iOS简单的动画绘制 #CABasicAnimation# #

- (void)drawError
{
    [_logoView removeFromSuperview];
    _logoView = [[UIView alloc] initWithFrame:CGRectMake(([self getSelfSize].width-Simble_SIZE)/2, Simble_TOP, Simble_SIZE, Simble_SIZE)];
    
    
    // 绘制轨迹 with UIBezierPath
    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(Simble_SIZE/2, Simble_SIZE/2) radius:Simble_SIZE/2 startAngle:0 endAngle:M_PI*2 clockwise:YES];
    
    CGPoint p1 =  CGPointMake(Simble_SIZE/4, Simble_SIZE/4);
    [path moveToPoint:p1];
    
    CGPoint p2 =  CGPointMake(Simble_SIZE/4*3, Simble_SIZE/4*3);
    [path addLineToPoint:p2];
    
    CGPoint p3 =  CGPointMake(Simble_SIZE/4*3, Simble_SIZE/4);
    [path moveToPoint:p3];
    
    CGPoint p4 =  CGPointMake(Simble_SIZE/4, Simble_SIZE/4*3);
    [path addLineToPoint:p4];
    
    
    CAShapeLayer *layer = [[CAShapeLayer alloc] init];
    layer.lineWidth = 5;
    layer.path = path.CGPath;
    layer.fillColor = [UIColor clearColor].CGColor;
    layer.strokeColor = [UIColor redColor].CGColor;
    
    
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:NSStringFromSelector(@selector(strokeEnd))];
    animation.fromValue = @0;
    animation.toValue = @1;
    animation.duration = 0.5;
    [layer addAnimation:animation forKey:NSStringFromSelector(@selector(strokeEnd))];
    
    [_logoView.layer addSublayer:layer];
    [self addSubview:_logoView];
}