iOS 控件系列：UIActionSheet

UIActionsheet的简化版本，其实是放置在pop－over里面的，所以具备dismiss／／在空白处点击完成框消失

- (IBAction)doOtherThing:(id)sender {

    NSLog(@"imagine that this summons a popover");
}

- (IBAction)doButton:(id)sender {
    UIActionSheet* act = [[UIActionSheet alloc] 
                          initWithTitle:nil delegate:self cancelButtonTitle:nil 
                          destructiveButtonTitle:nil otherButtonTitles:@"Hey", @"Ho", nil];
   // [act showFromBarButtonItem:sender animated:YES];
    [act showFromRect:CGRectMake(100, 100, 10, 10) inView:self.view animated:YES];
}

// without this stuff, the toolbar buttons would be active while the action sheet popover is up
// comment them out and see
// however, the fact that this is necessary seems like a huge bug to me
 - (void)didPresentActionSheet:(UIActionSheet *)actionSheet {
    [self.toolbar setUserInteractionEnabled:NO];
}

- (void)actionSheet:(UIActionSheet *)actionSheet 
didDismissWithButtonIndex:(NSInteger)buttonIndex {
    //Sent to the delegate after an action sheet is dismissed from the screen... ... ...
    

    [self.toolbar setUserInteractionEnabled:YES];
    NSLog(@"pressed %i", buttonIndex);
}

代码简单，明了，没啥特别的：

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    // Override point for customization after application launch.

    self.window.rootViewController = [RootViewController new];

Action的外形需要自定义的不多，基本比较统一，主要是显示位置 

[act showFromBarButtonItem:sender animated:YES];
[act showFromRect:CGRectMake(100, 100, 10, 10) inView:self.view animated:YES];

act showFromTabBar:
act showFromToolBar:
act showInView:<#(UIView *)#>