IOS-navigation中左滑pop的三种方法
系统自带pop方法
如果我们没有对navigation中的back按钮进行自定义，我们可以直接使用系统自带的左滑pop方法。但是如果我们对back按钮，进行了自定义，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;
下面是实例代码：
（继承AbeViewController类，就可以使用系统自带的pop方法。）
#import "AbeViewController.h"
@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;
//判断是否为第一个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。
下面是实例代码：
（继承AbeViewController类，就可以使用自定义边缘左滑手势的pop方法。）
#import "AbeViewController.h"
@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
自定义view任何位置左移pop
在view中，任何位置左移触发pop方法。
其实就是建立了一个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
下面是实例代码：
（继承ABENavViewController类，就可以使用自定义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(@"滑动开始");
//存放滑动开始的位置
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{
//添加移动效果
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