之前自定义了navigationBar的背景颜色，升级到iOS10后，发现title,跟leftBarButtonItem不显示。 iOS9 之前的navigationBar的背景是_UINavigationBarBackground，到iOS变成了_UIBarBackground，可以通过xcode查看一下相应的布局。我的解决办法是，分别判断iOS10，iOS9的版本，找到对应的背景图，将起隐藏掉，可以消除分割线。然后重新创建一个视图层，颜色可以自定义，需要注意在添加视图或者更新视图时要放到主线程里，同时这个方法需要在viewWillAppear里调用。
#define isIOS9 ([[UIDevice currentDevice].systemVersion intValue]>=9?YES:NO)
#define isIOS10 ([[UIDevice currentDevice].systemVersion intValue]>=10?YES:NO)
#pragma mark - 动态修改状态栏跟顶部导航栏的颜色
-(void)changeNavigationBarBackgroundColor:(UIColor *)barBackgroundColor{
if ([self.navigationController.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)]){
NSArray *subviews =self.navigationController.navigationBar.subviews;
for (id viewObj in subviews) {
if (isIOS10) {
//iOS10,改变了状态栏的类为_UIBarBackground
NSString *classStr = [NSString stringWithUTF8String:object_getClassName(viewObj)];
if ([classStr isEqualToString:@"_UIBarBackground"]) {
UIImageView *imageView=(UIImageView *)viewObj;
imageView.hidden=YES;
}
}else{
//iOS9以及iOS9之前使用的是_UINavigationBarBackground
NSString *classStr = [NSString stringWithUTF8String:object_getClassName(viewObj)];
if ([classStr isEqualToString:@"_UINavigationBarBackground"]) {
UIImageView *imageView=(UIImageView *)viewObj;
imageView.hidden=YES;
}
}
}
UIImageView *imageView = [self.navigationController.navigationBar viewWithTag:111];
if (!imageView) {
imageView=[[UIImageView alloc] initWithFrame:CGRectMake(0, -20, self.view.width, 64)];
imageView.tag = 111;
[imageView setBackgroundColor:barBackgroundColor];
dispatch_async(dispatch_get_main_queue(), ^{
[self.navigationController.navigationBar insertSubview:imageView atIndex:0];
});
}else{
[imageView setBackgroundColor:barBackgroundColor];
dispatch_async(dispatch_get_main_queue(), ^{
[self.navigationController.navigationBar sendSubviewToBack:imageView];
});
}
}
}