We are developing a map based application which displays large number of annotations above the map using MKMapKit.
We are using a scrollview placed above MapView for differentiating between pinch and drag gestures. We are able to differentiate between pinch and drag but the responsiveness of the Application becomes sluggish while dragged.
We will appreciate any suggestions for improving responsiveness of map while using the scrollview above MapView.
Thanks in advance.
Combining MKMapView and UIScrollView was always a bad idea. Try not to use it. Use UIView with gesture recognizers over the map instead.
Related
I have a view based application. I have to add features like pinch zoom and double tap to zoom the page(UIView) in the iOS application. Its easy to zoom a UIScrollview.
I should create a framework which has the option to pan and zoom the entire app. How do a achieve to zoom a view based application? I welcome your ideas!
The best way to do it, is to put the entire app components in one scrollview and use the zooming of the control.
The other way which is not as stable as the first one, is to scale all objects inside the UIVIEW larger or smaller depending on the pinch zoom, but keep in mind that scaling will affect the look of the entire application, so you need to adjust the position of each object accordingly.
You can create your own zoom functionalities in a UIView by using UIGestureRecognizer and CALayer transform property. Ex. scaling and change the anchorPoint base on the focus point.
I've seen iOS apps that allow users to scroll around a view that is larger than the screen itself, without seeming to implement a UIScrollView mechanic. So for example, the actual image displayed on the screen is double the width of the screen, and the user can pan left and right to view all the content. Is this just a case of making the ViewController's width twice that of the screen and allowing some kind of panning via gesture recognizers? With what I'm trying to do, it seems like this would be easier that implementing a UIScrollView...
Implementing scrollview is much easier than handling pan gesture, when Apple has given built-in functionality then why you do not want to use it?
You can either use UIPangestureRecognizer or UIscrollview. The Latter option is very simple.
I have some map images and i want that i can scroll that images and i can zoom that images.
Like , MKMapView we can zoom images and the placeMark will remains as it is (it would not zoom).
same thing i want to do without MKMapView with my static images.with the help of scrollview or any other.
is it possible ?,is there any code available?
The class you are looking for is called CATiledLayer. Be warned, it is not trivial. Try reading Matt Gallagher's excellent write up.
I have a UIScrollView and an UIImageView as its subview. I want to draw on the imageview in response to the single touches. And I want to zoom and pan the image view in the scroll view on pinch and pan gestures respectively. I found many solutions. But its not perfect. Please give me a straight forward solution.
use after subclassing UIScrollview.See the link.If you are doing application for iphone4 OS,try to use UIGestureRecogniser.see the sample code for it in Apple site.
If you are only using the scrollview for panning and zooming, I would suggest subclassing UIImageView to provide that functionality yourself along with the drawing. This will allow you to have finer control over it and quicker code. A scrollview is not very good at allowing complex gestures within it. (other than taps)
I created a minesweeper clone game in iphone. My implementaion of the cells in the grid is this, I created a UIView and added buttons in the UIView and then I added the UIView in a UIScrollView, but every time I zoom out or zoom in using zoomToRect method of UIScrollView the zooming is not smooth and the zoom out was distorted. How can implement smooth zooming in UIScrollView?
I would try rendering your content view into a bitmap image when scrolling or zooming begins, and replacing the large grid of buttons with the bitmap until the scrolling/zooming is completed. The UIScrollViewDelegate protocol should provide you with the necessary information to know when to swap the bitmap in or out. Part of the problem is that your content view is so computationally intensive to render (all those buttons).
A more sophisticated approach would be to re-implement your game grid at a lower level using coreanimation and more fundamental touch event handling, but that might be overkill if the bitmap hack works well enough.
You know how in the maps app, while panning or zooming, there are grey tiles that show up? That means that the iPhone is currently downloading the tiles. In Safari, there is a similar effect where Safari lays down checkered grey instead of webpage, as it is currently rendering it and will be just a moment. Both of these mean that scrolling will not wait for content to load before displaying the area, it will let scrolling be smooth.
You could try looking here [http://stackoverflow.com/questions/1098234/optimized-image-loading-in-a-uiscrollview] for some ideas, and a point in the right direction would be to use threading to load views in the background while displaying grey in its place.