在UIImageView的＆下来动画的UIImage（就像是盘旋）循环(Animate UIImag

你好，我有我想向上和向下移动（最多10个像素，向下10个像素），使我的形象似乎徘徊的图像。我怎样才能做到这一点用简单的动画，非常感谢！

Answer 1:

你可以使用的Core Animation动画视图层的位置。如果配置动画要additive你不会费心计算新的绝对位置，只是变化（相对位置）。

CABasicAnimation *hover = [CABasicAnimation animationWithKeyPath:@"position"];
hover.additive = YES; // fromValue and toValue will be relative instead of absolute values
hover.fromValue = [NSValue valueWithCGPoint:CGPointZero];
hover.toValue = [NSValue valueWithCGPoint:CGPointMake(0.0, -10.0)]; // y increases downwards on iOS
hover.autoreverses = YES; // Animate back to normal afterwards
hover.duration = 0.2; // The duration for one part of the animation (0.2 up and 0.2 down)
hover.repeatCount = INFINITY; // The number of times the animation should repeat
[myView.layer addAnimation:hover forKey:@"myHoverAnimation"];

由于这是使用的Core Animation，您将需要QuartzCore.framework并添加#import <QuartzCore/QuartzCore.h>到你的代码。

Answer 2:

为SWIFT 3和SWIFT 4：

let hover = CABasicAnimation(keyPath: "position")

hover.isAdditive = true
hover.fromValue = NSValue(cgPoint: CGPoint.zero)
hover.toValue = NSValue(cgPoint: CGPoint(x: 0.0, y: 100.0))
hover.autoreverses = true
hover.duration = 2
hover.repeatCount = Float.infinity

myView.layer.add(hover, forKey: "myHoverAnimation")

Answer 3:

试试这个：

CGRect frm_up = imageView.frame;
frm_up.origin.y -= 10;

[UIView animateWithDuration:0.5
    delay:0.0
    options:UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeats
    animations:^{
        imageView.frame = frm_up;
    }
    completion:NULL
];