English 中文(简体)
使用 CoreGriphics 来动画颜色与目标C 中梯度的颜色之间的动画吗?
原标题:Animating between colors with a gradient in Objective-C using CoreGraphics?

所以,我这样做是为了通过一系列的颜色 来动画一个iOS 应用程序:

[UIView animateWithDuration:3.0 animations:^{
                gradient = CGGradientCreateWithColorComponents(colorSpace, colors, locations, number_of_locations);
                CGContextDrawRadialGradient(context, gradient, start, 0, end, sqrt((self.frame.size.width*self.frame.size.width)+(self.frame.size.height*self.frame.size.height)), kCGGradientDrawsBeforeStartLocation); 
        }];

It works, for the most part. Each time I change a color it flickers with a completely opposite color. For example, when it s about to turn orange from red, it flickers with green. Community, how fix? :D

谢谢

最佳回答

使用 CAGRadientLayer 。 colors 属性是可想象的。

上面使用的代码并没有改变任何可想象的属性, 上下文( pun 意图) 也有点缺乏, 所以我不确定它是如何“ 工作 ” 的- 它看起来不像一个有效的动画块 。

问题回答

暂无回答




相关问题
images sliding continuously with <table> and jQuery

I m trying to write a little test page that circulates images through a window (see image). I have colored boxes inside a table (gray border), with each box being a element. <table id="boxes" ...

WPF 3d rotation animations

I have a few 3d rectangles on my screen that I want to pivot around the Y axis. I want to press down with the mouse, and rotate the 3d object to a max rotation, but when the user moves their mouse, ...

Disable Windows 7 touch animation in WPF

In Windows 7 when you touch the screen there is a short animation that occurs at the touch point. In my WPF app I want to display my own touch points, without showing the one supplied by Windows. ...

jQuery block moving

I wanna move a div block to the top, so I coded like this: CSS part: .movingPart{ margin-top:80px; } jQuery part: $(document).ready(function() { $( #btn ).click(function() { $( .movingPart )....

Direct 2D gnuplot PNG animation?

Can anyone please confirm that yes/no Gnuplot 4.5 (on CVS) can output 2D animated PNG files? I have numerous datasets but one line that I d like to show iteratively in 3 different places in my graph. ...

Visual State Manager VS Animations in WPF

There is a lot of talk about the simplicity of Visual States and the transitions between them in WPF/Silverlight. I have the need to generate animations dynamically at runtime, to animate the ...

Create a ImageIcon that is the mirror of another one

I ll like to know if there is a way to create a ImageIcon that is the mirror of another ImageIcon. Searching on Google, I found how to do it by using many AWT libraries. Is there a way to do it with ...

how to drag in the animation in iphone application?

Iphone application is using the static co-ordinates to reach at some points in the application,which is based on the button event. But what i want is when i drag the item than it should reach at some ...

热门标签