ios - drawRect 不调整大小并跑出屏幕 3.5 英寸屏幕

Question

我正在使用绘制矩形来绘制带有角半径的矩形。该代码完美运行。在 4 英寸屏幕上查看时，您会看到矩形。在 3.5 英寸屏幕上查看时，矩形不会调整大小并超出屏幕底部。有什么指点吗？

- (void)drawRect:(CGRect)rect
{
    [super drawRect:rect];

    CGContextRef context = UIGraphicsGetCurrentContext();

    CGRect rrect = CGRectMake(20, 30, 280, 515);
    CGFloat radius = 7;

    CGFloat minx = CGRectGetMinX(rrect), midx = CGRectGetMidX(rrect), maxx = CGRectGetMaxX(rrect);
    CGFloat miny = CGRectGetMinY(rrect), midy = CGRectGetMidY(rrect), maxy = CGRectGetMaxY(rrect);

    // Start at 1
    CGContextMoveToPoint(context, minx, midy);
    // Add an arc through 2 to 3
    CGContextAddArcToPoint(context, minx, miny, midx, miny, radius);
    // Add an arc through 4 to 5
    CGContextAddArcToPoint(context, maxx, miny, maxx, midy, radius);
    // Add an arc through 6 to 7
    CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius);
    // Add an arc through 8 to 9
    CGContextAddArcToPoint(context, minx, maxy, minx, midy, radius);

    // Close the path
    CGContextClosePath(context);

    CGContextSetStrokeColorWithColor(context, [[UIColor whiteColor] CGColor]);
    CGContextSetRGBFillColor(context, 255, 255, 255, 1.0);

    // Fill & stroke the path
    CGContextDrawPath(context, kCGPathFillStroke);

}

Answer 1

CGRect rrect = CGRectMake(20, 30, 280, 515);

这就是问题所在。您从偏移量 20 开始绘制高度为 515 的矩形，而您的屏幕并没有那么长。尝试使用 View 的框架来绘制而不是硬编码值

CGRect rrect = CGRectMake(20, 30, self.frame.size.width - 20*2, self.frame.size.height - 30*2);