#IOS-navigation中左滑pop的三種方法

#IOS-navigation中左滑pop的三種方法
IOS-navigation中左滑pop的三種方法系統內建pop方法

如果我們沒有對navigation中的back按鈕進行自訂，我們可以直接使用系統內建的左滑pop方法。但是如果我們對back按鈕，進行了自訂，我們就要對self.navigationController.interactivePopGestureRecognizer這個屬性進行設定了。

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

下面是執行個體代碼：

（繼承AbeViewController類，就可以使用系統內建的pop方法。）

#import "AbeViewController.h"@interface AbeViewController ()@end@implementation AbeViewController- (void)viewDidLoad {    [super viewDidLoad];}- (void)viewDidAppear:(BOOL)animated{    //**************方法一****************//    //設定滑動回退    __weak typeof(self) weakSelf = self;                self.navigationController.interactivePopGestureRecognizer.delegate = weakSelf;    //判斷是否為第一個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

自訂邊緣左滑手勢方法

就是實現了一個手勢方法，觸發這個手勢方法時pop。

下面是執行個體代碼：

（繼承AbeViewController類，就可以使用自訂邊緣左滑手勢的pop方法。）

#import "AbeViewController.h"@interface AbeViewController ()@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

自訂view任何位置左移pop

在view中，任何位置左移觸發pop方法。
其實就是建立了一個UIPanGestureRecognizer手勢，然後該手勢觸發方法。

知識點：

[panGestureRecognizer locationInView:XX] 擷取pan手勢的CGPoint。
panGestureRecognizer.state pan的狀態
self.interactivePopGestureRecognizer.enabled = NO; 原生左滑無效

下面是執行個體代碼：

（繼承ABENavViewController類，就可以使用自訂view左滑手勢的pop方法； ABENavViewController為UINavigationController的子類）

#import "ABENavViewController.h"@interface ABENavViewController ()@property (strong, nonatomic)UIPanGestureRecognizer *panGestureRecognizer;@property (strong, nonatomic)UIImageView *backView;@property (strong, nonatomic)NSMutableArray *backImgs;@property (assign) CGPoint panBeginPoint;@property (assign) CGPoint panEndPoint;@end@implementation ABENavViewController- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        //initlization    }    return self;}- (void)loadView{    [super loadView];    [self initilization];}- (void)viewDidLoad {    [super viewDidLoad];    [self loadBaseUI];}- (void)initilization{    self.backImgs = [[NSMutableArray alloc] init];}- (void)loadBaseUI{    //原生方法無效    self.interactivePopGestureRecognizer.enabled = NO;    //設定手勢    self.panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGestureRecognizerAction:)];    [self.view addGestureRecognizer:self.panGestureRecognizer];}#pragma mark- public method- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{    //    UIGraphicsBeginImageContextWithOptions([UIScreen mainScreen].bounds.size, YES, 1.0);    [[UIApplication sharedApplication].keyWindow.layer renderInContext:UIGraphicsGetCurrentContext()];    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    [self.backImgs addObject:img];    [super pushViewController:viewController animated:animated];}- (UIViewController *)popViewControllerAnimated:(BOOL)animated{    [_backImgs removeLastObject];    return [super popViewControllerAnimated:animated];}#pragma mark- private method- (void)panGestureRecognizerAction:(UIPanGestureRecognizer*)panGestureRecognizer{    if ([self.viewControllers count] == 1) {        return ;    }    if (panGestureRecognizer.state == UIGestureRecognizerStateBegan) {        NSLog(@"滑動開始");        //存放滑動開始的位置        self.panBeginPoint = [panGestureRecognizer locationInView:[UIApplication sharedApplication].keyWindow];        //插入圖片        [self insertLastViewFromSuperView:self.view.superview];    }else if(panGestureRecognizer.state == UIGestureRecognizerStateEnded){        NSLog(@"滑動結束");        //存放資料        self.panEndPoint = [panGestureRecognizer locationInView:[UIApplication sharedApplication].keyWindow];        if ((_panEndPoint.x - _panBeginPoint.x) > 50) {            [UIView animateWithDuration:0.3 animations:^{                [self moveNavigationViewWithLenght:[UIScreen mainScreen].bounds.size.width];            } completion:^(BOOL finished) {                [self removeLastViewFromSuperView];                [self moveNavigationViewWithLenght:0];                [self popViewControllerAnimated:NO];            }];        }else{            [UIView animateWithDuration:0.3 animations:^{                [self moveNavigationViewWithLenght:0];            }];        }    }else{        //添加移動效果        CGFloat panLength = ([panGestureRecognizer locationInView:[UIApplication sharedApplication].keyWindow].x - _panBeginPoint.x);        if (panLength > 0) {            [self moveNavigationViewWithLenght:panLength];        }    }}/** *  行動裝置檢視介面 * *  @param lenght 移動的長度 */- (void)moveNavigationViewWithLenght:(CGFloat)lenght{    //圖片位置設定    self.view.frame = CGRectMake(lenght, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height);    //圖片動態陰影    _backView.alpha = (lenght/[UIScreen mainScreen].bounds.size.width)*2/3 + 0.33;}/** *  插圖上一級圖片 * *  @param superView 圖片的superView */- (void)insertLastViewFromSuperView:(UIView *)superView{    //插入上一級視圖背景    if (_backView == nil) {        _backView = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds];        _backView.image = [_backImgs lastObject];;    }    [self.view.superview insertSubview:_backView belowSubview:self.view];}/** *  移除上一級圖片 */- (void)removeLastViewFromSuperView{    [_backView removeFromSuperview];    _backView = nil;}@end