Question

我需要以编程方式创建UIButton，然后将其放在已创建的UIScrollView上，然后将UIScrollView放在UIView上。如果将这些元素添加到self.view，则会显示它们，但是当我想要嵌套时，它们不会显示。以下是我到目前为止的情况：

viewWithPictures=[[UIScrollView alloc] initWithFrame:self.bottomView.frame];
viewWithPictures.contentSize=CGSizeMake(160*[smallImagesFromGallery count], self.bottomView.frame.size.height);

viewWithPictures.backgroundColor=[UIColor greenColor];
NSLog(@"Number of small images: %i",[smallImagesFromGallery count]); 

for(int i=0; i<[smallImagesFromGallery count]; i++)
{
    UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom];

    btn.frame=CGRectMake(self.bottomView.frame.origin.x+i*160, self.bottomView.frame.origin.y, 150, 100);

    [btn setBackgroundImage:[smallImagesFromGallery objectAtIndex:i] forState:UIControlStateNormal];
    if (btn==nil) {
        NSLog(@"Button is nil");
    }
    btn.tag=i;
    [btn addTarget:self action:@selector(viewLargeVersion:) forControlEvents:UIControlEventTouchUpInside];
    [viewWithPictures addSubview:btn];



}
[bottomView addSubview:viewWithPictures];

Answer 1

viewWithPictures=[[UIScrollView alloc] initWithFrame:self.bottomView.frame];

到

viewWithPictures=[[UIScrollView alloc] initWithFrame:CGRectMake(0,0,self.bottomView.frame.size.width,self.bottomView.frame.size.height)];

和这个

btn.frame=CGRectMake(self.bottomView.frame.origin.x+i*160, self.bottomView.frame.origin.y, 150, 100);

到

btn.frame=CGRectMake(i*160, self.bottomView.frame.origin.y, 150, 100);

这只是一个建议。

Answer 2

当您设置将成为子视图的视图的帧时，您需要引用它将添加到的视图的边界。所以我认为你需要改变几行：

viewWithPictures=[[UIScrollView alloc] initWithFrame:self.bottomView.frame];

应该是：

viewWithPictures=[[UIScrollView alloc] initWithFrame:self.bottomView.bounds];

和

btn.frame=CGRectMake(self.bottomView.frame.origin.x+i*160, self.bottomView.frame.origin.y, 150, 100);

应该是：

btn.frame=CGRectMake(i*160, 0, 150, 100);

Answer 3

如果没有剩下的代码，很难说它只是因为你没有将容器视图（bottomView）添加到视图中？您可以在最后添加此内容：[self.view addSubview: bottomView]

将UIButton添加到UIScrollView，然后将UIScrollView添加到UIView

3 个答案: