uiscrollview

来源： https://stackoverflow.com/questions/63002344/why-cant-access-the-image-tint-color-from-inside-the-scrollviewdidscroll

来源： https://stackoverflow.com/questions/63002344/why-cant-access-the-image-tint-color-from-inside-the-scrollviewdidscroll

来源： https://stackoverflow.com/questions/63002344/why-cant-access-the-image-tint-color-from-inside-the-scrollviewdidscroll

问题 I'm trying to build something similar to IMessage's and WhatsApp's header in react native, where users can pull down to reveal a search bar in the header. I have been able to pull down to reveal a hidden input, but because the scrollview's y value becomes negative on pull, it will bounce back to y = 0 and prevent the input from sticking to the top. I have tried using both translateY and scaleY to reveal the hidden input. class List extends Component { scrollY = new Animated.Value(0) render()

问题 This is my setup: I have an UIScrollView with leading,top, trialing edge set to 0. Inside this I add an UIStackView with this constraints: stackView.centerYAnchor.constraintEqualToAnchor(selectedContactsScrollView.centerYAnchor).active = true stackView.leadingAnchor.constraintEqualToAnchor(selectedContactsScrollView.leadingAnchor).active = true Inside the stack view I add some views. My issue is that because of the constraints the first view added to stack view will also have leading edge = 0

问题 This is my setup: I have an UIScrollView with leading,top, trialing edge set to 0. Inside this I add an UIStackView with this constraints: stackView.centerYAnchor.constraintEqualToAnchor(selectedContactsScrollView.centerYAnchor).active = true stackView.leadingAnchor.constraintEqualToAnchor(selectedContactsScrollView.leadingAnchor).active = true Inside the stack view I add some views. My issue is that because of the constraints the first view added to stack view will also have leading edge = 0

问题 I have an image in the UIScrollView and I'm trying to make it aspect fill by default, the code below scale it as listed on the first attached image. But it's not what I expect, how to scale it properly? func aspectFill() { let imageSize = imageZoomView.bounds.size let xScale = bounds.width / imageSize.width let yScale = bounds.height / imageSize.height zoomScale = max(xScale, yScale) } But the expected result is 回答1: Make sure your image view is set to .scaleToFill . When you load your image,

问题 I have a problem with scrollview content size or offset I don't know. When I try to scroll view it return back me and stick to the top but as you can see I have button at the bottom of screen and want to scroll to the bottom of the view to see entire NEXT button. Looks like content size is wrong: Here is a repo with my code https://github.com/matrosovDev/swiftui There is a WelcomeView component which include all code, but I will copy paste it here as well, probably using minus values for

问题 I have a horizontal paginated UIScrollView with a UIButton partially covering the scroll view. Like this: UIView | |- UIScrollView | |- UIButton I want to make the UIButton to not trigger on tap-scroll-and-relase-above-the-button (I want the UIScrollView to scroll instead). I want the button to only respond to tap-and-release-without-moving . Can this easy and quickly done? Or should I subclass the UIButton and override -touchesBegan: , etc., to manually pass the touches to the scrollView

问题 This is a new problem I have been having ever since I've been updating my app for iOS 7. Everytime I launch the app on my device or simulator, I get this error code RecipeDetailViewController scrollViewDidScroll:]: message sent to deallocated instance 0x15746c40 and it crashed. I enabled NSZombie and that was the code it gave me. Before it was giving a exc_bad_access code. This is my code for ScrollViewDidSCroll - (void)scrollViewDidScroll:(UIScrollView *)scrollView{ // Depending on how far