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我正在尝试创建一个动画管理器类，它将为我处理递归动画。它正在工作，但不可靠。例如，有时，当使用它时，动画就像“背靠背”一样发生，它们之间没有延迟。其他时候使用它时，动画之间会留下延迟（这发生在位于其他视图控制器上的其他元素上）

这是我的代码：

@implementation customAnimationTimer

-(id) initWithTimeInterval:(NSTimeInterval)timeInterval target:(UIView*)target animationType:(NSInteger)animationType
              fromValue:(CGFloat)fromValue toValue:(CGFloat)toValue withDelegate:(id <customAnimationTimerDelegate>)delegate {

    if (self = [super init]) {
        self.delegate = delegate;
        _timeInterval = timeInterval;
        _target = target;
        _animationState = NO;
        _animationType = animationType;
        _fromValue = fromValue;
        _toValue = toValue;

        _displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(displayLinkFire)];
        [_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
    }
    return self;
}

-(void) displayLinkFire {if (self.delegate) [self.delegate displayLinkUpdate:self];}

@end


@implementation animationManager


static animationManager* sharedHelper = nil;

+ (animationManager*) sharedInstance {
    if (!sharedHelper) sharedHelper = [[animationManager alloc] init];
    return sharedHelper;
}


-(id) init { if (self = [super init]) {[self initArrays];} return self;}

-(void) initArrays {
    _activeTimers = [NSMutableArray arrayWithObjects: nil];
}

-(void) displayLinkUpdate:(customAnimationTimer*)timer {
    if (timer.displayLink.frameInterval != 1) [self animateWithTimer:timer];
    timer.displayLink.frameInterval = (timer.timeInterval/timer.displayLink.duration);
}

-(void) animateWithTimer:(customAnimationTimer*)timer {
    if (!timer.animationState) {

        timer.animationState = true;
        [UIView animateWithDuration:timer.timeInterval animations:^{
           if (timer.animationType == 0) timer.target.alpha = timer.toValue;
        }];

    } else {

        timer.animationState = false;
        [UIView animateWithDuration:timer.timeInterval animations:^{
            if (timer.animationType == 0) timer.target.alpha = timer.fromValue;
        }];

    }
}

-(void) addAnimationToView:(UIView*)view withType:(int)animationType fromValue:(CGFloat)fromValue toValue:(CGFloat)toValue withTime:(CGFloat)time  {
    [_activeTimers addObject: [[customAnimationTimer alloc] initWithTimeInterval:time target:view animationType:animationType fromValue:fromValue toValue:toValue withDelegate:self]];
}

-(void) removeAnimationFromView:(UIView*)view {

    NSInteger index = 900000000;
    for (customAnimationTimer* timer in _activeTimers) {
        if (timer.target == view) {
            index = [_activeTimers indexOfObject:timer];
            [timer.displayLink invalidate];
        }
    }

    if (index != 900000000) [_activeTimers removeObjectAtIndex:index];

}

-(void) removeAnimations {
    for (customAnimationTimer* timer in _activeTimers) [timer.displayLink invalidate];
    [self initArrays];
}


@end
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2 回答 2

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您可能正在模拟器中进行测试。不。CADisplayLink 在模拟器中完全不可靠。如果您要使用 CADisplayLink，请仅在设备上进行测试。

您的代码的另一个问题是您永远不应该假设 CADisplayLink 将多久触发一次。它不会定期触发。始终查看以了解它何时timestamp真正触发，并据此计算您的动画“帧”。

在我自己的代码中的这个例子中，我调用了动画0的第一个“帧”和整个动画的最后一个“帧” 1。因此，我可以通过将时间戳与总持续时间进行比较来计算动画的正确“帧”。我在一些实例变量中维护状态。以下是显示链接触发时发生的情况：

if (self->_timestamp < 0.01) { // pick up and store first timestamp
    self->_timestamp = sender.timestamp;
    self->_frame = 0.0;
} else { // calculate frame
    self->_frame = (sender.timestamp - self->_timestamp) * SCALE;
}
// ... redraw here ...
if (self->_frame > 1.0) {
    [sender invalidate];
    self->_frame = 0.0;
    self->_timestamp = 0.0;
}
于 2014-04-02T19:23:12.133 回答
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嗯，录下来，并排播放两个录音，确实是我的眼睛在捉弄我！其中一个是蓝色背景，另一个是红色背景，我想这与它有关！我向让我困惑的人道歉！

于 2014-04-02T20:19:56.957 回答