似乎有可能会有更好的方法。如果你没有太多的图像,我可能只是建议使用的UIImageView
animationImages
属性,然后startAnimating
:
NSArray *images = @[[UIImage imageNamed:@"0.jpg"],
[UIImage imageNamed:@"1.jpg"],
[UIImage imageNamed:@"2.jpg"],
[UIImage imageNamed:@"3.jpg"],
[UIImage imageNamed:@"4.jpg"],
[UIImage imageNamed:@"5.jpg"],
[UIImage imageNamed:@"6.jpg"],
[UIImage imageNamed:@"7.jpg"]];
self.imageView.image = images[0];
self.imageView.animationImages = images;
self.imageView.animationDuration = kAnimationDuration;
self.imageView.animationRepeatCount = 1;
[self.imageView startAnimating];
[UIView animateWithDuration:kAnimationDuration
animations:^{
self.imageView.center = ... // set this to whatever you want
}];
如果您担心加载所有这一切到内存中,你也可以使用一个CADisplayLink
来加载图像作为适当的,像下面这样:
- (void)animateImageUsingDisplayLink
{
self.imageNames = @[@"0.jpg",
@"1.jpg",
@"2.jpg",
@"3.jpg",
@"4.jpg",
@"5.jpg",
@"6.jpg",
@"7.jpg"];
self.imageView.image = [UIImage imageNamed:self.imageNames[0]];
[self startDisplayLink];
[UIView animateWithDuration:kAnimationDuration
animations:^{
self.imageView.center = ... // set this to whatever you want
}];
}
- (void)startDisplayLink
{
self.displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(handleDisplayLink:)];
self.startTime = CACurrentMediaTime();
[self.displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
}
- (void)stopDisplayLink
{
[self.displayLink invalidate];
self.displayLink = nil;
}
- (void)handleDisplayLink:(CADisplayLink *)displayLink
{
CFTimeInterval elapsed = displayLink.timestamp - self.startTime;
// If you want it to repeat, then comment out the following `if` statement
if (elapsed >= kAnimationDuration)
{
[self stopDisplayLink];
return;
}
NSInteger frameNumber = ((NSInteger) elapsed * [self.imageNames count]/kAnimationDuration) % [self.imageNames count];
if (frameNumber != self.currentFrameNumber)
{
self.imageView.image = [UIImage imageNamed:self.imageNames[frameNumber]];
self.currentFrameNumber = frameNumber;
}
}
来源
2013-03-26 04:35:30
Rob
如果什么第5帧中,说如果球员被移动到左边,我希望它中断5帧,它会移动到右边从那个框架?我可以调用stopDisplayLink在它完成之前中断它,然后开始一个新的显示链接序列吗? – mskw 2013-03-26 05:03:37
@mskw是的,这应该工作。试试看。仅供参考,如果你想重复动画,你可能需要像上面那样调整frameNumber,然后注释掉if(elapsed> = kAnimationDuration)...块。但希望你明白这个主意。 – Rob 2013-03-26 08:09:22
@mskw我可能误解了你的问题。如果您希望动画从停止的位置继续播放,您需要调整“CADisplayLink”代码(例如,在设置一次后不要重置“startTime”)。 – Rob 2013-03-26 16:02:35