//按比例显示图片
UIImage *backGroundImage = [UIImage imageNamed:@”titleImage”];
backGroundImage = [backGroundImage resizableImageWithCapInsets:UIEdgeInsetsZero resizingMode:UIImageResizingModeStretch];
[self.navigationController.navigationBar setBackgroundImage:backGroundImage forBarMetrics:UIBarMetricsDefault];
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作者：曾三岁
来源：CSDN
原文：https://blog.csdn.net/zsansui/article/details/76083141
版权声明：本文为博主原创文章，转载请附上博文链接！
