问

UIImagePickerController编辑视图圆叠加

柏慧Bertha 发布于 2023-02-07 21:59

我已经能够完成我想要完成的任务,那就是复制iOS内置的圆形照片裁剪器,用于内置的联系人应用程序.但是,我一直在试图让我的CAShapeLayers制作正确.我正在尝试制作一个透明的320像素直径圆圈,其余部分则填充0.9 alpha黑色背景.圆形和矩形在正确的位置,但是,圆形并不像我需要的那样完全透明.

我迷失了如何解决这个问题.我感谢您的帮助!代码和截图:

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if ([navigationController.viewControllers count] == 3)
    {
        CGRect screenRect = [[UIScreen mainScreen] bounds];
        CGFloat screenHeight = screenRect.size.height;

        UIView *plCropOverlay = [[[viewController.view.subviews objectAtIndex:1]subviews] objectAtIndex:0];

        plCropOverlay.hidden = YES;

        CAShapeLayer *circleLayer = [CAShapeLayer layer];

        if (screenHeight == 568)
        {
            [circleLayer setPosition:CGPointMake(0.0f,124.0f)];
        }    
        else
        {
            [circleLayer setPosition:CGPointMake(0.0f,80.0f)];
        }

        UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:
                          CGRectMake(0.0f, 0.0f, 320.0f, 320.0f)];

        [circleLayer setPath:[path CGPath]];

        [circleLayer setFillColor:[[UIColor whiteColor] CGColor]];
        circleLayer.opacity = 0.7f;

        // Set to 0.7f to show for screenshot purposes; setting to 0.0 would make it invisible and blend in with the below rectangleLayer.

        CAShapeLayer *rectangleLayer = [CAShapeLayer layer];

        UIBezierPath *path2 = [UIBezierPath bezierPathWithRect:CGRectMake(0.0f, 0.0f, 320.0f, screenHeight - 72)];
        [rectangleLayer setPath:[path2 CGPath]];

        [rectangleLayer setFillColor:[[UIColor blackColor] CGColor]];
        [rectangleLayer setOpacity:0.9f];
        [rectangleLayer addSublayer:circleLayer];
        [[viewController.view layer] addSublayer:rectangleLayer];

        UILabel *moveLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 10, 320, 50)];
        [moveLabel setText:@"Move and Scale"];
        [moveLabel setTextAlignment:NSTextAlignmentCenter];
        [moveLabel setTextColor:[UIColor whiteColor]];

        [viewController.view addSubview:moveLabel];
    }
}

在此输入图像描述

1 个回答

已解决的代码:

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if ([navigationController.viewControllers count] == 3)
    {
        CGFloat screenHeight = [[UIScreen mainScreen] bounds].size.height;

        UIView *plCropOverlay = [[[viewController.view.subviews objectAtIndex:1]subviews] objectAtIndex:0];

        plCropOverlay.hidden = YES;

        int position = 0;

        if (screenHeight == 568)
        {
            position = 124;
        }
        else
        {
            position = 80;
        }

        CAShapeLayer *circleLayer = [CAShapeLayer layer];

        UIBezierPath *path2 = [UIBezierPath bezierPathWithOvalInRect:
                           CGRectMake(0.0f, position, 320.0f, 320.0f)];
        [path2 setUsesEvenOddFillRule:YES];

        [circleLayer setPath:[path2 CGPath]];

        [circleLayer setFillColor:[[UIColor clearColor] CGColor]];
        UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 320, screenHeight-72) cornerRadius:0];

        [path appendPath:path2];
        [path setUsesEvenOddFillRule:YES];

        CAShapeLayer *fillLayer = [CAShapeLayer layer];
        fillLayer.path = path.CGPath;
        fillLayer.fillRule = kCAFillRuleEvenOdd;
        fillLayer.fillColor = [UIColor blackColor].CGColor;
        fillLayer.opacity = 0.8;
        [viewController.view.layer addSublayer:fillLayer];

        UILabel *moveLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 10, 320, 50)];
        [moveLabel setText:@"Move and Scale"];
        [moveLabel setTextAlignment:NSTextAlignmentCenter];
        [moveLabel setTextColor:[UIColor whiteColor]];

        [viewController.view addSubview:moveLabel];
    }
}

2023-02-07 22:11 回答

心悦随鑫_196

撰写答案

今天，你开发时遇到什么问题呢？

立即提问

热门标签