Question

我有一个UIScrollView，我添加了几个子视图（在loadView中完成）（参见代码）：

// Add the views to the Scroll View
[scrollView addSubview:label];
[scrollView addSubview:careerDescriptionWebView];

self.view = scrollView;

然后我想要计算添加的子视图的高度（在viewWillAppear:中完成以设置UIScrollView的高度（参见此代码）：

// Change the height of the Scroll View dynamically to match the content
float hgt = 0; 

for (UIView *view in scrollView.subviews) {
    hgt += view.frame.size.height;
    NSLog(@"View: %@, height: %f", [[view class] description], view.frame.size.height);
}    

[scrollView setContentSize:CGSizeMake(scrollView.frame.size.width,hgt)];

所以稍后当我检查控制台的输出时，我看到了：

2011-06-23 13:34:48.344 Acando[90355:207] View: UILabel, height: 21.000000
2011-06-23 13:34:48.345 Acando[90355:207] View: UIWebView, height: 1017.000000
2011-06-23 13:34:48.346 Acando[90355:207] View: UIImageView, height: 7.000000
2011-06-23 13:34:48.347 Acando[90355:207] View: UIImageView, height: 145.000000

这不会立即显示，首先它只显示正确的UILabel和UIWebView，它似乎在加载viewcontroller几次后随机出现。

Answer 1

这是因为scrollview在这个视图中还有2个东西，一个是水平滚动条，第二个是垂直滚动条，当你向上和向下滚动时左右自动显示

iOS超级奇怪的问题，添加了子视图而没有添加它们

1 个答案: