我应该如何创建一个UIView,使其看起来像这样,并且它的子视图也有相同的效果。
在网络上搜索后,我发现可以通过CALayer实现,但我对此不够了解。请帮助我,谢谢。
根据我的水平和理解,我做了一些编码,可能对你有所帮助,如果不需要请忽略。
第一步是从新文件创建自定义视图。
接下来,我们需要将ViewController的view属性的类从UIView更改为我们的CustomView类。打开MainStoryboard.storyboard,在文档大纲中单击View图标。然后,打开identity inspector(选项+命令+3),并将类名更改为CustomView。
然后在自定义视图中添加此代码。
- (void)drawRect:(CGRect)rect
{
// Drawing code
UIImage *imageRecipe =[UIImage imageNamed:@"statement_card_1.png"];
UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(0 ,0 ,290, 200)];
imgView.image = imageRecipe;
[self addSubview:imgView];
CGPoint secondPoint = CGPointZero;
CGPoint point1 = CGPointZero;
CGPoint initial = CGPointZero;
UIBezierPath *aPath = [UIBezierPath bezierPath];
initial = CGPointMake(30, 60);
[aPath moveToPoint:initial];
CGPoint point = CGPointMake(290, 60);
CGPoint centerPoint = CGPointMake(point.x/2, -10);
[aPath addQuadCurveToPoint:point controlPoint:centerPoint];
secondPoint = CGPathGetCurrentPoint(aPath.CGPath);
[aPath addLineToPoint:CGPointMake(secondPoint.x, 200.0)];
point1 = CGPathGetCurrentPoint(aPath.CGPath);
CGPoint p = CGPointMake(initial.x,point1.y);
CGPoint cp = CGPointMake(point1.x/2 ,point1.y/2 + 30);
[aPath addQuadCurveToPoint:p controlPoint:cp];
[aPath addLineToPoint:CGPointMake(initial.x, secondPoint.y)];
[aPath closePath];
[aPath stroke];
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = imgView.bounds;
maskLayer.path = aPath.CGPath;
imgView.layer.mask = maskLayer;
}
没有OpenGL或其他引擎是不可能实现的。你不能以这种方式变形CALayer。图层的基本思想是它是一个平面。
也许可以用图像和一些旋转的视图之类的东西来伪造它?