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//
// RxWebViewController.m
// RxWebViewController
//
// Created by roxasora on 15/10/23.
// Copyright © 2015年 roxasora. All rights reserved.
//
#import "RxWebViewController.h"
#import "NJKWebViewProgress.h"
#import "NJKWebViewProgressView.h"
#define boundsWidth self.view.bounds.size.width
#define boundsHeight self.view.bounds.size.height
@interface RxWebViewController ()<UIWebViewDelegate,UINavigationControllerDelegate,UINavigationBarDelegate,NJKWebViewProgressDelegate>
@property (nonatomic)UIBarButtonItem* customBackBarItem;
@property (nonatomic)UIBarButtonItem* closeButtonItem;
@property (nonatomic)NJKWebViewProgress* progressProxy;
@property (nonatomic)NJKWebViewProgressView* progressView;
/**
* array that hold snapshots
*/
@property (nonatomic)NSMutableArray* snapShotsArray;
/**
* current snapshotview displaying on screen when start swiping
*/
@property (nonatomic)UIView* currentSnapShotView;
/**
* previous view
*/
@property (nonatomic)UIView* prevSnapShotView;
/**
* background alpha black view
*/
@property (nonatomic)UIView* swipingBackgoundView;
/**
* left pan ges
*/
@property (nonatomic)UIPanGestureRecognizer* swipePanGesture;
/**
* if is swiping now
*/
@property (nonatomic)BOOL isSwipingBack;
@end
@implementation RxWebViewController
-(UIStatusBarStyle) preferredStatusBarStyle{
return UIStatusBarStyleLightContent;
}
#pragma mark - init
-(instancetype)initWithUrl:(NSURL *)url{
self = [super init];
if (self) {
self.url = url;
_progressViewColor = [UIColor colorWithRed:119.0/255 green:228.0/255 blue:115.0/255 alpha:1];
}
return self;
}
- (void)viewDidLoad{
[super viewDidLoad];
self.title = @"";
self.view.backgroundColor = [UIColor whiteColor];
//config navigation item
self.navigationItem.leftItemsSupplementBackButton = YES;
self.webView.delegate = self.progressProxy;
[self.view addSubview:self.webView];
[self.webView loadRequest:[NSURLRequest requestWithURL:self.url]];
[self.navigationController.navigationBar addSubview:self.progressView];
// Do any additional setup after loading the view.
}
-(void)viewDidDisappear:(BOOL)animated{
[super viewDidDisappear:animated];
[self.progressView removeFromSuperview];
self.webView.delegate = nil;
}
#pragma mark - public funcs
-(void)reloadWebView{
[self.webView reload];
}
#pragma mark - logic of push and pop snap shot views
-(void)pushCurrentSnapshotViewWithRequest:(NSURLRequest*)request{
// NSLog(@"push with request %@",request);
NSURLRequest* lastRequest = (NSURLRequest*)[[self.snapShotsArray lastObject] objectForKey:@"request"];
//如果url是很奇怪的就不push
if ([request.URL.absoluteString isEqualToString:@"about:blank"]) {
// NSLog(@"about blank!! return");
return;
}
//如果url一样就不进行push
if ([lastRequest.URL.absoluteString isEqualToString:request.URL.absoluteString]) {
return;
}
UIView* currentSnapShotView = [self.webView snapshotViewAfterScreenUpdates:YES];
[self.snapShotsArray addObject:
@{
@"request":request,
@"snapShotView":currentSnapShotView
}
];
// NSLog(@"now array count %d",self.snapShotsArray.count);
}
-(void)startPopSnapshotView{
if (self.isSwipingBack) {
return;
}
if (!self.webView.canGoBack) {
return;
}
self.isSwipingBack = YES;
//create a center of scrren
CGPoint center = CGPointMake(self.view.bounds.size.width/2, self.view.bounds.size.height/2);
self.currentSnapShotView = [self.webView snapshotViewAfterScreenUpdates:YES];
//add shadows just like UINavigationController
self.currentSnapShotView.layer.shadowColor = [UIColor blackColor].CGColor;
self.currentSnapShotView.layer.shadowOffset = CGSizeMake(3, 3);
self.currentSnapShotView.layer.shadowRadius = 5;
self.currentSnapShotView.layer.shadowOpacity = 0.75;
//move to center of screen
self.currentSnapShotView.center = center;
self.prevSnapShotView = (UIView*)[[self.snapShotsArray lastObject] objectForKey:@"snapShotView"];
center.x -= 60;
self.prevSnapShotView.center = center;
self.prevSnapShotView.alpha = 1;
self.view.backgroundColor = [UIColor blackColor];
[self.view addSubview:self.prevSnapShotView];
[self.view addSubview:self.swipingBackgoundView];
[self.view addSubview:self.currentSnapShotView];
}
