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[英]How to inherit animation properties while animating CALayer with implicit animation
[英]How to change color of CALayer while animating
我有一個弧形,它繞一圈旋轉,並且變色了三次。 我在SO上使用了一個示例來開始學習:設置動畫時更改CALayer顏色
此示例有效,但是顏色是紅色,然后是綠色,然后是藍色。 我希望它們是綠色,橙色,然后是紅色。 我試圖弄清楚他如何在代碼中更改顏色,這讓我很困惑:
for (NSUInteger i = 0; i < 3; i++)
{
CAShapeLayer* strokePart = [[CAShapeLayer alloc] init];
strokePart.fillColor = [[UIColor clearColor] CGColor];
strokePart.frame = tutorialCircle.bounds;
strokePart.path = tutorialCircle.path;
strokePart.lineCap = tutorialCircle.lineCap;
strokePart.lineWidth = tutorialCircle.lineWidth;
// These could come from an array or whatever, this is just easy...
strokePart.strokeColor = [[UIColor colorWithHue: i * portion saturation:1 brightness:1 alpha:1] CGColor];
所以我相信這條線正在改變顏色:
strokePart.strokeColor = [[UIColor colorWithHue: i * portion saturation:1 brightness:1 alpha:1] CGColor];
我的目標是將這些顏色操縱為綠色橙色紅色,而不是紅色綠色和藍色。
謝謝
編輯:
這是part的值:
const double portion = 1.0 / ((double)3);
HUE-Color系統以360度角定義顏色,其中0是紅色,108(360 * 0,3)是綠色,是藍色。 這是生成顏色的方式:
strokePart.strokeColor = [[UIColor colorWithHue: 0 saturation:1 brightness:1 alpha:1] CGColor]; // RED
strokePart.strokeColor = [[UIColor colorWithHue: 0.3 saturation:1 brightness:1 alpha:1] CGColor]; // GREEN
strokePart.strokeColor = [[UIColor colorWithHue: 0.6 saturation:1 brightness:1 alpha:1] CGColor]; // BLUE
如果要更改為顏色,則可以將該部分移動其他值:
strokePart.strokeColor = [[UIColor colorWithHue: 0.3 + portion saturation:1 brightness:1 alpha:1] CGColor];
或者,您可以定義自己的數組,並使用以下顏色:
NSArray* colors = @[ UIColor.green, UIColor.orange, UIColor.red ];
for (id color in colors)
{
CAShapeLayer* strokePart = [[CAShapeLayer alloc] init];
strokePart.fillColor = [[UIColor clearColor] CGColor];
strokePart.frame = tutorialCircle.bounds;
strokePart.path = tutorialCircle.path;
strokePart.lineCap = tutorialCircle.lineCap;
strokePart.lineWidth = tutorialCircle.lineWidth;
// These could come from an array or whatever, this is just easy...
strokePart.strokeColor = [color CGColor];
啊,我只是想通了。 以下是答案:
if (i == 0) {
strokePart.strokeColor = [UIColor greenColor].CGColor;
}
else if (i == 1) {
strokePart.strokeColor = [UIColor orangeColor].CGColor;
}
else if (i == 2) {
strokePart.strokeColor = [UIColor redColor].CGColor;
}
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