navigationBar 颜色 不透明

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UIImage * backImage = [UIImage imageWithColor:[UIColor colorWithHexValue:@"#292929"] rect:CGRectMake(0, 0, self.view.width, 64)];
self.navigationController.navigationBar.backgroundColor = [UIColor colorWithHexValue:@"#292929"];
[self.navigationController.navigationBar setBackgroundImage:backImage forBarMetrics:UIBarMetricsDefault];

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