方案一：self.navigationController.hidesBarsOnSwipe = YES;
方案二：http://codecloud.net/15369.html
========.h
@interface NavBarViewController : UIViewController
- (void)followSwipeScrollView:(UIView *)scrollView;
@end
========.m
#define NavBarFrame self.navigationController.navigationBar.frame@interface NavBarViewController ()@property (weak, nonatomic) UIView *scrollView;
@property (strong, nonatomic) UIPanGestureRecognizer *panGesture;
@property (strong, nonatomic) UIView *overLay;
@property (assign, nonatomic) BOOL isHidden;
@end
@implementation NavBarViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//设置navigationBar跟随滚动的视图（可以是scrollView或者tableview，webview。）
-(void)followSwipeScrollView:(UIView *)scrollView
{
self.scrollView = scrollView;
self.panGesture = [[UIPanGestureRecognizer alloc] init];
self.panGesture.delegate = self;
self.panGesture.minimumNumberOfTouches = 1;
[self.panGesture addTarget:self action:@selector(handlePanGesture:)];
[self.scrollView addGestureRecognizer:self.panGesture];
self.overLay = [[UIView alloc] initWithFrame:self.navigationController.navigationBar.bounds];
self.overLay.alpha = 0;
self.overLay.backgroundColor = self.navigationController.navigationBar.barTintColor;
[self.navigationController.navigationBar addSubview:self.overLay];
[self.navigationController.navigationBar bringSubviewToFront:self.overLay];
}
#pragma mark - 兼容其他手势
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return YES;
}
#pragma mark - 手势监听方法
-(void)handlePanGesture:(UIPanGestureRecognizer *)panGesture
{
CGPoint translation = [panGesture translationInView:[self.scrollView superview]];
//显示
if (translation.y >= 5) {
if (self.isHidden) {
self.overLay.alpha = 0;
CGRect navBarFrame = NavBarFrame;
CGRect scrollViewFrame = self.scrollView.frame;
navBarFrame.origin.y = 20;
scrollViewFrame.origin.y += 44;
scrollViewFrame.size.height -= 44;
[UIView animateWithDuration:0.5 animations:^{
NavBarFrame = navBarFrame;
self.scrollView.frame = scrollViewFrame;
if ([self.scrollView isKindOfClass:[UIScrollView class]]) {
UIScrollView *scrollView = (UIScrollView *)self.scrollView;
scrollView.contentOffset = CGPointMake(scrollView.contentOffset.x, scrollView.contentOffset.y + 44);
}else if ([self.scrollView isKindOfClass:[UIWebView class]]){
UIWebView *webView=(UIWebView *)self.scrollView;
webView.scrollView.contentOffset = CGPointMake(webView.scrollView.contentOffset.x, webView.scrollView.contentOffset.y + 44);
}
}];
self.isHidden = NO;
}
}
//隐藏
if (translation.y <= -20) {
if (!self.isHidden) {
CGRect frame = NavBarFrame;
CGRect scrollViewFrame = self.scrollView.frame;
frame.origin.y = -24;
scrollViewFrame.origin.y -= 44;
scrollViewFrame.size.height += 44;
[UIView animateWithDuration:0.2 animations:^{
NavBarFrame = frame;
self.scrollView.frame = scrollViewFrame;
if ([self.scrollView isKindOfClass:[UIScrollView class]]) {
UIScrollView *scrollView = (UIScrollView *)self.scrollView;
//contentOffset:scrollview当前显示区域顶点相对于frame顶点的偏移量
scrollView.contentOffset = CGPointMake(scrollView.contentOffset.x, scrollView.contentOffset.y-44);
}else if ([self.scrollView isKindOfClass:[UIWebView class]]){
UIWebView *webView=(UIWebView *)self.scrollView;
webView.scrollView.contentOffset = CGPointMake(webView.scrollView.contentOffset.x, webView.scrollView.contentOffset.y-44);
}
} completion:^(BOOL finished) {
self.overLay.alpha = 1;
}];
self.isHidden = YES;
}
}
}
-(void)viewDidAppear:(BOOL)animated{
[self.navigationController.navigationBar bringSubviewToFront:self.overLay];
}
@end
