iphone - 具有时间延迟的 performSelector 在 for 循环中不起作用 - iPhone

Question

我希望有人能帮助我。我正在编写一个简单的游戏，当用户按下一个按钮时，会生成一个与按钮编号相对应的数字数组，然后使用 for 循环按时间延迟依次打开和关闭每个按钮。问题是阵列中的所有按钮都打开，只有最后一个关闭。就像 perfomSelector with time delay 命令只在 for 循环结束时执行，有人知道为什么吗？

这是我使用的代码:

- (IBAction)buttonPushed:(id)sender;
{
    //creat random array of buttons
    [self randomArray];

    //loop through each button in array and turn them on and off
    for (NSString *i in gameArray) 
    {
        int butNum = [i intValue];

        numLit = [[NSNumber alloc] initWithInt:butNum];

        //turn button on
        [self buttonLit];

        //turn button off
        [self performSelector:@selector(buttonUnLit) withObject:nil afterDelay:1.0];

    }

}

- (void)randomArray
{
    //initialize array
    gameArray = [[NSMutableArray alloc] initWithArray:NULL];

    //************* Build random array of numbers *******************
    for (int i = 0; i < level; i++) 
    {
        //generate a number from 0 to 11 at random
        NSInteger num = (arc4random() % 11);

        //add number to array
        [gameArray addObject:[NSString stringWithFormat:@"%i", num]];
    }
    return;

}

- (void)buttonLit
{
    int numLitInt = [numLit intValue];


    if (numLitInt == 0) 
    {
        [button0 setImage:[UIImage imageNamed:@"0(lite).png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 1)
    {
        [button1 setImage:[UIImage imageNamed:@"1(lite).png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 2)
    {
        [button2 setImage:[UIImage imageNamed:@"2(lite).png"] forState:UIControlStateNormal];
        return;
   }else if (numLitInt == 3)
    {
        [button3 setImage:[UIImage imageNamed:@"3(lite).png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 4)
    {
        [button4 setImage:[UIImage imageNamed:@"4(lite).png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 5)
    {
        [button5 setImage:[UIImage imageNamed:@"5(lite).png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 6)
    {
        [button6 setImage:[UIImage imageNamed:@"6(lite).png"] forState:UIControlStateNormal];
        return;
   }else if (numLitInt == 7)
    {
        [button7 setImage:[UIImage imageNamed:@"7(lite).png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 8)
    {
        [button8 setImage:[UIImage imageNamed:@"8(lite).png"] forState:UIControlStateNormal];
        return;
   }else if (numLitInt == 9)
    {
        [button9 setImage:[UIImage imageNamed:@"9(lite).png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 10)
    {
        [button10 setImage:[UIImage imageNamed:@"10(lite).png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 11)
    {
        [button11 setImage:[UIImage imageNamed:@"11(lite).png"] forState:UIControlStateNormal];
        return;
    }

}


- (void)buttonUnLit
{
    int numLitInt = [numLit intValue];


    if (numLitInt == 0) 
    {
        [button0 setImage:[UIImage imageNamed:@"0.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 1)
    {
        [button1 setImage:[UIImage imageNamed:@"1.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 2)
    {
        [button2 setImage:[UIImage imageNamed:@"2.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 3)
    {
        [button3 setImage:[UIImage imageNamed:@"3.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 4)
    {
        [button4 setImage:[UIImage imageNamed:@"4.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 5)
    {
        [button5 setImage:[UIImage imageNamed:@"5.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 6)
    {
        [button6 setImage:[UIImage imageNamed:@"6.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 7)
    {
        [button7 setImage:[UIImage imageNamed:@"7.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 8)
    {
        [button8 setImage:[UIImage imageNamed:@"8.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 9)
    {
        [button9 setImage:[UIImage imageNamed:@"9.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 10)
    {
        [button10 setImage:[UIImage imageNamed:@"10.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 11)
    {
        [button11 setImage:[UIImage imageNamed:@"11.png"] forState:UIControlStateNormal];
        return;
    }

}

Answer 1

你的问题很明显，你正在通过 for 循环更改 numLit，你希望选择器在一秒钟内执行，当第一个选择器触发时你已经将 numLit 更改为最后一个数字，这就是为什么所有火灾修改最后一个按钮......你应该通过将数字传递给buttonUnlit来解决这个问题，这样你就不会依赖于你不断改变的类变量......就像

- (void)buttonUnLit:(NSNumber*)number
{
    int numLitInt = [number intValue];


    if (numLitInt == 0) 
    {
        [button0 setImage:[UIImage imageNamed:@"0.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 1)
    {
        [button1 setImage:[UIImage imageNamed:@"1.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 2)
    {
        [button2 setImage:[UIImage imageNamed:@"2.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 3)
    {
        [button3 setImage:[UIImage imageNamed:@"3.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 4)
    {
        [button4 setImage:[UIImage imageNamed:@"4.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 5)
    {
        [button5 setImage:[UIImage imageNamed:@"5.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 6)
    {
        [button6 setImage:[UIImage imageNamed:@"6.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 7)
    {
        [button7 setImage:[UIImage imageNamed:@"7.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 8)
    {
        [button8 setImage:[UIImage imageNamed:@"8.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 9)
    {
        [button9 setImage:[UIImage imageNamed:@"9.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 10)
    {
        [button10 setImage:[UIImage imageNamed:@"10.png"] forState:UIControlStateNormal];
        return;
    }else if (numLitInt == 11)
    {
        [button11 setImage:[UIImage imageNamed:@"11.png"] forState:UIControlStateNormal];
        return;
    }

}

和

- (IBAction)buttonPushed:(id)sender;
{
    //creat random array of buttons
    [self randomArray];
     float dalay=1.0f;
    //loop through each button in array and turn them on and off
    for (NSString *i in gameArray) 
    {
        int butNum = [i intValue];

        NSNumber *num = [[NSNumber alloc] initWithInt:butNum];

        //turn button on
        [self buttonLit];

        //turn button off
        [self performSelector:@selector(buttonUnLit) withObject:num afterDelay:delay];
        delay+=0.5f;
       [num release];

    }

}