Ios 尝试使照片随机化并显示一次

好的，我正在处理这个应用程序，我有一个问题。。。到目前为止，设置是这样的。我有16个按钮设置为图像。我在所有按钮上都设置了arc4random（）%16，这样所有按钮都有均等的机会成为16个图像中的一个。我为每种图片类型设置了一个switch语句，并使每种情况都等于一个不同的图像。现在，我想要的是所有的图像都被使用一次。。。应用程序运行时没有重复，我只希望它们以随机顺序排列。我有办法做到吗？目前，当我运行应用程序时，一些图像会出现不止一次，因为每个按钮都可以是16个图像中的一个。我只希望图像出现一次。我不知道该怎么办，也许在每个案例中添加16条if/if-else语句？？？请帮忙！！！ 下面是我的第一个switch语句的当前语法。谢谢

-(void)Picture1SelectedType{

switch (Picture1Type) {
    case 0:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Plastic-Brick-Man@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];

    }
        break;
    case 1:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Games-Console---1@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 2:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Old-Telephone@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 3:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Scarf@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 4:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Camera@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 5:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Tea-Cup@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 6:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Fruit-Computer---3@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 7:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Sugary-Drink@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 8:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Fruit-Computer@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 9:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Pocket-Watch@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 10:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Starship@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 11:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Games-Controller---1@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 12:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Two-tone-Shoe@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 13:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Lightbulb@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 14:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Bike@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;
    case 15:
    {
        UIImage *pictureImage = [UIImage imageNamed: @"Flower-Vase@Low.png"];
        [Picture1 setImage:pictureImage forState:UIControlStateNormal];
        [self.view addSubview:Picture1];
    }
        break;

    default:

        break;
}

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将图像添加到数组中，然后使用代码随机洗牌数组