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iOS

Posted by Dominic Anderson
Dominic Anderson
Courses Plus Student 2,743 Points

Styling the Navigation Bar Code Challenge 2 of 3

Hello I'm a little bit stuck, the question says, Now add a line to set the background of the nav bar using the UIImage variable named 'backgroundImage'. Use UIBarMetricsDefault for the 'forBarMetrics' parameter Here is how I answered it. 

#import "AppDelegate.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Customize the nav bar
    UIImage *backgroundImage = [UIImage imageNamed:@"navBarBackground"];
        [[UINavigationBar appearance] setBarTintColor:[UIColor redColor]];
        [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:backgroundImage]forBarMetrics:UIBarMetricsDefault]
    return YES;
}

@end

But I get this error, Bummer! There is a compiler error. Please click on preview to view your syntax errors!

looking at preview it says, 

cannot initialize a parameter of type 'NSString *' with an lvalue of type 'UIImage *'
                [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:backgroundImage]forBarMetrics:UIBarMetricsDefault]
                                                                                     ^~~~~~~~~~~~~~~
note: passing argument to parameter 'name' here
+ (UIImage *)imageNamed:(NSString *)name;
                                    ^
1 error generated.

Does anyone have any pointers?

Dominic Anderson
Dominic Anderson
Courses Plus Student 2,743 Points

Solved should be 

[[UINavigationBar appearance] setBackgroundImage:backgroundImage forBarMetrics:UIBarMetricsDefault];

rather than

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:backgroundImage]forBarMetrics:UIBarMetricsDefault];

1 Answer