如何使用核心动画为 NSTextField 的背景颜色设置动画？

Question

我正在尝试使用核心动画来突出显示无效的文本字段。

[[my_field animator] setBackgroundColor [NSColor yellowColor]]

更新字段背景颜色，但不为更改设置动画。更新属性（例如字段的位置）会正确设置动画。我假设这是因为背景颜色不包含在 NSAnimatablePropertyContainer 搜索中。

我也尝试过显式创建动画，但无济于事。

CABasicAnimation *ani;
ani = [CABasicAnimation animationWithKeyPath:@"backgroundColor"];

ani.fromValue = CGColorCreateGenericRGB(1.0,1.0,1.0,1.0);
ani.toValue = CGColorCreateGenericRGB(1.0,0.0,0.0,1.0);
ani.repeatCount = 2;
ani.autoreverses = YES;
ani.duration = 1.0;

[[my_field layer] addAnimation:ani forKey:"backgroundColor"];

对完成这项工作的建议？

Answer 1

圣诞快乐：

NSView *content = [[self window] contentView];
CALayer *layer = [content layer];

CABasicAnimation *anime = [CABasicAnimation animationWithKeyPath:@"backgroundColor"];
anime.fromValue = (id)[layer backgroundColor];
anime.toValue = (id)CGColorCreateGenericGray(0.0f, 1.0f);
anime.duration = 5.0f;
anime.autoreverses = YES;

[layer addAnimation:anime forKey:@"backgroundColor"];

这将使用支持层为视图的背景颜色设置动画。记得在 init 或 awake 中设置想要层：

[[[self window] contentView] setWantsLayer:YES];

Answer 2

虽然我从未设法弄清楚如何为背景颜色设置动画，但我能够通过设置 CIFalseColor 过滤器的动画来创建所需的效果。

CIFilter *filter = [CIFilter filterWithName:@"CIFalseColor"];
[filter setDefaults];
[filter setValue:[CIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:1.0] forKey:@"inputColor0"];
[filter setValue:[CIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0] forKey:@"inputColor1"];
[filter setName:@"pulseFilter"];
[[myField layer] setFilters:[NSArray arrayWithObject:filter]];

CABasicAnimation* pulseAnimation = [CABasicAnimation animation];
pulseAnimation.keyPath = @"filters.pulseFilter.inputColor1";

pulseAnimation.fromValue = [CIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0];
pulseAnimation.toValue = [CIColor colorWithRed:0.995 green:1.0 blue:0.655 alpha:1.0];

pulseAnimation.duration = 0.3;
pulseAnimation.repeatCount = 1;
pulseAnimation.autoreverses = YES;

[[myField layer] addAnimation:pulseAnimation forKey:@"pulseAnimation"];