Question

不使用Cocos2D或其他框架，我想让一些UIButtons按顺序闪烁，每个UIButtons间隔1秒。但是只有第一个闪烁！任何建议都将受到高度赞赏。

-(void)pressTimerButton{

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

[timer fire];
}

- (void) timerFires{

ComputerStringsArray_A=[[NSMutableArray alloc]init];
[ComputerStringsArray_A addObject:@"1"];
[ComputerStringsArray_A addObject:@"2"];
[ComputerStringsArray_A addObject:@"3"];
[ComputerStringsArray_A addObject:@"4"];
[ComputerStringsArray_A addObject:@"5"];

NoElementsInMutableArray = [ComputerStringsArray_A count];

NSString *ReadString = ComputerStringsArray_A[increment];

if      ([ReadString isEqualToString:one])   {Button = Button_01;}
else if ([ReadString isEqualToString:two])   {Button = Button_02;}
else if ([ReadString isEqualToString:three]) {Button = Button_03;}
else if ([ReadString isEqualToString:four])  {Button = Button_04;}
else if ([ReadString isEqualToString:five])  {Button = Button_05;}
else if ([ReadString isEqualToString:six])   {Button = Button_06;}
else if ([ReadString isEqualToString:seven]) {Button = Button_07;}
else if ([ReadString isEqualToString:eight]) {Button = Button_08;}
else if ([ReadString isEqualToString:nine])  {Button = Button_09;}

[self FlashButton];

increment++;

//Don't try to flash a button beyond the length of the array
if (increment > NoElementsInMutableArray-1)
{
[timer invalidate];
timer = nil;
}
}

-(void) FlashButton
//- (void)FlashButton:(id)anElement
{
self.Button.alpha = 1.0f;
[UIView animateWithDuration:0.18
                      delay:0.7
                    options:
 UIViewAnimationOptionCurveEaseInOut |
 //UIViewAnimationOptionRepeat |
 UIViewAnimationOptionAutoreverse |
 UIViewAnimationOptionAllowUserInteraction

                 animations:^{
                     self.Button.alpha = 0.02f;
                 }
                 completion:^(BOOL finished){

                     //At the end of the flashing return opacity to 100% and color to white
                     self.Button.alpha = 1.0f;
                     Button.backgroundColor = [UIColor whiteColor];
                 }];
}

Answer 1

这有助于解决您的问题吗？

- (void) animateButtonSequence {

    NSString *ReadString = ComputerStringsArray_A[increment];

    UIButton * buttonToFlash;

    if      ([ReadString isEqualToString:one])   {buttonToFlash = Button_01;}
    else if ([ReadString isEqualToString:two])   {buttonToFlash = Button_02;}
    else if ([ReadString isEqualToString:three]) {buttonToFlash = Button_03;}
    else if ([ReadString isEqualToString:four])  {buttonToFlash = Button_04;}
    else if ([ReadString isEqualToString:five])  {buttonToFlash = Button_05;}
    else if ([ReadString isEqualToString:six])   {buttonToFlash = Button_06;}
    else if ([ReadString isEqualToString:seven]) {buttonToFlash = Button_07;}
    else if ([ReadString isEqualToString:eight]) {buttonToFlash = Button_08;}
    else if ([ReadString isEqualToString:nine])  {buttonToFlash = Button_09;}

    // Perhaps easier to just have an array of your buttons?
    // All the above code would just be

    UIButton * buttonToFlash = btnsArray[increment];

    [UIView animateWithDuration:0.15
                          delay:0.0
                        options:UIViewAnimationOptionCurveLinear
                     animations:^{

                         // button flash animation

                     } completion:^(BOOL finished) {
                         if (finished) {
                             increment = increment + 1;
                             if (increment == ComputerStringsArray_A.count) {
                                 increment = 0;

                                 // done animating, proceed here

                             }
                             else {
                                 [self performSelector:@selector(animateButtonSequence) withObject:self afterDelay:1.0];
                             }
                         }
                     }];
}

这样您就不必跟踪计时器了。

Answer 2

我建议在数组中使用所有按钮，而不是尝试执行字符串比较来做出决定。例如：

buttonArray = [[NSMutableArray alloc] initWithObjects:button_01,button_02,button_03,button_04,button_05,button_06,button_07,button_08,button_09, nil];

然后在启动计时器时启动一个整数计数器（声明为类的实例变量）。您的timerFires代码变得更加简单。

- (void) timerFires{
    Button = [buttonArray objectAtIndex:counter];
    [self flashButton];
    counter++;
    if(counter == buttonArray.count){
        [timer invalidate];
        timer = nil;
    }
}

在此过程中，您不会丢失对按钮的引用，也不会占用任何额外的内存。

编辑：好的，这是我在我的一个项目中实现类似功能的。代码肯定有效 - 我刚检查过它。

- (void) animateKeyboardButton{
    if(counter>0)
        ((UIButton*)[keyboard objectAtIndex:counter - 1]).alpha = 1.0f;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.3];
    if(counter <keyboard.count)
        ((UIButton*) [keyboard objectAtIndex:counter]).alpha = 0.2f;
    [UIView commitAnimations];
    counter ++;
    if(counter == keyboard.count+1){
        [timer invalidate];
        timer = nil;
        counter = 0;
    }
}
- (void) animateKeyboardWithInterval: (float) interval{
    counter = 0;
    timer = [NSTimer scheduledTimerWithTimeInterval:interval target:self selector:@selector(animateKeyboardButton) userInfo:nil repeats:YES];
    [timer fire];
}

这是我的一个项目的代码，它有一个28键的键盘，存储在NSMutableArray对象中。动画在这里完美运作。希望这会有所帮助。

如何使按钮以编程方式按顺序闪烁

2 个答案: