我正在尝试将动画添加到UIView中。动画的目标是“动画”出现在屏幕上的视图(而不是仅仅出现在那里)。
动画是所有尺寸缩放:从5%开始,上升到120%,然后很快回到常规比例的100%。
我的问题是在动画开始之前,全尺寸UIView会很快出现。
以下是代码:
UIView * myView = [[UIView alloc] initWithFrame:someFrame];
[self.view addSubview:myView];
[self initialAnimationFor:myView];
-(void) initialAnimationFor:(UIView*)pView {
const CFTimeInterval firstDuration = 0.75f;
const CFTimeInterval secondDuration = 0.025f;
const float initialValue = 0.05f;
const float middleValue = 1.20f;
CABasicAnimation * firstAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
firstAnimation.duration = firstDuration;
firstAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
firstAnimation.fromValue = [NSNumber numberWithFloat:initialValue];
firstAnimation.toValue = [NSNumber numberWithFloat:middleValue];
CABasicAnimation * secondAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
secondAnimation.duration = secondDuration;
secondAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
secondAnimation.fromValue = [NSNumber numberWithFloat:middleValue];
secondAnimation.toValue = [NSNumber numberWithFloat:1.0f];
CAAnimationGroup *animationGroup = [CAAnimationGroup new];
animationGroup.duration = firstDuration + secondDuration;
animationGroup.animations = @[firstAnimation, secondAnimation];
[pView.layer addAnimation:animationGroup forKey:nil];
}
有什么想法吗?谢谢!
答案 0 :(得分:1)
我会使用不同的技术并使用链式UIView
块动画,如下所示:
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(40, 40, 200, 200)];
myView.backgroundColor = [UIColor redColor];
[self initialAnimationFor:myView];
}
- (void)initialAnimationFor:(UIView*)pView {
pView.transform = CGAffineTransformMakeScale(0.05f, 0.05f);
if (pView.superview == nil) {
[self.view addSubview:pView];
}
[UIView
animateWithDuration:0.75f
animations:^{
pView.transform = CGAffineTransformMakeScale(1.20f, 1.20f);
}
completion:^(BOOL finished) {
[UIView
animateWithDuration:0.25f // <-- Your old value of 0.025f makes the animation VERY quick
animations:^{
pView.transform = CGAffineTransformIdentity;
}
];
}
];
}
通过此设置,您可以“增长到略大于100%,然后'稳定'到100%”效果。
这是一个可行的解决方案吗?