iOS-navigation中左滑pop的三种方法
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。）
#import "AbeViewController.h"@interface AbeViewController ()@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
自己定义边缘左滑手势方法
就是实现了一个手势方法，触发这个手势方法时pop。
以下是实例代码：
（继承AbeViewController类，就能够使用自己定义边缘左滑手势的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
自己定义view不论什么位置左移pop
在view中，不论什么位置左移触发pop方法。
事实上就是建立了一个UIPanGestureRecognizer手势。然后该手势触发方法。知识点：
[panGestureRecognizer locationInView:XX] 获取pan手势的CGPoint。
panGestureRecognizer.state pan的状态 self.interactivePopGestureRecognizer.enabled = NO; 原生左滑无效
以下是实例代码：
（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）
#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{ //原生方法无效 self.interactivePopGestureRecognizer.enabled = NO; //设置手势 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{ //截图 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(@"滑动開始"); //存放滑动開始的位置 self.panBeginPoint = [panGestureRecognizer locationInView:[UIApplication sharedApplication].keyWindow]; //插入图片 [self insertLastViewFromSuperView:self.view.superview]; }else if(panGestureRecognizer.state == UIGestureRecognizerStateEnded){ NSLog(@"滑动结束"); //存放数据 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{ //加入移动效果 CGFloat panLength = ([panGestureRecognizer locationInView:[UIApplication sharedApplication].keyWindow].x - _panBeginPoint.x); if (panLength > 0) { [self moveNavigationViewWithLenght:panLength]; } }}/** * 移动视图界面 * * @param lenght 移动的长度 */- (void)moveNavigationViewWithLenght:(CGFloat)lenght{ //图片位置设置 self.view.frame = CGRectMake(lenght, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height); //图片动态阴影 _backView.alpha = (lenght/[UIScreen mainScreen].bounds.size.width)*2/3 + 0.33;}/** * 插图上一级图片 * * @param superView 图片的superView */- (void)insertLastViewFromSuperView:(UIView *)superView{ //插入上一级视图背景 if (_backView == nil) { _backView = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds]; _backView.image = [_backImgs lastObject];; } [self.view.superview insertSubview:_backView belowSubview:self.view];}/** * 移除上一级图片 */- (void)removeLastViewFromSuperView{ [_backView removeFromSuperview]; _backView = nil;}@end