CAShapeLayer的使用[2]
CAShapeLayer支持的动画类型有如下这些.
------------------------------------------------------------------------------
/* The path defining the shape to be rendered. If the path extends
* outside the layer bounds it will not automatically be clipped to the
* layer, only if the normal layer masking rules cause that. Defaults
* to null. Animatable. (Note that although the path property is
* animatable, no implicit animation will be created when the property
* is changed.) */
@property CGPathRef path;
------------------------------------------------------------------------------
/* The color to fill the path's stroked outline, or nil for no stroking.
* Defaults to nil. Animatable. */
@property CGColorRef strokeColor;
------------------------------------------------------------------------------
/* These values define the subregion of the path used to draw the
* stroked outline. The values must be in the range [0,1] with zero
* representing the start of the path and one the end. Values in
* between zero and one are interpolated linearly along the path
* length. strokeStart defaults to zero and strokeEnd to one. Both are
* animatable. */
@property CGFloat strokeStart, strokeEnd;
------------------------------------------------------------------------------
/* The line width used when stroking the path. Defaults to one.
* Animatable. */
@property CGFloat lineWidth;
------------------------------------------------------------------------------
/* The miter limit used when stroking the path. Defaults to ten.
* Animatable. */
@property CGFloat miterLimit;
------------------------------------------------------------------------------
/* The phase of the dashing pattern applied when creating the stroke.
* Defaults to zero. Animatable. */
@property CGFloat lineDashPhase;
------------------------------------------------------------------------------
现在来尝试path动画,结果如下:
首先用工具生成path源码:
源码:
- (void)viewDidLoad
{
[super viewDidLoad];
// shapeLayer
CAShapeLayer *circleLayer = [CAShapeLayer layer];
circleLayer.frame = (CGRect){CGPointMake(0, 0), CGSizeMake(200, 200)};
circleLayer.position = self.view.center;
circleLayer.path = [self getStar1BezierPath].CGPath;
circleLayer.fillColor = [UIColor clearColor].CGColor;
circleLayer.strokeColor = [UIColor redColor].CGColor;
circleLayer.lineWidth = 2.f;
[self.view.layer addSublayer:circleLayer];
// 定时器
_timer = [[GCDTimer alloc] initInQueue:[GCDQueue mainQueue]];
[_timer event:^{
static int i = 0;
if (i++ % 2 == 0)
{
CABasicAnimation *circleAnim = [CABasicAnimation animationWithKeyPath:@"path"];
circleAnim.removedOnCompletion = NO;
circleAnim.duration = 1;
circleAnim.fromValue = (__bridge id)[self getStar1BezierPath].CGPath;
circleAnim.toValue = (__bridge id)[self getStar2BezierPath].CGPath;
circleLayer.path = [self getStar2BezierPath].CGPath;
[circleLayer addAnimation:circleAnim forKey:@"animateCirclePath"];
}
else
{
CABasicAnimation *circleAnim = [CABasicAnimation animationWithKeyPath:@"path"];
circleAnim.removedOnCompletion = NO;
circleAnim.duration = 1;
circleAnim.fromValue = (__bridge id)[self getStar2BezierPath].CGPath;
circleAnim.toValue = (__bridge id)[self getStar1BezierPath].CGPath;
