小胖说事29-----iOS中Navigation中左滑pop页面的三种方法

第三中类型。自己定义任何位置返回页面的方式，上边的类就是.m，大家能够贴过去使用。这个类是继承NavigationController的。用这个类初始化rootController就能够了。这里还有源代码可下载。完整的类：http://download.csdn.net/detail/haogaoming123/8906671

1.系统自带pop方法">系统自带pop方法

假设我们没有对navigation中的backbutton进行自己定义，我们能够直接使用系统自带的左滑pop方法。

可是假设我们对backbutton。进行了自己定义，我们就要对self.navigationController.interactivePopGestureRecognizer这个属性进行设置了。关键代码：

__weak typeof(self) weakSelf = self;
   self.navigationController.interactivePopGestureRecognizer.delegate = weakSelf;

以下是实例代码：

（继承AbeViewController类。就能够使用系统自带的pop方法。）

@interface AbeViewController ()<uigesturerecognizerdelegate>
   @end
 
   @implementation AbeViewController
   - (void)viewDidLoad {
    [super viewDidLoad];
   }
 
- (void)viewDidAppear:(BOOL)animated{
    //**************方法一****************//
    //设置滑动回退
    __weak typeof(self) weakSelf = self;                

self.navigationController.interactivePopGestureRecognizer.delegate = weakSelf;
    //推断是否为第一个view
    if (self.navigationController && [self.navigationController.viewControllers count] == 1) {
        self.navigationController.interactivePopGestureRecognizer.enabled = NO;
    }
}
 
#pragma mark- UIGestureRecognizerDelegate
//**************方法一****************//
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    return YES;
}
 
@end

2.自己定义边缘左滑手势方法

          以下是实例代码：

 就是实现了一个手势方法，触发这个手势方法时pop。（继承AbeViewController类，就能够使用自己定义边缘左滑手势的pop方法。

）

@interface AbeViewController ()<uigesturerecognizerdelegate>
   @end
   @implementation AbeViewController
   - (void)viewDidLoad {
    [super viewDidLoad];
   }
   - (void)viewDidAppear:(BOOL)animated{
    //*************方法二*****************//
    UIScreenEdgePanGestureRecognizer *edgePanGestureRecognizer = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(edgePanGesture:)];
    edgePanGestureRecognizer.delegate = self;
    edgePanGestureRecognizer.edges = UIRectEdgeLeft;
    [self.view addGestureRecognizer:edgePanGestureRecognizer];
  }
 - (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
  }
 
#pragma mark- private method
//*************方法二*****************//
- (void)edgePanGesture:(UIScreenEdgePanGestureRecognizer*)edgePanGestureRecognizer{
    [self.navigationController popViewControllerAnimated:YES];
}
#pragma mark- UIGestureRecognizerDelegate
//**************方法二****************//
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    if (self.navigationController && [self.navigationController.viewControllers count] == 1) {
        return NO;
    }
    return YES;
}
@end

3.自己定义view不论什么位置左移pop

      事实上就是建立了一个UIPanGestureRecognizer手势，然后该手势触发方法。panGestureRecognizer.state pan的状态。

而且设置self.interactivePopGestureRecognizer.enabled = NO; 原生左滑无效
      以下是实例代码：在view中，不论什么位置左移触发pop方法。

知识点：[panGestureRecognizer locationInView:XX] 获取pan手势的CGPoint。

（继承ABENavViewController类，就能够使用自己定义view左滑手势的pop方法； ABENavViewController为UINavigationController的子类。

//
//  NavigationViewController.m
//  BaseProject
//
//  Created by haogaoming on 15/7/13.
//  Copyright (c) 2015年 郝高明. All rights reserved.
//

#import "NavigationViewController.h"

@interface NavigationViewController ()

@property (nonatomic,strong) UIImageView *backview;
@property (nonatomic,strong) NSMutableArray *backImgs;
@property (nonatomic,assign) CGPoint panBeginPoint;
@property (nonatomic,assign) CGPoint panEndPoint;

