动画按钮

by 伍雪颖

github

- (void)awakeFromNib {
    self.lineColor= [UIColorwhiteColor];
    self.lineHeight= 2.0;
    self.lineSpacing= 8.0;
    self.lineWidth= 30.0;
    [selfupdateAppearance];
}

- (void)updateAppearance {
    CGFloat x = CGRectGetWidth(self.bounds) / 2.0;
    CGFloat heightDiff =self.lineHeight+ self.lineSpacing;
    CGFloat y = CGRectGetHeight(self.bounds) / 2.0- heightDiff;
   
    _topLayer = [selfcreateLayer];
    _topLayer.position= CGPointMake(x , y);
    y += heightDiff;
   
    _middleLayer = [selfcreateLayer];
    _middleLayer.position= CGPointMake(x , y);
    y += heightDiff;
   
    _bottomLayer = [selfcreateLayer];
    _bottomLayer.position= CGPointMake(x , y);
    [selftransformToState:_currentState];
}

- (void)transformToState:(AnimationButtonState)state {
    _currentState = state;
    CATransform3D transform;
    switch (state) {
        case AnimationButtonStateCross:{
            transform = CATransform3DMakeTranslation(0.0,_middleLayer.position.y-_topLayer.position.y,0.0);
            _topLayer.transform= CATransform3DRotate(transform,M_PI_4,0.0,0.0,1.0);
            _middleLayer.transform= CATransform3DMakeScale(0.,0.,0.);
            transform = CATransform3DMakeTranslation(0.0,_middleLayer.position.y-_bottomLayer.position.y,0.0);
            _bottomLayer.transform= CATransform3DRotate(transform, -M_PI_4,0.0,0.0,1.0);
        }break;
        default:{
            _topLayer.transform= CATransform3DIdentity;
            _middleLayer.transform= CATransform3DIdentity;
            _bottomLayer.transform= CATransform3DIdentity;
        }break;
    }
}

- (CAShapeLayer*)createLayer {
    CAShapeLayer *layer = [CAShapeLayernew];
    UIBezierPath *path = [UIBezierPathnew];
    [path moveToPoint:CGPointMake(0,0)];
    [path addLineToPoint:CGPointMake(self.lineWidth,0)];
   
    layer.path= path.CGPath;
    layer.lineWidth= self.lineHeight;
    layer.strokeColor= self.lineColor.CGColor;
    layer.lineCap= @"round";
   
    CGPathRef bound = CGPathCreateCopyByStrokingPath(layer.path,
                                                     nil,
                                                     layer.lineWidth,
                                                     kCGLineCapButt,
                                                     kCGLineJoinMiter,
                                                     layer.miterLimit);
    layer.bounds= CGPathGetBoundingBox(bound);
    CGPathRelease(bound);
    [self.layeraddSublayer:layer];
    return layer;

}