione.

Answer 1

Dato nuove informazioni - che non c'è UINavigationController - le cose sono diverse. Qui ci sono i bit rilevanti dal mio codice ...

Crea la barra di navigazione e aggiungerlo alla vostra vista:

// Create the navigation bar 

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

stenderlo ..

- (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; 
} 

creare una funzione a chi it/nasconderlo:

- (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; 
         } 
     ]; 
    } 
} 

dove

#define NAVBARHEIGHT 44 

Answer 2

Prima la vista viene mostrato:

[self.navigationController setToolbarHidden:YES]; 

Quando si preme il tasto:

[self.navigationController setToolbarHidden:NO]; 

Answer 3

Ecco alcuni codici di tarmes portati su 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; 
    }