-(void)popSnapShotViewWithPanGestureDistance:(CGFloat)distance{
if (!self.isSwipingBack) {
return;
}
if (distance <= 0) {
return;
}
CGPoint currentSnapshotViewCenter = CGPointMake(boundsWidth/2, boundsHeight/2);
currentSnapshotViewCenter.x += distance;
CGPoint prevSnapshotViewCenter = CGPointMake(boundsWidth/2, boundsHeight/2);
prevSnapshotViewCenter.x -= (boundsWidth - distance)*60/boundsWidth;
// NSLog(@"prev center x%f",prevSnapshotViewCenter.x);
self.currentSnapShotView.center = currentSnapshotViewCenter;
self.prevSnapShotView.center = prevSnapshotViewCenter;
self.swipingBackgoundView.alpha = (boundsWidth - distance)/boundsWidth;
}
-(void)endPopSnapShotView{
if (!self.isSwipingBack) {
return;
}
//prevent the user touch for now
self.view.userInteractionEnabled = NO;
if (self.currentSnapShotView.center.x >= boundsWidth) {
// pop success
[UIView animateWithDuration:0.2 animations:^{
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
self.currentSnapShotView.center = CGPointMake(boundsWidth*3/2, boundsHeight/2);
self.prevSnapShotView.center = CGPointMake(boundsWidth/2, boundsHeight/2);
self.swipingBackgoundView.alpha = 0;
}completion:^(BOOL finished) {
[self.prevSnapShotView removeFromSuperview];
[self.swipingBackgoundView removeFromSuperview];
[self.currentSnapShotView removeFromSuperview];
[self.webView goBack];
[self.snapShotsArray removeLastObject];
self.view.userInteractionEnabled = YES;
self.isSwipingBack = NO;
}];
}else{
//pop fail
[UIView animateWithDuration:0.2 animations:^{
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
self.currentSnapShotView.center = CGPointMake(boundsWidth/2, boundsHeight/2);
self.prevSnapShotView.center = CGPointMake(boundsWidth/2-60, boundsHeight/2);
self.prevSnapShotView.alpha = 1;
}completion:^(BOOL finished) {
[self.prevSnapShotView removeFromSuperview];
[self.swipingBackgoundView removeFromSuperview];
[self.currentSnapShotView removeFromSuperview];
self.view.userInteractionEnabled = YES;
self.isSwipingBack = NO;
}];
}
}
#pragma mark - update nav items
-(void)updateNavigationItems{
if (self.webView.canGoBack) {
UIBarButtonItem *spaceButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
spaceButtonItem.width = -6.5;
self.navigationController.interactivePopGestureRecognizer.enabled = NO;
[self.navigationItem setLeftBarButtonItems:@[self.closeButtonItem] animated:NO];
//弃用customBackBarItem，使用原生backButtonItem
// [self.navigationItem setLeftBarButtonItems:@[spaceButtonItem,self.customBackBarItem,self.closeButtonItem] animated:NO];
}else{
self.navigationController.interactivePopGestureRecognizer.enabled = YES;
[self.navigationItem setLeftBarButtonItems:nil];
}
}
#pragma mark - events handler
-(void)swipePanGestureHandler:(UIPanGestureRecognizer*)panGesture{
CGPoint translation = [panGesture translationInView:self.webView];
CGPoint location = [panGesture locationInView:self.webView];
// NSLog(@"pan x %f,pan y %f",translation.x,translation.y);
if (panGesture.state == UIGestureRecognizerStateBegan) {
if (location.x <= 50 && translation.x > 0) { //开始动画
[self startPopSnapshotView];
}
}else if (panGesture.state == UIGestureRecognizerStateCancelled || panGesture.state == UIGestureRecognizerStateEnded){
[self endPopSnapShotView];
}else if (panGesture.state == UIGestureRecognizerStateChanged){
[self popSnapShotViewWithPanGestureDistance:translation.x];
}
}
-(void)customBackItemClicked{
[self.webView goBack];
}
-(void)closeItemClicked{
[self.navigationController popViewControllerAnimated:YES];
}
#pragma mark - webView delegate
- (void)webViewDidStartLoad:(UIWebView *)webView {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
}
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
// NSLog(@"navigation type %d",navigationType);
switch (navigationType) {
case UIWebViewNavigationTypeLinkClicked: {
[self pushCurrentSnapshotViewWithRequest:request];
break;
}
case UIWebViewNavigationTypeFormSubmitted: {
[self pushCurrentSnapshotViewWithRequest:request];
break;
}
case UIWebViewNavigationTypeBackForward: {
break;
}
case UIWebViewNavigationTypeReload: {
break;
}
case UIWebViewNavigationTypeFormResubmitted: {
break;
}
case UIWebViewNavigationTypeOther: {
