Ios7 navigation bar adaptation

The navigation bar is often used during ios ui development. The default style is relatively simple, so you often need to modify the style of the navigation bar.

Ios4:

- (void)drawRect:(CGRect)rect {    UIImage *image = [UIImage imageNamed:@"navbar_bg.png"];    [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];    return;}

After ios5:

 if ([self.navigationController.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)])
{　　[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"navbar_bg.png"] forBarMetrics:UIBarMetricsDefault];}

 

Ios7, because the navigation bar will be extended to the system status bar, so the Image Height needs to be increased by 20 PX. If there is no additional processing, a black bar in the status bar may appear.

        if (7.0 <= [[[UIDevice currentDevice] systemVersion] floatValue])        {            [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"navbar_bg_7.png"] forBarMetrics:UIBarMetricsDefault];        }        else        {            [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"navbar_bg.png"] forBarMetrics:UIBarMetricsDefault];        }