//
//  RALoginNavigationController.m
//  Apex And Drivers
//
//  Created by Jack on 2018/10/13.
//  Copyright © 2018年 USAI. All rights reserved.
//

#import "RALoginNavigationController.h"

@interface RALoginNavigationController ()
{
    CAGradientLayer *_gradientLayer;
    UIView *_barBackgroundView, *_gradientView;
}
@end

@implementation RALoginNavigationController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    [self _configAppearance];
}

-(void) viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    if(_gradientView!=nil)
        return;
    
    _gradientLayer = [CAGradientLayer layer];
    
    UIColor *orangeWhiteColor =  ApexDriverOrangeWhiteColor;
    UIColor *orangeColor = ApexDriverOrangeColor;
    _gradientLayer.colors = @[(__bridge id)orangeColor.CGColor, (__bridge id)orangeWhiteColor.CGColor];
    
    _gradientLayer.startPoint = CGPointMake(0, 0);
    _gradientLayer.endPoint = CGPointMake(1, 0);
    _barBackgroundView = [self.navigationBar.subviews objectAtIndex:0];
    
    _gradientView = [UIView new];
    _gradientView.frame = _barBackgroundView.bounds;
    _gradientLayer.frame = _gradientView.bounds;
    
    [_gradientView.layer addSublayer:_gradientLayer];
    [_barBackgroundView addSubview:_gradientView];
    
    [_barBackgroundView addObserver:self forKeyPath:@"frame" options:NSKeyValueObservingOptionNew context:(__bridge void * _Nullable)(self)];
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {
    if (context == (__bridge void * _Nullable)(self)) {
        
        _gradientView.frame = _barBackgroundView.bounds;
        _gradientLayer.frame = _gradientView.bounds;
    }
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [_barBackgroundView removeObserver:self forKeyPath:@"frame"];
}

- (UIStatusBarStyle)preferredStatusBarStyle {
    return UIStatusBarStyleLightContent;
}

- (void)_configAppearance {
    
    [self.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName:ApexDriverWhiteColor}]; // Title Color
    [self.navigationBar setTintColor:ApexDriverWhiteColor]; // BarItem颜色
    self.navigationBar.barTintColor = ApexDriverOrangeColor; // 背景色
    self.navigationBar.translucent = NO;
    
    // 去除Bar黑色分割线
    self.navigationBar.shadowImage = [UIImage new];
    [self.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
    
}

@end