我正在尝试为我的 UIView 垂直创建折叠动画。经过长时间的搜索，我找到了以下链接。使用 CATransform3D 透视的折纸过渡。从上面的链接中，我刚刚尝试了以下内容。它给了我确切的动画。我的 UIView 出现反向.. 我不知道我在哪里搞砸了.. 任何帮助将不胜感激..
-(IBAction)animate
{
CATransform3D transform = CATransform3DIdentity;
CALayer *topSleeve;
CALayer *middleSleeve;
CALayer *topShadow;
CALayer *middleShadow;
UIView *mainView;
CGFloat width = self.view.frame.size.width;
CGFloat height = self.view.frame.size.height;
CALayer *firstJointLayer;
CALayer *secondJointLayer;
CALayer *perspectiveLayer;
mainView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, height)];
mainView.backgroundColor = [UIColor clearColor];
[self.view addSubview:mainView];
UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGSize size = CGSizeMake(viewImage.size.width / 2, viewImage.size.height);
UIGraphicsBeginImageContextWithOptions(size, NO, 0.0);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [[UIColor blackColor] CGColor]);
CGContextFillRect(context, CGRectMake(0, 0, size.width, size.height));
UIImage *solidColorImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// The left half of the image
UIGraphicsBeginImageContextWithOptions(size, NO, 0.0);
[viewImage drawAtPoint:CGPointMake(0, 0) blendMode:kCGBlendModeNormal alpha:1.0];
UIImage *leftImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIGraphicsBeginImageContextWithOptions(size, NO, 0.0);
[viewImage drawAtPoint:CGPointMake(-size.width, 0) blendMode:kCGBlendModeNormal alpha:1.0];
[solidColorImage drawAtPoint:CGPointMake(0, 0) blendMode:kCGBlendModeMultiply alpha:0.1];
UIImage *rightImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
perspectiveLayer = [CALayer layer];
perspectiveLayer.frame = CGRectMake(0, 0, width/2, height);
[mainView.layer addSublayer:perspectiveLayer];
firstJointLayer = [CATransformLayer layer];
firstJointLayer.frame = mainView.bounds;
[perspectiveLayer addSublayer:firstJointLayer];
topSleeve = [CALayer layer];
topSleeve.frame = CGRectMake(0, 0, width/2, height);
topSleeve.anchorPoint = CGPointMake(0, 0.5);
topSleeve.backgroundColor = [UIColor colorWithPatternImage:leftImage].CGColor;
topSleeve.position = CGPointMake(0, height/2);
[firstJointLayer addSublayer:topSleeve];
topSleeve.masksToBounds = YES;
secondJointLayer = [CATransformLayer layer];
secondJointLayer.frame = mainView.bounds;
secondJointLayer.frame = CGRectMake(0, 0, width, height);
secondJointLayer.anchorPoint = CGPointMake(0, 0.5);
secondJointLayer.position = CGPointMake(width/2, height/2);
[firstJointLayer addSublayer:secondJointLayer];
middleSleeve = [CALayer layer];
middleSleeve.frame = CGRectMake(0, 0, width/2, height);
middleSleeve.anchorPoint = CGPointMake(0, 0.5);
middleSleeve.backgroundColor = [UIColor colorWithPatternImage:rightImage].CGColor;
middleSleeve.position = CGPointMake(0, height/2);
[secondJointLayer addSublayer:middleSleeve];
middleSleeve.masksToBounds = YES;
firstJointLayer.anchorPoint = CGPointMake(0, 0.5);
firstJointLayer.position = CGPointMake(0, height/2);
topShadow = [CALayer layer];
[topSleeve addSublayer:topShadow];
topShadow.frame = topSleeve.bounds;
topShadow.backgroundColor = [UIColor blackColor].CGColor;
topShadow.opacity = 0.5;
middleShadow = [CALayer layer];
[middleSleeve addSublayer:middleShadow];
middleShadow.frame = middleSleeve.bounds;
middleShadow.backgroundColor = [UIColor blackColor].CGColor;
middleShadow.opacity = 0.5;
transform.m34 = 1.0/(-700.0);
perspectiveLayer.sublayerTransform = transform;
CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.y"];
[animation setDuration:2];
[animation setAutoreverses:YES];
[animation setRepeatCount:INFINITY];
[animation setFromValue:[NSNumber numberWithDouble:90*M_PI/180]];
[animation setToValue:[NSNumber numberWithDouble:0]];
[firstJointLayer addAnimation:animation forKey:nil];
animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.y"];
[animation setDuration:2];
[animation setAutoreverses:YES];
[animation setRepeatCount:INFINITY];
[animation setFromValue:[NSNumber numberWithDouble:-180*M_PI/180]];
[animation setToValue:[NSNumber numberWithDouble:0]];
[secondJointLayer addAnimation:animation forKey:nil];
animation = [CABasicAnimation animationWithKeyPath:@"bounds.size.width"];
[animation setDuration:2];
[animation setAutoreverses:YES];
[animation setRepeatCount:INFINITY];
[animation setFromValue:[NSNumber numberWithDouble:perspectiveLayer.bounds.size.width]];
[animation setToValue:[NSNumber numberWithDouble:0]];
[perspectiveLayer addAnimation:animation forKey:nil];
animation = [CABasicAnimation animationWithKeyPath:@"position.x"];
[animation setDuration:2];
[animation setAutoreverses:YES];
[animation setRepeatCount:INFINITY];
[animation setFromValue:[NSNumber numberWithDouble:perspectiveLayer.position.x]];
[animation setToValue:[NSNumber numberWithDouble:0]];
[perspectiveLayer addAnimation:animation forKey:nil];
animation = [CABasicAnimation animationWithKeyPath:@"opacity"];
[animation setDuration:2];
[animation setAutoreverses:YES];
[animation setRepeatCount:INFINITY];
[animation setFromValue:[NSNumber numberWithDouble:0.5]];
[animation setToValue:[NSNumber numberWithDouble:0]];
[topShadow addAnimation:animation forKey:nil];
animation = [CABasicAnimation animationWithKeyPath:@"opacity"];
[animation setDuration:2];
[animation setAutoreverses:YES];
[animation setRepeatCount:INFINITY];
[animation setFromValue:[NSNumber numberWithDouble:0.5]];
[animation setToValue:[NSNumber numberWithDouble:0]];
[middleShadow addAnimation:animation forKey:nil];
}