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我正在使用QLPreviewController來顯示一組文件。然而,它只顯示第一個,我似乎無法滑動或做任何事情來顯示第二個。我究竟做錯了什麼?我必須手動設置嗎?如果是這樣 - 我該怎麼做呢?QLPreviewController只顯示一個文件
這是從我AppDelegate.m:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// normal viewcontroller init here
[self showPreview] ;
return YES;
}
NSArray* documents ;
QLPreviewController* preview ;
- (void) showPreview
{
documents = [[NSArray alloc] initWithObjects: @"photo" , @"photo2" , nil ] ;
preview = [[QLPreviewController alloc] init];
preview.dataSource = self;
preview.delegate = self;
preview.view.frame = [[UIScreen mainScreen] bounds];
//save a reference to the preview controller in an ivar
// self.previewController = preview;
//refresh the preview controller
[preview reloadData];
[[preview view] setNeedsLayout];
[[preview view] setNeedsDisplay];
[preview refreshCurrentPreviewItem];
preview.view.userInteractionEnabled = YES;
//add it
[self.viewController.view addSubview:preview.view];
}
我也宣稱在同一AppDelegate.m文件中的兩個回調函數:
- (id <QLPreviewItem>) previewController: (QLPreviewController *) controller previewItemAtIndex: (NSInteger) index
{
NSString* filename = [documents objectAtIndex:index] ; // @"photo" ;
NSURL* returnURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource: filename ofType:@"jpg" ]] ;
return returnURL ;
}
- (NSInteger) numberOfPreviewItemsInPreviewController: (QLPreviewController *) controller
{
return [documents count];
}