iOS视图转换动画 [英] iOS view transform animation
本文介绍了iOS视图转换动画的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我可能错过了一些简单的东西,但试图用图像视图做一个简单的Ken Burns效果。
I'm probably missing something simple, but trying to do a simple "Ken Burns Effect" with an image view.
首先是代码:
[UIView animateWithDuration:20
delay:2
options:UIViewAnimationCurveLinear
animations:^{
CGAffineTransform move = CGAffineTransformMakeTranslation(40, 40);
CGAffineTransform zoom = CGAffineTransformMakeScale(1.2, 1.2);
CGAffineTransform transform = CGAffineTransformConcat(zoom, move);
self.imageView.transform = transform;
}
completion:^(BOOL finished){
NSLog(@"Done");
}];
我预计这将从正常比例的图像视图开始,并将其扩展到120%的大小超过20秒。实际发生的是它立即开始小于正常大小,然后扩展到正常大小。
I expected this to start with the image view at normal scale and expand it to 120% of the size over 20 seconds. What actually happens is that it starts out immediately smaller than normal size, then expands to normal size.
如果我使用比例值的倒数,它开始放大然后缩小到正常比例,这与我想要的效果相反。
If I use the reciprocal of the scale value, it starts out zoomed in and then zooms out to normal scale which is the opposite of the effect I want.
任何想法?
推荐答案
好的,这实际上有效并且做了我想要的。
Ok, this actually worked and does what I want.
CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
transformAnimation.duration = 20.0;
transformAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
transformAnimation.removedOnCompletion = NO;
transformAnimation.fillMode = kCAFillModeForwards;
CATransform3D xform = CATransform3DIdentity;
xform = CATransform3DScale(xform, 1.2, 1.2, 1.0);
xform = CATransform3DTranslate(xform, 60, -60, 0);
transformAnimation.toValue = [NSValue valueWithCATransform3D:xform];
[self.imageView.layer addAnimation:transformAnimation forKey:@"transformAnimation"];
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