uiview

问题 I have a UIViewController and a UICollectionViewController . I add the UICollectionViewController to the UIViewController using the following: UICollectionViewFlowLayout* flowLayout = [[UICollectionViewFlowLayout alloc]init]; [flowLayout setScrollDirection:UICollectionViewScrollDirectionHorizontal]; self.toolsCollectionViewController = [[ToolsCollectionViewController alloc] initWithCollectionViewLayout:flowLayout]; self.toolsCollectionViewController.view.backgroundColor = [UIColor clearColor]

问题 I'm trying to animate 3 squares from the left to the right. The squares should reappear from the left while they are disappearing from the right. The idea is that the squares represent clouds, so the idea is clear. This is what I currently got: class ViewController: UIViewController { // contains the squares @IBOutlet weak var containerView: UIView! override func viewDidLoad() { super.viewDidLoad() } override func viewDidAppear(_ animated: Bool) { super.viewDidAppear(animated) startAnimating(

问题 I want to display a progress indicator at the center of the screen, NOT the view. It should be the center of the view because the view is scrollable. Most answers only tells how to center it in the view. I have this code: let screenBound = UIScreen.main.bounds let progressIndc = UIActivityIndicatorView() progressIndc.frame = CGRect(x: screenBound.width / 2 - 10, y: screenBound.height / 2 - 10, width: 20, height: 20) progressIndc.hidesWhenStopped = true progressIndc.color = UIColor.gray

问题 I want to display a progress indicator at the center of the screen, NOT the view. It should be the center of the view because the view is scrollable. Most answers only tells how to center it in the view. I have this code: let screenBound = UIScreen.main.bounds let progressIndc = UIActivityIndicatorView() progressIndc.frame = CGRect(x: screenBound.width / 2 - 10, y: screenBound.height / 2 - 10, width: 20, height: 20) progressIndc.hidesWhenStopped = true progressIndc.color = UIColor.gray

问题 I want to display a progress indicator at the center of the screen, NOT the view. It should be the center of the view because the view is scrollable. Most answers only tells how to center it in the view. I have this code: let screenBound = UIScreen.main.bounds let progressIndc = UIActivityIndicatorView() progressIndc.frame = CGRect(x: screenBound.width / 2 - 10, y: screenBound.height / 2 - 10, width: 20, height: 20) progressIndc.hidesWhenStopped = true progressIndc.color = UIColor.gray

问题 I want to display a progress indicator at the center of the screen, NOT the view. It should be the center of the view because the view is scrollable. Most answers only tells how to center it in the view. I have this code: let screenBound = UIScreen.main.bounds let progressIndc = UIActivityIndicatorView() progressIndc.frame = CGRect(x: screenBound.width / 2 - 10, y: screenBound.height / 2 - 10, width: 20, height: 20) progressIndc.hidesWhenStopped = true progressIndc.color = UIColor.gray

问题 I have a UITableView inside a UIView inside a UIScrollView. Problem: when i scroll/drag the tableview, the scrollview scrolls too. What i need is for the tableview not to pass the scroll to the scrollview. Also i need to be able to use the scrollview when i scroll it directly. How can i do this? Cheers 回答1: I fixed it using "hitTest" on the tableview. - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event If the event originated within the tableview, i disable the parent's scrollview

问题 I am trying to create a custom UIView/Scrollview named MyScrollView that contains a few labels (UILabel), and these labels receive tap gestures/events in order to respond to user's selections . In order to make the tap event work on the UILabels, I make sure they all have userIteractionEnabled = true and I created a delegate as below: protocol MyScrollViewDelegate { func labelClicked(recognizer: UITapGestureRecognizer) } The custom UIView is being used in ScrollViewController that I created,

问题 Here's some relevant code inside a UIView subclass : - (void) doMyCoolAnimation { CABasicAnimation* anim = [CABasicAnimation animationWithKeyPath:@"position.x"]; anim.duration = 4; [self.layer setValue:@200 forKeyPath:anim.keyPath]; [self.layer addAnimation:anim forKey:nil]; } - (CGFloat) currentX { CALayer* presLayer = self.layer.presentationLayer; return presLayer.position.x; } When I use [self currentX] while the animation is running, I get 200 (the end value) rather than a value between 0

问题 Here's some relevant code inside a UIView subclass : - (void) doMyCoolAnimation { CABasicAnimation* anim = [CABasicAnimation animationWithKeyPath:@"position.x"]; anim.duration = 4; [self.layer setValue:@200 forKeyPath:anim.keyPath]; [self.layer addAnimation:anim forKey:nil]; } - (CGFloat) currentX { CALayer* presLayer = self.layer.presentationLayer; return presLayer.position.x; } When I use [self currentX] while the animation is running, I get 200 (the end value) rather than a value between 0