[self pushCurrentSnapshotViewWithRequest:request];
break;
}
default: {
break;
}
}
[self updateNavigationItems];
return YES;
}
- (void)webViewDidFinishLoad:(UIWebView *)webView {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
[self updateNavigationItems];
NSString *theTitle=[webView stringByEvaluatingJavaScriptFromString:@"document.title"];
if (theTitle.length > 10) {
theTitle = [[theTitle substringToIndex:9] stringByAppendingString:@"…"];
}
self.title = theTitle;
// [self.progressView setProgress:1 animated:NO];
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
}
#pragma mark - NJProgress delegate
-(void)webViewProgress:(NJKWebViewProgress *)webViewProgress updateProgress:(float)progress
{
[self.progressView setProgress:progress animated:NO];
}
#pragma mark - setters and getters
-(void)setUrl:(NSURL *)url{
_url = url;
}
-(void)setProgressViewColor:(UIColor *)progressViewColor{
_progressViewColor = progressViewColor;
self.progressView.progressColor = progressViewColor;
}
-(UIWebView*)webView{
if (!_webView) {
_webView = [[UIWebView alloc] initWithFrame:self.view.bounds];
_webView.delegate = (id)self;
_webView.scalesPageToFit = YES;
_webView.backgroundColor = [UIColor whiteColor];
[_webView addGestureRecognizer:self.swipePanGesture];
}
return _webView;
}
-(UIBarButtonItem*)customBackBarItem{
if (!_customBackBarItem) {
UIImage* backItemImage = [[UIImage imageNamed:@"backItemImage"] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
UIImage* backItemHlImage = [[UIImage imageNamed:@"backItemImage-hl"] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
UIButton* backButton = [[UIButton alloc] init];
[backButton setTitle:@"返回" forState:UIControlStateNormal];
[backButton setTitleColor:self.navigationController.navigationBar.tintColor forState:UIControlStateNormal];
[backButton setTitleColor:[self.navigationController.navigationBar.tintColor colorWithAlphaComponent:0.5] forState:UIControlStateHighlighted];
[backButton.titleLabel setFont:[UIFont systemFontOfSize:17]];
[backButton setImage:backItemImage forState:UIControlStateNormal];
[backButton setImage:backItemHlImage forState:UIControlStateHighlighted];
[backButton sizeToFit];
[backButton addTarget:self action:@selector(customBackItemClicked) forControlEvents:UIControlEventTouchUpInside];
_customBackBarItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
}
return _customBackBarItem;
}
-(UIBarButtonItem*)closeButtonItem{
if (!_closeButtonItem) {
_closeButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"关闭" style:UIBarButtonItemStylePlain target:self action:@selector(closeItemClicked)];
}
return _closeButtonItem;
}
-(UIView*)swipingBackgoundView{
if (!_swipingBackgoundView) {
_swipingBackgoundView = [[UIView alloc] initWithFrame:self.view.bounds];
_swipingBackgoundView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.3];
}
return _swipingBackgoundView;
}
-(NSMutableArray*)snapShotsArray{
if (!_snapShotsArray) {
_snapShotsArray = [NSMutableArray array];
}
return _snapShotsArray;
}
-(BOOL)isSwipingBack{
if (!_isSwipingBack) {
_isSwipingBack = NO;
}
return _isSwipingBack;
}
-(UIPanGestureRecognizer*)swipePanGesture{
if (!_swipePanGesture) {
_swipePanGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(swipePanGestureHandler:)];
}
return _swipePanGesture;
}
-(NJKWebViewProgress*)progressProxy{
if (!_progressProxy) {
_progressProxy = [[NJKWebViewProgress alloc] init];
_progressProxy.webViewProxyDelegate = (id)self;
_progressProxy.progressDelegate = (id)self;
}
return _progressProxy;
}
-(NJKWebViewProgressView*)progressView{
if (!_progressView) {
CGFloat progressBarHeight = 3.0f;
CGRect navigaitonBarBounds = self.navigationController.navigationBar.bounds;
// CGRect barFrame = CGRectMake(0, navigaitonBarBounds.size.height - progressBarHeight-0.5, navigaitonBarBounds.size.width, progressBarHeight);
CGRect barFrame = CGRectMake(0, navigaitonBarBounds.size.height, navigaitonBarBounds.size.width, progressBarHeight);
_progressView = [[NJKWebViewProgressView alloc] initWithFrame:barFrame];
_progressView.progressColor = self.progressViewColor;
_progressView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
}
return _progressView;
}
@end