Question

我制作了UIScrollView，其宽度随触摸而变化。当前视图控制器切换到下一个时，我想保存UIScrollView的宽度。再次显示视图控制器时，应恢复UIScrollView的宽度。

//TouZiViewController is the current view controller
@implementation TouZiViewController
...
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if([[segue identifier] isEqualToString:@"toTouZi2"])
    {   //TouZi2ViewController is the destination view controller
        TouZi2ViewController *viewController2=[segue destinationViewController];

        //huatiaoRect is CGRect,fullHuaTiao is the outlet of UIScrollView
        viewController2.huatiaoRect=self.fullHuaTiao.frame;

    }
}
@end


@implementation TouZi2ViewController
...
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if([[segue identifier] isEqualToString:@"toTouZi"])
    {
        TouZiViewController *viewController=[segue destinationViewController];
        [viewController loadView];

        viewController.fullHuaTiao.frame=self.huatiaoRect;

    }

}
@end

问题在于，当我从第二个视图控制器返回时，UIScrollView的位置比以前高很多。为什么是这样？的更新现在我发现问题是因为自动化。我在故事板中更改自动调整，然后它运行良好。

Answer 1

我认为问题可能是在设置帧之前调用loadview方法。如果没有记录Frame值并找到值更改的位置

更改为此并尝试

    viewController.fullHuaTiao.frame=self.huatiaoRect;
    [viewController loadView];

UIScrollView的奇怪行为

1 个答案: