Question

考虑以下视图层次结构

self.view
- self.transformedView（z-transform = 10，index 0）
- self.ordinaryView（z-transform = 0，index 1）

通过此代码实现生命

@interface AGSTransformedView : UIView
@end
@implementation AGSTransformedView

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"The transformed view is receiving touch");
    [super touchesBegan:touches withEvent:event];
}

@end


@interface AGSOrdinaryView : UIView
@end
@implementation AGSOrdinaryView

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"The ordinary view is receiving touch");
    [super touchesBegan:touches withEvent:event];
}

@end

@interface AGSViewController ()

@end

@implementation AGSViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    AGSTransformedView *transformed = [[AGSTransformedView alloc] initWithFrame:self.view.bounds];
    transformed.layer.transform = CATransform3DMakeTranslation(0, 0, 10);
    transformed.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:transformed];

    AGSOrdinaryView *ordinary = [[AGSOrdinaryView alloc] initWithFrame:self.view.bounds];
    ordinary.backgroundColor = [UIColor blueColor];
    [self.view addSubview:ordinary];
}

@end

点击屏幕时，我在控制台中看到了这个

The ordinary view is receiving touch

在屏幕上我只看到黄色视图（变换视图）。

为什么最前面的可见视图不会接触到触摸？

Answer 1

似乎UIKit在确定哪个视图应该是触摸接收器时仅尊重视图层次结构。我还没有找到这方面的文件。

最前面可见的UIView没有接触，为什么？

1 个答案: