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用系统的手势加到导航控制器的view上,实现全屏返回,很多人都会,可视项目中有很多特殊需求,
一: 真正的全屏返回,包含导航栏.非系统返回效果.使用要尽可能简单.
二: model出来一个导航控制器,我想侧滑时候到根控制器时候,侧滑就 dissmiss掉.
三: 可以禁止单个控制器里的侧滑手势.
四: 返回按钮写在导航控制器里,我想取到点击返回按钮时候调动的方法.可以临时禁止侧滑.
无: 如果控制器里面有横向很长的scrollView,侧滑手势失效,我要处理这个.
#import
@interface QDNavigationController : UINavigationController
//present出来的根控制器,右滑dissmiss 默认关闭 NO
@property (nonatomic, assign) BOOL needDissMiss;
/* 子控制器写下面的方法 可以关闭全屏返回
reture NO 关闭当前页面全屏返回效果 默认开启全屏返回
- (BOOL)QDNavigationControllerEnabled{
return NO;
}
控制器将要pop或 dismiss时候调用 return NO 取消销毁页面,正常销毁页面 return YES;
- (BOOL)QDNavigationControllerWillGoBack{
return YES;
}
目前直接放在控制器View上的scrollView都能自动实现滑动到最左边再手势返回,如果scrollView层级比较深,或者特殊情况下才允许手势返回如(需要手势在页面左侧滑动范围内才生效),需要实现下面方法,return YES后才能手势返回
- (BOOL)QDNavigationControllerAllowDragBack:(UIGestureRecognizer *)gestureRecognizer{
return YES;
}
*/
@end
#import "QDNavigationController.h"
@interface QDNavigationController ()
{
//开始点击的位置
CGPoint startTouch;
//上一个控制器截图
UIImageView *lastScreenShotView;
//返回时页面蒙版
UIView *blackMask;
}
//背景view
@property (nonatomic,strong) UIView *backgroundView;
//截屏图片数组
@property (nonatomic,strong) NSMutableArray *screenShotsList;
//是否动画中
@property (nonatomic,assign) BOOL isMoving;
//拖拽手势
@property (weak, nonatomic) UIPanGestureRecognizer *pan;
@end
@implementation QDNavigationController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.screenShotsList = [NSMutableArray new];
self.needDissMiss = NO;
}
return self;
}
- (void)dealloc{
self.screenShotsList = nil;
[self.backgroundView removeFromSuperview];
self.backgroundView = nil;
}
- (void)viewDidLoad
{
[super viewDidLoad];
//navigationBar 样式
self.navigationBar.translucent = NO;
self.navigationBar.barTintColor = [UIColor whiteColor];
self.navigationBar.backgroundColor = [UIColor whiteColor];
//去掉原来的边缘侧滑手势
self.interactivePopGestureRecognizer.enabled = NO;
self.view.backgroundColor = [UIColor whiteColor];
//拖拽手势
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc]initWithTarget:self
action:@selector(paningGestureReceive:)];
[panRecognizer delaysTouchesBegan];
[self.view addGestureRecognizer:panRecognizer];
panRecognizer.delegate = self;
self.pan = panRecognizer;
}
#pragma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
// 两个Pan手势不能同时触发
if ([otherGestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]) {
return YES;
} else {
return NO;
}
}
//允许多个手势同时响应
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
//手势是否响应
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
//是否是pan手势
BOOL isPanGesture = ([self.pan isEqual:gestureRecognizer]);
if (!isPanGesture) {//非self.pan 拖拽手势,不特殊处理
return YES;
}
CGPoint point = [self.pan velocityInView:self.pan.view];
// 如果是向左滑动，或者y轴的分量过大，那么不启用效果
if ((point.x < 0 || fabs(point.y) > fabs(point.x) / 2)) {
return NO;
}
UIViewController *viewController = [self.viewControllers lastObject];
// -Wundeclared-selector忽略performSelector导致的警告
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wundeclared-selector"
//如果子控制器里实现关闭侧滑手势方法return NO. 手势不生效.
