iOS开发 - 画线 方便自定义细线

某些时候我们需要一些细节调整，可以自己自定义线，下面是画直线的例子。同时提供 View 转 Image 方法，方便某些时候直接当图像使用。

/// 自定义线视图
class LineView: UIView {
    
    /// 快速创建 默认全屏  height 高度
    static func creatLineView(height height:CGFloat) -> LineView {
        let lineView = LineView(frame: CGRect(x: 0, y: 0, width: UIScreen.mainScreen().bounds.width, height: height))
        lineView.backgroundColor = UIColor.clearColor()
        return lineView
    }
    
    /// 画直线
    override func drawRect(rect: CGRect) {
        
        let context = UIGraphicsGetCurrentContext()
        CGContextSetAllowsAntialiasing(context, true)
        CGContextSetLineWidth(context, self.frame.height)
        
        CGContextSetRGBStrokeColor(context, 136/255, 136/255, 136/255, 1)// 颜色
        CGContextBeginPath(context)
        
        CGContextMoveToPoint(context, 0, 0);  //起点坐标
        CGContextAddLineToPoint(context, self.frame.size.width, 0) //终点坐标
        
        CGContextStrokePath(context)
    }
}

extension LineView {
    /// View -> UIImage
    func convertViewToImage() -> UIImage {
        let size = self.bounds.size
        //UIGraphicsBeginImageContext(size)
        UIGraphicsBeginImageContextWithOptions(size, false, UIScreen.mainScreen().scale)
        self.layer.renderInContext(UIGraphicsGetCurrentContext()!)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}