/**

　　只需要在你自定义的导航控制器中，改成如下代码即可，自定义手势返回

*/

#define KEY_WINDOW [[UIApplication sharedApplication] keyWindow]

#define kScreenW KEY_WINDOW.bounds.size.width

#define kAnimateDuration 0.3

#define kDefaultAlapa 0.5

#define kDefaultScale 0.95

#define iOS7 ([UIDevice currentDevice].systemVersion.floatValue >= 7.0)

#import "CXNavigationController.h"

#import <QuartzCore/QuartzCore.h>

@interfaceCXNavigationController ()

{

NSMutableArray *_images; //图片数组

UIView *_bgView; //背景图

UIView *_blankMask; //面罩

UIImageView *_imageView; //图像

CGPoint _startPoint; //开始接触点

}

@end

@implementation CXNavigationController

- (void)viewDidLoad{

[superviewDidLoad];

_images = [NSMutableArrayarray];

if (!iOS7) {

UIPanGestureRecognizer *pan = [[UIPanGestureRecognizeralloc] initWithTarget:selfaction:@selector(panMove:)];

[self.viewaddGestureRecognizer:pan];

}

}

- (void)panMove:(UIPanGestureRecognizer *)pan{

if (self.viewControllers.count <= 1) {

return;

}

CGRect selfF = self.view.frame;

CGPoint location = [pan locationInView:KEY_WINDOW];

if (pan.state == UIGestureRecognizerStateBegan) { //开始拖拽

_startPoint = location;

_imageView.image = [_imageslastObject];

[KEY_WINDOWinsertSubview:_bgViewbelowSubview:self.tabBarController.view];

_imageView.transform = CGAffineTransformMakeScale(kDefaultScale, kDefaultScale);

}elseif(pan.state == UIGestureRecognizerStateChanged){ //拖拽中

CGFloat marginX = location.x - _startPoint.x;

marginX = marginX > kScreenW ? kScreenW : marginX;

marginX = marginX < 0 ? 0 : marginX;

selfF.origin.x = marginX;

self.view.frame = selfF;

CGFloat scale = kDefaultScale + marginX * 1.0 / 6400;

scale = marginX == kScreenW ? 0.5 : scale;

scale = marginX == 0 ? 0 : scale;

_imageView.transform = CGAffineTransformMakeScale(scale, scale);

CGFloat alpha = kDefaultAlapa - (1 - kDefaultAlapa) * marginX * 1.0 / kScreenW;

alpha = marginX == kScreenW ? kDefaultAlapa : alpha;

alpha = marginX == 0 ? 0 : alpha;

_blankMask.alpha = alpha;

}elseif(pan.state == UIGestureRecognizerStateEnded){ //结束

CGFloat marginX = location.x - _startPoint.x;

if (marginX > 50) {

marginX = marginX > kScreenW ? kScreenW : marginX;

CGFloat dur = kAnimateDuration - marginX * 1.0 / 2000;

[UIViewanimateWithDuration:dur animations:^{

CGRect selfF = self.view.frame;

selfF.origin.x = KEY_WINDOW.bounds.size.width;

self.view.frame = selfF;

_blankMask.alpha = 0;

_imageView.transform = CGAffineTransformMakeScale(1, 1);

} completion:^(BOOL finished) {

[_images removeLastObject];

[_bgView removeFromSuperview];

CGRect rect = self.view.frame;

rect.origin.x = 0;

self.view.frame = rect;

[superpopViewControllerAnimated:NO];

}];

}else{

CGFloat marginX = location.x - _startPoint.x;

marginX = marginX > 50 ? 50 : marginX;

marginX = marginX < 0 ? 0 : marginX;

CGFloat dur = marginX * 1.0 / 500;

[UIViewanimateWithDuration:0.1 + dur  animations:^{

CGRect selfF = self.view.frame;

selfF.origin.x = 0;

self.view.frame = selfF;

}];

}

}

}

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{

if (self.viewControllers.count > 0) {

if (!iOS7) {

[self createBg];

}

}

[super pushViewController:viewController animated:animated];

}

#pragma mark 创建背景

- (void)createBg{

[_imagesaddObject:[selfcurrentScreenImage]];

if (!_bgView) {

_bgView = [[UIView alloc] initWithFrame:KEY_WINDOW.bounds];

_bgView.backgroundColor = [UIColorblackColor];

_imageView = [[UIImageView alloc] initWithFrame:KEY_WINDOW.bounds];

_imageView.backgroundColor = [UIColorclearColor];

[_bgViewaddSubview:_imageView];

_blankMask = [[UIView alloc] initWithFrame:KEY_WINDOW.bounds];

_blankMask.backgroundColor = [UIColorblackColor];

_blankMask.alpha = kDefaultAlapa;

[_bgViewaddSubview:_blankMask];

}

}

#pragma mark 获取当期屏幕

- (UIImage *)currentScreenImage{

UIGraphicsBeginImageContextWithOptions(KEY_WINDOW.bounds.size, self.view.opaque, 0.0);

if (self.topViewController.tabBarController) {

[self.topViewController.tabBarController.view.layerrenderInContext:UIGraphicsGetCurrentContext()];

}else{

[self.view.layerrenderInContext:UIGraphicsGetCurrentContext()];

}

UIImage * img = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return img;

}