UINavigationBar全局方式自定义

UIImage *backButtonImage = [[UIImage imageNamed:@"navbar_ic_back.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 30, 30, 30)];
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

[appearance setBackButtonBackgroundImage:leftButton
forState:1
barMetrics:UIBarMetricsDefault];



UIImage *image = [UIImage imageNamed:@"navbar_ic_back.png"];
image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
navigationBar.backIndicatorImage = image;
navigationBar.backIndicatorTransitionMaskImage = image;
navigationBar.tintColor = [UIColor whiteColor];

//title加阴影

NSShadow *shadow = [[NSShadow alloc] init];
shadow.shadowColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.8];
shadow.shadowOffset = CGSizeMake(0, 1);
[navigationBar setTitleTextAttributes: [NSDictionary dictionaryWithObjectsAndKeys: [UIColor colorWithRed:245.0/255.0 green:245.0/255.0 blue:245.0/255.0 alpha:1.0], NSForegroundColorAttributeName, shadow, NSShadowAttributeName, [UIFont fontWithName:@"HelveticaNeue-CondensedBlack" size:21.0], NSFontAttributeName, nil]];