如何使用可可中的核心动画来动画化一个png序列（非触摸）

问题描述

我想在NSImageView中对一个png序列进行动画处理，但是我不能使它工作。它只是不想显示任何动画。任何建议？

这是我的代码：

   - ）imageAnimation {
 NSMutableArray * iconImages = [[NSMutableArray allocate] init]; 
 for（int i = 0; i  NSString * imagePath = [NSString stringWithFormat：@％@ _％05d，@clear，i] 
 [iconImages addObject：（id）[NSImage imageNamed：imagePath]]; 
 // NSImage * iconImage = [NSImage imageNamed：imagePath]; 
 // [iconImages addObject：（__ bridge id）CGImageCreateWithNSImage（iconImage）]; 
} 
 
 
 CALayer * layer = [CALayer layer]; 
 CAKeyframeAnimation * animation = [CAKeyframeAnimation animationWithKeyPath：@contents]; 
 [animation setCalculationMode：kCAAnimationDiscrete]; 
 [animation setDuration：10.0f]; 
 [animation setRepeatCount：HUGE_VALF]; 
 [animation setValues：iconImages]; 
 
 [layer setFrame：NSMakeRect（0，0，104，104）]; 
 layer.bounds = NSMakeRect（0，0，104，104）; 
 [layer addAnimation：animation forKey：@contents]; 
 
 //添加到NSImageView图层
 [iconV.layer addSublayer：layer]; 
} 
  

解决方案

tl; dr： strong>

通过调用

使您的视图层托管。

  [iconV setLayer： CALayer layer]]; 
 [iconV setWantsLayer：YES]; 
  
 
 
 
 
 
 
为什么不发生
 $ b $没有什么发生的原因是你的图像视图没有一层，所以当你调用 [iconV.layer addSublayer：layer]; 您正在向 nil 发送消息，并且什么也不会发生（子图层不会添加到图像视图）。 
 
 
 
 OS X上的视图默认情况下不使用Core Animation图层作为其后备存储，以实现向后兼容性。具有图层的视图可以是层支持的或层托管。 
 
 
 
您不应该直接与层次支持的视图进行交互，而且不应添加视图层是确定）到一个layer- 托管视图。由于您要将图层添加到图片视图图层（从而直接与其进行交互），因此您需要一个图层托管视图。
 
 
 
修复
 
 
 
你可以告诉你的观点，它应该是layer-hosting通过首先给它的图层使用 [iconV setLayer：[CALayer layer]]; 然后（顺序很重要）告诉它它想要一个图层使用 [iconV setWantsLayer：YES]; 。 
 
 
 
有关图层支持和图层托管视图的详情，请参阅。 
 
I would like to animate a png sequence in a NSImageView, but I cannot make it work. It just does not want to show any animation. Any suggestion?

This is my code:
- (void) imageAnimation {
  NSMutableArray *iconImages = [[NSMutableArray alloc] init];
  for (int i=0; i<=159; i++) {
    NSString *imagePath = [NSString stringWithFormat:@"%@_%05d",@"clear",i];
    [iconImages addObject:(id)[NSImage imageNamed:imagePath]];
    //NSImage *iconImage = [NSImage imageNamed:imagePath];
    //[iconImages addObject:(__bridge id)CGImageCreateWithNSImage(iconImage)];
  }


  CALayer *layer = [CALayer layer];
  CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
  [animation setCalculationMode:kCAAnimationDiscrete];
  [animation setDuration:10.0f];
  [animation setRepeatCount:HUGE_VALF];
  [animation setValues:iconImages];

  [layer setFrame:NSMakeRect(0, 0, 104, 104)];
  layer.bounds = NSMakeRect(0, 0, 104, 104);
  [layer addAnimation:animation forKey:@"contents"];

  //Add to the NSImageView layer
  [iconV.layer addSublayer:layer];
}
 解决方案 
tl;dr:
Make your view layer-hosting by calling
[iconV setLayer:[CALayer layer]];
[iconV setWantsLayer:YES];
Why nothing happens
The reason nothing is happening is that your image view doesn't have a layer so when you call [iconV.layer addSublayer:layer]; you are sending a message to nil and nothing happens (the sublayer is not added to the image view). 
Views on OS X don't use Core Animation layers as their backing store by default for backwards compatibility. A view with a layer can either be layer-backed or layer-hosting. 
You should not interact directly with a layer-backed view and you shouldn't add views (but adding layers is ok) to a layer-hosting view. Since you are adding the layer to your image views layer (and thus interacting directly with it) you want a layer-hosting view.
Fixing it
You can tell your view that it should be layer-hosting by first giving it the layer using [iconV setLayer:[CALayer layer]]; and then (order is important) telling it that it wants a layer using [iconV setWantsLayer:YES];. 
For more information on layer-backed and layer-hosting views please read the documentation for wantsLayer. 
                        
这篇关于如何使用可可中的核心动画来动画化一个png序列（非触摸）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！