1.导入头文件
#import <WebKit/WebKit.h>
2.创建WKWebView和ProcessView, 并且添加观察者,代理WKUIDelegate,WKNavigationDelegate
@property (strong, nonatomic) WKWebView *webView;
@property (strong, nonatomic) UIProgressView *progressView;
- (void)viewDidLoad {
[super viewDidLoad];
self.webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
self.webView.UIDelegate = self;
self.webView.navigationDelegate = self;
[self.view addSubview:self.webView];
self.progressView = [[UIProgressView alloc]initWithFrame:CGRectMake(0, 64, CGRectGetWidth(self.view.frame),2)];
[self.view addSubview:self.progressView];
[self.webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew| NSKeyValueObservingOptionOld context:nil];
[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]]];
}
3. 实现代理方法
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary*)change context:(void *)context
{
if ([keyPath isEqual: @"estimatedProgress"] && object == self.webView) {
[self.progressView setAlpha:1.0f];
[self.progressView setProgress:self.webView.estimatedProgress animated:YES];
if(self.webView.estimatedProgress >= 1.0f)
{
[UIView animateWithDuration:0.3 delay:0.3 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];
}
}
4.移除观察者
- (void)dealloc {
[self.webView removeObserver:self forKeyPath:@"estimatedProgress"];
[self.webView setNavigationDelegate:nil];
[self.webView setUIDelegate:nil];
}
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