如何更改Popover的外观

我不这么认为……我一直在搜索互联网试图解决同样的问题。现在看来,黑色是唯一的选择。

下面是如何显示简单弹出窗口的示例,这些弹出窗口将在几秒钟后显示动画并消失。头文件:

@interface ViewPopup : UIView 
{
  IBOutlet UILabel *m_lblMessage;
}
@property (nonatomic, retain) UILabel *m_lblMessage;
- (void) showFromView: (UIView*)viewParent;

实施部分:

@implementation ViewPopup
@synthesize m_lblMessage;
- (void) showFromView: (UIView*)viewParent
{
  [viewParent addSubview:self];
  [self setCenter: CGPointMake(viewParent.frame.size.width/2, -self.frame.size.height/2)];
  [UIView beginAnimations: @"ShowPopup" context: nil];
  [UIView setAnimationDuration: 0.5];
  [UIView setAnimationDelegate: self];
  [UIView setAnimationDidStopSelector: @selector(onAppeared)];
  self.transform = CGAffineTransformMakeTranslation(0, self.frame.size.height+40);
  [UIView commitAnimations];
}
- (void) onAppeared
{
  [self performSelector: @selector(hide) withObject: nil afterDelay: 3];
}
- (void) hide
{
  [UIView beginAnimations: @"HidePopup" context: nil];
  [UIView setAnimationDuration: 1];
  [UIView setAnimationDelegate: self];
  [UIView setAnimationDidStopSelector: @selector(removeFromSuperview)];
  self.transform = CGAffineTransformIdentity;
  [UIView commitAnimations];
}
- (void)dealloc 
{
  [m_lblMessage release];
  [super dealloc];
}

从任何视图和代码中的任何位置调用:

ViewPopup *viewPopup = (ViewPopup*)[[NSBundle mainBundle] getViewFromNib: @"ViewPopup" class: [ViewPopup class] owner: nil];
viewPopup.m_lblMessage.text = @"Hello";
[viewPopup showFromView: someView];

请注意,弹出图形是从viewpopup.xib文件加载的。它只有一些图形和文本标签。