重复淡入/淡出效果以在三个视图之间切换

Question

我创建了一个包含三个子视图的视图。

我想淡出/淡出三个子视图并无限期地重复这个效果。

我试着像：

+ (void)fadeIn:(UIView *)view withDuration:(float)duration
{
    [UIView animateWithDuration:duration animations:^{
        view.alpha = 1.0;
    }];
}

+ (void)fadeOut:(UIView *)view withDuration:(float)duration
{
    [UIView animateWithDuration:duration animations:^{
        view.alpha = 0.0;
    }];
}

[UIView animateWithDuration:5.0
                      delay:2.0
                    options:UIViewAnimationCurveLinear | UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat
                 animations:^
{
    [Utilities fadeOut:headSubtitle_1 withDuration:1];
    [Utilities fadeIn:headSubtitle_2 withDuration:1];
    [Utilities fadeOut:headSubtitle_2 withDuration:1];
    [Utilities fadeIn:headSubtitle_3 withDuration:1];
    [Utilities fadeOut:headSubtitle_3 withDuration:1];
    [Utilities fadeIn:headSubtitle_1 withDuration:1];
}
                 completion:^(BOOL finished)
{}];

但它效果不好。

我将获得的效果是：

1. 显示headSubtitle_1 2秒
2. FadeOut headSubtitle_1 in 1秒
3. 1秒内淡化headSubstitle_2
4. 显示headSubstitle_2 2秒
5. FadeOut headSubtitle_2 in 1 second
6. 1秒内淡化headSubstitle_3
7. 显示headSubstitle_3 2秒
8. FadeOut headSubtitle_3 in 1 second
9. 1秒内淡化headSubtitle_1
10. 重复1。

非常感谢！

修改

最后，我尝试这样的事情：

+ (void)runAnimationSubtitleOrdersWithSub1:(UITextView *)headSubtitle_1 andSub2:(UITextView *)headSubtitle_2 andSub3:(UITextView *)headSubtitle_3
{
    [UIView animateWithDuration:1.0 delay:1.0 options:UIViewAnimationOptionCurveEaseOut animations:^{
        headSubtitle_1.alpha = 0;
    } completion:^(BOOL finished) {
        if (finished)
        {
            [UIView animateWithDuration:1.0 delay:1.0 options:UIViewAnimationOptionCurveEaseOut animations:^{
                headSubtitle_2.alpha = 1;
            } completion:^(BOOL finished) {
                if (finished)
                {
                    [UIView animateWithDuration:1.0 delay:1.0 options:UIViewAnimationOptionCurveEaseOut animations:^{
                        headSubtitle_2.alpha = 0;
                    } completion:^(BOOL finished) {
                        if (finished)
                        {
                            [UIView animateWithDuration:1.0 delay:1.0 options:UIViewAnimationOptionCurveEaseOut animations:^{
                                headSubtitle_3.alpha = 1;
                            } completion:^(BOOL finished) {
                                if (finished)
                                {
                                    [UIView animateWithDuration:1.0 delay:1.0 options:UIViewAnimationOptionCurveEaseOut animations:^{
                                        headSubtitle_3.alpha = 0;
                                    } completion:^(BOOL finished) {
                                        if (finished)
                                        {
                                            [UIView animateWithDuration:1.0 delay:1.0 options:UIViewAnimationOptionCurveEaseOut animations:^{
                                                headSubtitle_1.alpha = 1;
                                            } completion:^(BOOL finished) {
                                                [FormBuilder runAnimationSubtitleOrdersWithSub1:headSubtitle_1 andSub2:headSubtitle_2 andSub3:headSubtitle_3];
                                            }];
                                        }
                                    }];
                                }
                            }];
                        }
                    }];
                }
            }];
        }
    }];
}

真的很难看！如果某个团体知道更好的方法。

Answer 1

也许你可以用这样的东西玩几个动画（但是，它并不漂亮）：

_imageView.alpha = 0.0f;
_imageView2.alpha = 0.0f;
_imageView3.alpha = 0.0f;


[UIView animateWithDuration:1
                      delay:0
                    options:UIViewAnimationCurveLinear | UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat
                 animations:^{

                     _imageView.alpha = 1.0f;

                     [UIView animateWithDuration:1
                                           delay:1
                                         options:UIViewAnimationCurveLinear | UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat
                                      animations:^{

                                          _imageView2.alpha = 1.0f;

                                      } completion:^(BOOL finished) {

                                          _imageView2.alpha = 0.0f;

                                      }
                      ];


                 } completion:^(BOOL finished) {

                     _imageView.alpha = 0.0f;


                 }
 ];

Answer 2

看看[UIView beginAnimations:(NSString *) context:(void *)]。