一開(kāi)始是這樣寫(xiě)的 但是升級(jí)了iOS10 之后就不好使了

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    self.navigationController.navigationBar.translucent = YES;
    [self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsCompact];
    self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];
    [self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor],UITextAttributeTextColor,nil]];
}

-(void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    self.navigationController.navigationBar.translucent = NO;
    [self.navigationController.navigationBar setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];
    [self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor blackColor],UITextAttributeTextColor,nil]];
}

navigationBar不透明

現(xiàn)在透明度是這樣的

- (void)setNavgationBarClear{
    
    self.navigationController.navigationBar.translucent = YES;
    CGRect rect = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 64);
    UIColor *color = [UIColor clearColor];
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    [self.navigationController.navigationBar setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];
    [self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor],UITextAttributeTextColor,nil]];

}

navigationBar透明

但是最好上面下面的 都留著 不然navigationBar最下面會(huì)有一條線(xiàn)