我正在尝试在0.1秒的动画块中将NSImageView缩放/调整为其原始大小的120%,然后在动画块完成后返回其原始大小。什么是最快和最少cpu密集的方式?
我基本上在寻找与iOS中使用的以下代码相当的代码,但我需要它用于Mac应用程序:
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration: 0.1];
image.transform = CGAffineTransformScale(image.transform, newSize, newSize);
[UIView setAnimationDelegate:self];
[UIView commitAnimations];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration: 0.1];
image.transform = CGAffineTransformScale(image.transform, originalSize, originalSize);
[UIView setAnimationDelegate:self];
[UIView commitAnimations];
感谢您的帮助。
答案 0 :(得分:3)
可能会占用一点CPU,具体取决于图像是否在NSImageView
内缩放,但您可以使用NSAnimationContext
完成相同的操作:
NSRect oldFrame = self.imageView.frame;
NSRect newFrame = NSMakeRect(self.imageView.frame.origin.x,
self.imageView.frame.origin.y,
self.imageView.frame.size.width*1.2f,
self.imageView.frame.size.height*1.2f);
[NSAnimationContext runAnimationGroup:^(NSAnimationContext *context){
// Animating to the new frame...
[context setDuration:0.1f];
[[self.imageView animator] setFrame:newFrame];
} completionHandler:^{
[NSAnimationContext runAnimationGroup:^(NSAnimationContext *context){
// Back to the old frame...
[context setDuration:0.1f];
[[self.imageView animator] setFrame:oldFrame];
} completionHandler:nil];
}];
但这种方式可以在OS X 10.7及更高版本上运行。
这也可以通过看起来有点像UIView
代码的方式完成,并且可以使用10.5及更高版本:
- (void)whatever {
NSRect oldFrame = self.imageView.frame;
NSRect newFrame = NSMakeRect(self.imageView.frame.origin.x,
self.imageView.frame.origin.y,
self.imageView.frame.size.width*1.2f,
self.imageView.frame.size.height*1.2f);
[self performSelector:@selector(animateImageViewToFrame:)
withObject:[NSValue valueWithRect:newFrame]
afterDelay:0];
[self performSelector:@selector(animateImageViewToFrame:)
withObject:[NSValue valueWithRect:oldFrame]
afterDelay:0.1f];
}
- (void)animateImageViewToFrame:(NSValue*)frameValue {
[NSAnimationContext beginGrouping];
[[NSAnimationContext currentContext] setDuration:0.1f];
// Get smaller
[[self.imageView animator] setFrame:[frameValue rectValue]];
[NSAnimationContext endGrouping];
}
当然,如果有效的话会很棒:
[NSAnimationContext beginGrouping];
[[NSAnimationContext currentContext] setDuration:0.1f];
[[self.imageView animator] setFrame:newFrame];
[NSAnimationContext endGrouping];
[NSAnimationContext beginGrouping];
[[NSAnimationContext currentContext] setDuration:0.1f];
[[self.imageView animator] setFrame:oldFrame];
[NSAnimationContext endGrouping];
甚至更好:
[NSAnimationContext beginGrouping];
[[NSAnimationContext currentContext] setDuration:0.1f];
[[self.imageView animator] setFrame:newFrame];
[[self.imageView animator] setFrame:oldFrame];
[NSAnimationContext endGrouping];
但是,由于我无法弄清楚的原因,这些都没有做任何事情。
有关详细信息,请参阅NSAnimationContext Class Reference。