我正在尝试在WKWebView中实现估计进度,但似乎无法弄清楚.你能帮我吗？
这就是我所得到的：
self.view = self.webView; NSURL *url = [NSURL URLWithString:stringWeb]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init]; self.webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:configuration]; [self.webView loadRequest:request];
我看到这个答案有一点,但这是一个微调：UIWebView with Progress Bar
苹果公司记录了一些估计的进度(我假设它的导航栏下方的蓝色条,显示了Safari中的进度),但是我一般不会看到如何实现：https://developer.apple.com/library/ios/documentation/WebKit/Reference/WKWebView_Ref/#//apple_ref/occ/instp/WKWebView/estimatedProgress
所以我被困在这里任何帮助将不胜感激,谢谢！
更新：这是我现在所拥有的.因为看起来像我的进度视图和WKWebView正在加载两次,因为崩溃,我不知道为什么会这样.得到观察者需要删除的错误.这是我的代码,
ViewController.h
@interface WebPageViewController : UIViewController <UIWebViewDelegate> @property (strong,nonatomic) Nsstring *stringMobile; @property (strong,nonatomic) Nsstring *stringWeb; @property (strong,nonatomic) IBOutlet UIView *view; @property (nonatomic,strong) WKWebView *webView; @property (nonatomic) UIProgressView *progressView;
ViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:self.webView];
[self.webView addobserver:self forKeyPath:@"estimatedProgress" options:NSkeyvalueObservingOptionNew context:NULL];
self.progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
self.progressView.center = self.view.center;
[self.view addSubview:self.progressView];
NSURLRequest *URLRequest = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:stringWeb]];
[self.webView loadRequest:URLRequest];
}
- (void)dealloc {
[self.webView removeObserver:self forKeyPath:@"estimatedProgress"];
// if you have set either WKWebView delegate also set these to nil here
[self.webView setNavigationDelegate:nil];
[self.webView setUIDelegate:nil];
}
- (void)observeValueForKeyPath:(Nsstring *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if ([keyPath isEqualToString:@"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];
}
}
更新：使用CocoaPods这是我所拥有的,但它显示两个视图而不是一个webview
- (void)viewDidLoad {
[super viewDidLoad];
NSURL *myURL = [NSURL URLWithString: [self.url stringByAddingPercentEscapesUsingEncoding:
NSUTF8StringEncoding]];
NSURLRequest *request = [NSURLRequest requestWithURL:myURL];
//[self.webView loadRequest:request];
// KIN
// Deleted UIWebView in Storyboard
KINWebbrowserViewController *webbrowser = [[KINWebbrowserViewController alloc] init];
[self.navigationController pushViewController:webbrowser animated:YES];
[webbrowser loadURL:myURL];
}
解决方法
在GitHub上查看
KINWebBrowser,查看下面解决方案的全面实现.
如果您仔细查看WKWebView的估计Progress属性的文档,您链接到的文档将会显示：
The WKWebView class is key-value observing (KVO) compliant for this property.
这意味着您可以在estimateProgress属性上设置键值观察以观察其值的更改.从observeValueForKeyPath方法可以更新您的UI.
可可的KVO设计模式是相当凌乱的.看看这个优秀的NSHipster有关Key Value Observing最佳实践的文章.
以下是WKWebView上估计的进度的KVO实现：
从您的UIViewController,设置您的WKWebView并添加自己作为estimatedProgress的观察者
self.webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:self.webView];
[self.webView addobserver:self forKeyPath:NsstringFromSelector(@selector(estimatedProgress)) options:NSkeyvalueObservingOptionNew context:NULL];
在同一个UIViewController中,设置observeValueForKeyPath方法来过滤掉webView的estimateProgress属性.然后,您可以直接访问estimateProgress值,并相应地更新您的UI.
- (void)observeValueForKeyPath:(Nsstring *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if ([keyPath isEqualToString:NsstringFromSelector(@selector(estimatedProgress))] && object == self.webView) { NSLog(@"%f",self.webView.estimatedProgress); // estimatedProgress is a value from 0.0 to 1.0 // Update your UI here accordingly } else { // Make sure to call the superclass's implementation in the else block in case it is also implementing KVO [super observeValueForKeyPath:keyPath ofObject:object change:change context:context]; } }
确保在UIViewController的dealloc方法中从UIViewController中删除KVO.如果观察者尚未添加,请检查isViewLoaded是否避免崩溃是非常重要的.
- (void)dealloc {
if ([self isViewLoaded]) {
[self.wkWebView removeObserver:self forKeyPath:NsstringFromSelector(@selector(estimatedProgress))];
}
// if you have set either WKWebView delegate also set these to nil here
[self.wkWebView setNavigationDelegate:nil];
[self.wkWebView setUIDelegate:nil];
}
要看这个在一些大文件的行动,加载这个甜蜜的星系的巨大的图像文件. (这个文件是35MB,确保你在WiFi上！)
NSURLRequest *URLRequest = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.spacetelescope.org/static/archives/images/large/opo0328a.jpg"]]; [self.webView loadRequest:URLRequest];
如果您正在使用UIProgressView,您可以使用此代码实现一个诸如淡出效果的Safari：
- (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]; [self.progressView setProgress:self.wkWebView.estimatedProgress animated:YES]; if(self.wkWebView.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]; } }
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