iOS 导航条透明(以及自定义颜色)的方法，去掉导航条底部黑线，随着tableView滚动设置导航条变色
#import
#define NAVBAR_CHANGE_POINT30
@interface UINavigationBar (Awesome)
- (void)lt_setBackgroundColor:(UIColor *)backgroundColor;
- (void)lt_setElementsAlpha:(CGFloat)alpha;
- (void)lt_setTranslationY:(CGFloat)translationY;
- (void)lt_reset;
@end
#import "UINavigationBar+Awesome.h"
#import
#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
@implementation UINavigationBar (Awesome)
staticchar overlayKey;
- (UIView *)overlay
{
return objc_getAssociatedObject(self, &overlayKey);
}
- (void)setOverlay:(UIView *)overlay
{
objc_setAssociatedObject(self, &overlayKey, overlay,OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (void)lt_setBackgroundColor:(UIColor *)backgroundColor
{
if (!self.overlay) {
[selfsetBackgroundImage:[UIImagenew] forBarMetrics:UIBarMetricsDefault];
self.overlay = [[UIViewalloc] initWithFrame:CGRectMake(0,0, CGRectGetWidth(self.bounds),CGRectGetHeight(self.bounds) +20)];
self.overlay.userInteractionEnabled =NO;
self.overlay.autoresizingMask =UIViewAutoresizingFlexibleWidth; // Should not set `UIViewAutoresizingFlexibleHeight`
[[self.subviewsfirstObject] insertSubview:self.overlayatIndex:0];
}
self.overlay.backgroundColor = backgroundColor;
}
- (void)lt_setTranslationY:(CGFloat)translationY
{
self.transform =CGAffineTransformMakeTranslation(0, translationY);
}
- (void)lt_setElementsAlpha:(CGFloat)alpha
{
[[selfvalueForKey:@"_leftViews"]enumerateObjectsUsingBlock:^(UIView *view,NSUInteger i, BOOL *stop) {
view.alpha = alpha;
}];
[[selfvalueForKey:@"_rightViews"]enumerateObjectsUsingBlock:^(UIView *view,NSUInteger i, BOOL *stop) {
view.alpha = alpha;
}];
UIView *titleView = [selfvalueForKey:@"_titleView"];
titleView.alpha = alpha;
// when viewController first load, the titleView maybe nil
[[selfsubviews] enumerateObjectsUsingBlock:^(UIView *obj,NSUInteger idx, BOOL *stop) {
if ([obj isKindOfClass:NSClassFromString(@"UINavigationItemView")]) {
obj.alpha = alpha;
}
if ([obj isKindOfClass:NSClassFromString(@"_UINavigationBarBackIndicatorView")]) {
obj.alpha = alpha;
}
}];
}
- (void)lt_reset
{
[selfsetBackgroundImage:nilforBarMetrics:UIBarMetricsDefault];
[self.overlayremoveFromSuperview];
self.overlay =nil;
}
@end
#pragma mark ————————调用——————————
#import "UINavigationBar+Awesome.h"
@property (nonatomic,strong) UIImageView *navBarHairlineImageView;
- (void)viewDidLoad {
[superviewDidLoad];
// 去底部黑线
_navBarHairlineImageView = [selffindHairlineImageViewUnder:self.navigationController.navigationBar];
}
- (void)viewWillAppear:(BOOL)animated {
[superviewWillAppear:animated];
self.navigationController.navigationBar.translucent = YES;
[self.navigationController.navigationBar lt_setBackgroundColor:[UIColor clearColor]];
_navBarHairlineImageView.hidden = YES;
if (_tableView.contentOffset.y > 30) {
// 导航条加颜色（不再透明）
[self.navigationController.navigationBar lt_setBackgroundColor:[UIColor blueColor]];
// 滑动范围下移动至导航条下从64开始（确保分区头视图贴着导航条下边缘显示）
_tableView.contentInset = UIEdgeInsetsMake(64, 0, 0, 0);
} else {
self.navigationController.navigationBar.translucent = YES;
// 导航条透明
[self.navigationController.navigationBar lt_setBackgroundColor:[UIColor clearColor]];
// 滑动范围熊0开始
_tableView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0);
}
}
-(void)viewWillDisappear:(BOOL)animated {
[superviewWillDisappear:animated];
//导航加颜色
[self.navigationController.navigationBarlt_setBackgroundColor:[UIColorblueColor]];
//显示底部黑线
_navBarHairlineImageView.hidden =NO;
}
// tableView滑动代理方法
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
// tableView 从屏幕最最顶端显示时，当滑动视图下移动至 y > 30时
if (scrollView.contentOffset.y > 30) {
[UIViewanimateWithDuration:0.3animations:^{
// 导航条加颜色（不再透明）
[self.navigationController.navigationBarlt_setBackgroundColor:[UIColorclearColor]];
// 滑动范围下移动至导航条下从64开始（确保分区头视图贴着导航条下边缘显示）
scrollView.contentInset =UIEdgeInsetsMake(64,0, 0,0);
}];
} else {
[UIViewanimateWithDuration:0.3animations:^{
//导航条透明
[self.navigationController.navigationBarlt_setBackgroundColor:[UIColorclearColor]];
//滑动范围熊0开始
scrollView.contentInset =UIEdgeInsetsMake(0,0, 0,0);
}];
}
}
- (UIImageView *)findHairlineImageViewUnder:(UIView *)view {
if ([view isKindOfClass:UIImageView.class] && view.bounds.size.height <=1.0) {
return (UIImageView *)view;
}
for (UIView *subviewin view.subviews) {
UIImageView *imageView = [selffindHairlineImageViewUnder:subview];
if (imageView) {
return imageView;
}
}
return nil;
}