系统自带的侧滑返回只能从边缘开始，现在手机屏幕越来越大，作为一个单手操作很不习惯，为了用户体验，于是我自定义了侧滑返回功能，在下用的是截屏+重写push和pop以及popToRoot，只要继承我写的BBNavigationController这个类就能在全局使用，简单适用(modal出来的抱歉，不支持，仅适用于导航控制器)。对于项目架构的是侧边栏的直接私我，这里需要处理一下截图与侧边栏冲突的问题，这里不作详细处理。废话不多说上代码。
1.添加手势
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UIPanGestureRecognizer *panGesture=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGesture:)];
[self.view addGestureRecognizer:panGesture];
isMoving = NO;
}
2.重写push方法,这里我设置了所有2级子控制器的的返回键，不想要的自行去掉。
#pragma mark - 重写push
/**
* 重写push，是为了截张图片。还有重写navgationItem按钮并监听
*/
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
if (self.childViewControllers.count > 0) {
/* 设置导航栏上面的内容 */
// 设置左边的返回按钮
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = CGRectMake(0, 0, 30, 30);
[btn setImageEdgeInsets:UIEdgeInsetsMake(0, -5, 0, 5)];
[btn setImage:[UIImage imageNamed:@"nav_return"] forState:UIControlStateNormal];
[btn addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:btn];
} else {
}
[self.screenShotsList addObject:[self ViewRenderImage]];
[super pushViewController:viewController animated:animated];
}
/**
* 截图
*/
- (UIImage *)ViewRenderImage
{
//这里如果传window的size会报错,因为程序刚启动的时候界面是push进来的，此时window还没有值，
UIGraphicsBeginImageContextWithOptions(CGSizeMake(KScreenWidth, KScreenHeight), YES, 0.0);
[WINDOW.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
- (void)back
{
// 因为self本来就是一个导航控制器，self.navigationController这里是nil的
[self popViewControllerAnimated:YES];
}
3.重写pop
#pragma mark -重写pop方法
- (UIViewController *)popViewControllerAnimated:(BOOL)animated
{
UIViewController *popVC = nil;
if (animated) {
if (self.childViewControllers.count > 0) {
[self addLastScreenShotView];
}
//先缩放图片 kScaleValue
lastScreenShotView.transform = CGAffineTransformMakeScale(kScaleValue, kScaleValue);
[UIView animateWithDuration:kDurationTime animations:^{
[self moveViewWithX:KScreenWidth];
self.cover.alpha = 0;
} completion:^(BOOL finished) {
[super popViewControllerAnimated:NO];
CGRect frame = self.view.frame;
frame.origin.x = 0;
self.view.frame = frame;
self.cover.alpha = kCoverAphla;
[self.screenShotsList removeLastObject];
if (lastScreenShotView) [lastScreenShotView removeFromSuperview];
}];
popVC = [self.viewControllers lastObject];
}else{
popVC = [super popViewControllerAnimated:NO];
}
return popVC;
}
/**
* 添加背景图片到window上
*/
- (void)addLastScreenShotView
{
UIImage *lastScreenShot = [self.screenShotsList lastObject];
if (lastScreenShotView) [lastScreenShotView removeFromSuperview];
lastScreenShotView = [[UIImageView alloc] initWithImage:lastScreenShot];
[WINDOW insertSubview:lastScreenShotView atIndex:0];
[WINDOW insertSubview:self.cover aboveSubview:lastScreenShotView];
}
4、需要重写popToRoot
#pragma mark - 重写popToRoot
- (NSArray<UIViewController *> *)popToRootViewControllerAnimated:(BOOL)animated {
if (self.childViewControllers.count > 0) {
[self addScreenShotIsTheFirst:YES];
}
//先缩放图片 kScaleValue
lastScreenShotView.transform = CGAffineTransformMakeScale(kScaleValue, kScaleValue);
[UIView animateWithDuration:kDurationTime animations:^{
[self moveViewWithX:[UIScreen mainScreen].bounds.size.width];
self.cover.alpha = 0;
} completion:^(BOOL finished) {
[super popToRootViewControllerAnimated:NO];
CGRect frame = self.view.frame;
frame.origin.x = 0;
self.view.frame = frame;
self.cover.alpha = kCoverAphla;
[self.screenShotsList removeAllObjects];
if (lastScreenShotView) [lastScreenShotView removeFromSuperview];
}];
return self.childViewControllers;
}
5、手势处理
#pragma mark - 手势处理
- (void)handlePanGesture:(UIGestureRecognizer*)sender
{
//顶级 controller 则不执行返回
if(self.viewControllers.count <= 1){
return;
} else {
//得到触摸中在window上拖动的过程中的xy坐标
CGPoint translation = [sender locationInView:WINDOW];
if (translation.x - startTouch.x < 0) {//禁止向左移动
isMoving = NO;
}
if(sender.state == UIGestureRecognizerStateEnded){
isMoving = NO;
//如果结束坐标大于开始坐标100像素就动画效果移动
if (translation.x - startTouch.x > 100) {
[UIView animateWithDuration:kDurationTime animations:^{
[self moveViewWithX:KScreenWidth];
self.cover.alpha = 0;
} completion:^(BOOL finished) {
[self gesturePopViewControllerAnimated:NO];
//将 self.view 的 x 坐标重置为0
CGRect frame = self.view.frame;
frame.origin.x = 0;
self.view.frame = frame;
self.cover.alpha = kCoverAphla;
if (lastScreenShotView) [lastScreenShotView removeFromSuperview];
}];
}else{
//不大于100时就移动原位
[UIView animateWithDuration:kDurationTime animations:^{
[self moveViewWithX:0];
} completion:^(BOOL finished) {
}];
}
}else if(sender.state == UIGestureRecognizerStateBegan){
startTouch = translation;
isMoving = YES;
[self addLastScreenShotView];
}
if (isMoving) {
[self moveViewWithX:translation.x - startTouch.x];
}
}
}
- (UIViewController *)gesturePopViewControllerAnimated:(BOOL)animated
{
[self.screenShotsList removeLastObject];
return [self popViewControllerAnimated:animated];
}
- (void)moveViewWithX:(float)x
{
x = x > KScreenWidth ? KScreenWidth : x;
CGRect frame = self.view.frame;
frame.origin.x = x;
self.view.frame = frame;
float scale;
if (kScaleValue == 1) {
scale = kScaleValue;//缩放大小
} else {
scale = (x / 6400) + kScaleValue;//缩放大小
}
if (x == KScreenWidth) {
lastScreenShotView.transform = CGAffineTransformIdentity;
}else{
//缩放scale
lastScreenShotView.transform = CGAffineTransformMakeScale(scale, scale);
}
}
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