uiscrollview

问题 I have UIScrollView that contains images from the server. I should put Activity Indicator while the image is currently loading. UIScrollView contains dynamic number of images from the server. May I know how can I add activity indicators on each page while the image is loading and remove once image is loaded. Here's my code to retrieve images: NSDictionary *items = [NSDictionary dictionaryWithObject:dictInfo forKey:@"images"]; imageList = [items objectForKey:@"images"]; NSArray *img =

问题 So, i got this Navigation-based App (with a custom NavigationBar - Category) and I have 2 problems here... @implementation UINavigationBar (Custom) - (void)drawRect:(CGRect)rect { UIImage *image = [UIImage imageNamed: @"bg_toolbar.png"]; [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; } @end Because of the Navigation-based App, most of the views have a height of 436px (= ScreenSize - NavigationBar height, as you probably know ;). I got one view similar to

问题 The scrolling on my UICollectionView is really choppy. As I scroll past half the screen, it gets stuck for a moment and then proceeds. How can I make the scrolling more smooth using SWIFT? 回答1: Use Time Profiler instrument to find out where the bottleneck is. Swift has nothing to do with scroll view's performance. 回答2: There are two complementary ways: 1) [Fast way] When choppy effect is large enough for giving you time for pressing pause button on the debugger. And then review what is doing

问题 I am showing images in UIScrollView with UIImageView.I added UIGestureRecognizer to each ImageView and also I am setting tag property of Image View.I want tag of Image view on Tap on particular Image View.But I am only getting Tag of last ImageView.Pasting Code below.Your help will be appreciated. UITapGestureRecognizer *tapRecognizer; tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageViewDidTapped:)]; tapRecognizer.numberOfTapsRequired = 1;

问题 I have a UIView which contains a zoomable UIImageView and also another semitransparent UIView on top of that. What I am trying to achieve is to be able to zoom the UIImageView while keeping the semitransparent view static and not zoomed. If I add the semitransparent UIView on top of the UIImageView (which is added to the UIScrollView ), everything zooms. However, if I add both as subviews to the base UIView , the touches only get tracked is the semitransparent UIView since its the last one

问题 I am currently dynamically adding a UIImage to my UIScrollView object and everything is working as intended. I need to add extra functionality now (a UIActivityIndicator in the center of the image when it is loading from the internet, and a label underneath) so I thought why not create a custom View which has all of these laid out as I need them to be, and then just load it into the scrollView. I have encountered a problem though, when I add it to the scrollView, nothing shows up. Here is

问题 full file follows: trying to have full scroll vertical in android device but putting scroll view at end of file produces crash `<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen

问题 I'm attempting to build a UI in Xamarin.iOS which allows a user to vertically scroll through a list of images. I'm unsure what the best approach would be. I have looked at using UITableViewSource however I'm not sure if this would be the best approach. The data that I want to display is not really tabular it's just a list of images. Is there a way to mould UITableViewSource to just show an image that's as wide as the screen, allowing the user to scroll down through them. Or would a better

问题 I am using UIScrollview to load my two views let say A and B . It exactly looks like the below picture. I set PagingEnabled as YES and DirectionLockEnabled as YES . When I drag the view from A to B it goes diagonally. Please find the code below, - (void)setupScrollView:(UIScrollView*)scrMain { for (int i = 0; i < 2; i++) { if (i == 0) { // View A [ViewA setFrame:CGRectMake((i)*scrollview.frame.size.width + 20, 0, scrollview.frame.size.width - 40, ViewA.frame.size.height)]; [scrollview

问题 I am writing program to move an UIView named "myView" while scrolling a UITableView, Look at the pic below: "myView" will change its 'y-coordinate' along with the change of the contentoffset of tableview, the main code I write is: func scrollViewDidScroll(scrollView: UIScrollView) { let off_y = scrollView.contentOffset.y let new_y = originalMyViewY - off_y if new_y <= 0 { print("bad new_y : \(new_y)") return } else { print("right new_y: \(new_y)") } var frame = self.myView.frame frame.origin