如何在UIBarButtonItem上激发高光效果 [英] How to fire hightlight effect on UIBarButtonItem

问题描述

当您点击 UIToolbar 中的 UIBarButtonItem 时，会出现白色发光效果.

When you tap on a UIBarButtonItem in a UIToolbar, there is a white glow effect.

是否可以触发一个事件来显示这种效果?

我不想按按钮.仅应显示效果.我想向用户显示，此按钮后面有新内容.

I don't want to press the button. Only the effect should be displayed. I want to visualize to the user, that there is new content behind this button.

感谢您的帮助！

推荐答案

以下方法假定您正在使用导航控制器的toolbarItems属性，并且要突出显示的按钮是该数组中的最后一项.当然，您可以将其应用于任何工具栏，并在必要时选择其他数组索引.

The following method assumes you are using the toolbarItems property of a navigation controller and that the button you want to highlight is the last item in that array. You can apply it to any toolbar, of course, and pick a different array index if necessary.

现在这还不是很完美，因为动画从屏幕的左下角移动了新按钮.但是，我认为可以通过一点努力将其关闭.

Right now this is not exactly perfect, because the animation moves the new button from the lower left of the screen. However, I think that can be turned off with a little effort.

请注意，我使用了PeakJi的图像.

Note that I used PeakJi's image.

我希望这对您有用.

享受，

达明(Damien)

- (void)highlightButton {
    NSArray *originalFooterItems = self.toolbarItems;
    NSMutableArray *footerItems = [originalFooterItems mutableCopy];
    [footerItems removeLastObject];

    NSString* pathToImageFile = [[NSBundle mainBundle] pathForResource:@"white_glow" ofType:@"png"];
    UIImage* anImage = [UIImage imageWithContentsOfFile:pathToImageFile];
    UIImageView *imageView = [[UIImageView alloc] initWithImage:anImage];
    imageView.frame = CGRectMake(0, 0, 40, 40);

    UIBarButtonItem *flashImage = [[UIBarButtonItem alloc] initWithCustomView:imageView];
    [footerItems addObject:flashImage];

    [UIView animateWithDuration:0.3
                          delay: 0.0
                        options: UIViewAnimationOptionCurveEaseOut
                     animations:^{
                         self.toolbarItems = footerItems;                     }
                     completion:^(BOOL finished){
                         [UIView animateWithDuration:.3
                                               delay: 0.0
                                             options:UIViewAnimationOptionCurveEaseIn
                                          animations:^{
                                              self.toolbarItems = originalFooterItems;
                                          }
                                          completion:nil];
                     }];
}

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