前言
iOS 8 之后出现了WKWebView，占用内存少，通过WebKit可以和js交互。最重要是可以监测网页加载的进度，之前用UIWebView做的进度条都假象。
代码
WebKit中WebView交互被细化了，主要分为WKNavigationDelegate，WKUIDelegate，WKWebViewConfiguration。
WKNavigationDelegate主要处理网页导航的一些协议。
WKUIDelegate 主要处理用户的一些协议（The web view's user interface delegate）
WKWebViewConfiguration中是配置文件，可以配置一些属性，比如和js交互的声明配置。
代码：
#import "LXWebViewController.h"
#import <WebKit/WebKit.h>
#import "LxButton.h"
#import "LXWebViewProgressView.h"
@interface LXWebViewController ()<WKNavigationDelegate,WKUIDelegate>
{
BOOL isFirstLoad;
}
@property (nonatomic, strong) WKWebView *webView;
@property (nonatomic, strong) NSString *url;
@property (nonatomic, strong) NSString *navTitle;
@property (nonatomic, strong) LXWebViewProgressView *progressView;
@end
@implementation LXWebViewController
-(instancetype)initWithUrl:(NSString *)url title:(NSString *)title{
self = [super init];
if (self) {
self.url = url;
self.navTitle = title;
}
return self;
}
-(void)setIsPresent:(BOOL)isPresent{
_isPresent = isPresent;
}
-(void)viewWillAppear:(BOOL)animated{
if (isFirstLoad) {
[self.webView reload];
}else{
isFirstLoad = YES;
}
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.navigationItem.title = self.navTitle;
[self setup];
[self configNavBar];
[self responData];
}
-(void)configNavBar{
UIView *container =[[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 44)];
LxButton *backBtn = [LxButton LXButtonWithTitle:nil titleFont:nil Image:[UIImage imageNamed:@"LX_back"] backgroundImage:nil backgroundColor:nil titleColor:nil frame:CGRectMake(5, 14, 25, 25)];
backBtn.enlargeSize = CGSizeMake(20, 20);
[container addSubview:backBtn];
LxButton *closeBtn = [LxButton LXButtonWithTitle:nil titleFont:nil Image:[UIImage imageNamed:@"LX_close"] backgroundImage:nil backgroundColor:nil titleColor:nil frame:CGRectMake(50, 14, 25, 25)];
closeBtn.enlargeSize = CGSizeMake(20, 20);
[container addSubview:closeBtn];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:container];
WS(weakSelf);
[backBtn addClickBlock:^(UIButton *button) {
if (_webView.canGoBack) {
[_webView goBack];
} else {
if (weakSelf.isPresent) {
[self.navigationController dismissViewControllerAnimated:YES completion:nil];
} else {
[self.navigationController popViewControllerAnimated:YES];
}
}
}];
[closeBtn addClickBlock:^(UIButton *button) {
if (weakSelf.isPresent) {
[self.navigationController dismissViewControllerAnimated:YES completion:nil];
} else {
[self.navigationController popViewControllerAnimated:YES];
}
}];
}
-(void)responData{
[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:self.url]]];
}
-(void)setup{
[self.view addSubview:self.webView];
[self.view addSubview:self.progressView];
}
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
// js 里面的alert实现，如果不实现，网页的alert函数无效
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message
message:nil
preferredStyle:UIAlertControllerStyleAlert];
[alertController addAction:[UIAlertAction actionWithTitle:@"确定"
style:UIAlertActionStyleCancel
handler:^(UIAlertAction *action) {
completionHandler();
}]];
[self presentViewController:alertController animated:YES completion:^{}];
}
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {
// js 里面的alert实现，如果不实现，网页的alert函数无效 ,
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message
message:nil
preferredStyle:UIAlertControllerStyleAlert];
[alertController addAction:[UIAlertAction actionWithTitle:@"确定"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action) {
completionHandler(YES);
}]];
[alertController addAction:[UIAlertAction actionWithTitle:@"取消"
style:UIAlertActionStyleCancel
handler:^(UIAlertAction *action){
completionHandler(NO);
}]];
[self presentViewController:alertController animated:YES completion:^{}];
}
#pragma KVO
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context
{
if ([keyPath isEqualToString:@"estimatedProgress"]) {
double progress = self.webView.estimatedProgress;
self.progressView.progress = progress;
}
}
-(WKWebView *)webView{
if (!_webView) {
_webView = [[WKWebView alloc]initWithFrame:self.view.bounds];
_webView.UIDelegate = self;
_webView.navigationDelegate = self;
_webView.backgroundColor = [UIColor whiteColor];
_webView.allowsBackForwardNavigationGestures = YES;
_webView.configuration.allowsInlineMediaPlayback = YES;
[_webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:nil];
}
return _webView;
}
-(LXWebViewProgressView *)progressView{
if (!_progressView) {
CGFloat ProgressY = 0;
if (self.navigationController.navigationBar && !self.navigationController.navigationBar.hidden) {
ProgressY = 64;
}
_progressView =[[LXWebViewProgressView alloc]initWithFrame:CGRectMake(0, ProgressY, CGRectGetWidth(self.view.frame), 2.5)];
_progressView.progress = 0.00;
}
return _progressView;
}
-(void)dealloc{
[self.webView removeObserver:self forKeyPath:@"estimatedProgress"];
}
@end
效果图
2018-02-11 18_12_21.gif
demo地址：基于WKWebView的进度导航
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