if ([viewController respondsToSelector:@selector(QDNavigationControllerEnabled)]) {
if ([viewController performSelector:@selector(QDNavigationControllerEnabled)] == NO) {
return NO;
}
}
//一定区域内可以滑动,或者webView等scrollView层级比较深的页面,实现QDNavigationControllerAllowDragBack
if ([viewController respondsToSelector:@selector(QDNavigationControllerAllowDragBack:)]) {
if ([viewController performSelector:@selector(QDNavigationControllerAllowDragBack:) withObject:gestureRecognizer] == NO) {
return NO;
}else{
return YES;
}
}
//滑动时候,向右滑动在横向滑动的scrollView的话,滑动到scrollView的contentSize的x == 0时,(最左边)才能触发侧滑手势
//有符合条件的ScrollView 特殊处理
BOOL hasScroll = NO;
//是否可以全屏返回
BOOL needPop = NO;
//触摸点
CGPoint pointNow = [gestureRecognizer locationInView:self.view];
for (UIView *subVi in [self.viewControllers lastObject].view.subviews) {
//这个scrollview包含这点 往右滑 contentSize宽度大于屏幕宽度 在最左边时候 系统手势被屏蔽 手动pop
if ([subVi isKindOfClass:NSClassFromString(@"UIScrollView")]
&& ((UIScrollView *)subVi).contentSize.width > kScreenWidth
){
hasScroll = YES;
//scrollView的ContentSize 转成frame判断触摸点是否在scrollView上
CGSize scrollContentSize = ((UIScrollView *)subVi).contentSize;
CGRect contentSizeRect = CGRectMake(0, 0, scrollContentSize.width, scrollContentSize.height);
//scrollView在最左边 触摸点在scrollView上 可以全屏返回
if ( ((UIScrollView *)subVi).contentOffset.x <= 0
&& CGRectContainsPoint( contentSizeRect, [self.view convertPoint:pointNow toView:subVi])
){
needPop = YES;
break;
}
//触摸点不在scrollView上 可以全屏返回
if (hasScroll == YES && !CGRectContainsPoint( contentSizeRect, [self.view convertPoint:pointNow toView:subVi])) {
needPop = YES;
break;
}
}
}
//不是跟控制器,符合可以侧滑条件
if (self.viewControllers.count > 1 && (hasScroll == NO || needPop == YES)) {
if ([self needGoback] == NO) {
return NO;
}else{
return YES;
}
}else{
if (self.viewControllers.count == 1
&& (hasScroll == NO || needPop == YES)
&& [self.pan translationInView:[self.viewControllers lastObject].view].x > 2) {
//根控制器 符合条件 dismiss
[self popOrDissMiss];
}
return NO;
}
}
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{
if (self.viewControllers.count >= 1 ) {
viewController.hidesBottomBarWhenPushed = YES;
//子控制器创建返回按钮
viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:[self creatBackButton]];
//截图
UIImage *capture = [self _captureForNavigationController:self];
// 有时会获得nil，为防止crash使用[NSNull null]放入数组
if (capture) {
[self.screenShotsList addObject:capture];
} else {
[self.screenShotsList addObject:[NSNull null]];
}
}
[super pushViewController:viewController animated:animated];
}
- (UIViewController *)popViewControllerAnimated:(BOOL)animated{
[self.screenShotsList removeLastObject];
return [super popViewControllerAnimated:animated];
}
//截图
- (UIImage *)_captureForNavigationController:(UINavigationController *)navigationController
{
UIView *view = navigationController.view;
UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, view.window.screen.scale);
/* iOS 7 */
if ([view respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)])
[view drawViewHierarchyInRect:view.bounds afterScreenUpdates:NO];
else /* iOS 5,6 */
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage* ret = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return ret;
}
//返回方法
- (void)popOrDissMiss{
if ([self needGoback] == NO) {
return ;
}
if (self.viewControllers.count == 1 && self.needDissMiss == YES) {
[self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
return;
}
[self popViewControllerAnimated:YES];
}
//如果子控制器实现 QDNavigationControllerWillGoBack方法
- (BOOL)needGoback{
UIViewController *viewController = [self.viewControllers lastObject];
//控制器里面实现QDNavigationControllerWillGoBack方法 并return NO可以取消销毁页面
if ([viewController respondsToSelector:@selector(QDNavigationControllerWillGoBack)]) {
if ([viewController performSelector:@selector(QDNavigationControllerWillGoBack)] == NO) {
return NO;
}
}
return YES;
}
#pragma clang diagnostic pop
//拖拽手势执行
- (void)paningGestureReceive:(UIPanGestureRecognizer *)recoginzer
{
if (self.screenShotsList.count <= 0) return;
