多个CALayer掩码导致性能问题 [英] Multiple CALayer masks causing performance issues
本文介绍了多个CALayer掩码导致性能问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试使用6个 CALayer 对象创建一个相当简单的动画，每个对象都被一条路径遮盖。但是，在为动画设置动画时，我遇到了明显的延迟尖峰。
我可以通过设置 rasterizationScale 到屏幕比例，但是会带回没有光栅化发生的滞后尖峰！
这是我的代码：
@interface splashLayer：CALayer
@ end
@ implementation splashLayer {
UIColor * color;
CALayer * l1，* l2，* l3，* l4，* l5，* l6;
CAShapeLayer * m1，* m2，* m3，* m4，* m5，* m6;
NSUInteger i;
}
-（instancetype）init {
if（self = [super init]）{
color = [lzyColors purpleColor];
i = 0;
m1 = [CAShapeLayer层]; m2 = [CAShapeLayer层]; m3 = [CAShapeLayer层]; m4 = [CAShapeLayer层]; m5 = [CAShapeLayer层]; m6 = [CAShapeLayer层];
self.shouldRasterize = YES;
self.rasterizationScale = screenScale（）; //降低性能，但停止丑陋的像素化。
CGMutablePathRef p = CGPathCreateMutable（）;
CGFloat const meanScreenLength =（screenHeight（）+ screenWidth（））* 0.5;
CGFloat const pythag = lzyMathsPythag（meanScreenLength，meanScreenLength）;
CGFloat const halfPythag = pythag * 0.5;
CGFloat const pythagHalfPythag = lzyMathsPythag（halfPythag，halfPythag）;
CGPoint const center = screenCenter（）;
CGPoint p1 = {center.x，center.y-pythagHalfPythag};
CGPoint p2 = {center.x + pythagHalfPythag，center.y};
CGPoint p3 = {center.x，center.y + pythagHalfPythag};
CGPoint p4 = {center.x-pythagHalfPythag，center.y};
CGPathMoveToPoint（p，nil，p1.x，p1.y）;
lzyCGPathAddLineToPath（p，p2）;
lzyCGPathAddLineToPath（p，p3）;
lzyCGPathAddLineToPath（p，p4）;
CGPathCloseSubpath（p）;
m1.path = p; m2.path = p; m3.path = p; m4.path = p; m5.path = p; m6.path = p;
CGPathRelease（p）;
m1.position =（CGPoint）{-pythag，-pythag}; m2.position =（CGPoint）{-pythag，-pythag}; m3.position =（CGPoint）{-pythag，-pythag};
m4.position =（CGPoint）{pythag，pythag}; m5.position =（CGPoint）{pythag，pythag}; m6.position =（CGPoint）{pythag，pythag};
l1 = [CALayer层];
l1.contents =（__bridge id _Nullable）（colorImage（[color lightenByValue：0.6]，screenSize（））。CGImage）;
l1.frame =（CGRect）{CGPointZero，screenSize（）};
l1.mask = m1;
l2 = [CALayer层];
l2.contents =（__bridge id _Nullable）（textBG（[color lightenByValue：0.3]，screenSize（））。CGImage）;
l2.frame =（CGRect）{CGPointZero，screenSize（）};
l2.mask = m2;
l3 = [CALayer层];
// l3.rasterizationScale = screenScale（）; （无效）
l3.contents =（__bridge id _Nullable）（textBG（color，screenSize（））。CGImage）;
l3.frame =（CGRect）{CGPointZero，screenSize（）};
l3.mask = m3;
UIColor * color2 = [lzyColors redColor];
l4 = [CALayer层];
l4.contents =（__bridge id _Nullable）（colorImage（[color2 lightenByValue：0.6]，screenSize（））。CGImage）;
l4.frame =（CGRect）{CGPointZero，screenSize（）};
l4.mask = m4;
l5 = [CALayer层];
l5.contents =（__bridge id _Nullable）（colorImage（[color2 lightenByValue：0.3]，screenSize（））。CGImage）;
l5.frame =（CGRect）{CGPointZero，screenSize（）};
l5.mask = m5;
l6 = [CALayer层];