circleLayer.path = [self getStar1BezierPath].CGPath;
[circleLayer addAnimation:circleAnim forKey:@"animateCirclePath"];
}
} timeInterval:NSEC_PER_SEC];
[_timer start];
}
-(UIBezierPath *)getStar1BezierPath
{
//// Star Drawing
UIBezierPath* starPath = [UIBezierPath bezierPath];
[starPath moveToPoint: CGPointMake(22.5, 2.5)];
[starPath addLineToPoint: CGPointMake(28.32, 14.49)];
[starPath addLineToPoint: CGPointMake(41.52, 16.32)];
[starPath addLineToPoint: CGPointMake(31.92, 25.56)];
[starPath addLineToPoint: CGPointMake(34.26, 38.68)];
[starPath addLineToPoint: CGPointMake(22.5, 32.4)];
[starPath addLineToPoint: CGPointMake(10.74, 38.68)];
[starPath addLineToPoint: CGPointMake(13.08, 25.56)];
[starPath addLineToPoint: CGPointMake(3.48, 16.32)];
[starPath addLineToPoint: CGPointMake(16.68, 14.49)];
[starPath closePath];
return starPath;
}
-(UIBezierPath *)getStar2BezierPath
{
//// Star Drawing
UIBezierPath* starPath = [UIBezierPath bezierPath];
[starPath moveToPoint: CGPointMake(22.5, 2.5)];
[starPath addLineToPoint: CGPointMake(32.15, 9.21)];
[starPath addLineToPoint: CGPointMake(41.52, 16.32)];
[starPath addLineToPoint: CGPointMake(38.12, 27.57)];
[starPath addLineToPoint: CGPointMake(34.26, 38.68)];
[starPath addLineToPoint: CGPointMake(22.5, 38.92)];
[starPath addLineToPoint: CGPointMake(10.74, 38.68)];
[starPath addLineToPoint: CGPointMake(6.88, 27.57)];
[starPath addLineToPoint: CGPointMake(3.48, 16.32)];
[starPath addLineToPoint: CGPointMake(12.85, 9.21)];
[starPath closePath];
return starPath;
}CALayer中有一个令人抽搐的属性叫mask,据说可以做动画,官方文档上说可以:
但其属性说明中根本就没有animatable字眼.
/* A layer whose alpha channel is used as a mask to select between the
* layer's background and the result of compositing the layer's
* contents with its filtered background. Defaults to nil. When used as
* a mask the layer's `compositingFilter' and `backgroundFilters'
* properties are ignored. When setting the mask to a new layer, the
* new layer must have a nil superlayer, otherwise the behavior is
* undefined. */
@property(retain) CALayer *mask;
这是个bug哦:).
将CAShapeLayer当做mask做动画的效果:
源码:
- (void)viewDidLoad
{
[super viewDidLoad];
// shapeLayer
CAShapeLayer *circleLayer = [CAShapeLayer layer];
circleLayer.frame = (CGRect){CGPointMake(0, 0), CGSizeMake(200, 200)};
circleLayer.position = self.view.center;
circleLayer.path = [self getStar1BezierPath].CGPath;
circleLayer.fillColor = [UIColor blackColor].CGColor;
circleLayer.strokeColor = [UIColor redColor].CGColor;
circleLayer.lineWidth = 2.f;
// backgroundLayer
CALayer *layer = [CALayer layer];
layer.frame = self.view.bounds;
layer.contents = (__bridge id)([UIImage imageNamed:@"psb.jpg"].CGImage);
layer.mask = circleLayer;
[self.view.layer addSublayer:layer];
// 定时器
_timer = [[GCDTimer alloc] initInQueue:[GCDQueue mainQueue]];
[_timer event:^{
static int i = 0;
if (i++ % 2 == 0)
{
CABasicAnimation *circleAnim = [CABasicAnimation animationWithKeyPath:@"path"];
circleAnim.removedOnCompletion = NO;
circleAnim.duration = 1;
circleAnim.fromValue = (__bridge id)[self getStar1BezierPath].CGPath;
circleAnim.toValue = (__bridge id)[self getStar2BezierPath].CGPath;
circleLayer.path = [self getStar2BezierPath].CGPath;
