使用CGPath绘制一条线 [英] draw a line by using CGPath

问题描述

如何使用CGPath绘制一条线？

How can I draw a line by using CGPath ?

推荐答案

因为你没有真正指定如何绘制一条带路径的线，我只想给你一个例子。

As you didn't really specify more than how to draw a line with a path, I'll just give you an example.

在路径的左上角和右下角（在iOS上）之间绘制一条带有路径的对角线在UIView的drawRect：

Drawing a diagonal line between the top left corner and the bottom right (on iOS) with a path in a UIView's drawRect:

- (void)drawRect:(CGRect)rect { 
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, 0, 0);
    CGPathAddLineToPoint(path, NULL, CGRectGetMaxX(rect), CGRectGetMaxY(rect));
    CGPathCloseSubpath(path);
    CGContextAddPath(ctx, path);
    CGContextSetStrokeColorWithColor(ctx,[UIColor whiteColor].CGColor);
    CGContextStrokePath(ctx);
    CGPathRelease(path);
}

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