我已经成功地为图层的位置和变换(旋转)设置了动画。
现在,我需要为锚点设置动画,但所有尝试都失败了!即使我这样做:
2012... App[6437:403] layer: 1, KeyPath: anchorPoint, fromValue: NSPoint: {1.05, 0.5}, toValue: NSPoint: {1.05, 0.5}, Duration: 2.5
这是在为图层设置动画之前卡住的 NSLog。我得到的结果是图层在 X 轴上向左移动太远,然后回来......并重复(因为自动反转已打开)。
关于图层层次结构的注意事项:SuperLayer 有三个子图层,我将在其上应用动画。
为什么?锚点应该如何动画?
我的代码:
NSArray* subKeyPath = [keyPaths objectAtIndex:tag];
NSArray* subToValue = [toValues objectAtIndex:tag];
NSArray* subDuration = [durations objectAtIndex:tag];
NSEnumerator* keyPathsEnum = [subKeyPath objectEnumerator];
NSEnumerator* toValuesEnum = [subToValue objectEnumerator];
NSEnumerator* durationsEnum = [subDuration objectEnumerator];
NSString* keyPath;
NSNumber* toValue;
NSNumber* duration;
while ((keyPath = [keyPathsEnum nextObject]) && (toValue = [toValuesEnum nextObject]) && (duration = [durationsEnum nextObject])) {
CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:keyPath];
id offsetToValue;
if ([keyPath hasPrefix:@"position"]) {
//I removed the position animation, since animating the anchorPoint should suffice
} else if ([keyPath hasPrefix:@"anchorPoint"]) {
//This was when I used anchorPoint.x float value = [[subLayer valueForKeyPath:keyPath] floatValue] - ([toValue floatValue]/[[subLayer contents] size].width);
offsetToValue = [NSNumber valueWithPoint:CGPointMake(1.05, 0.5)];
keyPath = [keyPath substringToIndex:[keyPath length]-2];
} else {
offsetToValue = toValue;
}
...
animation.toValue = offsetToValue;
animation.duration = [duration floatValue];
animation.fillMode = kCAFillModeForwards;
animation.repeatCount = INFINITY;
animation.autoreverses = YES;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[subLayer addAnimation:animation forKey:keyPath];
//update the model
}
我尝试为“anchorPoint.x”keyPath 设置动画,结果相同:(
最后一点,我正在编写一个可可应用程序,但是在可可和可可触摸上设置 X 值的动画应该完全相同。