@end

@implementation NavigationViewController

- (id)init {
    self = [super init];
    self.delegate = self;
    
    return self;
}
- (id)initWithRootViewController:(UIViewController *)rootViewController {
    self = [super initWithRootViewController:rootViewController];
    self.delegate = self;
    
    return self;
}

-(void)loadView
{
    [super loadView];
    self.backImgs = [NSMutableArray array];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //原生方法无效
    self.interactivePopGestureRecognizer.enabled = NO;
    
    //设置手势
    [self.view AddGestureRecognizer:UIPanGestureRecognizerStyle delegate:self Section:@selector(panGestureRecognizerAction:)];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    return (toInterfaceOrientation == UIInterfaceOrientationPortrait);
}

- (BOOL)shouldAutorotate
{
    return NO;
}

-(UIViewController *)popViewControllerAnimated:(BOOL)animated
{
    [_backImgs removeLastObject];
    return [super popViewControllerAnimated:animated];
}

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
    if (self.viewControllers.count==1) {
        viewController.hidesBottomBarWhenPushed = YES;
    }
    //截图
    UIGraphicsBeginImageContextWithOptions([UIScreen mainScreen].bounds.size, YES, 0.0f);
    [[UIApplication sharedApplication].keyWindow.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    [self.backImgs addObject:img];
    
    sleep(0.5); //防止没有截频成功
    [super pushViewController:viewController animated:animated];
}

#pragma make-method
-(void)panGestureRecognizerAction:(UIPanGestureRecognizer *)panGesture
{
    if (self.viewControllers.count == 1) {
        return;
    }

    if (panGesture.state == UIGestureRecognizerStateBegan) {
        //滑动開始
        self.panBeginPoint = [panGesture locationInView:[UIApplication sharedApplication].keyWindow];
        //插入图片
        [self insertLastViewFromSuperView:self.view.superview];
    }else if (panGesture.state == UIGestureRecognizerStateEnded){
        //滑动结束
        self.panEndPoint = [panGesture locationInView:[UIApplication sharedApplication].keyWindow];
        if (self.view.left >= (self.view.width/2.0)-50) {
            [UIView animateWithDuration:0.3 animations:^{
                [self moveNavigationViewWithLength:[UIScreen mainScreen].bounds.size.width];
            } completion:^(BOOL finished) {
                [self removeLastViewFromSuperview];
                [self moveNavigationViewWithLength:0];
                [self popViewControllerAnimated:NO];
            }];
        }else{
            [UIView animateWithDuration:0.3 animations:^{
                [self moveNavigationViewWithLength:0];
            }];
        }
    }else{
        CGPoint point = [panGesture locationInView:[UIApplication sharedApplication].keyWindow];
        //防止右滑
        if ((point.x-self.panBeginPoint.x)<0) {
            return;
        }
        [self moveNavigationViewWithLength:(point.x-self.panBeginPoint.x)];
    }
}
/**
 *  更改frame的位置
 *
 *  @param lenght self.view的left位置
 */
-(void)moveNavigationViewWithLength:(CGFloat)lenght
{
    //图片位置设置
    self.view.frame = CGRectMake(lenght, self.view.top, self.view.width, self.view.height);
    //图片动态阴影
    _backview.alpha = (lenght/[UIScreen mainScreen].bounds.size.width)*2/3 + 0.5;
}
/**
 *  将背景图插入到当前view的下边。然后通过改变self.view的frame实现滑动
 *
 *  @param supView 画布
 */
-(void)insertLastViewFromSuperView:(UIView *)supView
{
    //插入上一级视图背景
    if (_backview == nil) {
        _backview = [[UIImageView alloc]initWithFrame:[UIScreen mainScreen].bounds];
    }   _backview.image = [_backImgs lastObject];

[supView insertSubview:_backview belowSubview:self.view];}/** * 移除背景图 */-(void)removeLastViewFromSuperview{ [_backview removeFromSuperview]; _backview = nil;}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end