Question

我正在为tvOS编写一个游戏，需要使用触控板在屏幕上移动对象 - 而不是鼠标指针在Mac上移动。我遇到的问题是，在我的游戏中，UIViewController没有接收touchesBegan或touchesMoved。在网上看了一些关于touchesBegan没有在tvOS上工作的文章我写了一个小程序来测试这个理论

ViewController.h：

#import <UIKit/UIKit.h>
@interface ViewController : UIViewController {
    CGPoint cursorLocation;
    UIImageView* cursorImage;
}
@end

ViewController.m：

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    cursorImage = [[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, 92.0, 92.0)];
    cursorImage.center = CGPointMake(CGRectGetMidX([UIScreen mainScreen].bounds), CGRectGetMidY([UIScreen mainScreen].bounds));
    cursorImage.image = [UIImage imageNamed:@"Cursor"];

    cursorImage.backgroundColor = [UIColor clearColor];
    cursorImage.hidden = NO;
    [self.view addSubview:cursorImage];

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    cursorLocation = CGPointMake(-1, -1);
}

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    UITouch* touch = [touches anyObject];
    CGPoint location = [touch locationInView:self.view];
    if ((cursorLocation.x == -1) && (cursorLocation.y == -1)) {
        cursorLocation = [touch locationInView:self.view];
    } else {
        float xDiff = location.x - cursorLocation.x;
        float yDiff = location.y - cursorLocation.y;
        CGRect rect = cursorImage.frame;
        if ((rect.origin.x + xDiff >=0) && (rect.origin.x + xDiff <= self.view.frame.size.width)) {
            rect.origin.x += xDiff;
        }
        if ((rect.origin.y + yDiff >=0) && (rect.origin.y + yDiff <= self.view.frame.size.height)) { 
            rect.origin.y += yDiff;
            cursorImage.frame = rect;
            cursorLocation = location;
        }
    }
}

@end

我的测试很精彩！我的问题是，什么可能阻止touchesBegan或touchesMoved被我的完整应用程序中的ViewController接收（其来源对于这个问题来说太长了）？ Spitball离开 - 我没有想法，我欢迎任何你可能有的建议！

Answer 1

您的示例代码没有任何手势识别器，但您的完整应用程序可能会这样做。某些手势可能导致touchesBegan:永远不会被发送到响应者链。

您应该重试完整的应用，但尽可能多地移除手势识别器，您可能会发现touchesBegan:方法开始被调用。

如果您确定问题实际上是一个手势，那么您可以通过在相关手势上将cancelsTouchesInView设置为NO或通过设置来获得与响应者链方法配合的手势delaysTouchesBegan到NO（虽然这应该是默认值）。

Answer 2

如果启用tvOS焦点引擎，将不再调用触摸事件。只需在屏幕上放置UIButton，或例如使用UITabBarController`，即可启用焦点引擎并禁用触摸事件。

如果您仍然需要触摸事件，请查看以下答案：UIButton blocking touchesBegan and touchesMoved

TVOS UIViewController不接收touchesBegan或touchesMoved

2 个答案: