gistfile1.m

    if (!self.lineLayer.superlayer)
        [self.layer addSublayer:self.lineLayer];
    CGFloat height = 1.0f / [UIScreen mainScreen].scale;
    self.lineLayer.frame = CGRectMake(0.0, CGRectGetHeight(self.bounds) - height, CGRectGetWidth(self.bounds), height);
    
    
    
    
#pragma mark - Lazy loading

- (CALayer *)lineLayer {
    if (!self->_lineLayer) {
        CALayer *lineLayer = [[CALayer alloc] init];
        lineLayer.backgroundColor = [UIColor colorWithWhite:0.8f alpha:1.0f].CGColor;
        self->_lineLayer = lineLayer;
    }
    return self->_lineLayer;
}