去相册选照片时，导航的背景色和页面的背景色不一致，影响美观，需修改。
修改方式：
#pragma mark----UINavigationControllerDelegate
- (void)navigationController:(UINavigationController*)navigationController willShowViewController:(UIViewController*)viewController animated:(BOOL)animated
{
//导航背景色
navigationController.navigationBar.barTintColor=Color_87BA4B;
//右侧取消按钮颜色
[navigationController.navigationBarsetTintColor:[UIColorwhiteColor]];
//标题颜色
[navigationController.navigationBarsetTitleTextAttributes:@{
NSForegroundColorAttributeName: [UIColorwhiteColor],NSFontAttributeName:[UIFontsystemFontOfSize:18.0]
}];
}
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