相关疑难解决方法(0)

我正在玩绘图路径,我注意到至少在某些情况下,UIBezierPath优于我认为的Core Graphics等价物.-drawRect:下面的方法创建两个路径:一个UIBezierPath和一个CGPath.除了它们的位置之外,路径是相同的,但是抚摸CGPath所需的时间大约是抚摸UIBezierPath的两倍.

- (void)drawRect:(CGRect)rect
{
    CGContextRef ctx = UIGraphicsGetCurrentContext();

    // Create the two paths, cgpath and uipath.
    CGMutablePathRef cgpath = CGPathCreateMutable();
    CGPathMoveToPoint(cgpath, NULL, 0, 100);

    UIBezierPath *uipath = [[UIBezierPath alloc] init];
    [uipath moveToPoint:CGPointMake(0, 200)];

    // Add 200 curve segments to each path.
    int iterations = 200;
    CGFloat cgBaseline = 100;
    CGFloat uiBaseline = 200;
    CGFloat xincrement = self.bounds.size.width / iterations;
    for (CGFloat x1 = 0, x2 = xincrement;
         x2 < self.bounds.size.width;
         x1 = x2, x2 += xincrement)
    { …