问点击NSSetUncaughtExceptionHandler时使用CoreGraphics在屏幕上绘制

EN

NSSetUncaughtExceptionHandler(&exceptionHandler);

void exceptionHandler(NSException *exception)
{
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:CGPointMake(10.0, 10.0)];
    [path moveToPoint:CGPointMake(10.0, 10.0)];
    [path addLineToPoint:CGPointMake(10.0, 450.0)];
    [path addLineToPoint:CGPointMake(310.0, 450.0)];
    [path addLineToPoint:CGPointMake(310.0, 10.0)];
    [path addLineToPoint:CGPointMake(10.0, 10.0)];

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer.path = [path CGPath];
    shapeLayer.strokeColor = [[UIColor blueColor] CGColor];
    shapeLayer.lineWidth = 3.0;
    shapeLayer.fillColor = [[UIColor clearColor] CGColor];

    [APP_DELEGATE_WINDOW.rootViewController.view.layer addSublayer:shapeLayer];
    [APP_DELEGATE_WINDOW makeKeyAndVisible];
}