Animate the views by changing the property values dynamically and redrawing the view. Im using the uiview animation method to animate its bounds increasing both its width and height. The view transition starts immediately unless another animation is already inflight, in which case it starts immediately after the current animation finishes. During an animation, user interactions are temporarily disabled for the views being animated. The option to redisplay the view when the bounds change by invoking the set needs display method. Introduction to drawing in ios using xcode 9 and swift 4.
Redrawing of views is the major cause of the reduction in fps and. Cgfloat 60 let animator uiviewpropertyanimatorduration. Prior to ios 5, user interactions are disabled for the entire application. You have read in part i of this series that uiview owns six animatable properties, which means you can use one of the class animation methods to animate transitions between positions, colors or transformations smoothly and with low cpu impact on a background chain. With open architecture, uiview is designed to make it easy for software authors to write addon applications that provide additional functionality. The uiview animating protocol defines the methods for implementing the basic flow control for animations, including the ability to start, stop, and pause animations. In twui, there is a method called redraw on tuiview. How do i redraw a uiviews sublayers as im animating the uiviews. So ive decided to fix it and describe a few tricky transitions that i have recently made. Setting it to uiviewcontentmoderedraw does not seem to be calling out to drawrect at all during the animation. Start the animation from the current setting associated with an already inflight animation. How to animate uiview with scale and layer position.
This block has no return value and takes a single boolean argument that indicates whether or not the animations actually finished before the completion handler was called. In uikit animations, it is recommended to modify only the animatable properties. Lets start with a basic method in uiview, called animate. There are a lot of articles about simple transition animations for beginners and lack of advanced ones. Since this is the default curve for a uiview animation, we can now refactor our code to this. Performing ios animations on views with uikit and uiview. This method performs the specified animations immediately using the curve ease in out and transition none animation options. If the duration of the animation is 0, this block is performed at the beginning of the next run loop cycle. Different block animations at work in the block animations demo in the demo projects folder of ioslib.
In ios, all drawing to the screenregardless of whether it involves opengl, quartz, uikit, or core animation occurs within the confines of an instance of the uiview class or a subclass thereof. Ui animations with swift better programming medium. These effects are perfect for tool and utilitytype apps and adding them as. There are two versions of uiview, the original uiview sometimes referred to as uiview16, and ui view32. In each view i have overriden drawrect method and drawn several circles. Additional settings like the curve or allowing interactions during the animation.
It forces the view to redraw, but it also comes with a free fading animation between the old and new state of. This is often a mixture of position changes and scaling mainly just a views frame to another views frame animation. In my project i have several uiview and uiviewcontroller. Core animation will also automatically calculate and draw all the. Uiviewanimating uikit apple developer documentation. Sooner or later an ios developer needs custom animations between views. Uiviewanimationoptions uikit apple developer documentation. In this tutorial, youll learn to chain the basic uiview animations. Better still, theyre also a great way to draw a users attention any time new or.