[circleLayer addAnimation:circleAnim forKey:@"animateCirclePath"];
}
else
{
CABasicAnimation *circleAnim = [CABasicAnimation animationWithKeyPath:@"path"];
circleAnim.removedOnCompletion = NO;
circleAnim.duration = 1;
circleAnim.fromValue = (__bridge id)[self getStar2BezierPath].CGPath;
circleAnim.toValue = (__bridge id)[self getStar1BezierPath].CGPath;
circleLayer.path = [self getStar1BezierPath].CGPath;
[circleLayer addAnimation:circleAnim forKey:@"animateCirclePath"];
}
} timeInterval:NSEC_PER_SEC];
[_timer start];
}
-(UIBezierPath *)getStar1BezierPath
{
//// Star Drawing
UIBezierPath* starPath = [UIBezierPath bezierPath];
[starPath moveToPoint: CGPointMake(22.5, 2.5)];
[starPath addLineToPoint: CGPointMake(28.32, 14.49)];
[starPath addLineToPoint: CGPointMake(41.52, 16.32)];
[starPath addLineToPoint: CGPointMake(31.92, 25.56)];
[starPath addLineToPoint: CGPointMake(34.26, 38.68)];
[starPath addLineToPoint: CGPointMake(22.5, 32.4)];
[starPath addLineToPoint: CGPointMake(10.74, 38.68)];
[starPath addLineToPoint: CGPointMake(13.08, 25.56)];
[starPath addLineToPoint: CGPointMake(3.48, 16.32)];
[starPath addLineToPoint: CGPointMake(16.68, 14.49)];
[starPath closePath];
return starPath;
}
-(UIBezierPath *)getStar2BezierPath
{
//// Star Drawing
UIBezierPath* starPath = [UIBezierPath bezierPath];
[starPath moveToPoint: CGPointMake(22.5, 2.5)];
[starPath addLineToPoint: CGPointMake(32.15, 9.21)];
[starPath addLineToPoint: CGPointMake(41.52, 16.32)];
[starPath addLineToPoint: CGPointMake(38.12, 27.57)];
[starPath addLineToPoint: CGPointMake(34.26, 38.68)];
[starPath addLineToPoint: CGPointMake(22.5, 38.92)];
[starPath addLineToPoint: CGPointMake(10.74, 38.68)];
[starPath addLineToPoint: CGPointMake(6.88, 27.57)];
[starPath addLineToPoint: CGPointMake(3.48, 16.32)];
[starPath addLineToPoint: CGPointMake(12.85, 9.21)];
[starPath closePath];
return starPath;
}附录:
用CAShapeLayer与贝塞尔曲线一起制作下载进度条是相当的容易的说:
//
// RootViewController.m
//
// Copyright (c) 2014年 Y.X. All rights reserved.
//
#import "RootViewController.h"
#import "YXGCD.h"
@interface RootViewController ()
@property (nonatomic, strong) GCDTimer *timer;
@end
@implementation RootViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// 获取path
UIBezierPath *path = [self getBezierPathWithLength:300 lineWidth:1];
// shapeLayer
CAShapeLayer *circleLayer = [CAShapeLayer layer];
circleLayer.frame = path.bounds;
circleLayer.position = self.view.center;
circleLayer.fillColor = [UIColor clearColor].CGColor;
circleLayer.strokeColor = [UIColor redColor].CGColor;
circleLayer.path = path.CGPath;
circleLayer.lineWidth = 1.f;
[self.view.layer addSublayer:circleLayer];
// 定时器
_timer = [[GCDTimer alloc] initInQueue:[GCDQueue mainQueue]];
[_timer event:^{
circleLayer.strokeEnd = arc4random()%100/100.f;
} timeInterval:NSEC_PER_SEC];
[_timer start];
}
-(UIBezierPath *)getBezierPathWithLength:(CGFloat)length lineWidth:(CGFloat)lineWidth
{
//// Bezier Drawing
UIBezierPath* bezierPath = [UIBezierPath bezierPath];
[bezierPath moveToPoint: CGPointMake(0, 0)];
[bezierPath addLineToPoint: CGPointMake(length, 0)];
bezierPath.lineWidth = lineWidth;
return bezierPath;
}
@end
