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

Question

我需要以编程方式创建UIButton，然后将它放在创建的UIScrollView上，然后将UIScrollView放在UIView上。如果将这些元素添加到self.view中，则会显示它们，但是当我想嵌套时，则不会显示它们。 这是我到目前为止有：

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

当您设置将成为子视图的视图的框架时，您需要引用将被添加到视图的边界。因此，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 2

很难说没有代码的其余部分，但它可能仅仅是因为你没有加入你的容器视图（bottomView）你的看法？您可以通过在年底加入该做的事：[self.view addSubview: bottomView]

Answer 3

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)]; 

这

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); 

这仅仅是一个建议。