手势移除控制器

如果滑动移除控制器的功能失效，清空代理(让导航控制器重新设置这个功能)

self.interactivePopGestureRecognizer.delegate=nil;

//RLNavigaitionController.m

//RLNavigaitionDemo

//Created  16/7/3.

//Copyright © 2016年. All rights reserved.

#import"RLNavigaitionController.h"

@interfaceRLNavigaitionController()

@property(nonatomic,strong)NSMutableArray*images;

@property(nonatomic,strong)UIImageView*screenView;

@property(nonatomic,strong)UIView*coverView;

@end

---

@implementationRLNavigaitionController

- (void)viewDidLoad {

[superviewDidLoad];

UIPanGestureRecognizer*gesture = [[UIPanGestureRecognizeralloc]initWithTarget:selfaction:@selector(panBack:)];

[self.viewaddGestureRecognizer:gesture];

}

-(void)viewDidAppear:(BOOL)animated

{

if(self.images.count>0)return;

[selfscreenSnapShot];

}

-(void)screenSnapShot

{

UIGraphicsBeginImageContextWithOptions(self.view.frame.size,NO,1);

CGContextRefcontext =UIGraphicsGetCurrentContext();

[self.view.layerrenderInContext:context];

UIImage*image =UIGraphicsGetImageFromCurrentImageContext();

[self.imagesaddObject:image];

UIGraphicsEndImageContext();

}

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

{

[superpushViewController:viewControlleranimated:animated];

[selfscreenSnapShot];

}

-(UIViewController*)popViewControllerAnimated:(BOOL)animated

{

[self.imagesremoveLastObject];

return[superpopViewControllerAnimated:animated];

}

-(void)panBack:(UIPanGestureRecognizer*)gesture

{

CGFloattranslationx = [gesturetranslationInView:self.view].x;

if(translationx <0||self.images.count<2)return;

self.screenView.image=self.images[self.images.count-2];

UIWindow*window = [UIApplicationsharedApplication].keyWindow;

[windowinsertSubview:self.screenViewatIndex:0];

[windowinsertSubview:self.coverViewaboveSubview:_screenView];

gesture.view.transform=CGAffineTransformMakeTranslation(translationx,0);

if(gesture.state==UIGestureRecognizerStateEnded|| gesture.state==UIGestureRecognizerStateCancelled) {

gesture.view.transform=CGAffineTransformIdentity;

if(translationx >self.view.frame.size.width*0.5) {

[selfpopViewControllerAnimated:NO];

[self.screenViewremoveFromSuperview];

[self.coverViewremoveFromSuperview];

}

}

}

-(NSMutableArray*)images

{

if(!_images) {

_images= [NSMutableArrayarray];

}

return_images;

}

-(UIImageView*)screenView

{

if(!_screenView) {

_screenView= [[UIImageViewalloc]initWithFrame:[UIScreenmainScreen].bounds];

}

return_screenView;

}

-(UIView*)coverView

{

if(!_coverView) {

_coverView= [[UIViewalloc]initWithFrame:[UIScreenmainScreen].bounds];

_coverView.backgroundColor= [UIColorcolorWithRed:0.5green:0.5blue:0.5alpha:0.5];

}

return_coverView;

}

@end