1、由于项目中加载网络插件，直接使用了webview加载。使用了三方NJKWebViewProgress进度条的使用，近期在测试时发现，网络缓慢时出现白屏，有卡顿现象。
于是采用了WKWebView进行加载，KVO监听下载进度
// ViewController.m #import "ViewController.h" #import <WebKit/WebKit.h>
#import <WebKit/WKWebView.h> #define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)
#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height) #define IPHONEHIGHT(b) [UIScreen mainScreen].bounds.size.height*((b)/1334.0)
#define IPHONEWIDTH(a) [UIScreen mainScreen].bounds.size.width*((a)/750.0) static void *WkwebBrowserContext = &WkwebBrowserContext;
@interface ViewController ()<WKNavigationDelegate,WKUIDelegate,WKScriptMessageHandler,UINavigationControllerDelegate,UINavigationBarDelegate>
{
UIButton * back;
UILabel * labeltitle;//webview显示前的title }
@property (nonatomic, strong) WKWebView *wkWebView;
//设置加载进度条
@property (nonatomic,strong) UIProgressView *progressView;
@end @implementation ViewController -(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated]; self.tabBarController.tabBar.hidden = YES;
self.navigationController.navigationBar.hidden= NO;
[[UIApplication sharedApplication]setStatusBarHidden:YES]; }
-(void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
self.tabBarController.tabBar.hidden = NO;
self.navigationController.navigationBar.hidden= NO;
[[UIApplication sharedApplication]setStatusBarHidden:NO]; [self.wkWebView.configuration.userContentController removeScriptMessageHandlerForName:@"WXPay"];
[self.wkWebView setNavigationDelegate:nil];
[self.wkWebView setUIDelegate:nil]; //清除缓存
[[NSURLCache sharedURLCache] removeCachedResponseForRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:
@"https://www.baidu.com"]]]; } - (void)viewDidLoad { [super viewDidLoad]; [self CreatUI]; }
-(void)CreatUI{ self.view.backgroundColor = [UIColor blackColor];
[self.wkWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.baidu.com"]]]; //添加到主控制器上 [self.view addSubview:self.wkWebView];
//添加进度条
[self.view addSubview:self.progressView];
//
// back = [myButton buttonWithType:UIButtonTypeCustom frame:CGRectMake(ScreenWidth-IPHONEWIDTH(120), ScreenHeight-IPHONEHIGHT(100), IPHONEWIDTH(50), IPHONEHIGHT(50)) tag:1 image:@"ic_history_ct_return" andBlock:^(myButton *button) {
//
// [self.navigationController popViewControllerAnimated:YES];
//
//
// }];
//
// [self.view addSubview:back];
// labeltitle = [[UILabel alloc] initWithFrame:CGRectMake(, IPHONEHIGHT(), self.view.bounds.size.width, IPHONEHIGHT())];
//设置成绿色
labeltitle.backgroundColor = [UIColor blackColor];
labeltitle.text =@"Title"; labeltitle.textColor = [UIColor whiteColor];
labeltitle.font = [UIFont boldSystemFontOfSize:IPHONEHIGHT()];
labeltitle.textAlignment = NSTextAlignmentCenter; [self.view addSubview:labeltitle]; // [MBProgressHUD showHUDAddedTo:self.view animated:YES]; } #pragma mark ================ WKNavigationDelegate ================ //这个是网页加载完成，导航的变化
-(void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
[labeltitle removeFromSuperview];
// [MBProgressHUD hideHUDForView:self.view animated:YES];
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO]; } //开始加载
-(void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation{
//开始加载的时候，让加载进度条显示
self.progressView.hidden = NO; } //内容返回时调用
-(void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation{} //服务器请求跳转的时候调用
-(void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation{} // 内容加载失败时候调用
-(void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error{
NSLog(@"页面加载超时");
// [MBProgressHUD hideHUDForView:self.view animated:YES]; // [MBProgressHUD showText:@"加载失败，请重试" HUDAddedTo:self.view animated:YES afterDelay:1.5];
} //跳转失败的时候调用
-(void)webView:(WKWebView *)webView didFailNavigation:(WKNavigation *)navigation withError:(NSError *)error{} //进度条
-(void)webViewWebContentProcessDidTerminate:(WKWebView *)webView{} //KVO监听进度条
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if ([keyPath isEqualToString:NSStringFromSelector(@selector(estimatedProgress))] && object == self.wkWebView) {
[self.progressView setAlpha:1.0f];
BOOL animated = self.wkWebView.estimatedProgress > self.progressView.progress;
[self.progressView setProgress:self.wkWebView.estimatedProgress animated:animated]; // Once complete, fade out UIProgressView
if(self.wkWebView.estimatedProgress >= 1.0f) {
[UIView animateWithDuration:0.3f delay:0.3f options:UIViewAnimationOptionCurveEaseOut animations:^{
[self.progressView setAlpha:0.0f];
} completion:^(BOOL finished) {
[self.progressView setProgress:0.0f animated:NO];
}];
}
}
else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
} #pragma mark ================ 懒加载 ================ - (WKWebView *)wkWebView{
if (!_wkWebView) {
//设置网页的配置文件
WKWebViewConfiguration * Configuration = [[WKWebViewConfiguration alloc]init];
//允许视频播放
Configuration.allowsAirPlayForMediaPlayback = YES;
// 允许在线播放
Configuration.allowsInlineMediaPlayback = YES;
// 允许可以与网页交互，选择视图
Configuration.selectionGranularity = YES;
// web内容处理池
Configuration.processPool = [[WKProcessPool alloc] init];
//自定义配置,一般用于 js调用oc方法(OC拦截URL中的数据做自定义操作)
WKUserContentController * UserContentController = [[WKUserContentController alloc]init];
// 添加消息处理，注意：self指代的对象需要遵守WKScriptMessageHandler协议，结束时需要移除
[UserContentController addScriptMessageHandler:self name:@"WXPay"];
// 是否支持记忆读取
Configuration.suppressesIncrementalRendering = YES;
// 允许用户更改网页的设置
Configuration.userContentController = UserContentController;
_wkWebView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:Configuration];
_wkWebView.backgroundColor = [UIColor blackColor];
// 设置代理
_wkWebView.navigationDelegate = self;
_wkWebView.UIDelegate = self;
//kvo 添加进度监控
[_wkWebView addObserver:self forKeyPath:NSStringFromSelector(@selector(estimatedProgress)) options: context:WkwebBrowserContext];
//开启手势触摸
_wkWebView.allowsBackForwardNavigationGestures = YES;
// 设置 可以前进 和 后退
//适应你设定的尺寸
[_wkWebView sizeToFit];
}
return _wkWebView;
} - (UIProgressView *)progressView{
if (!_progressView) {
_progressView = [[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleDefault]; _progressView.frame = CGRectMake(, IPHONEHIGHT(), self.view.bounds.size.width, IPHONEHIGHT()); // 设置进度条的色彩
[_progressView setTrackTintColor:[UIColor colorWithRed:240.0/ green:240.0/ blue:240.0/ alpha:1.0]];
_progressView.progressTintColor = [UIColor greenColor];
}
return _progressView;
} //注意，观察的移除
-(void)dealloc{
[self.wkWebView removeObserver:self forKeyPath:NSStringFromSelector(@selector(estimatedProgress))];
} @end
不建议采用下方代码，会在网络缓慢时有白屏现象
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1/拖到自己的