Custom background image on UIToolbar in IOS5 SDK

问题

Downloaded IOS5 SDK yesterday, and this code which I use to set my UIToolbar's background to a custom image stopped working. If I set the target to IOS4.3 and below it still works.

[self.bizToolbar insertSubview:[[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"navbar-iphone.png"]] autorelease] atIndex:0];

Anybody encountered this yet on IOS 5?

回答1:

You can use: [[UIToolBar appearance] setBackgroundImage:toolBarIMG forBarMetrics:UIBarMetricsDefault]; (new in iOS 5)

回答2:

Suppose you linked iOS5 beta SDK, you could do something like this

if([navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)] ) {
        //iOS 5 new UINavigationBar custom background
        [navigationBar setBackgroundImage:image forBarMetrics: UIBarMetricsDefault];
}

To realize this, take a look at here iOS 4.3 to iOS 5.0 API Differences and search for "UINavigationBar.h"

or take a close look at the new method signature here setBackgroundImage:forBarMetrics:

Also here is the UIBarMetrics enum type

Hope this helps.

回答3:

This worked on my toolbar:

//toolBar background image set based on iOS version
    [[UIDevice currentDevice] systemVersion];

    if ([[[UIDevice currentDevice] systemVersion] floatValue] > 4.9) {

        //iOS 5
        UIImage *toolBarIMG = [UIImage imageNamed: @"toolBar_brown.png"];  

        if ([toolBar respondsToSelector:@selector(setBackgroundImage:forToolbarPosition:barMetrics:)]) { 
            [toolBar setBackgroundImage:toolBarIMG forToolbarPosition:0 barMetrics:0]; 
        }

    } else {

        //iOS 4
        [toolBar insertSubview:[[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"toolBar_brown.png"]] autorelease] atIndex:0]; 

    }

回答4:

This method is not documented and relies on specific subviews structure of UIToolbar which can be changed from version to version. So that exactly what probably happened with iOS5 release

P.S. If you check updated UIToolBar class reference you'll find another way to customize UIToolBar

回答5:

This is along the same line as Simone's answer, but works for iOS 5 and iOS < 5. This is what I'm using in app. You need to call [UINavigationBar setupIos5PlusNavBarImage] somewhere in your app initialization (applicationDidFinishLaunching: is a good candidate). On iOS 5+, setupIos5PlusNavBarImage will use the new UIAppearance protocol to set the background and the drawRect override will be ignored. On iOS < 5, setupIos5PlusNavBarImage will basically be a no-op and the drawRect will handle drawing the image.

Interface:

@interface UINavigationBar (CustomNavigationBar)

+ (void) setupIos5PlusNavBarImage;

- (void) drawRect: (CGRect) rect;

@end

Implementation:

@implementation UINavigationBar (CustomNavigationBar)

+ (void) setupIos5PlusNavBarImage
{
    if ([UINavigationBar respondsToSelector: @selector(appearance)])
    {
        [[UINavigationBar appearance] setBackgroundImage: [UIImage imageNamed: @"menuBar.png"] forBarMetrics: UIBarMetricsDefault];
    }
}

- (void) drawRect: (CGRect) rect
{
    UIImage* img = [UIImage imageNamed: @"menuBar.png"];
    [img drawInRect: CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}

@end

来源：https://stackoverflow.com/questions/6283534/custom-background-image-on-uitoolbar-in-ios5-sdk

标签

uitoolbar

ios5