iPhone UIButton翻轉和展開

Question

我想做一個簡單的按鈕，更改大小和展開，然後收縮後續點擊。

它有點作用，翻蓋後的最後一個按鈕看起來是正確的 - 它是圓形和不同的大小。問題是在轉換過程中，我得到了這種奇怪的非循環效應。查看此鏈接以查看此問題 - >http://screencast.com/t/rJaSJ0nGq。

我該如何使過渡平滑並始終看起來是圓形的？我不希望在屏幕錄像中出現圓角矩形外觀。

這裏是我的按鈕點擊方法：

// Handle when a user presses the button 
- (IBAction)bubblePressed:(id)sender { 

    // Expand the bubble if it's pressed or de-expand it if 
    // already expanded 
    if (buttonResized) { 

     CGRect tempFrame=self.expandMe.frame; 
     tempFrame.size.width=100;//change acco. how much you want to expand 
     tempFrame.size.height=100; 
     [UIView beginAnimations:@"" context:nil]; 
     [UIView setAnimationDuration:BUTTON_FLIP_TIME]; 
     self.expandMe.frame=tempFrame; 

     // Round the buttons 
     self.expandMe.clipsToBounds = YES; 
     self.expandMe.layer.cornerRadius = self.expandMe.frame.size.width/2;//half of the width 
     self.expandMe.layer.borderColor=[UIColor clearColor].CGColor; 
     self.expandMe.layer.borderWidth=2.0f; 

     // Flip the button 
     [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.expandMe cache:YES]; 

     [UIView commitAnimations]; 

    } 
    else { 

     CGRect tempFrame=self.expandMe.frame; 
     tempFrame.size.width=200;//change acco. how much you want to expand 
     tempFrame.size.height=200; 
     [UIView beginAnimations:@"" context:nil]; 
     [UIView setAnimationDuration:BUTTON_FLIP_TIME]; 
     self.expandMe.frame=tempFrame; 

     // Round the buttons 
     self.expandMe.clipsToBounds = YES; 
     self.expandMe.layer.cornerRadius = self.expandMe.frame.size.width/2;//half of the width 
     self.expandMe.layer.borderColor=[UIColor clearColor].CGColor; 
     self.expandMe.layer.borderWidth=2.0f; 

     // Flip the button 
     [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.expandMe cache:YES]; 

     [UIView commitAnimations]; 

    } 

    // Flip the variable that tracks flipping 
    buttonResized = !buttonResized; 

} 

Answer 1

在我發現這個結尾 - >https://github.com/ole/OBShapedButton。這是一個偉大的課程，並獲得MIT許可