UIViewController *currentViewController = [self.viewControllers lastObject];
CGPoint touchPoint = [recoginzer locationInView: [[UIApplication sharedApplication] keyWindow]];
if (recoginzer.state == UIGestureRecognizerStateBegan) {
_isMoving = YES;
startTouch = touchPoint;
if (!self.backgroundView)
{
CGRect frame = self.view.frame;
self.backgroundView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width , frame.size.height)];
[self.view.superview insertSubview:self.backgroundView belowSubview:self.view];
blackMask = [[UIView alloc]initWithFrame:CGRectMake(0, 0, frame.size.width , frame.size.height)];
blackMask.backgroundColor = [UIColor blackColor];
[self.backgroundView addSubview:blackMask];
}
self.backgroundView.hidden = NO;
if (lastScreenShotView) [lastScreenShotView removeFromSuperview];
id lastScreenShotObject = [self.screenShotsList lastObject];
UIImage *lastScreenShot;
if (lastScreenShotObject == [NSNull null]) {
lastScreenShot = nil;
} else {
lastScreenShot = lastScreenShotObject;
}
lastScreenShotView = [[UIImageView alloc]initWithImage:lastScreenShot];
[lastScreenShotView setFrame:CGRectMake(0,
lastScreenShotView.frame.origin.y,
lastScreenShotView.frame.size.height,
lastScreenShotView.frame.size.width)];
[self.backgroundView insertSubview:lastScreenShotView belowSubview:blackMask];
currentViewController.view.userInteractionEnabled = NO;
currentViewController.view.layer.rasterizationScale = [[UIScreen mainScreen] scale];
currentViewController.view.layer.shouldRasterize = YES;
}else if (recoginzer.state == UIGestureRecognizerStateEnded){
//销毁
if (touchPoint.x - startTouch.x > 80)
{
[UIView animateWithDuration:0.2 animations:^{
//适配大屏幕，同时解决了pop不能到屏幕最右边的现象和pop后 邮件列表 和 会话 toolbar重影的问题
[self moveViewWithX:self.view.bounds.size.width];
} completion:^(BOOL finished) {
if (self.viewControllers.count > 1) {
[self popViewControllerAnimated:NO];
}
CGRect frame = self.view.frame;
frame.origin.x = 0;
self.view.frame = frame;
_isMoving = NO;
}];
}
else
{//不销毁返回
[UIView animateWithDuration:0.3 animations:^{
[self moveViewWithX:0];
} completion:^(BOOL finished) {
_isMoving = NO;
self.backgroundView.hidden = YES;
currentViewController.view.userInteractionEnabled = YES;
currentViewController.view.layer.shouldRasterize = NO;
}];
}
return;
}else if (recoginzer.state == UIGestureRecognizerStateCancelled){
[UIView animateWithDuration:0.3 animations:^{
[self moveViewWithX:0];
} completion:^(BOOL finished) {
_isMoving = NO;
self.backgroundView.hidden = YES;
currentViewController.view.layer.shouldRasterize = NO;
}];
return;
}
if (_isMoving) {
[self moveViewWithX:touchPoint.x - startTouch.x];
}
}
//开始移动
- (void)moveViewWithX:(float)x
{
//x < 0时，view已经移动到了最左边了，不需要执行任何操作了
if (x < 0) {
return;
}
CGRect frame = self.view.frame;
frame.origin.x = x;
self.view.frame = frame;
float alpha = 0.4 - (x/800);
blackMask.alpha = alpha;
// 直接将照片贴着屏幕底边展示即可
id lastScreenShotObject = [self.screenShotsList lastObject];
UIImage *lastScreenShot;
if (lastScreenShotObject == [NSNull null]) {
lastScreenShot = nil;
} else {
lastScreenShot = lastScreenShotObject;
}
CGFloat lastScreenShotViewHeight = lastScreenShot.size.height;
CGFloat superviewHeight = lastScreenShotView.superview.frame.size.height;
CGFloat y = superviewHeight - lastScreenShotViewHeight;
CGFloat gapScale = 0.04 * (kScreenWidth - x) / kScreenWidth; //间隙 0
[lastScreenShotView setFrame:CGRectMake(gapScale * kScreenWidth,
y + gapScale * lastScreenShotViewHeight,
(1 - 2 * gapScale) * kScreenWidth,
(1 - 2 * gapScale) * lastScreenShotViewHeight)];
}
//返回按钮
- (UIButton *)creatBackButton{
UIButton *backButton = [[UIButton alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 24.0f, 44.0f)];
[backButton setImage:[UIImage imageNamed:@"daylight-btn-left-arrow-normal"] forState:UIControlStateNormal];
[backButton setImage:[UIImage imageNamed:@"daylight-btn-left-arrow-highlighted"] forState:UIControlStateHighlighted];
[backButton addTarget:self action:@selector(popOrDissMiss) forControlEvents:UIControlEventTouchUpInside];
return backButton;
}
@end