UIToolbarに背景画像を設定。iOS5とiOS4に対応する方法。

gistfile1.m

// 出所：http://stackoverflow.com/questions/6341503/uinavigationbar-custom-background-image
// 関連：http://www.mladjanantic.com/setting-custom-background-for-uinavigationbar-what-will-work-on-ios5-and-ios4-too/

    toolBar = [[UIToolbar alloc] initWithFrame:toolBarBounds];
    [toolBar sizeToFit];
    
    // set BackgroudImage
    if ([[[UIDevice currentDevice] systemVersion] floatValue] > 4.9) {
        
        //iOS 5
        
        if ([toolBar respondsToSelector:@selector(setBackgroundImage:forToolbarPosition:barMetrics:)]) { 
            [toolBar setBackgroundImage:[UIImage imageNamed: @"black.png"] 
                     forToolbarPosition:UIToolbarPositionAny 
                             barMetrics:UIBarMetricsDefault]; 
        }
        
    } else {
        
        //iOS 4
        [toolBar insertSubview:[[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"black.png"]] autorelease] atIndex:0]; 
        
    }