//
//  UINavigationBar+Background.m
//  CustomNavicationController
//
//  Created by YiJiang Chen on 15/10/22.
//  Copyright (c) 2015年 YiJiang Chen. All rights reserved.
//
#import <objc/runtime.h>
#import "UINavigationBar+Background.h"

@implementation UINavigationBar (Background)
static char overlayKey;

- (UIView *)overlay
{
    return objc_getAssociatedObject(self, &overlayKey);
}

- (void)setOverlay:(UIView *)overlay
{
    objc_setAssociatedObject(self, &overlayKey, overlay, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (void)cnSetBackgroundColor:(UIColor *)backgroundColor
{
    if (!self.overlay) {
        [self setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
        self.overlay = [[UIView alloc] initWithFrame:CGRectMake(0, -20, [UIScreen mainScreen].bounds.size.width, CGRectGetHeight(self.bounds) + 20)];
        if (@available(iOS 11.0, *)) {
            self.overlay = [[UIView alloc] initWithFrame:CGRectMake(0, -44, [UIScreen mainScreen].bounds.size.width, CGRectGetHeight(self.bounds) + 44)];
        } else {
            self.overlay = [[UIView alloc] initWithFrame:CGRectMake(0, -20, [UIScreen mainScreen].bounds.size.width, CGRectGetHeight(self.bounds) + 20)];
        }
        self.overlay.userInteractionEnabled = NO;
        self.overlay.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
        [self insertSubview:self.overlay atIndex:0];
    }
    
    self.overlay.backgroundColor = backgroundColor;
}

- (void)cnReset
{
    
    [self setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
     [self.overlay removeFromSuperview];
     self.overlay = nil;
}

-(void)setClearNav
{
    
    [self setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
    //设置那条横线直接隐藏
    self.shadowImage = [[UIImage alloc] init];
    if (self.overlay) {
        [self.overlay removeFromSuperview];
        self.overlay = nil;
    }
    
}

-(void)resetBackgroundImage{
    
    [self setBackgroundImage:[UIImage imageNamed:@"blackbar.png"] forBarMetrics:UIBarMetricsDefault];
    [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent animated:NO];
    
}

-(void)setWhiteNav
{
    [self setBackgroundImage:[UIImage imageNamed:@"blackbar_white.png"] forBarMetrics:UIBarMetricsDefault];
    
     [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault animated:NO];
}


@end