ios隐藏导航栏底线条和导航、状态栏浙变色

方法一遍历法：

在你需要隐藏的地方调用如下代码

[self findlineviw:self.navigationBar].hidden = YES;

-(UIImageView*)findlineviw:(UIView*)view{

if ([view isKindOfClass:[UIImageView class]]&&view.bounds.size.height<=1.0) {

return (UIImageView*) view;

}for (UIImageView *subview in view.subviews) {

UIImageView *lineview = [self findlineviw:subview];

if (lineview) {

return lineview;

}

}

return nil;

}

方法二：注意这两句代码一句需要同时配合使用才有效果，可以在不同函数调用，但是必须保证两句代码都会执行到。

self.navigationBar.shadowImage = [UIImage new];

[self.navigationBar setBackgroundImage:[UIImage imageWithColor:kClearColor] forBarMetrics:UIBarMetricsDefault];

二，设置导航栏浙变

方法一：

定制一个view添加到导航栏上：

- (UIView *)navBarView {

if (!_navBarView) {

UIView *navBarView = [[UIView alloc] init];

navBarView.frame = CGRectMake(0, -20, kScreenWidth, 64);

[self.navigationController.navigationBar addSubview:navBarView];

self.navBarView = navBarView;

}

return _navBarView;

}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{

self.navigationItem.title = @"";

CGFloat offsetY = scrollView.contentOffset.y;

if (offsetY > startH) {

CGFloat alpha = MIN(1, 1 - ((startH + 64 - offsetY) / 64));

NSLog(@"%f",alpha);

self.navBarView.backgroundColor = [kBlackColor colorWithAlphaComponent:alpha];

if (offsetY >= (startH + 64)){

//这里设置滚动的时候是否显示标题，不需要可以注释掉

self.navigationItem.title = @"主页";

}

} else {

self.navBarView.backgroundColor = kClearColor;

}

}

方法二：直接改变导航栏的颜色

申明：

/** 滚动到多少高度开始出现 */

static CGFloat const startH = 0;

/** 导航条View */

@property (nonatomic, weak) UIView *navBarView;

实现：

-(void)viewWillAppear:(BOOL)animated

{

[super viewWillAppear:animated];

//设置导航栏的初始颜色

// [self.navigationController.navigationBar setBackgroundImage:[UIImage imageWithColor:[UIColor clearColor]] forBarMetrics:UIBarMetricsDefault];

//建议用这个方法设置初始化颜色，如果不设置barTintColor的颜色，那setBackgroundImage为clearColor时导航栏底色会成默认色

self.navigationController.navigationBar.barTintColor=[UIColor orangeColor];

}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{

//这里设置滚动的时候是否显示标题，不需要可以注释掉

self.navigationItem.title = @"";

CGFloat offsetY = scrollView.contentOffset.y;

if (offsetY > startH) {

CGFloat alpha = MIN(1, 1 - ((startH + 64 - offsetY) / 64));

NSLog(@"%f",alpha);

[self.navigationController.navigationBar setBackgroundImage:[UIImage imageWithColor:[kBlackColor colorWithAlphaComponent:alpha]] forBarMetrics:UIBarMetricsDefault];

if (offsetY >= (startH + 64)){

//这里设置滚动的时候是否显示标题，不需要可以注释掉

self.navigationItem.title = @"主页";

}

} else {

[self.navigationController.navigationBar setBackgroundImage:[UIImage imageWithColor:kClearColor] forBarMetrics:UIBarMetricsDefault];

}

}

方法三：导航栏浙变

- (void)viewDidLoad {

[super viewDidLoad];

self.view.backgroundColor = [UIColor redColor];

self.navigationController.navigationBar.barTintColor = [UIColor blueColor];

}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

{

CGFloat offset = scrollView.contentOffset.y;

if (offset<=0&&offset<=-90) {

self.navigationController.navigationBar.alpha = 0;

}else if(offset<=500){

self.navigationController.navigationBar.alpha = offset/200;

}

}

类扩展的方法：

+ (UIImage *)imageWithColor:(UIColor *)color

{

CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);

UIGraphicsBeginImageContext(rect.size);

CGContextRef context = UIGraphicsGetCurrentContext();

CGContextSetFillColorWithColor(context, [color CGColor]);

CGContextFillRect(context, rect);

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return image;

}

三、滚动时改变状态栏的颜色：

-(void)viewWillAppear:(BOOL)animated
{ self.navigationController.navigationBarHidden = YES;
UIView *statusBarView=[[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 20)];
statusBarView.backgroundColor = kOrangeColor;
[self.view addSubview:statusBarView];
_statusBarView = statusBarView;
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent animated:NO];
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{

CGFloat offsetY = scrollView.contentOffset.y;
if (offsetY > startH) {
CGFloat alpha = MIN(1, (1 - ((startH + 64 - offsetY) / 64))/10.f);
NSLog(@"%f",alpha);
_statusBarView.backgroundColor = [kBlackColor colorWithAlphaComponent:alpha];
// [self.navigationController.navigationBar setBackgroundImage:[UIImage imageWithColor:[kBlackColor colorWithAlphaComponent:alpha]] forBarMetrics:UIBarMetricsDefault];
if (offsetY >= (startH + 64)){
_homePageTableView.backgroundColor = kColorHexValue(0xe6ebeb, 1);
}
} else {
_homePageTableView.backgroundColor = kOrangeColor;
_statusBarView.backgroundColor = kOrangeColor;

// [self.navigationController.navigationBar setBackgroundImage:[UIImage imageWithColor:kClearColor] forBarMetrics:UIBarMetricsDefault];
}
}