Question

很抱歉，这是非常基本的，但我无法将AnimationOption从默认设置（EaseIn）设置为CurveLinear。这是我根据我在其他主题中阅读的内容尝试的内容：

    -(void)animationShadow;
{
    [UIView animateWithDuration:4
                        options:UIViewAnimationOptionCurveLinear
                     animations:^{
...

如果我取出选项位，一切正常。如果没有，它会崩溃。我确定我没有拨打正确的命令。

以下是整个块动画：

   -(void)animationShadow;
{
    [UIView animateWithDuration:4
                        options:UIViewAnimationOptionCurveLinear
                     animations:^{

        //UIViewAnimationOptionCurveLinear

        // animation 1
        [pageShadowView setTransform:CGAffineTransformMakeScale (3, 1)];
        [pageShadowView setFrame:CGRectMake(0-350, 0, CGRectGetWidth(pageShadowView.frame), CGRectGetHeight(pageShadowView.frame))];

        [UIView beginAnimations:@"pageCurlRightToLeftFinished" context:nil]; // Begin animation
        //[UIView setAnimationCurve:UIViewAnimationCurveLinear];
        [pageShadowView setFrame:CGRectMake(0-280, 0, CGRectGetWidth(pageShadowView.frame), CGRectGetHeight(pageShadowView.frame))];
        [UIView commitAnimations];



    } completion:^(BOOL finished){ ...

修改

好的，我现在更新了这个，但如果我做第二个动画，我仍然会崩溃。我收到警告：UIView可能无法响应+ animateWithDuration ...：

- （无效）animationShadow; {

[pageShadowView setTransform:CGAffineTransformMakeScale (3, 1)];
[pageShadowView setFrame:CGRectMake(0-350, 0, CGRectGetWidth(pageShadowView.frame), CGRectGetHeight(pageShadowView.frame))];


[UIView animateWithDuration:kPageCurlSpeed/4
                      delay:0
                    options:UIViewAnimationOptionCurveLinear
                 animations:^{
            [pageShadowView setFrame:CGRectMake(0-280, 0, CGRectGetWidth(pageShadowView.frame), CGRectGetHeight(pageShadowView.frame))];
                            }
                 completion:^(BOOL finished){


                     [UIView animateWithDuration:kPageCurlSpeed
                                           delay:0
                                         options:UIViewAnimationOptionCurveLinear
                                      animations:^{
                                          // animation 2

                                          [pageShadowView setTransform:CGAffineTransformMakeScale (0.1, 1)];
                                          [pageShadowView setFrame:CGRectMake((340-pageShadowView.frame.size.width), 0, CGRectGetWidth(pageShadowView.frame), CGRectGetHeight(pageShadowView.frame))];

                                      }
                      ]; // this is where I get the warning!!



                     }];

}

Answer 1

编辑：动画初始化代码应放在动画块之外。该块指定视图在动画结束时应达到的最终状态。

[pageShadowView setTransform:CGAffineTransformMakeScale(3, 1)];
[pageShadowView setFrame:CGRectMake(-350, ...)];

[UIView animateWithDuration:4 delay:0
                    options:UIViewAnimationOptionCurveLinear 
                 animations:^{
                              [pageShadowView setFrame:CGRectMake(-280, ...)];
                            }
                 completion:NULL];

如果要按顺序运行2个动画，则应将第2个动画放入completion块。

[UIView animateWithDuration:4 delay:0
                    options:UIViewAnimationOptionCurveLinear
                 animations:^{ /* animation 1 */ }
                 completion:^(BOOL finished) {
                               /* animation 2 */
                            }];

Answer 2

如果您发现所选曲线被忽略，请检查您是否使用了正确的开关组。

有一个名为 UIViewAnimationCurveLinear （对于较旧的方法）和 UIViewAnimationOptionCurveLinear （对于块方法）并且很容易将它们混合起来。有相应的等效对，以方便，缓和等。

这引起了我的注意，所以我想我确保其他人可以很容易地看到这些信息。

阻止动画：设置UIViewAnimationOptionCurveLinear

2 个答案: