ios - 当点击 NSSetUncaughtExceptionHandler 时使用 CoreGraphics 在屏幕上绘制

Question

当 NSSetUncaughtExceptionHandler 被调用但什么也没有发生时，我试图在屏幕上绘制一些简单的东西。有没有其他方法可以捕获异常并快速在屏幕上绘制内容？

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];
}

Answer 1

我不确定 NSSetUncaughtExceptionHandler 是否适合在屏幕上绘制内容。

Sets the top-level error-handling function where you can perform last-minute logging before the program terminates.

大多数崩溃报告者都会仔细记录痕迹，尽量不要“触摸”除此之外的任何东西。

如果你真的想画一些东西(什么？)你应该先捕获一个特定的异常。只是没有任何未捕获的异常。