ios开发之--给WebView加载进度条

// 获取屏幕 宽度、高度 bounds就是屏幕的全部区域
#define KDeviceWidth [UIScreen mainScreen].bounds.size.width
#define KDeviceHeight [UIScreen mainScreen].bounds.size.height#define IS_IPHONE_X (KDeviceHeight == 812.0f) ? YES : NO#define Height_NavBar ((IS_IPHONE_X) ? 88.0f : 64.0f)#define Height_NavContentBar 64.0f#import "OtherViewController.h"@interface OtherViewController ()<WKUIDelegate,WKNavigationDelegate>@property (nonatomic, strong) WKWebViewConfiguration *wkConfig;
/*
*1.添加UIProgressView属性
*/
@property (nonatomic, strong) UIProgressView *progressView;@property (nonatomic, strong) WKWebView *wkWebView;@end@implementation OtherViewController#pragma mark - 初始化wkWebView- (WKWebViewConfiguration *)wkConfig {
if (!_wkConfig) {
_wkConfig = [[WKWebViewConfiguration alloc] init];
_wkConfig.allowsInlineMediaPlayback = YES;
if (@available(iOS 10.0, *)) {
_wkConfig.allowsPictureInPictureMediaPlayback = YES;
} else {
// Fallback on earlier versions
}
}
return _wkConfig;
}- (WKWebView *)wkWebView {
if (!_wkWebView) {
_wkWebView = [[WKWebView alloc] initWithFrame:CGRectMake(, Height_NavBar, KDeviceWidth, KDeviceHeight) configuration:self.wkConfig];
_wkWebView.navigationDelegate = self;
_wkWebView.UIDelegate = self;
[self.view addSubview:_wkWebView];
}
return _wkWebView;
}/*
*6.在dealloc中取消监听
*/- (void)dealloc {
if (self.progressView) {
[self.progressView removeFromSuperview];
self.progressView = nil;
}
[self.wkWebView removeObserver:self forKeyPath:@"estimatedProgress"];
}- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view. /*
*2.初始化progressView
*/
self.progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(, , [[UIScreen mainScreen] bounds].size.width, )];
self.progressView.backgroundColor = [UIColor whiteColor];
self.progressView.progressImage = [UIImage imageNamed:@"WKProgress"];
//设置进度条的高度，下面这句代码表示进度条的宽度变为原来的1倍，高度变为原来的1.5倍.
self.progressView.transform = CGAffineTransformMakeScale(1.0f, 1.5f);
// [self.navigationController.navigationBar addSubview:self.progressView];
[self.navigationController.navigationBar addSubview:self.progressView];
/*
*3.添加KVO，WKWebView有一个属性estimatedProgress，就是当前网页加载的进度，所以监听这个属性。
*/
[self.wkWebView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil]; [self loadWebViewWithUrl:@"http://www.pc6.com/apple/"];
}- (void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
[self.progressView removeFromSuperview];
self.progressView = nil;
}#pragma mark - start load web- (void)loadWebViewWithUrl:(NSString *)url{
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
request.timeoutInterval = 15.0f;
[self.wkWebView loadRequest:request];
}#pragma mark - 监听/*
*4.在监听方法中获取网页加载的进度，并将进度赋给progressView.progress
*/- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context {
if ([keyPath isEqualToString:@"estimatedProgress"]) {
NSLog(@"%.2f,",self.wkWebView.estimatedProgress);
self.progressView.progress = self.wkWebView.estimatedProgress;
if (self.progressView.progress == ) {
/*
*添加一个简单的动画，将progressView的Height变为1.4倍
*动画时长0.25s，延时0.3s后开始动画
*动画结束后将progressView隐藏
*/
__weak typeof (self)weakSelf = self;
[UIView animateWithDuration:0.25f delay:0.3f options:UIViewAnimationOptionCurveEaseOut animations:^{
weakSelf.progressView.transform = CGAffineTransformMakeScale(1.0f, 1.4f);
} completion:^(BOOL finished) {
weakSelf.progressView.hidden = YES; }];
}
}else{
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}#pragma mark - WKWKNavigationDelegate Methods/*
*5.在WKWebViewd的代理中展示进度条，加载完成后隐藏进度条
*///开始加载
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
NSLog(@"开始加载网页");
//开始加载网页时展示出progressView
self.progressView.hidden = NO;
//开始加载网页的时候将progressView的Height恢复为1.5倍
self.progressView.transform = CGAffineTransformMakeScale(1.0f, 1.5f);
//防止progressView被网页挡住
[self.navigationController.navigationBar bringSubviewToFront:self.progressView];
}//加载完成
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
NSLog(@"加载完成");
//加载完成后隐藏progressView
// self.progressView.hidden = YES;
}//加载失败
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error {
NSLog(@"加载失败");
//加载失败同样需要隐藏progressView
self.progressView.hidden = YES;
}//页面跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
//允许页面跳转
NSLog(@"%@",navigationAction.request.URL);
decisionHandler(WKNavigationActionPolicyAllow);
}