WKWebView載入進度條
阿新 • • 發佈:2019-02-11
一、建立WKWebView和進度條
@property (nonatomic, strong) WKWebView *webView;
@property (nonatomic, strong) UIProgressView *progressView;
二、初始化UI
- (void)setupUI
{
self.webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height - D_TabbarSafeBottomMargin)];
[self.view addSubview:self.webView];
self.progressView = [[UIProgressView alloc] initWithProgressViewStyle:(UIProgressViewStyleDefault)];
self.progressView.frame = CGRectMake(0, 0, self.webView.frame.size.width, 2);
self.progressView.trackTintColor = [UIColor clearColor];
self.progressView .progressTintColor = [UIColor colorWithRed:75/255.0 green:181/255.0 blue:247/255.0 alpha:1.0];
[self.progressView setProgress:0.1 animated:YES];
[self.webView addSubview:self.progressView];
}
三、註冊和移除觀察者
- (void)_registerObserver
{
[self.webView addObserver:self forKeyPath:@"estimatedProgress" options:(NSKeyValueObservingOptionNew) context:nil];
[self.webView addObserver:self forKeyPath:@"title" options:(NSKeyValueObservingOptionNew) context:nil];
}
- (void)_removeObserver
{
[self.webView removeObserver:self forKeyPath:@"estimatedProgress"];
[self.webView removeObserver:self forKeyPath:@"title"];
}
四、載入連結這裡我們以百度為例
- (void)loadRequest
{
NSURL *url = [NSURL URLWithString:@"http:www.baidu.com"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
}
五、實現觀察方法
/**
觀察屬性變化
@param keyPath 被觀察的屬性
@param object 被觀察屬性的物件
@param change 被觀察屬性的值的包括舊值和新值
@param context 上下文
*/
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context
{
if ([object isEqual:self.webView] && [keyPath isEqualToString:@"estimatedProgress"]) {
CGFloat newprogress = [[change objectForKey:NSKeyValueChangeNewKey] floatValue];
if (newprogress >= 0.999) {
[self.progressView setProgress:1.0 animated:YES];
__weak typeof(self) weakSelf = self;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
//防止weakSelf指標為nil造成閃退
__strong typeof(weakSelf) strongSelf = weakSelf;
strongSelf.progressView.hidden = YES;
[strongSelf.progressView setProgress:0 animated:NO];
});
} else {
self.progressView.hidden = NO;
[self.progressView setProgress:newprogress animated:YES];
}
}else if ([object isEqual:self.webView] && [keyPath isEqualToString:@"title"]) {
self.title = (NSString *)[change objectForKey:NSKeyValueChangeNewKey];
}
}
六、載入viewDidLoad函式
- (void)viewDidLoad {
self.isRefresh = NO;
self.edgesForExtendedLayout = UIRectEdgeNone;
[self setTitle:LocalizedBlueOfficeForKey(@"載入web")];
[self setupUI];
[self _registerObserver];
[self loadRequest];
}
7、在dealloc中移除觀察者
- (void)dealloc
{
[self _removeObserver];
[self _removeNotifacation];
}
總結:通過上述可以實現微信一樣的載入web有進度條顯示的效果,如果有其他要求可以在WKWebView的代理中進行處理