JSJP_School/LN_School/MyUINavigationController.m

//
//  MyUINavigationController.m
//  jiaPeiC
//
//  Created by Echopentakill on 16/12/13.
//  Copyright © 2016年 JCZ. All rights reserved.
//

#import "MyUINavigationController.h"

@interface MyUINavigationController ()<UINavigationControllerDelegate, UIGestureRecognizerDelegate>

@end

@implementation MyUINavigationController

// 第一次使用这个类调用一次
+ (void)initialize {
	// 2.设置UINavigationBar的主题
	[self rq_setupNavigationBarTheme];
	
	// 3.设置UIBarButtonItem的主题
	[self rq_setupBarButtonItemTheme];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    __weak MyUINavigationController *weakSelf = self;
    
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
    {
        self.interactivePopGestureRecognizer.delegate = weakSelf;
        self.delegate = weakSelf;
    }
}

/**
 *  设置UINavigationBarTheme的主题
 */
+ (void)rq_setupNavigationBarTheme {
	UINavigationBar *appearance = [UINavigationBar appearance];
	
	/// 设置背景
	//!!!: 必须设置为透明  不然布局有问题 ios8以下  会崩溃/ 如果iOS8以下  请再_setup里面 设置透明 self.navigationBar.translucent = YES;
	[appearance setTranslucent:YES]; /// 必须设置YES
	
	// 设置导航栏的样式
	[appearance setBarStyle:UIBarStyleDefault];
	//设置导航栏文字按钮的渲染色
	[appearance setTintColor:RQColorFromHexString(@"#333333")];
	// 设置导航栏的背景渲染色
	[appearance setBarTintColor:RQMianColor];
	// 设置文字属性
	NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];
	textAttrs[NSFontAttributeName] = [UIFont fontWithName:@"Helvetica-Bold" size:17.f];
	textAttrs[NSForegroundColorAttributeName] = RQColorFromHexString(@"#ffffff");
	
	// UIOffsetZero是结构体, 只要包装成NSValue对象, 才能放进字典\数组中
	NSShadow *shadow = [[NSShadow alloc] init];
	shadow.shadowOffset =  CGSizeZero;
	textAttrs[NSShadowAttributeName] = shadow;
	[appearance setTitleTextAttributes:textAttrs];
	
	/// 去掉导航栏的阴影图片
	[appearance setShadowImage:[UIImage new]];
	[appearance setBackgroundImage:[UIImage yy_imageWithColor:RQMianColor] forBarMetrics:UIBarMetricsDefault];
}

/**
 *  设置UIBarButtonItem的主题
 */
+ (void)rq_setupBarButtonItemTheme {
	// 通过appearance对象能修改整个项目中所有UIBarButtonItem的样式
	UIBarButtonItem *appearance = [UIBarButtonItem appearance];
	
	CGFloat fontSize = 16.0f;
	
	/**设置文字属性**/
	// 设置普通状态的文字属性
	NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];
	textAttrs[NSForegroundColorAttributeName] = [UIColor whiteColor];
	textAttrs[NSFontAttributeName] = [UIFont systemFontOfSize:fontSize];
	NSShadow *shadow = [[NSShadow alloc] init];
	shadow.shadowOffset =  CGSizeZero;
	textAttrs[NSShadowAttributeName] = shadow;
	[appearance setTitleTextAttributes:textAttrs forState:UIControlStateNormal];
	
	
	// 设置高亮状态的文字属性
	NSMutableDictionary *highTextAttrs = [NSMutableDictionary dictionaryWithDictionary:textAttrs];
	highTextAttrs[NSForegroundColorAttributeName] = [[UIColor whiteColor] colorWithAlphaComponent:.5f];
	[appearance setTitleTextAttributes:highTextAttrs forState:UIControlStateHighlighted];
	
	// 设置不可用状态(disable)的文字属性
	NSMutableDictionary *disableTextAttrs = [NSMutableDictionary dictionaryWithDictionary:textAttrs];
	disableTextAttrs[NSForegroundColorAttributeName] = [[UIColor whiteColor] colorWithAlphaComponent:.5f];
	[appearance setTitleTextAttributes:disableTextAttrs forState:UIControlStateDisabled];
}


//在转场/过渡的时候禁用 interactivePopGestureRecognizer当用户在转场的时候触发一个后退手势,则各种事件又凑一块了.导航栈内又成了混乱的.我的解决办法是,转场效果的过程中禁用手势识别,当新的视图控制器加载完成后再启用.再次建议使用UINavigationController的子类操作

-(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
        self.interactivePopGestureRecognizer.enabled = NO;
    
    [super pushViewController:viewController animated:animated];
}


#pragma mark UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    // Enable the gesture again once the new controller is shown
    
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
        self.interactivePopGestureRecognizer.enabled = YES;
}

//
//解决左滑手势冲突和不灵敏的问题
-(UIViewController *)popViewControllerAnimated:(BOOL)animated {
    
    return [super popViewControllerAnimated:YES];
}
#pragma mark UIGestureRecognizerDelegate
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    if ([self.childViewControllers count] == 1) {
        return NO;
    }
    return YES;
}

// 我们差不多能猜到是因为手势冲突导致的，那我们就先让 ViewController 同时接受多个手势吧
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    return YES;
}

//运行试一试，两个问题同时解决，不过又发现了新问题，手指在滑动的时候，被 pop 的 ViewController 中的 UIScrollView 会跟着一起滚动，这个效果看起来就很怪（知乎日报现在就是这样的效果），而且也不是原始的滑动返回应有的效果，那么就让我们继续用代码来解决吧
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return [gestureRecognizer isKindOfClass:UIScreenEdgePanGestureRecognizer.class];
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end