iOS navigation 透明处理

#pragma mark - 导航条透明

- (void)setNavigationBarType {

    self.navigationController.navigationBar.translucent = YES;

    UIColor *color = [UIColorclearColor];

    CGRect rect =CGRectMake(0,0, GetScreenWidth(),64);

    UIGraphicsBeginImageContext(rect.size);

    CGContextRef context =UIGraphicsGetCurrentContext();

    CGContextSetFillColorWithColor(context, [colorCGColor]);

    CGContextFillRect(context, rect);

    UIImage *image =UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    [self.navigationController.navigationBarsetBackgroundImage:image forBarMetrics:UIBarMetricsDefault];

    

    self.navigationController.navigationBar.clipsToBounds = YES;

}