Hrayr's questions

写蛇。根据文档，当动画持续时间<=0时，动画不会发生。但它是动画的。

let dur = abroad ? -1 : speed
UIView.animate(withDuration: dur) {
        for i in 0..<(self.snakes.count - 1) {
            let snake = self.snakes[self.snakes.count - i - 2]
            let temp = oldFrame
            oldFrame = snake.frame
            snake.frame = temp
            if snake.frame.intersects(main.frame) {
                self.gameOver = true
                print("game over!!!!!")
            }
        }
        if self.abroad {
            print(dur) // -1
        }
    }

当我这样做时

var dur:TimeInterval = 0

没有动画，但是像这样：

var dur:TimeInterval = 0
if !abroad {
    dur = TimeInterval(speed)
}

在国外== false时也会发生动画。我不知道出了什么问题。在此先感谢您的帮助

var str:NSString = "somesjhgbjkl"
let str2 = str
str = "g" as NSString
print(str2)

此代码应打印“g”，但会打印“somesjhgbjkl”。为什么会这样？

我正在尝试播放音频文件。

let url = URL.init(fileURLWithPath: Bundle.main.path(forResource: name, ofType: nil)!)
    do {
        player = try AVAudioPlayer(contentsOf: url)
        player.play()
    } catch {
        print("error")
    }

给出错误消息：

Fatal error: Unexpectedly found nil while unwrapping an Optional value: file.  
/Users/hrayr/Desktop/Projects/Подводный бой/Подводный бой/Music/AudioPlayer.swift, line 15
2020-05-06 13:51:49.010761+0400 Подводный бой[947:28055] Fatal error: Unexpectedly found nil 
while unwrapping an Optional value: file /Users/hrayr/Desktop/Projects/Подводный бой/. 
Подводный бой/Music/AudioPlayer.swift, line 15

怎么修？提前致谢

我将 collectionView 放在 tableview 单元格（最顶部）上。

我收到一个错误：

Warning once only: Detected a case where constraints ambiguously suggest a height of zero for a table view cell's content view. We're considering the collapse unintentional and using standard height instead. Cell: <CarTypeTableViewCell: 0x7f8f0bd13db0; baseClass = UITableViewCell; frame = (0 28; 414 101); clipsToBounds = YES; autoresize = W; layer = <CALayer: 0x600003dd0360>>

可能是什么问题呢？

添加了所有约束，但由于某种原因它发誓。

在 c#中有类似的类似物，否则代码的可读性会随着 999+ 行代码而下降

“公共矢量 SpeedVector”的“SpeedVector”出现“可访问性不一致”错误。

struct Vector
{
    public float x;
    public float y;

    public Vector(float x, float y)
    {
        this.x = x;
        this.y = y;
    }

    public static Vector operator +(Vector v1, Vector v2)
    {
        return new Vector(v1.x + v2.x, v1.y + v2.y);
    }
}
public class GameObject : Control
{
    public float mass;
    private Vector speedVector = new Vector(0, 0);

    public Vector SpeedVector
    {
        set
        {
            if (mass != 0)
            {
                speedVector = value;
            }
        }
        get => speedVector;
    }

    public void ElliminateCollision(GameObject obj1, GameObject obj2)
    {

    }

}