[动画学习]CATransition

CATransition 是CAAnimation的子类，用了控制过渡动画。有一个type和subtype来标识变换效果。

CATransition1

CATransition2

-(void)Animation{
    self.colorlayer = [CALayer layer];
    self.colorlayer.frame = CGRectMake(50.0f, 50.0f, 100.0f, 100.0f);
    self.colorlayer.backgroundColor = [UIColor blueColor].CGColor;
    //add a custom action
    CATransition *transition = [CATransition animation];
    //样式
    transition.type = kCATransitionPush;
    //方向
    transition.subtype = kCATransitionFromTop;
    self.colorlayer.actions = @{@"backgroundColor": transition};
    
    
    //add it to our view
    
    [self.layerView.layer addSublayer:self.colorlayer];
}
- (IBAction)actionBtnclick:(id)sender {
    
    [CATransaction begin];
    //调整动画时长 隐式动画默认时长0.25
    [CATransaction setAnimationDuration:0.5];
    [CATransaction setCompletionBlock:^{
        NSLog(@"动画结束回掉");
    }];
    CGFloat red = arc4random() / (CGFloat)INT_MAX;
    CGFloat green = arc4random() / (CGFloat)INT_MAX;
    CGFloat blue = arc4random() / (CGFloat)INT_MAX;
    self.colorlayer.backgroundColor = [UIColor colorWithRed:red green:green blue:blue alpha:1.0].CGColor;
    [CATransaction commit];
}

隐式动画禁用

实际应用：[UICollectionView reloadData] 会出现view/layer闪烁问题。是由于layer的隐式动画。

我在设置hidden属性时出发了闪烁,故调用+ (void)setDisableActions:(BOOL)flag取消隐式动画

 [CATransaction begin];
    [CATransaction setDisableActions:YES];
//layer 属性
    for ( CAGradientLayer *gl in _layeArr) {
        if (sender.tag == [_layeArr indexOfObject:gl]+666) {
             gl.hidden = NO;
        }else{
            gl.hidden = YES;
        }
    }
    [CATransaction commit];