iphone - 如何平滑地上下动画图像。苹果手机

Question

我想平滑地上下动画图像。任何人都知道如何做到这一点..

Answer 1

确保导入以下框架：

#import <QuartzCore/QuartzCore.h> #import <CoreGraphics/CoreGraphics.h>

UIImageView *someImage = .....
CALayer *b = someImage.layer;
// Create a keyframe animation to follow a path to the projected point
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"scale"];
animation.removedOnCompletion = NO;

// Create the path for the bounces
CGMutablePathRef thePath = CGPathCreateMutable();

// Start the path at my current location
CGPathMoveToPoint(thePath, NULL, someImage.center.x, someImage.center.y);
CGPathAddLineToPoint(thePath, NULL,20, 500.0);

animation.path = thePath;

animation.speed = 0.011;
animation.repeatCount = 1000000;

// Add the animation to the layer
[someImage addAnimation:animation forKey:@"move"];

您可以使用这些值，直到获得所需的结果。如果这是您的解决方案，请接受此作为答案。

Answer 2

看一个简单的UIView（UIImageView）动画教程

iPhone 应用程序最酷的事情之一是它们中的许多应用程序的动画效果。您可以让视图飞过屏幕、淡入或淡出、淡出、旋转等等！这不仅看起来很酷，而且动画是一个很好的指标，表明用户应该注意正在发生的事情，例如更多信息可用。

Answer 3

- (void) showProgressView
{
if (progressViewBack.frame.origin.y == 460.0)
{
    [self.view bringSubviewToFront:progressViewBack];
    [progressViewBack setFrame:CGRectMake(6.0, 460, 308.0, 126.0)];
    [progressViewBack setBounds:CGRectMake(0, 0, 308, 126.0)];

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:1.0];
    [UIView setAnimationDelegate:self];
    [progressViewBack setFrame:CGRectMake(6.0, 334.0, 308.0, 126.0)];
    [UIView commitAnimations];
}
else if (progressViewBack.frame.origin.y == 334.0)
{   
    [progressViewBack setFrame:CGRectMake(6.0, 334.0, 308.0, 126.0)];       
    [progressViewBack setBounds:CGRectMake(0, 0, 308.0, 126.0)];

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:1.0];
    [UIView setAnimationDelegate:self];
    [progressViewBack setFrame:CGRectMake(6.0, 460.0, 308.0, 126.0)];
    [UIView commitAnimations];
}

}