在移除動畫之前, 首先得在 layer 上添加兩個動畫
示例代碼:
CABasicAnimation *animation = [CABasicAnimation animation];
animation.keyPath = @"transform.rotation";
animation.duration = 2.0;
animation.byValue = @(M_PI * 2);
animation.delegate = self;
animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;
[self.layer addAnimation:animation forKey:@"rotateAnimation"];
CABasicAnimation *animation2 = [CABasicAnimation animation];
animation2.keyPath = @"transform.scale";
animation2.duration = 2.0;
animation2.toValue = @2.0;
animation2.delegate = self;
animation2.removedOnCompletion = NO;
animation2.fillMode = kCAFillModeForwards;
[self.layer addAnimation:animation2 forKey:@"scale"];
添加兩個按鈕來控制動畫的 開始 和 移除 操作, 代碼(略)
點擊開始, 執(zhí)行上面的代碼
點擊結(jié)束:
1.移除制定動畫
[self.layer removeAnimationForKey:@"rotateAnimation"];
2.移除所有動畫
[self.layer removeAllAnimations];
查看動畫結(jié)束時的打印:
#pragma mark Animation delegate
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{
NSString *strAnimation = nil;
if ([self.layer animationForKey:@"rotateAnimation"] == anim) {
strAnimation = @"rotateAnimation";
}
if ([self.layer animationForKey:@"scale"] == anim){
strAnimation = @"scaleAnimation";
}
NSLog(@"%@ stop finish: %@",strAnimation, flag? @"yes": @"no");
}
特別注意:
1.以上方法取值時 使用的是 animationForKey 而不是 valueForKey
2.一定要把 animation 的 removedOnCompletion 設(shè)置成 NO, 否則取不到值
執(zhí)行以上代碼后, 發(fā)現(xiàn)手動結(jié)束動畫時, 圖像會還原到原來的位置.
解決方法:
在移除動畫操作后添加以下代碼
// 動畫移除后 保持在當前位置
self.layer.transform = self.layer.presentationLayer.transform;
執(zhí)行之后效果如下:
效果圖.gif
