如何动态设置UIScrollView的内容大小

问题描述

我对 UIScrollview 提出疑问。

故事是我有 UIView 命名为ChartsView，我自己通过覆盖方法 drawRect（）重新绘制它。绘图的内容是动态生成的。所以直到运行时我才知道它的大小。问题是如何/在哪里可以动态设置其超级视图（scrollView）内容大小？有任何想法吗？

The story is I have a UIView named ChartsView which I re-draw it myself by override method drawRect(). The content of drawing was generated dynamically. So I do not know its size until runtime. The question is how/where can I set its super view's (scrollView) content size dynamically?Any idea about that?

    - (void)viewDidLoad
    {
        [super viewDidLoad];

// not this way. it's fixed size.....
        ChartsView *chartsView = [[ChartsView alloc]initWithFrame:CGRectMake(0, 0, 320, 800)];

        self.scrollView.contentSize = chartsView.frame.size;

        [self.scrollView addSubview:chartsView];

    }

推荐答案

还有一个简单方法

- (void)viewDidLoad
{
    float sizeOfContent = 0;
    UIView *lLast = [scrollView.subviews lastObject];
    NSInteger wd = lLast.frame.origin.y;
    NSInteger ht = lLast.frame.size.height;

    sizeOfContent = wd+ht;

    scrollView.contentSize = CGSizeMake(scrollView.frame.size.width, sizeOfContent);
}

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