Question

我有44个按钮，我正在添加到scrollview中，我试图使用一系列数组来执行此操作。我有文件名的名称字符串数组，图片的Y大小（所有x都是相同的）和其他几个。

我在viewDidLoad中运行该方法的代码是：

for (int i = 0; i < 44; i++) {
    [self makeLabelsAndButtons:i];
}

方法makeLabelsAndButtons在这里：

-(void)makeLabelsAndButtons:(NSInteger *)indexPath{
NSString *nameString = [nameArray objectAtIndex:indexPath];
NSString *picString = [picArray objectAtIndex:indexPath];
NSInteger picNumb = [[numbers objectAtIndex:indexPath] integerValue];
NSInteger picXnum = [[picXCoords objectAtIndex:indexPath] integerValue];

Button = [UIButton buttonWithType:UIButtonTypeCustom];
[Button addTarget:self action:@selector(presPressed:)
  forControlEvents:UIControlEventTouchUpInside];
Button.frame = CGRectMake(160.0, 240.0, 220.0, picNumb);
Button.center = CGPointMake(picXnum, 200.0);
[Button setBackgroundImage:[UIImage imageNamed:picString] forState: UIControlStateNormal];
[ScrollView addSubview:Button];
[ScrollView insertSubview:Button atIndex:1];

NSLog(@"name: %@, pic:%@, picY:%i", nameString, picString, picNumb);

}

没有添加按钮，但我没有错误。我真的不确定我做错了什么

感谢您的帮助！

编辑：这是我初始化我的scrollview

的方式

ScrollView=[[UIScrollView alloc]initWithFrame:CGRectMake(0,0,320,480)];
ScrollView.showsVerticalScrollIndicator=YES;
ScrollView.scrollEnabled=YES;
ScrollView.bounces = YES;
ScrollView.userInteractionEnabled=YES;
[self.view addSubview:ScrollView];
[self.view insertSubview:ScrollView atIndex:1];
ScrollView.contentSize = CGSizeMake(20000,480);

通过NSLogs系统，我确定按钮没有被添加到视图中，我不知道为什么。

Answer 1

根据以下内容更改您的代码.....它可能有效

[Button setBackgroundImage:[UIImage imageNamed:picString] forState: UIControlStateNormal];

将上面的内容替换为

NSString *path = [[NSBundle mainBundle] pathForResource:@"picString" ofType:@"png"];
[Button setBackgroundImage:[[UIImage alloc] initWithContentsOfFile:path] forState: UIControlStateNormal];

Answer 2

我假设您在控制器上声明了两个属性Button和ScrollView。

将属性ScrollView重命名为scrollView以提高可读性。

@property (nonatomic, weak) IBOutlet UIScrollView *scrollView;

删除属性Button，因为您不需要它。

更新您的代码：

Button *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button addTarget:self action:@selector(presPressed:) forControlEvents:UIControlEventTouchUpInside];
button.frame = CGRectMake(160.0, 240.0, 220.0, picNumb);
button.center = CGPointMake(picXnum, 200.0);
[button setBackgroundImage:[UIImage imageNamed:picString] forState: UIControlStateNormal];
[self.scrollView addSubview:button];

您无需同时添加子视图并插入它。

可能是您没有分配ScrollView并且向nil对象发送消息不会给您带来错误。您需要确认self.scrollView不是nil，如果是，则检查它是否在您的视图中正确连接。

Answer 3

您的scrollView似乎可以水平滚动。

你可以尝试

-(void)addButtonsToScrollView
{
    //X Offset for button seperation 
    CGFloat xOffset = 10.0f;

    NSUInteger buttonCount = 0;
    //In each iteration buttonFrame would be adjusted to next buttonFrame
    //This would be used to find the contentSize of scrollView
    CGRect buttonFrame = CGRectMake(xOffset, 240.0, 220.0, 40.0f);
    while (buttonCount<44)
    {
        NSString *nameString = nameArray[buttonCount];
        NSString *picString = picArray[buttonCount];

        CGFloat picNumb = [numbers[buttonCount] floatValue];
        CGFloat picXnum = [picXCoords[buttonCount] floatValue];

        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

        [button addTarget:self
                   action:@selector(presPressed:)
         forControlEvents:UIControlEventTouchUpInside];

        buttonFrame.origin.y = (scrollView.frame.size.height - picNumb)/2;
        buttonFrame.size.height = picNumb;
        button.frame = buttonFrame;

        [button setBackgroundImage:[UIImage imageNamed:picString]
                          forState: UIControlStateNormal];
        [button setTitle:nameString
                forState:UIControlStateNormal];

        [scrollView addSubview:button];

        buttonFrame.origin.x += buttonFrame.size.width+xOffset;
        buttonCount++;

    }

    CGSize contentSize = scrollView.frame.size;
    contentSize.width = buttonFrame.origin.x;
    scrollView.contentSize = contentSize;

}

使用数组创建按钮

3 个答案: