iphone - 有没有办法为 UITabBarItem 使用自定义选定的图像？

Question

当用户在选项卡栏上选择一个项目时，我喜欢有一个自定义选择的图像，默认情况下它选择蓝色，但希望有绿色。像下面这样有什么想法吗？

Answer 1

刚刚找到了我的解决方案。基本上，我对 UITabItem 进行子类化并在导航 Controller 中设置它:

-(void) viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];

    CustomTabBarItem *tabItem = [[CustomTabBarItem alloc] initWithTitle:@"Events" image:[UIImage imageNamed:@"tabIcon.png"] tag:0];
    tabItem.customHighlightedImage=[UIImage imageNamed:@"tabIconSelected.png"];
    self.tabBarItem = tabItem;
    [tabItem release];
    tabItem=nil;            
}

这是 CustomTabBarItem 类的样子:

@interface CustomTabBarItem : UITabBarItem
{
    UIImage  *customHighlightedImage;
}

@property (nonatomic, retain) UIImage *customHighlightedImage;

@end

实现:

#import "CustomTabBarItem.h

@implementation CustomTabBarItem

@synthesize customHighlightedImage;

- (void)dealloc {
    [customHighlightedImage release];
    customHighlightedImage=nil;
    [super dealloc];
}

-(UIImage *)selectedImage {
    return self.customHighlightedImage;
}

@end