UIImagePickerController只支持竖屏模式

Question

根据IOS文档说明，**The UIImagePickerController class supports portrait mode only**，就是UIImagePickerController类只能支持竖屏模式，有没有什么方法能让横屏显示？

Answer 1

可以用ALAssetsLibrary 获取设备中的图片，然后像uiimagepicker一样显示为横屏和竖屏

- (void)viewDidLoad
{
    [super viewDidLoad];
    [activity startAnimating];


    appObj=(ImagePickerAppDelegate *)[[UIApplication sharedApplication]delegate];

    void (^assetEnumerator)(struct ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop)
    {
        if(result != NULL) 
        {
            //assets is a mutualable array...for storing the images that are in the device..
            [assets addObject:result];
        }
    };

    void (^assetGroupEnumerator)(struct ALAssetsGroup *, BOOL *) =  ^(ALAssetsGroup *group, BOOL *stop) 
    {
        if(group != nil)
        {
            [group enumerateAssetsUsingBlock:assetEnumerator];
        }
        //meth is a user defined method..   
        [self meth];
        [activity stopAnimating];
        [activity setHidden:YES];
    };
    assets = [[NSMutableArray alloc] init];
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    [library enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:assetGroupEnumerator 
                         failureBlock: ^(NSError *error) { NSLog(@"Failure");}];
}


-(void)meth
{
    NSLog(@"%i",[assets count]);

    if(userOrientation==UIInterfaceOrientationPortrait || userOrientation==UIInterfaceOrientationPortraitUpsideDown)
    {
        NSLog(@"haii");
        [scrollView removeFromSuperview];

        scrollView=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 460)];
        scrollView.backgroundColor=[UIColor whiteColor];

        NSLog(@"%i",[assets count]);
        for (int i = 0; i < [assets count]; i++) 
        {
            imgBtn = [UIButton buttonWithType:UIButtonTypeCustom];
            [imgBtn setFrame:CGRectMake((i%4*80)+2,(i/4*80)+2,75,75)];
            imgBtn.tag=i;
            [imgBtn addTarget:self action:@selector(imageClicked:) forControlEvents:UIControlEventTouchUpInside];
            ALAsset *asset=[assets objectAtIndex:i];
            [imgBtn setImage:[UIImage imageWithCGImage:[asset thumbnail]] forState:UIControlStateNormal];
            [scrollView addSubview:imgBtn];
        }
        scrollView.contentSize = CGSizeMake(320,(([assets count]/4)+1)*300 );
    }

    if(userOrientation==UIInterfaceOrientationLandscapeRight || userOrientation==UIInterfaceOrientationLandscapeLeft)
    {
        [scrollView removeFromSuperview];
        scrollView=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 480,320)];
        for (int i = 0; i < [assets count]; i++) 
        {
            imgBtn = [UIButton buttonWithType:UIButtonTypeCustom];
            [imgBtn setFrame:CGRectMake((i%6*80)+2,(i/6*80)+2,75,75)];
            imgBtn.tag=i;
            [imgBtn addTarget:self action:@selector(imageClicked:) forControlEvents:UIControlEventTouchUpInside];
            ALAsset *asset=[assets objectAtIndex:i];
            [imgBtn setImage:[UIImage imageWithCGImage:[asset thumbnail]] forState:UIControlStateNormal];
            [scrollView addSubview:imgBtn];
        }
        scrollView.contentSize = CGSizeMake(480,(([assets count]/4)+1)*300);
    }
    [self.view addSubview:scrollView];
}



-(void)imageClicked:(UIButton *)sender
{
    //for picking the images that the user has selected we are using other array "selectedImages" i.e declared in the app delegate
    ALAsset *asset=[assets objectAtIndex:sender.tag];
    [appObj.selectedImages addObject:[UIImage imageWithCGImage:[[asset defaultRepresentation] fullScreenImage]]];
    NSLog(@"%i",[appObj.selectedImages count]);
    [self.navigationController popViewControllerAnimated:YES ];
}