//
//  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 setClearNav];
        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, -64, [UIScreen mainScreen].bounds.size.width, CGRectGetHeight(self.bounds) + 64)];
        } 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 setClearNav];
     [self.overlay removeFromSuperview];
     self.overlay = nil;
}

-(void)setClearNav
{
    NSDictionary *dic = @{NSForegroundColorAttributeName : [UIColor whiteColor],
                              NSFontAttributeName : [UIFont systemFontOfSize:19]};
    if (@available(iOS 15.0, *)) {
            UINavigationBarAppearance *barApp = [UINavigationBarAppearance new];
            barApp.backgroundColor = [UIColor clearColor];
            barApp.titleTextAttributes = dic;
            barApp.backgroundEffect = nil;
            barApp.shadowColor = nil;
            self.scrollEdgeAppearance = nil;
            self.standardAppearance = barApp;
        }else{
            self.titleTextAttributes = dic;
            [self setShadowImage:[UIImage new]];
            [self setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
        }
        //透明
        self.translucent = YES;
    if (self.overlay) {
        [self.overlay removeFromSuperview];
        self.overlay = nil;
    }
    
}

-(void)resetBackgroundImage{
    
    
    [self setNavbgImage:[UIImage imageNamed:@"blackbar.png"]];
    [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;
    
}

-(void)setWhiteNav
{
    
    [self setNavbgImage:[UIImage imageNamed:@"blackbar_white.png"]];
    
    [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault;
}




#pragma mark - 私有
+ (UIColor *)colorWithHexString:(NSString *)stringToConvert
{
    if ([stringToConvert hasPrefix:@"#"])
    {
        stringToConvert = [stringToConvert substringFromIndex:1];
    }
    float alpha=1.0;
    if (stringToConvert.length>6&&![stringToConvert hasPrefix:@"0x"])//含有透明度
    {
        NSString*alphaString=[stringToConvert substringToIndex:2];
        NSScanner *alphaScanner = [NSScanner scannerWithString:alphaString];
        unsigned hex;
        
        if (![alphaScanner scanHexInt:&hex])
        {
            alpha=1.0;
        }
        else
        {
            const char *hexChar = [alphaString cStringUsingEncoding:NSUTF8StringEncoding];
            int hexNumber;
            sscanf(hexChar, "%x", &hexNumber);
            
            alpha=hexNumber/255.0;
            
        }
    }
    
    NSScanner *scanner = [NSScanner scannerWithString:stringToConvert];
    unsigned hexNum;
    
    if (![scanner scanHexInt:&hexNum])
    {
        return [UIColor clearColor];
    }
    
    return      [UIColor \
    colorWithRed:((float)((hexNum & 0xFF0000) >> 16))/255.0 \
    green:((float)((hexNum & 0xFF00) >> 8))/255.0 \
                 blue:((float)(hexNum & 0xFF))/255.0 alpha:alpha];
}
+ (UIImage *)createImageWithColor:(UIColor *)color
{
    CGRect rect=CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return theImage;
}

- (void)setNavbgColorStr:(NSString *)colorStr
{
    
    UIImage *image = [self.class createImageWithColor:[self.class colorWithHexString:colorStr]];
    [self setNavbgImage:image];
}
- (void)setNavbgColor:(UIColor *)color
{
    UIImage *image = [self.class createImageWithColor:color];
    [self setNavbgImage:image];
}
- (void)setNavbgImage:(UIImage *)image
{
  
    if (image) {
        if (@available(iOS 15.0, *)) {
            UINavigationBarAppearance *apperar = [self getNavgationAppearanceWithNavgationController:self];
            apperar.backgroundImage = image;
      //      apperar.backgroundImageContentMode=UIViewContentModeScaleAspectFill;
            self.standardAppearance = apperar;
            self.scrollEdgeAppearance = apperar;
        }else{
            [self setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];
        }
    }
}
-(UIImage*)getNaveImage
{
    
        if (@available(iOS 15.0, *)) {
            UINavigationBarAppearance *apperar = [self getNavgationAppearanceWithNavgationController:self];
            return apperar.backgroundImage;
        }else{
           
            return [self
             backgroundImageForBarMetrics:UIBarMetricsDefault];
        }
    
    return nil;
}

- (UINavigationBarAppearance *)getNavgationAppearanceWithNavgationController:(UINavigationBar *)bar
API_AVAILABLE(ios(13.0)){
    if (@available(iOS 15.0, *)) {
        if (bar.standardAppearance) {
            return bar.standardAppearance;
        }
        
        if (bar.scrollEdgeAppearance) {
            return bar.scrollEdgeAppearance;
        }
        
        return [[UINavigationBarAppearance alloc] init];
    }
    return nil;
}

- (void)setNavTitleColor:(UIColor *)color
{
    
    if (color ) {
        if (@available(iOS 15.0, *)) {
            UINavigationBarAppearance *apperar = [self getNavgationAppearanceWithNavgationController:self];
            apperar.titleTextAttributes = @{NSForegroundColorAttributeName:color};
            self.standardAppearance = apperar;
            self.scrollEdgeAppearance = apperar;
        }else{
            self.titleTextAttributes = @{NSForegroundColorAttributeName:color};
        }
        
    }
}


- (void)setNavTitleFont:(UIFont *)font
{
    if (font ) {
        if (@available(iOS 15.0, *)) {
            UINavigationBarAppearance *apperar = [self getNavgationAppearanceWithNavgationController:self];
            apperar.titleTextAttributes = @{NSFontAttributeName:font};
            self.standardAppearance = apperar;
            self.scrollEdgeAppearance = apperar;
        }else{
            self.titleTextAttributes = @{NSFontAttributeName:font};
        }
        
    }
}
- (void)setNavTitleTextAttributes:(NSDictionary*)attribute
{

    if (attribute) {
        if (@available(iOS 15.0, *)) {
            UINavigationBarAppearance *apperar = [self getNavgationAppearanceWithNavgationController:self];
            apperar.titleTextAttributes = attribute;
            self.standardAppearance = apperar;
            self.scrollEdgeAppearance = apperar;
        }else{
            self.titleTextAttributes = attribute;
        }
        
    }
}
@end