iOS导航栏背景图拉伸

UIImage *backgroundImage = [UIImage imageNamed:@"导航栏背景"];
[self.navigationController.navigationBar setBackgroundImage:backgroundImage forBarMetrics:UIBarMetricsDefault];

一开始这样写，发现在plus上无法填满

image.png

加一句就妥了：

UIImage *backgroundImage = [UIImage imageNamed:@"导航栏背景"];
backgroundImage = [backgroundImage resizableImageWithCapInsets:UIEdgeInsetsZero resizingMode:UIImageResizingModeStretch];
[self.navigationController.navigationBar setBackgroundImage:backgroundImage forBarMetrics:UIBarMetricsDefault];

image.png