Call the sharedMenuController class method of UIMenuController to get the global menu-controller instance.
Compute the boundaries of the selection and with the resulting rectangle call the setTargetRect:inView: method. The edit menu is displayed above or below this rectangle, depending how close the selection is to the top or bottom of the screen.
Call the setMenuVisible:animated: method (with YES for both arguments) to animate the display of the edit menu above or below the selection.

　　Displaying the edit menu:

 1 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
 2     UITouch *theTouch = [touches anyObject];
 3  
 4     if ([theTouch tapCount] == 2  && [self becomeFirstResponder]) {
 5  
 6         // selection management code goes here...
 7  
 8         // bring up edit menu.
 9         UIMenuController *theMenu = [UIMenuController sharedMenuController];
10         CGRect selectionRect = CGRectMake (currentSelection.x, currentSelection.y, SIDE, SIDE);
11         [theMenu setTargetRect:selectionRect inView:self];
12         [theMenu setMenuVisible:YES animated:YES];
13  
14     }
15 }

View Code

　　Before the menu is displayed, however, the system sends a canPerformAction:withSender: message to the first responder, which in many cases is the custom view itself.

　　Conditionally enabling menu commands:

 1 - (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
 2     BOOL retValue = NO;
 3     ColorTile *theTile = [self colorTileForOrigin:currentSelection];
 4  
 5     if (action == @selector(paste:) )
 6         retValue = (theTile == nil) &&
 7              [[UIPasteboard generalPasteboard] containsPasteboardTypes:
 8              [NSArray arrayWithObject:ColorTileUTI]];
 9     else if ( action == @selector(cut:) || action == @selector(copy:) )
10         retValue = (theTile != nil);
11     else
12         retValue = [super canPerformAction:action withSender:sender];
13     return retValue;
14 }

View Code

　　Implementing a Change Color menu item:

 1 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {}
 2 - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {}
 3 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
 4     UITouch *theTouch = [touches anyObject];
 5     if ([theTouch tapCount] == 2) {
 6         [self becomeFirstResponder];
 7         UIMenuItem *menuItem = [[UIMenuItem alloc] initWithTitle:@"Change Color" action:@selector(changeColor:)];
 8         UIMenuController *menuCont = [UIMenuController sharedMenuController];
 9         [menuCont setTargetRect:self.frame inView:self.superview];
10         menuCont.arrowDirection = UIMenuControllerArrowLeft;
11         menuCont.menuItems = [NSArray arrayWithObject:menuItem];
12         [menuCont setMenuVisible:YES animated:YES];
13     }
14 }
15 - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {}
16  
17 - (BOOL)canBecomeFirstResponder { return YES; }
18  
19 - (void)changeColor:(id)sender {
20     if ([self.viewColor isEqual:[UIColor blackColor]]) {
21         self.viewColor = [UIColor redColor];
22     } else {
23         self.viewColor = [UIColor blackColor];
24     }
25     [self setNeedsDisplay];
26 }

View Code

　　Dismiss the Edit Menu:

1 [UIMenuController sharedMenuController].menuVisible = YES;

posted on 2014-02-27 18:12 Tekkaman 阅读(281) 评论(0) 编辑收藏举报

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