同时处理多个动画的问题

Question

这是我的代码：

-(void) createNewImage {
UIImage * image = [UIImage imageNamed:@"abouffer_03.png"];
imageView = [[UIImageView alloc] initWithImage:image];
[imageView setCenter:[self randomPointSquare]];
 [imageViewArray addObject:imageView];
[[self view] addSubview:imageView];
[imageView release];
}

-(void)moveTheImage{
for(int i=0; i< [imageViewArray count];i++){
 UIImageView *imageView = [imageViewArray objectAtIndex:i];
imageView.center = CGPointMake(imageView.center.x + X, imageView.center.y + Y);
}
}

-(void)viewDidLoad {
[super viewDidLoad];
[NSTimer scheduledTimerWithTimeInterval:4 target:self selector:@selector(onTimer) userInfo:nil repeats:YES];
displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(onTimer2)];
[displayLink setFrameInterval:1];
[displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
imageViewArray = [[NSMutableArray alloc]init];

}

所以我想做的是 http://www.youtube.com/watch ?v=rD3MTTPaK98。 但我的问题是，创建 imageView（createNewImage）后，它会在 4 秒后停止（可能是由于计时器）。我希望 imageView 在创建新 imageView 时继续移动。请问我该怎么做？抱歉我的英语我是法国人：/

Answer 1

相反，请保留对您希望所有图像也移动的点的引用。使用 NSTimer 并在计时器中自行移动所有图像最终会大大降低您的应用程序的速度（我从经验中知道）。使用 UIView 动画块，并在创建它时告诉它移动到该点。

-(void) createNewImage {
   UIImage * image = [UIImage imageNamed:@"abouffer_03.png"];
   imageView = [[[UIImageView alloc] initWithImage:image] autorelease];
   [imageView setCenter:[self randomPointSquare]];

   //Move to the centerPoint
   [self moveTheImage:imageView];

   [imageViewArray addObject:imageView];
   [[self view] addSubview:imageView];
}

-(void)moveTheImage:(UIImageView *)imageView {
   [UIView animateWithDuration:1.0
                    animations:^{
                       [imageView setCenter:centerPoint];
                    }];
}

-(void)viewDidLoad {
   [super viewDidLoad];
   imageViewArray = [[NSMutableArray alloc]init];

   //IDK what all that other code was

   centerPoint = self.view.center;
}

编辑：在动画期间查找 UIImage

您需要引用 UIImageView 的表示层以在动画期间查找其位置

UIImageView *image = [imageViewArray objectAtIndex:0];
CGRect currentFrame = [[[image layer] presentationLayer] frame];

for(UIImageView *otherImage in imageViewArray) {

   CGRect objectFrame = [[[otherImage layer] presentationLayer] frame];

   if(CGRectIntersectsRect(currentFrame, objectFrame)) {
       NSLog(@"OMG, image: %@ intersects object: %@", image, otherImage);
   }
}