如何获得一个闪烁的按钮？ （两张交替图片） [英] How to get a blinking button? (two alternating pictures)

问题描述

我想要一个闪烁的按钮。实际上我的按钮看起来像这样：

I want a blinking button. Actually my button look like this:

[redButton setImage:[UIImage imageNamed:@"Button1.png"] forState: UIControlStateNormal];
[redButton setImage:[UIImage imageNamed:@"ButtonPressed.png"] forState: UIControlStateHighlighted];

现在我想从Button1.png到Button2.png每秒更改正常状态下的Buttonpicture并回到Button1.png等等......我怎么能这样做？

Now I want to change the Buttonpicture in the normal State every second from Button1.png to Button2.png and back to Button1.png and so on... How can I do this?

感谢您的帮助，对不起我的英语不好。

Thanks for your help and sorry for my bad English.

推荐答案

您可以通过安排NSTimer来更改图像：

You can change the image by scheduling a NSTimer:

NSTimer* timer = [NSTimer scheduledTimerWithTimeInterval: 1.0
                                         target: self
                                       selector: @selector(toggleButtonImage:)
                                       userInfo: nil
                                        repeats: YES];  

以下方法更改图片（您还需要一个bool实例变量来保持切换状态）

The following method changes the picture (you also need a bool instance variable to keep your toggle state)

- (void)toggleButtonImage:(NSTimer*)timer
{
    if(toggle)
    {
        [test setImage:[UIImage imageNamed:@"Button1.png"] forState: UIControlStateNormal];
    }
    else 
    {
        [test setImage:[UIImage imageNamed:@"ButtonPressed.png"] forState: UIControlStateNormal];
    }
    toggle = !toggle;
}

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