导航栏上拉渐变，，头视图下拉放大
/// 状态栏变色 info.plist 添加 View controller-based status bar appearance 为 NO
- (UIStatusBarStyle)preferredStatusBarStyle{
if (self.changeColor == YES) {
return UIStatusBarStyleLightContent;
}else{
return UIStatusBarStyleDefault;
}
}
1.
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[weakSelf.navigationController setNavigationBarHidden:YES animated:YES];
}
-(void)viewWillDisappear:(BOOL)animated{
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
2.
- (void)viewDidLoad {
[super viewDidLoad];
// 导航条
self.headView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, Width, nanH)];
self.headView.alpha = 0;
self.headView.backgroundColor = [UIColor whiteColor];
UIView *line = [[UIView alloc] initWithFrame:CGRectMake(0, nanH - 0.7, Width, 0.7)];
[self.headView addSubview:line];
line.backgroundColor = [UIColor lightGrayColor];
[self.view addSubview:self.headView];
///
self.backImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"返回-7"]];
self.backImage.frame = CGRectMake(18, statusH+12, 20, 20);
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(backAction)];
self.backImage.userInteractionEnabled = YES;
[self.backImage addGestureRecognizer:tap];
[self.view addSubview:self.backImage];
///
self.backButton = [UIButton buttonWithType:UIButtonTypeSystem];
[self.backButton setTitle:NSLocalizedString(@"Back", nil) forState:UIControlStateNormal];
[self.view addSubview:self.backButton];
self.backButton.tintColor = [UIColor whiteColor];
self.backButton.frame = CGRectMake(35, statusH+12, 40, 20);
[self.backButton addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside];
//
self.titlLabel = [[UILabel alloc] initWithFrame:CGRectMake(Width/2-100, statusH+12, 200, 20)];
self.titlLabel.text = NSLocalizedString(@"Personal circle", nil);
[self.view addSubview:self.titlLabel];
self.titlLabel.textAlignment = NSTextAlignmentCenter;
self.titlLabel.textColor = [UIColor whiteColor];
刷新状态栏的颜色
self.changeColor = YES;
[self setNeedsStatusBarAppearanceUpdate];
/// 创建tableview 添加头视图
}
3.
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
CGFloat scroll=scrollView.contentOffset.y;
CGFloat imageH = 209;///209头视图高度
/// 导航栏View渐变
if (scroll > 0) {
self.headView.alpha = 1 * (scroll / (imageH-64));
}else{
self.headView.alpha = 0;
}
/// 导航栏返回按钮标题变色
if (scroll>=(imageH-64-49)) {
self.backImage.image = [UIImage imageNamed:@"返回-4"];
self.backButton.tintColor = [UIColor blackColor];
self.titlLabel.textColor = [UIColor blackColor];
刷新状态栏的颜色
self.changeColor = NO;
[self setNeedsStatusBarAppearanceUpdate];
}else{
self.backImage.image = [UIImage imageNamed:@"返回-7"];
self.backButton.tintColor = [UIColor whiteColor];
self.titlLabel.textColor = [UIColor whiteColor];
刷新状态栏的颜色
self.changeColor = YES;
[self setNeedsStatusBarAppearanceUpdate];
}
/// 头图缩放
if (scroll<0) {
self.headerView.backImageView.frame = CGRectMake(scroll*Width/imageH/2, scroll, Width+2*fabs(scroll*Width/imageH), imageH+fabs(scroll));
}else{
self.headerView.backImageView.frame = CGRectMake(0, 0, Width, imageH);
}
}