我想用這樣一種方式使用CAGradientLayer
: -製作漸變弧線?
20%的弧具有相同的單色,其他80%的弧具有兩種顏色的梯度。 我已經試過locations
startPoint
endPoint
CAGradientLayer
的屬性,但無法取得成功,已經從教程中通過,但不知何故無法正確理解這個概念。請用明確的描述來解決我的問題。
// for beizier path
- (UIBezierPath *)samplePath
{
UIBezierPath *path = [UIBezierPath bezierPath];
path = [UIBezierPath bezierPath];
[path addArcWithCenter:CGPointMake(200, 200) radius:30.0f startAngle:(3*M_PI)/4 endAngle:M_PI/4 clockwise:YES];
path.lineWidth = 30;
[[UIColor redColor] setStroke];
// [[UIColor colorWithRed:arc4random() green:arc4random() blue:arc4random() alpha:1.0] setFill];
[path stroke];
return path;
}
- (void)startAnimation
{
CAShapeLayer *shapeLayer;
if (self.pathLayer == nil)
{
shapeLayer = [CAShapeLayer layer];
shapeLayer.path = [[self samplePath] CGPath];
shapeLayer.strokeColor = [[UIColor redColor] CGColor];
shapeLayer.fillColor = nil;
shapeLayer.lineWidth = 30;
self.pathLayer = shapeLayer;
}
[self animationBasic];
[self gradientLayer:shapeLayer];
}
-(void)animationBasic
{
CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
pathAnimation.duration = 3.0;
pathAnimation.fromValue = @(0.0f);
pathAnimation.toValue = @(1.0f);
[self.pathLayer addAnimation:pathAnimation forKey:@"strokeEnd"];
}
-(void)gradientLayer:(CAShapeLayer *)shapelayer
{
CAGradientLayer *gradientLayer = [CAGradientLayer layer];
gradientLayer.frame = self.frame;
gradientLayer.colors = @[(__bridge id)[UIColor yellowColor].CGColor,(__bridge id)[UIColor redColor].CGColor ];
gradientLayer.locations = [NSArray arrayWithObjects:
[NSNumber numberWithFloat:0.5f],
[NSNumber numberWithFloat:1.0f],
nil];
// gradientLayer.startPoint = CGPointMake(0,1);
// gradientLayer.endPoint = CGPointMake(1,1);
[self.layer addSublayer:gradientLayer];
gradientLayer.mask = shapelayer;
}
您需要使用locations屬性...發佈您嘗試過的代碼,我們會幫助您正確地做到這一點。 – ZeMoon
@ZeMoon好的我正在做它 –
@ZeMoon歪了一下,請讓我明白這個概念。 –