如何使我的UIBezierPath与CAShapeLayer动画？(How to make my U

我想动画一个UIBezierPath，我已经安装了CAShapeLayer尝试去做。不幸的是，动画不工作，我不知道任何一层都具有任何影响（如代码做同样的事情就在做之前，我有层）。

下面是实际的代码 - 喜欢任何帮助。那么Draw2D是的UIView的实现，嵌入在一个UIViewController。所有绘图从Draw2D类中发生的事情。以呼叫[_helper createDrawing ...]简单地填充与点_uipath变量。

Draw2D.h定义了以下性能：

#define defaultPointCount ((int) 25)

@property Draw2DHelper *helper;
@property drawingTypes drawingType;
@property int graphPoints;
@property UIBezierPath *uipath;

@property CALayer *animationLayer;
@property CAShapeLayer *pathLayer;

- (void)refreshRect:(CGRect)rect;

下面是实际执行：

//
//  Draw2D.m
//  Draw2D
//
//  Created by Marina on 2/19/13.
//  Copyright (c) 2013 Marina. All rights reserved.
//

#import "Draw2D.h"
#import"Draw2DHelper.h"
#include <stdlib.h>
#import "Foundation/Foundation.h"
#import <QuartzCore/QuartzCore.h>

int MAX_WIDTH;
int MAX_HEIGHT;

@implementation Draw2D

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code

        if (self.pathLayer != nil) {
            [self.pathLayer removeFromSuperlayer];
            self.pathLayer = nil;
        }

        self.animationLayer = [CALayer layer];
        self.animationLayer.frame = self.bounds;
        [self.layer addSublayer:self.animationLayer];

        CAShapeLayer *l_pathLayer = [CAShapeLayer layer];
        l_pathLayer.frame = self.frame;
        l_pathLayer.bounds = self.bounds;
        l_pathLayer.geometryFlipped = YES;
        l_pathLayer.path = _uipath.CGPath;
        l_pathLayer.strokeColor = [[UIColor grayColor] CGColor];
        l_pathLayer.fillColor = nil;
        l_pathLayer.lineWidth = 1.5f;
        l_pathLayer.lineJoin = kCALineJoinBevel;

        [self.animationLayer addSublayer:l_pathLayer];
        self.pathLayer = l_pathLayer;
        [self.layer addSublayer:l_pathLayer];
    }
    return self;
}

// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect :(int) points :(drawingTypes) type //:(Boolean) initial
{
    //CGRect bounds = [[UIScreen mainScreen] bounds];
    CGRect appframe= [[UIScreen mainScreen] applicationFrame];
    CGContextRef context = UIGraphicsGetCurrentContext();
    _helper = [[Draw2DHelper alloc ] initWithBounds :appframe.size.width  :appframe.size.height :type];

    CGPoint startPoint = [_helper generatePoint] ;

    [_uipath moveToPoint:startPoint];
    [_uipath setLineWidth: 1.5];

    CGContextSetStrokeColorWithColor(context, [UIColor lightGrayColor].CGColor);

    CGPoint center = CGPointMake(self.center.y, self.center.x) ;
    [_helper createDrawing :type :_uipath :( (points>0) ? points : defaultPointCount) :center];
    self.pathLayer.path = (__bridge CGPathRef)(_uipath);
    [_uipath stroke];

    [self startAnimation]; 
}

- (void) startAnimation {
    [self.pathLayer removeAllAnimations];

    CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    pathAnimation.duration = 3.0;
    pathAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
    pathAnimation.toValue = [NSNumber numberWithFloat:1.0f];
    [self.pathLayer addAnimation:pathAnimation forKey:@"strokeEnd"];

}

- (void)drawRect:(CGRect)rect {
    if (_uipath == NULL)
        _uipath = [[UIBezierPath alloc] init];
    else
        [_uipath removeAllPoints];

    [self drawRect:rect  :self.graphPoints :self.drawingType ];
}

- (void)refreshRect:(CGRect)rect {
    [self setNeedsDisplay];
}

@end

我知道大概有为什么的路径是不是动画，因为它是被绘制（而不是被立即显示出来这是现在发生的事情），但我在的东西一直盯着这么久，我只是做不是一个明显的原因看见。

此外，如果任何人都可以在一般建议上CAShapeLayers和动画一个基本的底我将不胜感激。还没有拿出任何对面是不够好。

提前致谢。

它看起来像你想内动画drawRect （间接地，至少）。这并不完全意义。您没有在动画drawRect 。所述drawRect被用于绘制单个帧。一些动画与定时器或做CADisplayLink反复调用setNeedsDisplay （这将导致的iOS打电话给你drawRect ），在此期间，你可能会得出单个帧，显示该点的动画的进度。但是，你根本就没有drawRect开始对自己的任何动画。

但是，由于您使用的核心动画的CAShapeLayer和CABasicAnimation ，你并不需要一个自定义drawRect可言。 Quartz的核心动画只是需要照顾一切的为您服务。例如，这里是我的一个动画的绘制代码UIBezierPath ：

#import <QuartzCore/QuartzCore.h>

@interface View ()
@property (nonatomic, weak) CAShapeLayer *pathLayer;
@end

@implementation View

/*
// I'm not doing anything here, so I can comment this out
- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}
*/

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

// It doesn't matter what my path is. I could make it anything I wanted.

- (UIBezierPath *)samplePath
{
    UIBezierPath *path = [UIBezierPath bezierPath];

    // build the path here

    return path;
}

- (void)startAnimation
{
    if (self.pathLayer == nil)
    {
        CAShapeLayer *shapeLayer = [CAShapeLayer layer];

        shapeLayer.path = [[self samplePath] CGPath];
        shapeLayer.strokeColor = [[UIColor grayColor] CGColor];
        shapeLayer.fillColor = nil;
        shapeLayer.lineWidth = 1.5f;
        shapeLayer.lineJoin = kCALineJoinBevel;

        [self.layer addSublayer:shapeLayer];

        self.pathLayer = shapeLayer;
    }

    CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    pathAnimation.duration = 3.0;
    pathAnimation.fromValue = @(0.0f);
    pathAnimation.toValue = @(1.0f);
    [self.pathLayer addAnimation:pathAnimation forKey:@"strokeEnd"];
}

@end

然后，当我要开始绘制动画，我只是叫我startAnimation方法。我可能甚至不需要一个UIView子类，在所有的，因为这简单的事，因为我没有真正改变任何UIView行为。肯定有，你继承倍UIView使用自定义drawRect实现，但它不是在这里需要。

你问了一些参考：