UIScrollView 在视图中设置 contentoffset 将不起作用 [英] UIScrollView Setting contentoffset in viewwillappear not working

问题描述

我想知道是否可以在 viewwillappear 方法中为 uiscrollview 设置 contentoffset.

I was wondering if it is possible to set contentoffset for uiscrollview in viewwillappear method.

-(void) viewWillAppear:(BOOL)animated{

    [self.scrollView setContentOffset:CGPointMake(320, 0) animated:YES];
    NSLog(@"CALLED");    
}

我可以看到 viewwillappear 正在运行，但不幸的是它没有设置偏移量.

I can see viewwillappear is running but unfortunately it is not setting offset.

谢谢

推荐答案

您应该在尝试设置偏移量之前调用 [super viewWillAppear:animated];.

you should call [super viewWillAppear:animated]; before attempting to set the offset.

但是，您可能试图在视图生命周期中过早地设置偏移量.

However, it is possible you are trying to set the offset too early in the view lifecycle.

最好覆盖 -(void)viewDidLayoutSubviews;，并在那里设置偏移量.

it might be good to override -(void)viewDidLayoutSubviews;, and set the offset there.

因为到那时你的视图框架都应该被适当地设置.(记得在那里也调用 super)

as your view's frames should all be set appropriately by that time. (remember to call super there too)

这篇关于UIScrollView 在视图中设置 contentoffset 将不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！