l6.contents =（__bridge id _Nullable）（colorImage（color2，screenSize（））。CGImage）;
l6.frame =（CGRect）{CGPointZero，screenSize（）};
l6.mask = m6;
[self addSublayer：l1]; [self addSublayer：l2]; [self addSublayer：l3]; [self addSublayer：l4]; [self addSublayer：l5]; [self addSublayer：l6];
CABasicAnimation * anim = [CABasicAnimation animationWithKeyPath：@ position];
anim.fromValue = [NSValue valueWithCGPoint：（CGPoint）{-pythag，-pythag}];
anim.toValue = [NSValue valueWithCGPoint：CGPointZero];
anim.delegate =自我；
anim.beginTime = CACurrentMediaTime（）+ 1;
anim.timingFunction = [CAMediaTimingFunction functionWithName：kCAMediaTimingFunctionEaseInEaseOut];
anim.removedOnCompletion =否；
anim.fillMode = kCAFillModeForwards;
anim.duration = 1;
[m1 addAnimation：anim forKey：@ 0];
anim.duration = 1.25;
[m2 addAnimation：anim forKey：@ 1];
anim.duration = 1.5;
[m3 addAnimation：anim forKey：@ 2];
anim.fromValue = [NSValue valueWithCGPoint：（CGPoint）{pythag，pythag}];
anim.beginTime = CACurrentMediaTime（）+ 2.5;
anim.duration = 1;
[m4 addAnimation：anim forKey：@ 3];
anim.duration = 1.25;
[m5 addAnimation：anim forKey：@ 4];
anim.duration = 1.5;
[m6 addAnimation：anim forKey：@ 5];
}
返回自我；
}
@end
我知道代码非常
colorImage（）& textBG（）函数仅执行一些Core Graphics渲染即可为6层生成6张图像。这不应该是问题的根源，因为绘图很简单，动画在开始之前会延迟一秒钟。
我尝试仅设置 rasterizationScale 到显示文本的图层上的屏幕比例，但这是行不通的。
我还尝试通过删除来提高性能一旦完成动画制作，第二层就位于第三层下面，但是它并没有显着提高性能。
-（void ）animationDidStop：（CAAnimation *）动画完成：（BOOL）flag {
if（flag）{
if（i == 2）{
[l1 removeFromSuperlayer];
l1 =零;
m1 =零;
[l2 removeFromSuperlayer];
l2 =零;
m2 =零;
l3.mask = nil;
m3 =零；
}
i ++；
}
}
关于如何改善效果的任何建议？
解决方案
好吧，尝试了无数种方法来尝试实现此动画之后；我得出的结论是，仅仅过渡到openGL可能会更好。这将使我能够为该问题创建一个更通用的解决方案，以便在使用更复杂的动画时效果更好。
I am trying to create a fairly simple animation using 6 CALayer objects, each masked by a path. However, I am running into significant lag spikes when trying to animate them. Here is a video of the animation running. I am able to boost performance by setting shouldRasterize to YES, however it results in pixelation of the text, as you can see from this image:
I can correct the pixelation by setting the rasterizationScale to the screen scale, however that brings back the lag spikes that occurred without rasterization!
Here is my code:
@interface splashLayer : CALayer
@end
@implementation splashLayer {
UIColor* color;
CALayer* l1, *l2, *l3, *l4, *l5, *l6;
CAShapeLayer* m1, *m2, *m3, *m4, *m5, *m6;
NSUInteger i;
}
-(instancetype) init {
if (self = [super init]) {
color = [lzyColors purpleColor];
i = 0;
m1 = [CAShapeLayer layer]; m2 = [CAShapeLayer layer]; m3 = [CAShapeLayer layer]; m4 = [CAShapeLayer layer]; m5 = [CAShapeLayer layer]; m6 = [CAShapeLayer layer];
self.shouldRasterize = YES;
self.rasterizationScale = screenScale(); // Slows down performance, but stops ugly pixelation.
