Question

我有10个图像阵列和10个按钮，我想要的是随机设置图像到按钮。

我试过这个但没有成功

int index = arc4random() % 10;

UIImage *img = [UIImage imageNamed:[arrayAnsewrImages objectAtIndex:index]];

[self.btnAnswerImage1 setBackgroundImage:[UIImage imageNamed:img] forState:UIControlStateNormal];

这是方法的代码，m使用：

[self.arrayQuestionImages addObject:@"bear.jpg"];
[self.arrayQuestionImages addObject:@"girraf.jpg"];
[self.arrayQuestionImages addObject:@"hippo.jpg"];
[self.arrayQuestionImages addObject:@"monkey.jpg"];
[self.arrayQuestionImages addObject:@"piglet.jpg"];
[self.arrayQuestionImages addObject:@"pumba.jpg"];
[self.arrayQuestionImages addObject:@"rabbit.jpg"];
[self.arrayQuestionImages addObject:@"simba.jpg"];
[self.arrayQuestionImages addObject:@"snake.jpg"];
[self.arrayQuestionImages addObject:@"tigger.jpg"];
[self.arrayQuestionImages addObject:@"turtle.jpg"];
int index = arc4random() % 10;

UIImage *img = [UIImage imageNamed:[arrayQuestionImages objectAtIndex:index]];


switch (index)
{   

    case 0:
    {   
        //[self.btnQuestionImage1 setBackgroundImage:[UIImage imageNamed:img] forState:UIControlStateNormal];
        [self.btnAnswerImage1 setImage:img forState:UIControlStateNormal];

    }
        break;
    case 1:
    {
        [self.btnQuestionImage2 setImage:img forState:UIControlStateNormal];    
    }               
        break;
    case 2:
    {
        [self.btnQuestionImage3 setImage:img forState:UIControlStateNormal];    

    }   
        break;
    case 3:
    {
        [self.btnQuestionImage4 setImage:img forState:UIControlStateNormal];

    }
        break;
    case 4:
    {
        [self.btnQuestionImage5 setImage:img forState:UIControlStateNormal];    

    }   
        break;  
    case 5:
    {
        [self.btnQuestionImage6 setImage:img forState:UIControlStateNormal];    

    }   
        break;  
    case 6:
    {
        [self.btnQuestionImage7 setImage:img forState:UIControlStateNormal];    

    }   
        break;  
    case 7:
    {
        [self.btnQuestionImage8 setImage:img forState:UIControlStateNormal];

    }   
        break;  
    case 8:
    {
        [self.btnQuestionImage9 setImage:img forState:UIControlStateNormal];    

    }   
        break;  
    case 9:
    {
        [self.btnQuestionImage10 setImage:img forState:UIControlStateNormal];   

    }   
        break;  



    default:
    {
        [self.btnQuestionImage1 setImage:img forState:UIControlStateNormal];

    }
        break;
} 
}

M在我的每个按钮上获取空白/零图像。请建议我任何选择。

Answer 1

UIImage * img = [UIImage imageNamed：[arrayAnswerImageNames objectAtIndex：index]]; [self.btnAnswerImage1 setBackgroundImage：img forState：UIControlStateNormal];

Answer 2

您需要将图像名称放在数组中。

您正在尝试将uiimage对象传递给imagedNamed构造函数

Answer 3

在你的代码中奇怪，没有什么事情让我感到震惊，但是我会检查一些小事......

您对[UIImage imageNamed:]的调用需要将字符串作为参数，但出现（至少通过数组的名称），您将在UIImage对象中传递。代码应该是以下之一：

UIImage *img = [UIImage imageNamed:[arrayAnswerImageNames objectAtIndex:index]];  // Note "Names" array

或：

UIImage *img = (UIImage *)[arrayAnswerImages objectAtIndex:index];

取决于您想要如何构建“图像”数组;带有图像或图像名称。另外，我假设按钮的框架已设置，并且它们被添加到视图中？

希望你把它分类。

的修改

只是查看了您的其他代码。只是一个想法 - 你初始化了你的数组arrayQuestionImages？确保你打电话给类似的东西：

self.arrayQuestionImages = [NSMutableArray arrayWithCapacity:10];

在添加对象之前。

此外，以上面显示的方式使用switch语句看起来有点混淆。就个人而言，我会做以下事情：

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.questionImageNames = [NSArray arrayWithObjects:@"bear.jpg", @"girraf.jpg", @"hippo.jpg", @"monkey.jpg", @"piglet.jpg", @"pumba.jpg", @"rabbit.jpg", @"simba.jpg", @"snake.jpg", @"tigger.jpg", @"turtle.jpg", nil];


    NSMutableArray *buttonArray = [NSMutableArray arrayWithCapacity:10];

    for (int i = 0; i < NUM_BUTTONS; i++) {
        NSUInteger index = arc4random() % NUM_BUTTONS;

        UIButton *newButton = [UIButton buttonWithType:UIButtonTypeCustom];
        newButton.frame = CGRectMake(i * x, i * y, width, height);    // Whatever position and size you need...

        UIImage *buttonImage = [UIImage imageNamed:[self.questionImageNames objectAtIndex:index]];
        [newButton setBackgroundImage:buttonImage forState:UIControlStateNormal];

        [self.view addSubview:newButton];
        [buttonArray addObject:newButton];
    }

    self.myButtons = buttonArray;   // Where myButtons is a NSArray property of your class, to store references to the buttons.
}

通过Array将UIImages分配给UIButtons

3 个答案: