添加徽章圖標以圓形矩形按鈕？

Question

有沒有一種方便的方法來製作帶有徽章的按鈕？不在圖標上...我想在應用程序內執行此操作。程序選擇了徽章的按鈕或圖像。或者我必須建立一個photoshop圖像庫？

Answer 1

如果沒有photoshop圖像庫，您需要使用resizableImageWithCapInsets來實現此目的。有一些很好的線索（here和here）解釋了它的用法。

這是我剛纔給你一個想法的例子：

//Create a label (width/height not important at this stage) 
UILabel *yourLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 1, 1)]; 
yourLabel.text = @"7+"; 
[yourLabel sizeToFit]; 

CGRect labelFrame = yourLabel.frame; 

//Here we create a UIImage that is resizable, but will not resize the areas concerned with the cap insets you've defined 
UIImage *badgeImage = [[UIImage imageNamed:@"badge.png"]resizableImageWithCapInsets:UIEdgeInsetsMake(5, 5, 5, 5)]; 
UIImageView *badgeImageView = [[UIImageView alloc]initWithImage:badgeImage]; 

badgeImageView.contentMode = UIViewContentModeScaleToFill; 
badgeImageView.backgroundColor = [UIColor clearColor]; 

labelFrame.size.width += 5; //This is the 'padding' on the right and left (added together) 
//If your badge edges are completely circular then you don't want to change the height, but if they're not then go ahead in the same way with the width. If your badge has a static height, you'll need to make sure the font size doesn't exceed this height; better start off with a small font-size 

badgeImageView.frame = labelFrame; //The badge is now the right width with padding taken into account 

//Center the label on the badge image view 
yourLabel.center = CGPointMake(badgeImageView.frame.size.width/2, badgeImageView.frame.size.height/2); 

//Finally we add the label to the badge image view 
[badgeImageView addSubview:yourLabel]; 
//Add your badge to the main view 
[self.view addSubview:badgeImageView]; 

[badgeImageView release]; 
[yourLabel release]; 

Answer 2

UILabel *lbl_notification_count = [[UILabel alloc]initWithFrame:CGRectMake(5,0, 18, 18)]; 

     lbl_notification_count.textColor = [UIColor whiteColor]; 

     lbl_notification_count.textAlignment = NSTextAlignmentCenter; 

     lbl_notification_count.text = [NSString stringWithFormat:@"%d",appDel.NotificationBadge]; 

     lbl_notification_count.adjustsFontSizeToFitWidth=YES; 

     lbl_notification_count.layer.borderWidth = 1; 

     lbl_notification_count.layer.cornerRadius = lbl_notification_count.layer.frame.size.height/2; 

     lbl_notification_count.layer.masksToBounds = YES; 

     lbl_notification_count.layer.borderColor =[[UIColor colorWithRed:241.0/255.0 green:84.0/255.0 blue:67.0/255.0 alpha:1.0] CGColor]; 

     lbl_notification_count.backgroundColor = [UIColor colorWithRed:241.0/255.0 green:84.0/255.0 blue:67.0/255.0 alpha:1.0]; 

     lbl_notification_count.font = CustomFontMediumWithSize(12); 

     if (appDel.NotificationBadge >= 1) { 

      [btnNotification addSubview:lbl_notification_count]; 

      [lbl_notification_count setHidden:NO]; 

     }else{ 

      [lbl_notification_count setHidden:YES]; 

     }