当模拟器设置为横向模式iOS时，查看不滚动

Question

I went through many blogs, stack flow questions and googled alot, but didn't get any solution to get my ScrollView work. I don't know why but my ScrollView works in portrait mode but not in landscape.

I am developing using xcode 5 for ios 7 devices. I developed my screen using storyboard. I added a ViewController on storyboard, removed the default UIView it contains, and added a ScrollView. In that ScrollView I added my subviews. Then I referenced the ScrollView to the scrollview object in the outlets.

This is my LoginViewController.h

#import <UIKit/UIKit.h>
@interface LoginViewController : UIViewController
@property (nonatomic, retain) IBOutlet UIScrollView *scrollView;
@end

This is my LoginViewController.m

#import "LoginViewController.h"
@interface LoginViewController ()
@end
@implementation LoginViewController
@synthesize scrollView;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
    // Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width, scrollView.frame.size.height);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end

My scrollview scrolls when in portrait mode but not in landscape. Please help me. Thanks in advance.

Answer 1

Reset scroll view content size on screen orientation:

scrollView.contentSize = CGSizeMake(scrollView.frame.size.width, scrollView.frame.size.height);

Scroll view frame most probably will change so you need to re-set content size.

if you have auto layout on set content size inside layoutSubviews:

- (void) layoutSubviews
{
    [super layoutSubviews];
    scrollView.contentSize = CGSizeMake(scrollView.frame.size.width, scrollView.frame.size.height);
}

Note

Content size supposed to be larger than scroll view size. to scroll right?

Answer 2

You want to add scrolling in scroll view check scrollView height.

If scrollView.height > scrollview.content.height scrollview did not scroll. But scrollView.height < scrollview.content.height scrollview will scroll....

So, the scrollview's content height is greater than the scrollview height is necessary for scrolling..

Therefore, you should do something like this:

scrollView.contentSize.height=scrollView.height+50