自定义webview控件和navigationController控件介绍

1. 俩控件
QMWebView QMNavigationController
bangchen

2. QMWebView

3. UIWebView
UIWebViewScrollView
UIImageView * x
UIWebBrowserView

4. contentInset.top
scrollView.contentSize
webView.frame
contentInset.right
contentInset.left
contentInset.bottom

5. 接口
@property (nonatomic, retain) UIView *footerView;
@property (nonatomic, retain) UIView *headerView;
- (void) headerViewHeightChange:(int)height animated:(BOOL)animated;
- (void) footerViewHeightChange:(int)height;
- (void) refresh;

6. 内部工作

7. 给webview设header/footer时计算contentInset

8. header, footer高度改变的位置调整/动画

9. webview 动/缩放时header/footer的位置

10. contentSize改变时footer的位置

11. 困难

12. iOS4 webview加载完成，自动跳到contentOffsetY=0
loading finish

13. 解决：加标志
- (void)loadRequest:(NSURLRequest *)request
{
! _startLoad = YES;
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
if (_startLoad && scrollView.contentOffset.y == 0) {
_startLoad = NO;
scrollView.contentOffset = CGPointMake(0, -scrollView.contentInset.top);
return ;
}
}

14. 上一个内容的残影
[webview stringByEvaluatingJavaScriptFromString:
@"document.open();document.close()"];
or
new webview

15. 莫名黑色块
opaque = NO;

16. QMNavigationController

17. 问题：自定义navigationItem.leftBarButtonItem无动画

18. 已有信息
- (UIViewController *)popViewControllerAnimated:(BOOL)animated
- (void)pushViewController:(UIViewController *)viewController
animated:(BOOL)animated
@property(nonatomic,copy) NSArray *viewControllers;
// The current view controller stack.

19. 在push与pop 个方法执行前加入动画逻辑
if (animated) {
! ! UIViewController *popController = [self.viewControllers lastObject];
! ! UIViewController *pushController =
[self.viewControllers objectAtIndex:self.viewControllers.count - 2];
! ! [popController viewDisappearFromLeft];
! ! [pushController viewAppearFromLeft];
! }
! return [super popViewControllerAnimated:animated];

20. END