Ios 从viewDidLoad调用该方法时,Cabasicanization不起作用
我在视图中添加了一个imageView,该视图以modalViewController的形式显示,样式为水平翻转。 我添加了以下用于设置imageView动画的代码Ios 从viewDidLoad调用该方法时,Cabasicanization不起作用,ios,cabasicanimation,performselector,Ios,Cabasicanimation,Performselector,我在视图中添加了一个imageView,该视图以modalViewController的形式显示,样式为水平翻转。 我添加了以下用于设置imageView动画的代码 - (void)animateTheImageview:(UIImageView*) imageViewToAnimate{ CABasicAnimation *fadeAnimation; fadeAnimation = [CABasicAnimation animationWithKeyPath:@"o
- (void)animateTheImageview:(UIImageView*) imageViewToAnimate{
CABasicAnimation *fadeAnimation;
fadeAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
fadeAnimation.duration = 1.5;
fadeAnimation.repeatCount = INFINITY;
fadeAnimation.autoreverses = NO;
fadeAnimation.fromValue = [NSNumber numberWithFloat:1.0];
fadeAnimation.toValue = [NSNumber numberWithFloat:0.5];
fadeAnimation.removedOnCompletion = YES;
fadeAnimation.fillMode = kCAFillModeForwards;
[imageViewToAnimate.layer addAnimation:fadeAnimation forKey:@"animateOpacity"];
}
- (void)switchOnorOff
{
if (onOffSwitch.on)
{
self.lightImage.image = [UIImage imageNamed:@"CFLGlow.jpg"];
[self animateTheImageview:self.lightImage];
}
else
{
self.lightImage.image = [UIImage imageNamed:@"CFL-BULB.jpg"];
[self.lightImage.layer removeAllAnimations];
}
}
我从viewDidLoad
调用这个方法:
- (void)viewDidLoad
{
[self switchOnorOff];
}
我的问题是上面的代码没有设置imageView的动画
- (void)animateTheImageview:(UIImageView*) imageViewToAnimate{
CABasicAnimation *fadeAnimation;
fadeAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
fadeAnimation.duration = 1.5;
fadeAnimation.repeatCount = INFINITY;
fadeAnimation.autoreverses = NO;
fadeAnimation.fromValue = [NSNumber numberWithFloat:1.0];
fadeAnimation.toValue = [NSNumber numberWithFloat:0.5];
fadeAnimation.removedOnCompletion = YES;
fadeAnimation.fillMode = kCAFillModeForwards;
[imageViewToAnimate.layer addAnimation:fadeAnimation forKey:@"animateOpacity"];
}
- (void)switchOnorOff
{
if (onOffSwitch.on)
{
self.lightImage.image = [UIImage imageNamed:@"CFLGlow.jpg"];
[self animateTheImageview:self.lightImage];
}
else
{
self.lightImage.image = [UIImage imageNamed:@"CFL-BULB.jpg"];
[self.lightImage.layer removeAllAnimations];
}
}
但当我尝试以下代码时,它是有效的:
[self performSelectorOnMainThread:@selector(animateTheImageview:) withObject:self.lightImage waitUntilDone:YES];
我的问题是为什么会发生这个问题?
有什么区别吗?
[self-performSelectorOnMainThread:@selector(animateTheImageview:)with-object:self.lightImage waituntldone:YES]代码>
及
[自动画图像视图:self.lightImage]代码>您不应该在viewDidLoad中执行任何动画,也不应该在其中调用[super viewDidLoad],因为您只是在覆盖它。
尝试在ViewWillDisplay或ViewDidDisplay上显示它
然后,根据,performSelectorOnMainThread:withObject:waitUntilDone:
在主线程的运行循环中将消息排队
因此,队列中的其他消息可能会在执行动画之前首先完成
希望这有帮助您不应该在viewDidLoad中执行任何动画,也可以在其中调用[super viewDidLoad],因为您只是在覆盖它。
尝试在ViewWillDisplay或ViewDidDisplay上显示它
然后,根据,performSelectorOnMainThread:withObject:waitUntilDone:
在主线程的运行循环中将消息排队
因此,队列中的其他消息可能会在执行动画之前首先完成
希望这有帮助谢谢,在pageViewController内的viewDidLoad中放置动画时遇到了相同的问题。谢谢,在pageViewController内的viewDidLoad中放置动画时遇到了相同的问题。