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我正在尝试创建一个记忆游戏，但在某些时候我希望 UIbutton 上的图像被闪烁。对于 x 秒，我希望它们可见，对于 x 秒，我希望它们被隐藏。我被困住了，只想有人给我一个可行的算法。谢谢。

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2 回答 2

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基本方法是通过设置 alpha 来弹出和弹出视图。

UIView *view = imageView; // Or whatever
NSTimeInterval x = 2.0; // Or whatever

double delayInSeconds = x;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));

dispatch_after(popTime, dispatch_get_main_queue(), ^(void){ // Wait for x seconds to hide
    view.alpha = 0.0; // HIDE

    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){ // Wait for x seconds to show
        view.alpha = 1.0; // SHOW
    });
});

一种更具视觉吸引力的方法是在短时间内淡入和淡出图像视图。

UIView *view = imageView; // Or whatever
NSTimeInterval x = 2.0; // Or whatever
NSTimeInterval fadeInterval = 0.5; // Or whatever

double delayInSeconds = x;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));

dispatch_after(popTime, dispatch_get_main_queue(), ^(void){ // Wait for x seconds to hide
    [UIView animateWithDuration:fadeInterval animations:^{
        view.alpha = 0.0; // HIDE
    } completion:^(BOOL finished) {
        dispatch_after(popTime, dispatch_get_main_queue(), ^(void){ // Wait for x seconds to show
            [UIView animateWithDuration:fadeInterval animations:^{
                view.alpha = 1.0; // SHOW
            }];
        });
    }];
});

请参阅dispatch_after(3)、+animateWithDuration:animations:和+animateWithDuration:animations:completion:。

更新

好的。根据您的评论，我会让事情变得更简单。

第 1 步：使视图消失。这可以通过将 alpha（透明度）设置为 0、将 hidden 设置为 YES 或从其父视图中删除视图来完成。为了一个简单的效果，这次我将隐藏设置为YES。

view.hidden = YES;

第 2 步：让视图在设定的时间后消失。有很多方法可以做到这一点。我会坚持使用 dispatch_after()，但我会让它更容易理解。这一步有两个部分。a) 部分设置您希望视图隐藏的时间。b) 部分是隐藏视图。

// Part a) Set the time you want the view to disappear.
double howLongBeforeDisappearing = 2.0; // seconds
dispatch_time_t timeToDisappear = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(howLongBeforeDisappearing * NSEC_PER_SEC));

// Part b) Hide the view
dispatch_after(timeToDisappear, dispatch_get_main_queue(), ^{
    view.hidden = YES;
});

重要代码周围有很多东西，但重点是howLongBeforeDisappearing = 2.0和view.hidden = YES。这表示 2 秒后将 view.hidden 设置为 YES。

最后，我们需要扭转这一点，让事情重新出现。为此，我们执行完全相同的操作，只是这次我们将 view.hidden 设置为 NO。请记住，在设置重新出现的时间时，我们需要添加等待视图消失的时间。

// Part c) Set the time you want the view to reappear.
double howLongBeforeReappearing = howLongBeforeDisappearing + 2.0; // seconds
dispatch_time_t timeToReappear = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(howLongBeforeReappearing * NSEC_PER_SEC));

// Part d) Show the view
dispatch_after(timeToReappear, dispatch_get_main_queue(), ^{
    view.hidden = NO;
});

将所有这些加在一起，我们就有了最后的代码块。

// Part a) Set the time you want the view to disappear.
double howLongBeforeDisappearing = 2.0; // seconds
dispatch_time_t timeToDisappear = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(howLongBeforeDisappearing * NSEC_PER_SEC));

// Part b) Hide the view
dispatch_after(timeToDisappear, dispatch_get_main_queue(), ^{
    view.hidden = YES;
});

// Part c) Set the time you want the view to reappear.
double howLongBeforeReappearing = howLongBeforeDisappearing + 2.0; // seconds
dispatch_time_t timeToReappear = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(howLongBeforeReappearing * NSEC_PER_SEC));

// Part d) Show the view
dispatch_after(timeToReappear, dispatch_get_main_queue(), ^{
    view.hidden = NO;
});
于 2013-02-08T14:48:49.583 回答
0

这就是我让按钮闪烁的方式

-(void) blinkAll { [NSTimer scheduledTimerWithTimeInterval:.5 目标:self 选择器:@selector(hideBoxes) userInfo:nil repeats:NO];

[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(showBoxesCurrent) userInfo:nil repeats:NO];

[NSTimer scheduledTimerWithTimeInterval:1.5 target:self selector:@selector(hideBoxes) userInfo:nil repeats:NO];

[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(showBoxesCurrent) userInfo:nil repeats:NO];

[NSTimer scheduledTimerWithTimeInterval:2.5 target:self selector:@selector(hideBoxes) userInfo:nil repeats:NO];

[NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(showBoxesCurrent) userInfo:nil repeats:NO];

[NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(hideBoxes) userInfo:nil repeats:NO];

[NSTimer scheduledTimerWithTimeInterval:3.5 target:self selector:@selector(enableGamePlay) userInfo:nil repeats:NO];

}

showBoxesCurrent 和 hideBoxes 函数是获取所有按钮数组并将它们设置为隐藏或不隐藏的基本循环，由 NSTimer 函数激活。

于 2013-02-09T01:45:42.960 回答