Change color of translucent black UINavigationBar

问题

I stumbled upon this many times, never found a solution. A UINavigationController's navigationBar can be set to black translucent like:

self.navigationController.navigationBar.barStyle=UIBarStyleBlackTranslucent;

Also, there is a translucent property in UINavigationBar, the docs say:

When YES, the navigation bar is drawn with partial opacity, regardless of the bar style. The amount of opacity is fixed and cannot be changed. It is permissible to set the value of this property when the navigation bar is being managed by a navigation controller object.

I tried

self.navigationcontroller.navigationBar.tintColor=[UIColor blueColor];
self.navigationcontroller.navigationBar.translucent=YES;

and a thousand variations: Setting the translucent property first, setting it in the AppDelegate and in the ViewController, setting the barstyle first. The result is always the same: No transparency. Hence my question:

Is it really possible to change the color of a translucent UINavigationBar to something different than black (preferably within a UINavigationController)?.

I hope there is a review-safe solution.

Thanks, m

回答1:

Once you know it, it's fairly simple:

self.navigationController.navigationBar.tintColor = [UIColor blueColor];
self.navigationController.navigationBar.alpha = 0.7f;
self.navigationController.navigationBar.translucent = YES;

The translucent property seems only to determine wether the main view should be visible under the navigation bar, and resizes the view appropiately.

回答2:

To mimic more accurately the translucent effect, meaning that only the background of the navbar is translucent, and the buttons, title and everything else are opaque, you can do like this:

self.navigationController.navigationBar.translucent = YES;
[(UIView*)[self.navigationController.navigationBar.subviews objectAtIndex:0] setAlpha:0.7f];

回答3:

At least in iOS 6 on an iPhone 4S, you can make a colored translucent navigation bar like this:

self.navigationController.navigationBar.tintColor = [UIColor blueColor];
self.navigationController.navigationBar.translucent = YES;

The alpha setting doesn't seem to be necessary anymore. This also leaves my title bright white and my buttons opaque.

回答4:

Here is the solution:

[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
[[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:3.f/255.f green:8.f/255.f blue:61.f/255.f alpha:1]];
self.navigationController.navigationBar.translucent = YES;
self.navigationController.navigationBar.barTintColor = [UINavigationBar appearance].barTintColor;

来源：https://stackoverflow.com/questions/6781466/change-color-of-translucent-black-uinavigationbar