Add UIScrollView in UIView programmatically

问题:

I have a question how to add UIScrollView in UIView, so that the UIScrollView could work properly.

UIScrollView *scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, container.frame.size.width/2, container.frame.size.height/2)];
scroll.pagingEnabled = YES;
scroll.scrollEnabled = YES;
[scroll setBackgroundColor:[UIColor redColor]];
NSInteger numberOfViews = 3;
for (int i = 0; i < numberOfViews; i++)
{
    CGFloat xOrigin = i * container.frame.size.width/2;
    UIView *awesomeView = [[UIView alloc] initWithFrame:CGRectMake(xOrigin, 0, container.frame.size.width, container.frame.size.height)];
    awesomeView.backgroundColor = [UIColor colorWithRed:0.5/i green:0.5 blue:0.5 alpha:1];
    [scroll addSubview:awesomeView];
    [awesomeView release];
}
scroll.contentSize = CGSizeMake(container.frame.size.width/2 * numberOfViews, container.frame.size.height);
[container addSubview:scroll];

Above code is from tutorial: http://idevzilla.com/2010/09/16/uiscrollview-a-really-simple-tutorial/ But it doesn't work for me.

EDIT:

If you have a problem that you have set up a scrollview properly but it's not working, make sure that you are not overlaying with another UIView your scrollview. That was my problem. Solved!

回答1:

Try this :

{
    scrollview=[[UIScrollView alloc]initWithFrame:CGRectMake(0,0,320,480)]; 
    scrollview.showsVerticalScrollIndicator=YES;
    scrollview.scrollEnabled=YES;
    scrollview.userInteractionEnabled=YES;
    [self.view addSubview:scrollview];
    scrollview.contentSize = CGSizeMake(width,height);
    [scrollview release];
}

回答2:

your

scroll.contentSize = CGSizeMake(container.frame.size.width * numberOfViews, container.frame.size.height);

回答3:

[container addSubview:scroll];

Add this line before your for loop.

回答4:

You can use below code to add UIScrollView on yourView :-

Step 1:

Delegate "UIScrollViewDelegate" to your ViewController.h

for example:
  @interface yourViewController:UIViewController<UIScrollViewDelegate> 

Step 2:

//create you UIScrollView
UIScrollView  *MyScrollVw= [[UIScrollView alloc]initWithFrame:CGRectMake(0 ,0 ,320 ,480)]; 
MyScrollVw.delegate= self;
[MyScrollVw setShowsHorizontalScrollIndicator:NO];
[MyScrollVw setShowsVerticalScrollIndicator:YES];
MyScrollVw.scrollEnabled= YES;
MyScrollVw.userInteractionEnabled= YES;
[yourView addSubview:MyScrollVw];
MyScrollVw.contentSize= CGSizeMake(320 ,1500);//(width,height)

Step 3:

you want to implement the scrollView Delegates in ViewController.m

-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
   return imgView;
}
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
   NSLog(@"Did end decelerating");
   //do your code here
}   
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
   NSLog(@"Did scroll");
   //do your code here
}
-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
    NSLog(@"Did end dragging");
   //do your code here
}
-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
    NSLog(@"Did begin decelerating");
   //do your code here
}
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
   NSLog(@"Did begin dragging");
   //do your code here
}