Objective c iOS视图变换动画
我可能错过了一些简单的东西,但尝试用一个图像视图来做一个简单的“肯·伯恩斯效应” 首先是守则:Objective c iOS视图变换动画,objective-c,ios,core-animation,cgaffinetransformscale,Objective C,Ios,Core Animation,Cgaffinetransformscale,我可能错过了一些简单的东西,但尝试用一个图像视图来做一个简单的“肯·伯恩斯效应” 首先是守则: [UIView animateWithDuration:20 delay:2 options:UIViewAnimationCurveLinear animations:^{ CGAffineTransform move = CGAffineTra
[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");
}];
我希望从正常比例的图像视图开始,并在20秒内将其扩展到大小的120%。实际情况是,它开始时比正常尺寸小,然后扩展到正常尺寸
如果我使用比例值的倒数,它开始缩小,然后缩小到正常比例,这与我想要的效果相反
有什么想法吗?您尝试过从imageView的当前转换开始吗
[UIView animateWithDuration:20
delay:2
options:UIViewAnimationCurveLinear
animations:^{
CGAffineTransform trans = self.imageView.transform;
CGAffineTransformTranslate(trans, 40, 40);
CGAffineTransformScale(trans, 1.2, 1.2);
self.imageView.transform = trans;
}
completion:^(BOOL finished){
NSLog(@"Done");
}];
好的,这确实起作用了,而且符合我的要求
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"];
这听起来像是视图被其父视图重新布局以响应变换中的更改,一旦在动画块中设置了变换,就会将其缩小到变换的最终结果。关键是,第一次尝试直接对视图进行更改,而第二次尝试对层进行更改。我尝试过将加法CG函数用于标识转换,但也没有成功。有些微妙的事情发生了,只是还没弄明白。在图层上使用CATTransform3D(从身份转换开始)会导致相同的问题。请接受您自己的答案;)