將UIButton添加到UIScrollView，然後將UIScrollView添加到UIView

Question

我需要以編程方式創建UIButton，然後將它放在創建的UIScrollView上，然後將UIScrollView放在UIView上。如果將這些元素添加到self.view中，則會顯示它們，但是當我想嵌套時，則不會顯示它們。 這是我到目前爲止有：

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

當您設置將成爲子視圖的視圖的框架時，您需要引用將被添加到視圖的邊界。因此，我認爲你需要改變幾行：

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

應該是：

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); 

應該是：

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

Answer 2

很難說沒有代碼的其餘部分，但它可能僅僅是因爲你沒有加入你的容器視圖（bottomView）你的看法？您可以通過在年底加入該做的事：[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)]; 

這

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); 

這僅僅是一個建議。