CGMutablePathRef p = CGPathCreateMutable();
CGFloat const meanScreenLength = (screenHeight()+screenWidth())*0.5;
CGFloat const pythag = lzyMathsPythag(meanScreenLength, meanScreenLength);
CGFloat const halfPythag = pythag*0.5;
CGFloat const pythagHalfPythag = lzyMathsPythag(halfPythag, halfPythag);
CGPoint const center = screenCenter();
CGPoint p1 = {center.x, center.y-pythagHalfPythag};
CGPoint p2 = {center.x+pythagHalfPythag, center.y};
CGPoint p3 = {center.x, center.y+pythagHalfPythag};
CGPoint p4 = {center.x-pythagHalfPythag, center.y};
CGPathMoveToPoint(p, nil, p1.x, p1.y);
lzyCGPathAddLineToPath(p, p2);
lzyCGPathAddLineToPath(p, p3);
lzyCGPathAddLineToPath(p, p4);
CGPathCloseSubpath(p);
m1.path = p; m2.path = p; m3.path = p; m4.path = p; m5.path = p; m6.path = p;
CGPathRelease(p);
m1.position = (CGPoint){-pythag, -pythag}; m2.position = (CGPoint){-pythag, -pythag}; m3.position = (CGPoint){-pythag, -pythag};
m4.position = (CGPoint){pythag, pythag}; m5.position = (CGPoint){pythag, pythag}; m6.position = (CGPoint){pythag, pythag};
l1 = [CALayer layer];
l1.contents = (__bridge id _Nullable)(colorImage([color lightenByValue:0.6], screenSize()).CGImage);
l1.frame = (CGRect){CGPointZero, screenSize()};
l1.mask = m1;
l2 = [CALayer layer];
l2.contents = (__bridge id _Nullable)(textBG([color lightenByValue:0.3], screenSize()).CGImage);
l2.frame = (CGRect){CGPointZero, screenSize()};
l2.mask = m2;
l3 = [CALayer layer];
// l3.rasterizationScale = screenScale(); (Doesn't work)
l3.contents = (__bridge id _Nullable)(textBG(color, screenSize()).CGImage);
l3.frame = (CGRect){CGPointZero, screenSize()};
l3.mask = m3;
UIColor* color2 = [lzyColors redColor];
l4 = [CALayer layer];
l4.contents = (__bridge id _Nullable)(colorImage([color2 lightenByValue:0.6], screenSize()).CGImage);
l4.frame = (CGRect){CGPointZero, screenSize()};
l4.mask = m4;
l5 = [CALayer layer];
l5.contents = (__bridge id _Nullable)(colorImage([color2 lightenByValue:0.3], screenSize()).CGImage);
l5.frame = (CGRect){CGPointZero, screenSize()};
l5.mask = m5;
l6 = [CALayer layer];
l6.contents = (__bridge id _Nullable)(colorImage(color2, screenSize()).CGImage);
l6.frame = (CGRect){CGPointZero, screenSize()};
l6.mask = m6;
[self addSublayer:l1]; [self addSublayer:l2]; [self addSublayer:l3]; [self addSublayer:l4]; [self addSublayer:l5]; [self addSublayer:l6];
CABasicAnimation* anim = [CABasicAnimation animationWithKeyPath:@"position"];
anim.fromValue = [NSValue valueWithCGPoint:(CGPoint){-pythag, -pythag}];
anim.toValue = [NSValue valueWithCGPoint:CGPointZero];
anim.delegate = self;
anim.beginTime = CACurrentMediaTime()+1;
anim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
anim.removedOnCompletion = NO;
anim.fillMode = kCAFillModeForwards;
anim.duration = 1;
[m1 addAnimation:anim forKey:@"0"];
anim.duration = 1.25;
[m2 addAnimation:anim forKey:@"1"];
anim.duration = 1.5;
[m3 addAnimation:anim forKey:@"2"];
anim.fromValue = [NSValue valueWithCGPoint:(CGPoint){pythag, pythag}];
anim.beginTime = CACurrentMediaTime()+2.5;
anim.duration = 1;
[m4 addAnimation:anim forKey:@"3"];
anim.duration = 1.25;
[m5 addAnimation:anim forKey:@"4"];
anim.duration = 1.5;
[m6 addAnimation:anim forKey:@"5"];
}
return self;
}
@end
I know the code is very crude, but I've just simplified it for debugging.
The colorImage() & textBG() functions just do some Core Graphics rendering to produce the 6 images for the 6 layers. This shouldn't be the source of the problem as drawing is simple and the animation is delayed by a second before starting.
I tried only setting the rasterizationScale to the screen scale on layers that display text, but this didn't work.
I have also tried to improve performance by removing the two layers underneath the third layer, once it has finished animating, however it hasn't improved performance significantly.
-(void) animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
if (flag) {
if (i == 2) {
[l1 removeFromSuperlayer];
l1 = nil;
m1 = nil;
[l2 removeFromSuperlayer];
l2 = nil;
m2 = nil;
l3.mask = nil;
m3 = nil;
}
i++;
}
}
Any suggestions on how to improve the performance?
解决方案
Well, after trying countless methods to try and achieve this animation; I have arrived at the conclusion that I am probably better off just making the leap over to openGL. This will allow me to create a more general solution to the problem that'll fare better with more complex animations.
这篇关于多个CALayer掩码导致性能问题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IT屋！
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